ESTATE MON BIJOU 
ST. CROIX, VIRGIN ISLANDS 
FINAL 
DETAILED PROJECT REPORT 
AND 
ENVIRONMENTAL ASSESSMENT 
SECTION 205 
FLOOD CONTROL 
US Army Corps 
of Engineers 
Jacksonville District 
South Atlantic Divisicfl 
FINAL 
DETAILED PROJECT REPORT 
AND 
ENVIRONMENTAL ASSESSMENT 
FOR 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
DECEMBER 1987 
ESTATE MON BIJOU/GLYNN 
ST. CROIX. U.S. VIRGIN ISLANDS 
SECTION 205 
DETAILED PROJECT REPORT 
SYLLABUS 
The purpose of this study is to determine the feasibility of reducing 
flood damages and related problems in the Estate Mon Bijou and Glynn resi-
dential areas of the island of St. Croix in the U.S. Virgin Islands. This 
study was conducted at the request of the Department of Public Works for the 
U.S. Virgin Islands. 
The report was prepared under the authority provided 
in Section 205 of the 1948 Flood Control Act. as amended. 
The u.s. Army 
Corps of Engineers has primary responsibility for conducting the study and 
preparing this report. 
The Mon Bijou and Glynn residential areas are located in the upper part 
of the Salt River watershed about 5 miles west of the city of Christiansted. 
St. Croix. 
A tributary to the Salt River. Canaan Gut. originates on the 
south slopes of the northern coastal mountain range of St. Croix. 
Canaan 
Gut drains the southern slopes of Blue Mountain and Mount Eagle before 
entering the Mon Bijou area at the base of the mountains. It travels 
through the Mon Bijou and Glynn areas before joining with another tributary 
to form the Salt River just below Glynn. 
The total drainage area of Canaan 
Gut is 2.5 square miles. of which only 0.87 square miles lie above the Mon 
Bijou area. However. due to heavy rainfall generated by the mountains and 
the steep slopes. flood flows are substantial with a 100-year flood flow of 
over 3.200 cubic feet per second (cfs) where Canaan Gut enters Mon Bijou. 
This combined with severe encroachment of the flood plain of the normally 
dry stream. has resulted in 96 homes being subject to flooding by a 100-year 
event. This would result in over $1.7 million in damages and related flood 
losses. 
Even a 2-year event produces over $340.000 in damages. 
Total 
average annual damages are estimated at $442.150. 
During the period 
1975-1980. three major floods occurred in the area which caused widespread 
damage. 
To address these flood problems. several plans were developed and eval-
uated to determine their effectiveness in reducing flooding and their 
overall economic. environmental. social. and other impacts. 
As a result of 
the investigations performed. a plan was developed which provides for the 
construction of a bypass channel around the developed portions of Mon Bijou 
and Glynn. 
This plan involves the construction of a grass-lined channel 
about 6.500 feet long. 
At the upstream end. a levee is included to help 
divert flows into the new channel. 
To control flow velocities in the chan-
nel. thirty-four gabion-lined drop structures would be required. 
Additionally. two new bridges would be built to span the new channel. 
In 
all this plan would cost $3.6 million initially. or $338.000 annually. 
Annual benefits are estimated at $415.600. 
The benefit-cost ratio would be 
1.2. 
Based on an analysis of overall economic. environmental. and social 
impacts, the above plan was found to be in the Federal interest and 
justified for implementation. Therefore. the plan is recommended for 
approval for Federal construction. 
--:·· 
DETAILED PROJECT REPORT AND ENVIRONMENTAL ASSESSMENT 
ESTATE MOM BIJOU 
ST. CROIX. u.s. VIRGIN ISLANDS 
TABLE OF CONTENTS 
Title 
Study Authority 
Study Purpose and Scope 
Prior Studies and Reports 
Study Participants 
Plan Formulation 
Study Area Description 
Existing Conditions 
· 
Future Conditions 
Problems. Needs. and Opportunities 
Planning Objectives 
Planning Constraints 
Possible Measures 
Initial Screening 
Alternative Plans 
Initial Evaluation 
Detailed Plans 
Assessment and Evaluation 
Trade-off Analysis 
Identification of NED Plan 
Plan Selection -
The Selected Plan 
Plan Description 
Design and Construction 
Operation and Maintenance 
Accompli sl'unents 
Cultural Resources 
Mitigation Requirements 
Other Considerations 
TC-1 
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Rev 04/21/88 
TABLE OF CONTENTS - Cont'd 
Title 
Plan Implementation 
Institutional Requirements 
Division of Responsibilities and Cost-Sharing 
Public Involvement 
Conclusions 
Recommendations 
Findings of No Significant Impact 
Environmental Assessment 
TC-2 
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LIST OF TABLES 
Title 
St. Croix Population 
Flood Plain Evacuation 
Channel Modi fica ti on Plans 
Channel Bypass Plans 
Summary Comparison of Detailed 
Plans 
Proposed Plan Cost Estimate 
Cost Sharing 
LIST OF PLATES 
Title 
Study Area 
Selected Plan 
Plan Details 
Design Condition Profile 
Existing Condition-Flooded Area 
Pa~e No. 
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With-Project Condition-Flooded Area 
Non-Structural Alternative 
Concrete Culvert Alternative 
Open Channel Upper End - Alternative 
Cultural Resources 
TC-3 
APPENDIXES 
Appendix A -
Hydrology and Hydraulics 
. 
Appendix B 
Geotechnical and Materials 
Appendix c 
Recreation 
Appendix D 
Engineering, Design, and Cost Estimates 
Appendix E -
Economic Analysis 
Appendix F -
Cultural Resources 
• 
Appendix G 
Local Cooperation and Public Involvement 
TC-4 
DETAILED PROJECT REPORT 
ON 
ESTATE MON BIJOU/GLYNN 
ST. CROIX, U. S. VIRGIN ISLANDS 
This report presents the results of investigations into flooding and 
related problems for the Estate Mon Bijou/Glynn areas of St. Croix in the 
U. S. Virgin Islands. 
The report was prepared in response to a request by 
the Department of Public Works, Virgin Islands, for assistance in reducing 
flooding in the Mon Bijou area. This area is a residential suburb of 
Christiansted and is subject to frequent and severe flooding. 
STUDY AUTHORITY 
This report was prepared under the authority provided by Section 205 of 
the 1948 Flood Control Act, as amended. Section 205 authorizes the Chief of 
Engineers to investigate and construct, within certain cost limitations, 
small projects for flood control when such work is found advisable. 
The 
advisability of constructing a project under this program is dependent upon 
a detailed investigation of the engineering, economic, and environmental 
aspects of the area and a determination of the Federal interest in such 
work. 
In general, a project must be in the overall public interest, 
complete within itself, engineeringly feasible, economically justified, and 
environmentally sound in order to be included in this program. 
Also, there 
is a limitation, currently $5 million, on the amount that the Federal 
Government can contribute to any one project. 
All costs in excess of that 
amount, as well as certain other costs, must be borne by local interests. 
STUDY PURPOSE AND SCOPE 
The primary purpose of this study is to investigate flooding and 
related problems in the Mon Bijou area, determine if feasible means for 
reducing these problems exist, and recommend the most appropriate course of 
action. 
In this regard, investigations were conducted in accordance with 
the procedures contained in the Water Resource Council's .. Economic and 
Environmental Principles and Guidelines for Water and Related Land Resources 
Implementation Study" (48FR10259). 
Because of the inherent limitations of 
the Section 205 program, studies were generally confined to the immediate 
study area of Mon Bijou. 
However, the investigations were of sufficient 
detail to identify those problems being experienced, determine probable 
future changes, identify and evaluate possible plans for addressing these 
problems, develop detailed plans for possible implementation, determine 
public support for such plans, and recommend a course of action as 
appropriate. 
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PRIOR STUDIES AND REPORTS 
Several studies have been conducted regarding flooding and related 
problems in the Mon Bijou area. 
The primary reports applicable to this 
study are: 
a. 
Reconnaissance Report of the Estate Mon Bijou, dated May 1980, 
prepared by the Jacksonville District, U. S. Army Corps of Engineers. 
This 
report was a prelude to this investigation and identified flood problems in 
the area as well as a need for further study. 
b. 
Post Disaster Report for Virgin Islands, dated 10 January 1978, 
prepared by the Jacksonville District to document the flooding and damage 
that resulted from a tropical wave (atmospheric condition) on 7-8 October 
1977. 
This document identified significant flooding and damage in the Mon 
Bijou and Glynn areas. 
c. 
Cultural Resources Survey: Mon Bijou Project, St. Croix, V.I., 
dated 17 January 1984, prepared under contract to Jacksonville District to 
document the cultural resources in the study area as a part of this overall 
investigation. 
A summary of this report is contained in Appendix H. 
d. 
Flood Insurance Study U.S. Virgin Islands, Island of St. Croix, 
dated April 1980, prepared by the Federal Emergency Management Agency to 
identify flood-prone areas and establish various zones for flood insurance 
purposes. 
e. 
A Flood Damage Mitigation Plan for the U. S. Virgin Islands, 
dated June 1979, prepared by CH2M Hill Engineering to identify flood 
problems in the Virgin Islands and present possible solutions to these 
problems. 
STUDY PARTICIPANTS 
The Jacksonville District was 
t~e lead agency in the preparation of 
this report. 
Valuable information and assistance was provided by the 
Department of Public Works of the U. S. Virgin Islands, the State Historic 
Preservation Officer, the U. S. Fish and Wildlife Service, and other local 
and Federal agencies. 
PLAN FORMULATION 
STUDY AREA DESCRIPTION 
The primary study area is the Estate Mon Bijou and Glynn residential 
area which is located in the upper part of the Salt River watershed about 5 
miles west of Christiansted. 
Christiansted is located on the north central 
coast of the island of St. Croix. 
This island is a part of the U. S. Virgin 
Island Territories and is located about 1200 miles southeast of Miamt, 
Florida and 80 miles southeast of San Juan, Puerto Rico (see plate 1). 
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I 
The Mon Bijou/Glynn area is a suburban residential area consisting of 
medium density, single family units located at the foot of Blue Mountain and 
Mount Eagle. It is drained by the Canaan Gut tributary of the Salt River. 
The drainage .basin of Canaan Gut covers about 2.5 square miles of which 0.87 
square miles lie above the residential development. 
The terrain is very 
steep above the Mon Bijou area with elevations ranging from the Blue 
Mountain peak of 1165 feet above National Geodetic Vertical Datum (NVGD) to 
200 feet NGVD at the upper end of Mon Bijou. 
Within the Mon Bijou area ele-
vations range from 80 feet NGVD to 200 feet NGVD. 
A second tributary, 
Little Fountain Gut, drains into Canaan Gut from the east. It joins Canaan 
Gut just downstream from the start of Mon Bijou. Both streams are normally 
dry discharging only as a direct result of rainfall. 
EXISTING CONDITIONS 
The island of St. Croix is the largest of the 50 islands and cays that 
make up the Territory of the U.S. Virgirr Islands. It is 23 miles long and 1 
to 6 miles wide. 
In all, it provides about 80 square miles of land area. 
These islands are part of the Caribbean Island chain that stretches from 
just east of the Florida coast to just east of the northeastern tip of South 
America. 
This string of islands form the boundary between the Atlantic 
Ocean and the Caribbean Sea. 
St. Croix is typical of these subtropical. islands displaying a sharply 
varying terrain and a very warm climate. It has a low mountain range that 
forms a spine along its length, a large coastal plain on its south shore and 
numerous smaller flat areas. 
The geological composition of the island 
primarily reflects its volcanic orgin in the ocean environment. It is 
characterized by a volcanic or limestone base overlain by alluvial clay, 
marl, and decomposed limestone. 
The Canaan Gut drainage basin displays this 
typical topographical and geological makeup with the upper basin having 
steep slopes of 35 percent and a relatively thin layer of clayey overburden 
with the volcanic base. This rapidly gives way to a deeper, more varied 
overburden as the slopes decrease at the Mon Bijou area and the alluvial fan 
develops. 
Top soils in this area are generally characterized as a clay loam 
of varying composition. 
The climate of the area is classified as subtropical with warm 
temperatures that range from a minimum of 67 degrees Fahrenheit to a maximum 
of 97 degrees. 
The mean annual temperature is 78.3 degrees. 
Despite the 
relatively warm climate and island setting, average annual rainfall is only 
45.7 inches and varies widely from year to year. This is apparently due to 
the small size of the island which is not conducive to generating rainfall. 
Rainfall patterns also vary within the year with the largest amounts being 
received during September - December and the smallest amounts during 
February- March. 
This reflects the influence of tropical waves and 
disturbances on the island which occur primarily during the latter part of 
the year. 
On the island the distribution of rainfall varies significantly 
with the mountainous northern area and western end receiving the majority of 
the rain. Rainfall in the Mon Bijou area tends to be heavier than much of 
the rest of the island due to the proximity of the mountains. 
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As a result of the steep terrain and widely varying rainfall, 
vegetation in the study area tends to reflect a more drought resistant 
composition. 
The mountains with their steep slopes and heavier rainfall are 
covered with decidous and evergreen trees. 
These rapidly give way to upland 
grasses, thorn scrubs, and other drought resistant species at the Mon Bijou 
area. 
The only significant wetland area is located some distance away at 
the mouth of Salt River. 
Wildlife in the area is very limited, consisting of small birds and 
animals. 
There are no criticl habitats or species listed or proposed for 
listing in the primary study area. 
Two endangered species which may occur 
in the general area include the St. Croix ground lizard and the Virgin 
Islands tree boa. 
Land use in the Canaan Gut drainage basin is governed by the two very 
distinct topographical areas. 
The upper part of the basin with very steep 
terrain is sparsely developed and covered with natural vegetation. 
The 
lower part of the basin, beginning at Mon Bijou, is considerably less 
sloping which has allowed development of the area into residential and 
agricultural use. 
While agricultural use has been present since early 
settlement of the islands, the residential development has resulted from the 
more recent urban growth of the Christiansted area. 
Historically, the economy of St. Croix was based on the production of 
sugarcane and the transhipment of goods. 
However, these both declined in 
importance during the 1800's with accompanying decline in the economy and 
decrease in island population. 
Developmental pressures remained absent 
until 1930 when sugarcane reemerged as an important crop. 
However, it was 
not until 1960 that significant growth took place. 
During the period from 
1960-1970 the population doubled and the economy turned to tourism as a 
major activity. This was accompanied by an expanding divergence in the 
economy with an increase in commercial and industrial activity. 
The result 
of this expansion and population increase was urban sprawl which fostered 
the development of suburban communities for the rising middle class. 
Table 1 provides information on the historical and projected population of 
St. Croix. 
Year 
1970 
1975 
1980 
1990 
2000 
2010 
2020 
2030 
TABLE 1 
ST. CROIX POPULATION 
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Population 
35,945 
36,131 
49,725 
52,260 
54,926 
57,727 
60,670 
63,763 
The Mon Bijou area is a typical example of the economic activity on St. 
Croix. 
It is primarily a medium density, middle class neighborhood 
comprised of single family, privately owned homes. 
Much of the commercial 
activity is located in the Christiansted area and most of the r~on Bijou 
residents commute to work. 
Mon Bijou is a typical residential subdivision 
with paved' streets and houses arranged in orderly fashion. 
Downstream in 
the Glynn area, development is more random and less dense. 
Below the Glynn 
area another major tributary, Bonne Esperance joins canaan Gut to form the 
Salt River. 
At this point the watershed becomes somewhat flatter with a 
more pronounced flood plain. 
As such, the flood plain is less developed 
with considerably more natural vegetation rimmed by agricultural develop-
ment. 
As noted earlier, the distribution of rainfall in the Mon Bijou area 
varies widely during the year. 
It is characterized by long, dry seasons with 
intermittent periods of high intensity rainstorms. 
The more intense storms 
generally result from tropi ca 1 disturbances that move across the area. 
These dump large volumes of rainfall over relatively short periods of time. 
Estimates of potential rainfall for various return frequency rainfall events 
in the study area were taken from the U.S. Weather Bureau's Technical Paper 
No. 42 and No. 25 for Puerto Rico and the Virgin Islands. 
Based on this 
data, a storm with a return period of once every 100 years would generate a 
six-hour total rainfall of nine inches. A similar storm of 12-hour duration 
would generate 12 inches of rainfall. 
By comparison, the storm that struck 
the Mon Bijou area on 7 October 1977, resulted in a total 12-hour rainfall 
of 12 to 14 inches. 
The most extreme events recorded in the general area 
involved a storm which produced a total of 23.7 inches of rainfall over a 
24-hour period at American Hill on St. John Island, and another that 
produced 15.5 inches at Estate Charlotte Amalie on St. Thomas. 
Thus, 
significant events do occur in the study area which generate large volumes 
of rainfall over relatively short periods of time. 
As a result of the intermittent occurrence of rainfall in the study 
area most of the stream channels are normally dry discharging only during 
periods of rainfall. Therefore, ground water is often used as the primary 
source of water supply. 
Also, the normally dry state of the stream channels 
belie the runoff that may be conveyed during periods of intense rainfall. 
In the Canaan Gut Basin, this problem is particularly acute due to the 
extremely steep nature of the upper basin. 
This steep slope combined with 
the soil characteristics yield a short concentration time and relatively 
high runoff rate. This combined with the intense rainfall that occurs 
yields a flashflood effect in the r~on Bijou area. 
This is readily exhibited 
in the upper part of Canaan Gut by an average lag time of less than 30 
minutes. 
Thus, even with a drainage area of only 0.87 square miles above 
Mon Bijou, the estimated 10-year frequency flood discharge is in excess of 
1800 cubic feet per second (cfs) while the 100-year frequency flood 
discharge is in excess of 3270 cfs. 
Not only are the flows considerable, 
but the flow velocity is also high due to the steep slope of the basin. 
Even in the flatter Mon Bi jou/Glynn area the channel velocity is sti 11 8-10 
feet per second under flood conditions. 
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Flood stages in the area, while dependent on the magnitude and velocity 
of flow, also greatly reflect the condition of the channel. 
Previous runoff 
has established a water course through the area to the Salt River. 
For the 
most part this water course reflects the topography, soil composition, and 
high velocities, i.e., it is a fairly well defined channel with rocky bottom 
and sides. 
However, the aevelopment associated with Mon Bijou has greatly 
altered this condition near the center of the Canaan Gut basin. 
Tw.o roads 
cross the normally dry channel just above the Mon Bijou residential area. 
Both have small culverts which pass only minimal flow. Therefore they are 
frequently overtopped forcing water up and out of the channel. 
Just 
downstream of these two roads at the residential area, the stream is 
diverted into a 700-foot-long, four-foot by six-foot box culvert. 
Again, · 
the carrying capacity of this structure is so small that much of the storm 
runoff is forced up and out of the stream channel. 
However, at this point 
the overflow enters the residential area and floods homes, streets, cars, 
and other property. 
The flood problem in this area is compounded by the confluence of 
Little Fountain Gut. 
The channel for this subbasin is less well defined, 
even above Mon Bijou. 
However, as it enters the residential area, it flat-
tens out and becomes completely obscured with no drainage course through the 
area. 
Thus, all of its flow is haphazard through the housing area until it 
reaches the Canaan Gut channel downstream of the culvert. 
At this point, 
the flow from both Canaan Gut and Little Fountain Gut is concentrated back 
in the channel area. 
The steep slope and well defined channel through the 
remainder of the residential area contain some of the runoff within the 
immediate channel area. 
At the lower end near the beginning of the Salt 
River portion the slope flattens to generate higher backwater with a 
corresponding widening of the flood plain and flooded area. 
FUTURE CONDITIONS 
Because of the nature of the steep terrain in the Canaan Gut drainage 
basin above the Mon Bijou area, little additional development is expected. 
Therefore, no increases are expected in runoff from the upper basin. 
Development within the Mon Bijou/Glynn area is expected to continue. 
However, this development should be either located outside of floodprone 
areas or at least compatible with the flood hazard. 
Therefore, no increase 
is expected in the amount of property subject to flooding. 
PROBLEMS, NEEDS, AND OPPORTUNITIES 
In the Mon Bijou/Glynn area there are 31 houses subject to flooding 
from a 2-year frequency flood. 
This increases to 96 houses for a 100-year 
flood. 
As such, a 2-year flood would produce over $344,000 in flood damages 
while a 100-year flood would generate $1.7 million damage. 
Average annual 
damages amount to $442,150. 
In addition to the monetary damage. the nature 
of the flooding endangers residents of the area. 
As noted earlier, there is 
only a 30-minute lag time for the watershed above Mon Bijou. 
Thus, within 
that time a heavy rainstorm can send a 4 to 6 feet deep torrent through the 
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residential area. 
Under these conditions, there is a substantiaT and 
sign_ificant threat to the safety of the Mon Bijou residents. 
The frequency of flooding of the r~on Bi jou area compounds the problem 
of severe flooding. 
From 1975-1980 the area was subjected to three 
significant floods. 
The flood in October 1977 was by far the worst with an 
estimated return frequency in excess of 100 years. 
As~a result of the 
significant and frequent flooding of the area, many of the more flood-prone 
homes- have been periodically abandoned. However, because of the need for 
housing and the disarming appearance of the dry streambed, reoccupancy by 
others occurs quickly. 
From the previous description of the area and the flooding experienced, 
it can be readily seen that the flood problems are primarily the result of 
encroachment into the flood plain and obstruction of the fl~od flow by 
inadequate facilities. 
Given the nature of the flooding with significant 
damage and threat to human life. there exists a definite need for measures 
to reduce the flooding or its effects on the area. 
There also exists a 
substantia 1 opportunity to enhance the economic status. safety, and genera 1 
well-being of the Mon Bijou community through the reduction of flooding in 
the area. 
PLANNING OBJECTIVES 
In order to determine a potential solution to water resource related 
problems such as those described above, it is necessary to identify the 
objectives that any such solution should strive to attain. 
The Water 
Resource Council•s (WRC) Principles and Guidelines (P&G), noted earlier, 
provide the national objective for all water resource related studies. 
SpeCifically, the study should strive to develop plans that enhance. or make 
positive contributions to National Economic Development in a manner that is 
consistent with protection of the environment. 
For the Mon Bijou study area 
this can be refined to objectives which address the specific problems of the 
a rea , name 1 y : 
a. 
Reduce flood damages and other related costs in the Estate Man 
Bijou and Glynn areas; 
b. 
Restore, enhance, and/or preserve environmental attributes of the 
area; 
c. 
Enhance recreational opportunities in the study area; 
d. 
Reduce hazard to life and property due to flooding in the study 
area; and 
e. 
Protect, preserve, or minimize impacts on significant historical 
and cultural resources of the study area. 
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PLANNING CONSTRAINTS 
While the above planning objectives describe the goals of the study, 
there are certain limitations which must be considered in evaluating any 
plan for possible implementa-tion. 
The primary constraint that must be 
• 
considered is the overall scope of the study. 
As noted earlier, this 
investigation is being conducted under the Continuing Authority Program as 
provided by Section 205 of the 1948 Flood Control Act, as amended. 
As noted 
in the authorizing legislation, this program specifically addresses small 
projects for flood control. 
Therefore, any study conducted under this 
program should be primarily for flood control and be of a more localized or 
limited nature. 
Basinwide or regional studies are beyond the scope and 
intent of this program. 
Based on this constraint, the study was directed 
primarily at flood control for the r~on Bijou/Glynn area. 
Study 
investigations were then conducted only to the level of detail necessary to 
define and quantify the flooding and related problems and identify the most 
appropriate plan for addressing these problems. 
Additional constraints relate to various laws, Executive Orders, 
directives, and regulations which govern the investigation of water resource 
problems. Of these, two Executive Orders, 11988 governing Flood Plain 
Development and 11990 concerning conservation of Wetland areas, provide 
specific criteria which must be addressed by any proposed action. E.O. 11988 
requires consideration of 4 specific criteria. Namely: 
* Avoid development in the base flood plain (100-year) except 
where it is the only practical alternative. 
welfare. 
* Reduce the hazard and risk associated with floods. 
*Minimize the impact of floods on human safety, health, and 
* Restore and preserve the natural and beneficial value of the 
base floodplain. 
POSSIBLE MEASURES 
In light of the above objectives and overall study constraints, the 
possible measures that were initially considered were directed primarily at 
the problem of flooding in the Mon Bijou/Glynn area. 
These include: 
a. 
No action 
b. 
Flood warning 
c. 
Floodproofing 
d. 
Flood plain evacuation 
e. 
Clearing and snagging 
f. 
Levees 
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g. 
Retention/detention reservoirs 
h. 
Channel modifications 
i. Streamflow diversion 
The "no action" alternative represents the expected future conditions 
of the area in lieu of implementation of any of the other above plans. It 
provides the baseline conditions against which all effects and impacts may 
be measured. 
It is carried through the entire planning process as a 
selectable option should studies fail to identify a more feasible and 
implementable alternative. 
Under this alternative flood plain zoning is 
assumed to be in effect. Thus, future development is assumed to be either 
in areas without flooding or to be compatible with the flood hazard. 
Flood warning is used primarily to provide residents of flood-prone 
areas an opportunity to prepare for an impending flood. 
It is very useful 
to alert such residents of approaching storms that may generate flooding or 
on large watersheds, to warn of flood waters that are moving toward a 
particular area. 
Floodproofing can be used to modify existing flood plain development to 
make it more compatible with the flood hazard. 
Generally, this is 
accomplished by elevating structures above flood levels, providing ring 
levees, or dikes, or waterproofing a structure~ 
Flood plain evacuation involves the removal of damageable property from 
the flood prone area. 
This can be done by moving the house or structure to 
another location or by demolishing the existing structure and rebuilding 
elsewhere. 
Evacuation thus restores the flood plain to original condition 
allowing it to function as an overflow storage area. 
Clearing and snagging can be used on streams that have obstructions to 
flow. 
Such obstructions retard the streamflow causing a decrease in 
velocity and an increase in water levels. 
This is very useful for areas 
where vegetation may clog the channel, old trees or debris may fall or be 
blown or discarded into the channel, or low velocities are insufficient to 
maintain a well defined and efficient channel. 
In such cases clearing and 
snagging can be used to increase flow rates and reduce flood levels. 
Levees generally involve either earthen or concrete walls which block 
water movement into certain areas. 
Thus, they reduce the extent of area 
subject to flooding and the property subject to danger. 
In this manner, the 
flood plain is altered to be more compatible with existing or planned 
development. 
Occasionally, training levees may be used along either or both 
sides of the stream to confine flood water to the stream area or floodway. 
In reducing the extent of flooding and the flood plain, levees also reduce 
available storage and can cause an increase in flow rate and flood level. 
Therefore, the usefulness depends a great deal on the topography and other 
physical characteristics of the area. 
-9-
Flood retention/detention reservoirs can be used to temporarily store 
flood waters above flood-prone areas, thus reducing the downstream flow 
volumes and flood levels. 
Later, the flood waters can be released at a 
controlled rate to minimize the downstream effect. 
The usefulness of such 
reservoirs is very dependent on the physical characteristics of the upper 
watershed and the status of development within that area. 
Channel modification can be used to alter the existing stream channel 
and increase its carrying capacity. 
This is usually acomplished by 
excavating to make the stream channel either wider or deeper or both. 
This 
increases the velocity and flow rate of the floodwaters thereby reducing 
flood levels and the extent of flooding. 
The magnitude and extent of the 
effect of channel modification on flooding is directly dependent on the 
extent of excavation, the larger the channel the greater the reduction in 
flood levels. 
However, since flood plain storage in the channelized area is 
reduced and flow velocities are increased, downstream flooding may actually 
be greater due to greater flow rates and hydrologic regime alteration. 
Thus, the usefulness of this measure may depend on downstream conditions as 
well. 
Stream flow diversion can be used to redirect flood waters around a 
particular area. 
This precludes their entry into the problem area thereby 
greatly reducing the flood prob 1 ems of that area. 
This is often 
accomplished by constructing a secondary channel bypass around the problem 
area to connect at some downstream point or to another drainage course. 
The effectiveness of this measure is thus very dependent on the physical 
setting and characteristics of the area. 
INITIAL SCREENING 
In order to develop alternative plans for the Mon Bijou area it was 
necessary to examine each of the above possible measures in light of its 
specific applicability to the problems at Mon Bijou. 
In this manner, plans 
could be developed that incorporate features applicable to the specific 
problems being experienced. 
As noted earlier, the "no action" measure 
provides the basis of the without project conditions for the study area. 
Therefore, it was carried through the evaluation process as the "No Action 
Plan". 
Flood warning in the Mon Bijou area is based solely on prediction of 
excessive rainfall. 
Because of the small basin size and short lag time, 
there is no warning of approaching flood water. 
Thus, flood prediction is 
indirect depending on the accuracy of meterological forecasts of rainfall 
volume and intensity. 
Based on the nature of flooding experienced, this is 
generally good only for significant atmospheric disturbances such as 
tropical depressions. 
Even for these, the residents can only remove 
themselves and readily transportable belongings to areas of relative safety. 
Little can be done to protect the houses from the flood waters. 
Thus, while 
this measure is good for protecting life and some property, it is not 
-10-
' 
considered adequate for effectively reducing flood damges in the area. 
For 
this reason, it was not considered further in this study even though it 
should be continued and enhanced at the local level to protect life in the 
area. 
Floodproofing was reviewed based on the physical characteristics of the 
Mon Bijou area. 
The nature of the flooding, i.e., rapidly rising flood 
waters with high velocity, make floodproofing by structure raising or 
waterproofing undesirable. 
With the high velocity flows, there is some 
danger of potentia 1 structura 1 collapse due to the water force on the 
structures. 
Also, the need for emergency evacuation may actually increase 
due to the perceived protection provided which results in people remaining 
in houses too long and thus becoming trapped. 
The extent and density of 
development preclude the use of ring levees as a possible measure for 
reducing flood damages. 
Therefore, the alternative of floodproofing was not 
considered further in the analysis. 
Flood plain evacuation can be used in the Mon Bijou area to remove the 
more flood-prone structures from the area. This would tend to restore the 
flood plain area to a low or no damage floodway. 
The current residents 
would be relocated to property elsewhere thus protecting them from future 
floods. The homes would be permanently removed thus preventing further flood 
damage or future re-occupancy. 
Since implementation of this measure is 
potentially feasible for the r~on Bijou area, it was retained for more 
detailed consi deration. 
Clearing and snagging in the main problem area of Mon Bijou was not 
deemed appropriate since much of the flood problem stems from insufficient 
culvert capacity at Mon Bijou. 
Below the culvert, the natural channel is 
maintained in reasonably good condition by the high velocities, even though 
vegetation has overgrown the channel in some areas. 
Because of the large 
volume of flow, additional clearing or debris removal would not 
significantly alter flood conditions. 
Therefore, this measure was not 
considered further. 
Levees could be used in the Mon Bijou area to channel flood flows 
around housing areas where topography would permit. 
In examining the Mon 
Bijou topography there appears to be only one area where a levee could be 
used, that is near the Little Fountain Gut drainage entrance into Mon Bi jou. 
A levee could be used there to divert runoff from Little Fountain Gut away 
from the houses. 
Elsewhere, along the Canaan Gut Channel, the density of 
development, nature of flooding, and topography generally preclude the use 
of levees as a singular solution. 
Also, the levee diversion at Little 
Fountain Gut would have to be accompanied by additional Canaan Gut channel 
work to reduce overall flood levels at Mon Bijou. Therefore, levee 
construction was only considered in combination with other structural 
measures for the area and generally as a flow diversion action. 
Where 
warranted it was included with other plans as discussed below. 
The potential of flood retention/detention reservoirs in the Mon Bijou 
area is dependent on the upstream basin size, shape, and other physical 
-11-
L 
characteristics as well as the volumes of runoff expected. 
As previously 
noted, the drainage area above Mon Bijou is very small. 
However, the slopes 
are steep and the runoff rates are high. 
This combination of features 
precludes the use of an upstream storage reservoir. 
The large volumes of 
runoff and 1 imi ted capacity of any site yie 1 d poor conditions for upstream 
storage possibilities. Therefore, no plans were developed and this measure 
was dropped from further consideration. 
Channel modification can be used at Mon Bi jou to enlarge the channel 
through areas where natural or manmade features obstruct or retard flow 
causing higher flood levels. 
Upstream of the Mon Bijou area there is a 
relatively well defined channel with little development which obviates any 
need for enlargement or modification of the channel. 
At Mon Bijou the 
original channel has been replaced by a small box culvert through the upper 
part of the housing development. 
This culvert is grossly inadequate for 
handling flow from Canaan Gut. 
Either culvert enlargement or removal would 
signific~tly reduce flood levels in the area. 
Downstream of the culvert, 
~he natural channel resumes with a significant carrying capacity. 
Although 
flooding in this downstream area is still a problem, it is not as severe as 
the upstream culvert portion. 
Therefore, since channel enlargement in the 
upper Mon Bijou area does appear to offer a potential solution to the flood 
problem being experienced, it was retained for more detailed consideration. 
As noted earlier, streamflow diversion is practical where topography 
and other conditions permit the construction of bypass channels around 
problem areas. 
In the r~on Bijou area the more concentrated development is 
found in the Mon Bijou/Glynn residential area. 
The area surrounding the 
housing area is largely open farm land. 
While the topography can still be 
classified as rolling, it is similar to the housing area and could support a 
bypass diversion plan. 
By diverting flow from Canaan Gut and Little 
Fountain Gut away from Mon Bijou the flooding and associated damage could be 
greatly reduced. The CH2M Hill report noted earlier identified a diversion 
plan as a feasible solution to flooding in the Mon Bijou area. 
Therefore, 
it was retained for more detailed analysis. 
Thus, of the possible measures initially considered, only evacuation of 
the flood plain, channel modification, and stream flow diversion appear to 
offer any potentially feasible solution to the flood problems at Mon Bijou. 
The "no action" alternative was also retained for comparative purposes as 
well as possible recommendation. 
The other possible measures were dropped 
from further consideration or combined as special features of those measures 
retained as noted above. 
ALTERNATIVE PLANS 
Based on the initial screening above, alternative plans were developed 
for those possible measures that were identified as being potentially 
feasible for implementation in the Mon Bijou area. 
The "no action" plan 
·represents the without project conditions for the future should all of the 
other alternatives prove to be not implementable for economic, 
-12-
I 
environmental, institutional, or other reasons. Under this alternative 
periodic and devastating floods would continue to strike the area, From 
past experience, it is assumed that the accompanying cycle of 
periodic abandonment of the mort severely damaged houses would follow 
significant flood events. 
As in the past, it is anticipated that 
reoccupation of the abandoned structures would occur during prolonged flooa-
fret periods. Therefore, the flood damage potential is expected to remain 
for the current development in the flood plain. However, considering the 
unsuitable nature of the upper Canaan Gut Basin for development due to the 
steep'terrain, any increase in flood levels due to increased runoff is 
unlikely. Also, with proper enforcement of flood plain zoning regulations, 
there should be only minimal increase in the overall damage potential of the 
area due to control of future development of flood-prone areas. Therefore, 
average annual flood damages are expected to continue at $442,150. 
Evacuation of the flood plain could be used to reduce these damages by 
removing the flood-prone structures from the flood plain. Considering the 
type of construction, evacuation in the Mon Bijou/Glynn areas would involve 
the relocation of the occupants to another dwelling and the demolition and 
removal of the house. 
In Mon Bijou several levels of evacuation were 
analyzed based on frequency of flooding. Estimated benefits were based on 
the externalized costs res~lting from flooding, i.e. those costs borne by 
non flood plain residents. Estimated implementation costs include the 
purchase of the structure and land, relocation of the residents, demolition 
of structure, and clearing and restoration of the site. Table 2 presents a 
summary of estimated costs and benefits for different levels of evacuation. 
TABLE 2 
FLOOD PLAIN EVACUATION 
NUMBEA OF 
EXTERNALIZED 
ESTIMATED 
ANNUAl 
NET 
BC 
LEVEL 
STRUCTURES 
ANNUAL BENEFITS 
FIRST COSTS 
COSTS 
BENEFITS 
RATIO 
2-Yr 
31 
$248,120 
$2,579,180 
$245,370 $ 2, 750 
1.01 
5-Yr 
40 
340,200 
3,270,500 
310,850 
29,350 
1.09 
10-Yr 
47 
350,700 
4,027,890 
364,630 -13,930 
0.96 
25-Yr 
64 
355,320 
5,114,080 
485,470 -130,150 
0.73 
The above table indicates that the 2- and 5-year levels of evacuation 
are economically feasible. These would involve the removal of the more 
flood-prone houses in the Mon Bijou and Glynn areas. This would not reduce 
actual flooding in the area, only the damage sustained. 
Channel modification could be used to reduce the actual flood levels in 
the Mon Bijou area thereby reducing damages resulting from these floods. ln 
analyzing possible schemes for channel modification for the upper Mon 81jou 
ar·ea two approaches appeared feasible; 
-13-
... 
a. To replace the existing box culvert with a larger culvert and improve 
inflow and exit conditions, and 
b. Restore the original ch~nnel by removing sOme houses and excavating a 
channel through the area. 
_ 
~ 
. 
. 
· To handle the flow from little Fountain Gut a small diversion channel with 
bordering levee could be provided to divert water directly to the Canaan Gut 
Channel. This would eli~inate the overland-flow flooding frO. this tributary. 
Benefits attributable to either of these two plans would be a direct result of 
reduced flooding in the area. Table 3 below shows the average annual benefits . 
and costs for each plan. Channel modification in the lower part of the Mo~. 
Bijou/Glynn area was not economically feasible. Therefore, it was not 
· 
included in any of the shown plans. 
TABLE 3 
CHANNEL MODIFICATION PLANS 
ANNUAL 
ESTIMATED 
ANNUAL 
PLAN 
BENEFITS 
FIRST COSTS 
COSTS 
Enlarged Culvert 
$382,720 
$3,675,000 
$335,640 
Open Channel 
$378,320 
$3,623,450 
$330,300 
NET 
BENEFITS 
$47,080 
$48,020 
B-C 
RATIO 
1.14 
1.15 
As shown in Table 3 both plans represent economically feasible solutions 
to the flood problems by reducing flood levels in Mon Bijou. 
In analyzing possible schemes for streamflow diversion at Mon Bijou, 
consideration was initially given to the diversion plan presented in the CH2M 
Hill report. This provides a bypass channel extending from Canaan Gut just 
upstream of Man Bijou, around the north side of the housing area, 
intercepting Little Fountain Gut, and rejoining Canaan Gut downstream of the 
Glynn area at the beginning of Salt River. Several variations of the basic 
plan were analyzed which included different channel sizes and linings, levee 
diversions, drop structures, and instream detention ponds for water control. 
Included within these variations was the possible use of roller compacted 
concrete (RCC) which was evaluated to determine the feasibility of this 
measure based on its constructibility. This option was not found to be a 
viable alternative during the evaluation process and was discontinued. 
Table 4 below presents a summary of the economics for some of the plans con-
sidered. 
As noted in the table, only one bypass plan is considered to be 
economically feasible. Therefore, only that plan was retained for further 
consideration. The bypass plans were formulated in accordance with paragraph 
3-4, b.(l) of ER 1105-2-20. 
The division levee was designed to the SPF level 
to prevent a catastrophic event should it be overtopped. 
Due to the extremely 
steep gradient, the bypass channels were designed for hydraulic integrity to 
prevent the loss of velocity controls by flows bypassing them out of bank. 
The 
existing drainage system through Estate Man Bijou and Glynn is adequate to 
handle runoff from the drainage area downstream of the division with minimal 
damage. 
For levels of protection less than that provided by the considered 
bypass plans, a structure would be required through the diversion levee to allow 
flow to continue through the developed area. This would increase the costs of 
the diversion alternatives while reducing the benefits, therefore the plans 
did not consider these alternatives and the bypass plans are considered to be 
optimized as described above. 
Rev. 4/88 
-14-
'~ ·-
•. 
e 
TABLE 4 
CHANNEL BYPASS PLANS 
ANNUAL 
FIRST 
ANNUAL 
NET 
B-C 
PLAN 
BENEFITS 
COSTS 
COSTS 
BENEFITS 
RATIO 
Concrete Bypass 
$415,800 
$8,225,000 
$720,920 
-305,120 
0.6 
Gabi on Bypass 
$415,800 
$4,950,000 
$443,870 
- 28,070 
0.9 
(Completely lined) 
Earthen Bypass 
$415,800 
$5,355,000 
$476,700 
- 60,900 
0.9 
(w/sheet pile drop) 
Earthen Bypass 
$415,800 
$3,667,800 
$338,000 
$77,800 
1.2 
(w/Gabion drop) 
INITIAL EVALUATION 
The alternative plans discussed above were evaluated to determine 
significant impacts and identify major areas of concern that would be useful 
in the development of detailed plans. 
Potential impacts were assessed in 
terms of anticipated economic, environmental, social, and other changes in 
the without project condition that would result from the implementation of 
the considered alternative. 
As discussed earlier, the "no action" plan 
represents the without project conditions for the future. 
Under this con-
dition the present flooding would continue with average annual damages of 
$442,150. 
The economic well-being of the area would suffer because of this 
continuing damage. 
Given the availability of flood insurance, the monetary 
losses from flooding would be largely borne by persons outside the Mon Bijou 
area. This adversely affects economic activity at the territory and 
national level. Locally borne costs would continue to adversely affect the 
flood plain residents and local government agencies responsible for 
emergency duty and cleanup. 
Continued flooding would also discourage 
property improvement or upkeep thereby depressing normal affluence-related 
increases in economic levels for Mon Bijou. 
Environmentally, continued "no action" would have negligible impacts on 
existing conditions. The Mon Bijou natural environment has been 
substantially altered by the previous activities of man. 
There are no 
present plans to alter this condition. 
Future development of the area would 
probably be characterized by the continued conversion of farm lands to resi-
dential and commercial areas. 
However, no significant or outstanding 
environmental attributes were noted in the immediate Mon Bijou area that 
would be affected by this continued growth. 
Aesthetically, the area would 
suffer adverse side effects from the flooding primarily due to the house and 
yard damage and deterioration or lack of upkeep during periods of abandon-
ment. 
Other significant impacts of continued no action would relate to the 
safety and overall well-being of the area residents. As discussed earlier, 
the area is subject to flash-flooding. This poses a continuing threat to 
~ 
life of the flood plain occupants. 
Although no loss of life has yet been 
-15-
reported, the threat and potential are significant under the existing flood 
conditions. 
This constant threat would continue to have a demoralizing 
effect on the residents adversely affecting their general well-being. 
The flood plain evacuation alternative would reduce the flood damages 
being experienced by removing the structures from the flood hazard area. 
Since most of the current damages are borne outside the flood plain, a 
reduction would be of widespread benefit. 
The costs associated with removal 
of these structures would also be borne by non-flood plain residents. This 
would be a widespread detriment. 
However, since the benefits exceed the 
costs for the 2- and 5-year levels of evacuation (Table 2), the overall 
effect would be beneficial. 
Locally, the construction effort would have a 
minor, temporary beneficial impact on the area. 
Environmentally, evacuation would provide potentially beneficial though 
minor impacts for the area. 
Removal of the structures and replacement with 
green areas could have a beneficial effect if properly maintained. 
Assuming 
replacement property was required elsewhere, the net effect for the island 
would probably be negligible. 
There would be some minor temporary adverse 
effects associated with the construction effort. These should cease shortly 
after completion of construction. 
Other impacts would be primarily related to the relocation of the 
residents. 
While the overall safety and well-being of those evacuated would 
be improved, there would be other varying effects that would depend on 
individual circumstances, e.g. movement away from friends or relatives, jobs, 
etc. and disruption of established neighborhood. 
Channel modification would also reduce flood damages in the area. 
However, in this case, it would result from an actual reduction in flooding. 
This would be beneficial to both flo~d plain and non-flood plain residents. 
Costs of construction would adversely impact primarily non-area residents. 
However, as shown in Table 3, the benefits outweigh the costs. Therefore, 
the net impact would be beneficial. 
As with evacuation, there would also be 
some minor, temporary beneficial impacts on the local economy due to the 
construction effort. 
The environmental effects of channel modification in the Mon Bijou area 
would be generally minor. 
As noted earlier, the original stream channel in 
the primary problem area has been replaced by a concrete culvert. 
The 
culvert modification plan would have temporary adverse impacts during 
construction. 
Otherwise, the constructed facility would be similar to the 
existing one. 
The open channel plan would restore an open stream channel 
through the area. 
It would have adverse impacts during construction. 
However, long-term impacts would tend to be beneficial due to the 
reestablishment of an open channel. 
Other impacts of channel modification 
would be primarily beneficial, related to the reduction in flooding, flood 
damage, and threat to life and safety. 
-16-
Only one of the stream flow diversion plans was found to be economi-
cally feasible. This plan would involve the construction of a bypass chan-
nel around the northern side of the Mon Bijou and Glynn areas. This channel 
would be grass-lined and have 34 gabion-lined drop structures to control 
flow velocities in the channel. 
The bypass channel would begin just 
upstream of the Mon Bijou area and end at the Salt River just downstream of 
the Glynn area. This plan would reduce flood damages in the area by 
diverting the flood waters away from the developed areas. This reduction in 
flood damages would have a beneficial effect on area residents as well as 
the general economy. 
Construction costs would have an adverse effect on 
primarily non-flood plain residents. However, since the reduction in flood 
damages is greater than the costs required to achieve that reduction, the 
effect on the economy would be beneficial. Other economic impacts would be 
related to the minor, though temporary, beneficial impacts on the local 
economy due to the construction effort. 
Environmentally, this alternative would have generally adverse, though 
minor impacts. 
Existing vegetation along the construction right-of-way 
would be destroyed. This would be replaced by a grassed area which would be 
periodically mowed. 
Other impacts would be minor. 
Social impacts would be mainly related to the reduced flooding and 
improved safety and well-being of area residents. This would have a signi-
ficant beneficial impact on local residents. 
DETAILED PLANS 
In reviewing the alternative plans discussed above, four main plans, in 
addition to the "no action" plan, appear to warrant a detailed investigation: 
a. 
Flood plain evacuation; 
b. 
Construction of new culvert through upper portion of Mon Bijou; 
c. Channel modification through the upper portion only; 
d. 
Channel diversion around the developed areas. 
Since two economically feasible levels of evacuation exist, the 
economically optimum level, 5-year, was chosen for detailed analysis. The 
two upper portion only channel modification plans were both retained for 
detailed analysis due to their significantly different designs and economic 
feasibility. 
The flood plain evacuation plan (plan A) would remove all structures 
within the 5-year flood plain. This involves 35 houses in Mon Bijou and five 
houses in the Glynn area (see plate 7). 
Implementation of this plan would 
require the purchase of the land and improvements from the then current 
owners. 
Relocation assistance would be provided to the occupants in accor-
dance with the provisions of Public Law 91-646. 
When the structures are 
empty, all salvageable equipment would be removed and the structures demo-
lished. The area would be cleaned and replanted as necessary to provide an 
acceptable appearance. 
-17-
In all, this plan would initially cost about $3.27 million. 
On an annual 
basis, at 8-5/8% interest for 50 years, the total cost would be $310,850. 
Average annual flood damages would be reduced from $442,150 to $84,150. 
Annual benefits would be the externalized (national level) reduction in 
costs. This is approximated by the total flood damages eliminated ($358,000) 
less the costs borne by flood plain occupants ($11,300 for flood insurance 
premiums and $7,320 for deductible losses). Costs associated with 
administration ($800) are added in. 
The result amounts to $340,200 annually. 
This yields a net annual benefit of $29,350 and a benefit to cost ratio of 
1.09. 
The culvert enlargement plan (Plan B) actually would involve the 
construction of a new culvert adjacent to the existing culvert (see plate 8). 
The existing culvert would be left in place. This plan would include a 
diversion channel and levee to intercept flow from Little Fountain Gut and 
direct it to Canaan Gut. 
Also included would be two new concrete bridges 
with paved approaches, a debris basin, a gabion-lined approach channel, a 
10-by-15-foot reinforced concrete box culvert 512 feet long with stilling 
basin, and a gabion-lined exit channel. 
A construction easement would be 
needed to install the box culvert while areas of the open channel, levee, 
and debris basin would have to be acquired. 
No relocation of houses or 
other structures would be required under this plan even though minor 
utility and street work would be required. 
Periodic maintenance would also 
be required to remove debris from the debris basin, maintain the gabion 
lining, and maintain the levee and access areas. It should be noted that 
this plan involves a high velocity (>20 feet per second) culvert. Therefore, 
the debris basin is very important to the proper functioning of the works. 
In all, this plan would initially cost about $3.7 million. 
On an annual 
basis, at 8-5/8% interest for 50 years, the cost would be $335,640. 
Annual 
benefits would result from the reduction in flooding. 
Average annual damages 
would be reduced from $442,150 to $59,430 resulting in an annual benefit of 
$382,720. This yields a net benefit of $47,080 annually and a benefit to 
cost ratio of 1.14. 
The open channel plan (Plan C) involves the reestablishment of an open 
channel through the upper Man Bijou area. 
A channel would be excavated as 
shown on Plate 9. 
A diversion plan for Little Fountain Gut would be 
included to direct the flow to the new channel. 
Plan C would require the 
removal of six houses along the new channel right-of-way. 
These would be 
acquired, the occupants relocated, and the structures removed to permit 
construction of the channel. 
The main channel would be trapezoidal with a 
bottom width of 20 feet and side slopes of one vertical to two horizontal. 
The sides and bottom would be grassed to reduce erosion. Seven steel sheet 
pile drop structures would be provided to reduce velocities in the new chan-
nel reach. 
Each structure would lower the channel grade about six feet. 
The total length of the new channel would be about 1800 feet. 
Two new 
bridges would be required to span the new channel. 
One local street would 
be barricaded. 
-18-
In all, this plan would initially cost about $3.6 million. 
On an 
annual basis, the cost would be $330,300. 
Annual benefits would result from 
the reduction in average annual flood damages from $442,150 to $59,430. 
Since six houses would be relocated, some damage reduction benefits would be 
lost due to externalization. Average annual benefits are thus estimated at 
$378,320. 
This would yield net benefits of $48,020 and a benefit to cost 
ratio of 1.15. 
Plan 0 involves the construction of a 6,500-foot-long bypass channel 
around the northern side of Mon Bijou and Glynn. 
This channel would begin 
at the roadway upstream of the Mon Bijou area and travel through the undevel-
oped areas in an easterly direction. A levee on the southern side of the 
new channel would divert runoff into the new channel. The new channel and 
levee would also intercept water draining from Little Fountain Gut. 
This 
diversion channel would follow the n~tural ground slope through the existing 
dam which would be removed. 
It would then rejoin the Canaan Gut channel at 
the headwaters of the Salt River just downstream of Glynn. 
The diversion 
channel would be trapezoidal with a bottom width of 75 feet and a side slope 
of 3 horizontal to 1 vertical. Channel depth would vary w~th topography 
but generally range 8-12 feet. 
To control flow velocities in the channel, a 
series of 34 gabion-lined drop structures would be placed along the channel. 
Each would lower the water some 3-4 feet. The main channel would be grass 
lined between the drop structures. 
Two new bridges would be required for 
the channel as well as the removal of at least 3 houses in the lower portion 
of Glynn. 
In all, this plan would cost about $3.8 million. 
On an annual basis, 
this would amount to $338,000. 
Annual benefits, which would result from a 
reduction in flooding would amount to $415,800. 
This would yield a benefit-
cost ratio of 1.23 and net benefits of $77,800. 
ASSESSMENT AND EVALUATION 
In order to determine the most appropriate plan for implementation in 
the Mon Bijou area, the detailed plans presented above were evaluated in 
light of their overall accomplishments and effects. 
To facilitate comparison 
these were evaluated only in light of the net change to the without project 
conditions that would be experienced under the uno action'' plan. Table 5 
shows a summary comparison of the four detailed plans. 
-19-
PLAN A 
ITEM 
EVACUATION 
A. 
Plan Description 
1 • 
Major Features Removal of 40 houses from 
5 year floodplain InMon 
Bljou and Glynn area. 
2. First Cost 
$3,270,500 
B. 
Accomp II shments 
1 • 
Reduce f I ood 
Reduces damaqes to those 
Damaqe 
houses removed. 
N 
0 
2. 
Enhance 
Restores II ml ted area to 
Environment 
more natural condition. 
3. 
Enhance 
Recreation 
No enhancement. 
4. Reduce F I ood 
Reduces flood damaqe. 
Does 
Hazard 
not reduce hazard of flooding 
to remalnlnq houses. 
5. Protect, 
No enhancement. 
Enhance 
Cultural 
Resources 
• 
TABLE 5 
SUMMARY COMPARISON OF DETAILED PLANS 
PLAN B 
PLAN C 
CONCRETE CULVERT 
OPEN CHANNEL 
Construction of new culvert 
Construction of an open 
In upper portion of Mon Bljou. 
channel through upper 
portion of Mon Bljou. 
$3,675,000 
$3,623,450 
Reduces flood dama9es In upper Reduces flood damaqes by 
portion by reduclnq flood 
reduclnq flood levels In 
levels. 
upper portion. 
No enhancement. 
No enhancement. 
PLAN D 
DIVERSION CHANNEL 
Construction of a new 
diversion channel 
around the northside 
of the area. 
$3,667,800 
Reduces flood damaqes 
by reducing flood levels 
In Mon Bljou and Glynn 
area. 
No enhancement. 
Reduces floodlnq In area. 
Reduces flooding In area. Significantly reduces 
flooding In area. 
Reduces flood hazard by 
lowerlnq flood levels. 
No enhancement. 
e 
R~uces flood hazard by 
Reduces flood hazards 
lowering flood levels. 
by diverting flow. 
No enhancement. 
No enhancement. 
• 
ITEM 
c. 
N -
• 
SIGNIFICANT IMPACTS: 
PLAN A 
EVACUATION 
e 
TABLE 5 
SUMMARY COMPARISON OF DETAILED PLANS 
PLAN B 
CONCRETE CULVERT 
1. National Economic Development 
a. 
b. 
c. 
d. 
2. 
a. 
Annual Benefits 
Annual Costs 
Net Benefits 
B-C Ratio 
Environmental Quality 
Beneficial Impacts 
1) 
Manmade Resources 
2) 
National 
Resources* 
3) 
Air Quality* 
4) Water Quality* 
5) 
FIsh and W II d II fe 
6) 
Archaeological and 
a. $340,200 
b. 
$310,850 
c. 
$ 29,350 
d. 
1.09 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
a. $382,720 
b. 
$335,640 
c. $ 47,080 
d. 
1.14 
Reduces flood damage along 
stream by reducing overall 
f I ood I eve I s. 
Nl 
Nl 
Nl 
Nl 
Nl 
Historical Sturctures 
7) 
Aesthetics* 
8) 
Nolse* 
Enhanced through removal of 
Reduced f food I nq wou I d 
more frequently damaqed homes. 
encourage better upkeep 
of area. 
Nl 
Nl 
PLAN C 
<PEN a-IANNEL 
a. $378,320 
b. $330,300 
c. $ 48,020 
d. 
1.15 
Reduces flood damage along 
stream by reducing overal I 
flood levels. 
Nl 
Nl 
Nl 
Nl 
Nl 
Reduced f I ood I ng wou I d 
encourage better upkeep 
of area. 
Nl 
e 
PLAN D 
DIVERSION CHANNEL 
a. $415,800 
b. $338,000 
c. $ 77,800 
d. 
1 .23 
Reduces f I ood damage a I ong 
stream by reducl ng overal I 
flood levels. 
Nl 
Nl 
Nl 
Nl 
Nl 
Reduced f I ood I ng wou I d 
encourage better upkeep 
of area. 
Nl 
ITEM 
b. 
Adverse Impacts 
1) Manmade Resources* 
2) 
Natural Resources* 
3) A I r Qua I I ty * 
4) 
Water Qua II ty* 
N 
N 
5) 
Fish and WI ldllfe 
6) 
Archeological and 
Historical Structures 
7) 
Aesthetics* 
8) 
Noise* 
3. 
REGIONAL ECONOMIC DEVELOPMENT 
a. 
Beneficial Impact 
1) Tax Revenues* 
2) 
Property Values* 
3) 
Land Use 
• 
TABLE 5 
SUMMARY COMPARISON OF DETAILED PLANS 
PLAN A 
EVACUATION 
Removes 40 houses from 
area. 
Nl 
Minor during construction. 
Nl 
Nl 
Nl 
Minor durinq construction. 
Minor during construction. 
Nl 
Nl 
Changes existing use to use 
more compatible with flood 
hazard • 
PLAN B 
CONCRETE CULVERT 
Nl 
Minor removal of vegetatIon. 
Minor durlnq construction. 
Minor durlnq construction. 
Nl 
Nl 
Minor during construction. 
Minor durlnq construction. 
Minor Increases due to 
reduced floodlnq. 
Minor Increases due to 
reduced flooding. 
Reduces flooding of 
developed areas. 
e 
PLAN C 
OPEN CHANNEL 
Removes 6 houses from 
area. 
Minor removal of vegetation. 
Minor during construction. 
Minor durinq construction. 
Nl 
Nl 
Minor durinq construction. 
Minor during construction. 
Minor Increases due to 
reduced flood losses. 
Minor Increases due to 
reduced floodlnq. 
Reduces flooding of 
deve I oped areas. 
PLAN D 
DIVERSION CHANNEL 
Removes at least 3 houses 
from area. 
M I nor remova I of vegetation. 
Minor durinq construction. 
Minor during construction. 
Nl 
Nl 
Minor during construction. 
Minor durlnq construction. 
Minor Increases due to 
reduced flood losses. 
Minor Increases due to 
reduced flooding. 
Reduces flooding of 
deve I oped areas. 
e 
e 
ITEM 
4) 
Public Facilities* 
5) 
Public Services* 
6) 
Regional Growth 
7) 
Employment* 
N 
8) 
Business and Industrial 
VI 
Activity* 
9) 
Real Income Distribution 
10) 
Displacement of Farms* 
11) 
National Defense 
b. 
Adverse Impacts 
1) 
Tax Revenues* 
2) 
Property Values* 
3) 
Land Use 
4) 
Pub II c Fac II I ties* 
5) 
Public Services* 
PLAN A 
EVACUATION 
Nl 
e 
TABLE 5 
SUMMARY COMPARISON OF DETAILED PLANS 
PLAN B 
CONCRETE CULVERT 
Reduced damage and disruption 
from flooding. 
PLAN C 
OPEN (}lANNEL 
Reduced damage and 
disruption from flooding. 
Reduced disruption from flooding. 
Reduced disruption from flooding. 
Reduced disruption from 
flooding. 
Nl 
Nl 
Nl 
Nl 
Minor Increase during 
Minor Increase during 
construction. 
construction. 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
Removal of 40 houses 
Nl 
Nl 
from local tax base. 
Decreases value of 
Nl 
Nl 
property affected. 
Nl 
Nl 
Nl 
Nl 
Minor disruption during 
Minor. disruption during 
construction. 
(:ons tructlon. 
Nl 
Nl 
Nl 
e 
PLAN D 
DIVERSION CHANNEL 
Reduced damage and 
disruption from 
flooding. 
Reduced disruption 
from flood lng. 
Nl 
Minor Increase during 
construct ton. 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
Minor disruption 
during construction. 
Nl 
TABLE 5 
SUMMARY COMPARISON OF DETAILED PLANS 
ITEM 
6) 
Regional Growth 
7) 
Employment* 
8) 
Business and Industrial 
Activity* 
9) 
Real Income Distribution 
10) 
Displacement of Farms* 
11) 
National Defense 
~ 4. 
OTHER SOCIAL EFFECTS 
a. 
Benet lela! Impacts 
PLAN A 
EVACUATION 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
1) 
Displacement of 
Reduces requirement for 
Peop I e* 
evacuatIon dur I ng f I ood s 
2) 
Housing 
Reduces physical damage from 
flooding. 
3) 
Leisure Opportunities 
Minor Increase with more 
open areas. 
4) 
Community Cohesion* 
Nl 
5) 
Community Growth* 
Nl 
e 
PLAN B 
CONCRETE CULVERT 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
Reduces requirement for 
evacuation during floods 
Reduces physical damage from 
floodIng. 
Nl 
MInor enhancement due to 
reduced disruption from 
f I ood I ng. 
Minor enhancem~nt due to 
reduced flood potential. 
e 
PLAN C 
OPEN a-tANNEL 
.-
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
Reduces requirement for 
evacuatIon durIng f I oods 
Reduces physical damage 
from flooding. 
Nl 
Minor enhancement due to 
reduced disruption from 
flooding. 
Minor enhancem~nt due to 
reduced flood potential. 
PLAN D 
DIVERSION CHANNEL 
Nl 
Nl 
Nl 
. 
Nl 
Nl 
Nl 
Reduces requIrement for 
evacuation during floods. 
Reduces physical damages 
from flooding. 
Nl 
Minor enhancement due to 
reduced disruption from 
flooding. 
Minor enhancement due to 
reduced flood potentIal. 
e 
N 
1.11 
e 
ITEM 
6) 
Health and Safety 
e 
TABLE 5 
SUMMARY COMPARISON OF DETAILED PLANS 
PLAN A 
EVACUATION 
Minor Increase due to reduced 
f I ood I ng. 
·PLAN B 
CONCRETE CULVERT 
Minor Increase due to reduced 
flooding. 
b. 
Adverse Impacts 
D. 
I) 
Displacement of People* 
Relocates 40 families 
from area. 
2) 
Housing 
3) 
Leisure Opportunities 
4) 
Community Cohesion* 
5) 
Community Growth* 
6) 
Health and Safety 
RESPONSE TO PLANNING CRITERIA 
I l 
Accept ab I II ty 
2) 
Completeness 
3) 
Effectiveness 
Decreases available housing 
In area. 
Nl 
Disrupts existing neighborhood. 
Nl 
Nl 
Generally acceptable, but 
not strongly supported. 
Complete within Itself 
requiring only periodic 
maintenance of evacuated 
areas. 
Effective for reducing damage 
to those houses removed. 
Nl 
Nl 
Nl 
Nl 
Nl 
Nl 
General ly acceptab I e. 
Complete within Itself 
requiring only periodic 
maintenance. 
Effective for reduclnq damage. 
4 ) E ff I c I ency 
Potential benefits exceed costs. 
Potential benefits exceed costs. 
PLAN C 
<PEN Q-IANNEL 
Minor Increase due to 
reduced f I ood I ng. 
Relocate 6 families. 
Removes 6 houses. 
Nl 
Nl 
Nl 
Nl 
Generally acceptable. 
e 
PLI\N D 
DIVERSION Q-IANNEL 
Minor Increase due to 
reduced flooding. 
Relocate at least 3 
famlll es. 
Removes at least 3 houses. 
Nl 
Nl 
Nl 
Nl 
General ly acceptable 
.and supported. 
Complete within Itself 
Complete within Itself 
requiring only periodic 
requiring only periodic 
maIntenance. 
maIntenance. 
Effective tor reducing 
damages. 
PotentIal benet Its 
exceed costs. 
Most effective plan for 
reducl ng damages. 
Potential benefits 
exceed costs. Most 
efflcl ent plan. 
ITEM 
E. 
SENSITIVITY 
N 
"' 
1. 
RISI( 
2. 
UNCERTAINTY 
PLAN A 
EVACUATION 
Large floods can occur, however 
property subject to flooding 
Is reduced. 
Flood stages may be higher or 
lower for a particular event 
depending on hydrologic condi-
tions at time. 
Note: 
Nl- No or Negligible Impact 
TABLE 5 
SUMMARY COMPARISON OF DETAILED PLANS 
PLAN B 
CONCRETE CULVERT 
large f I oods can occur exceed I ng 
design capacity. 
Plan shoud stll I 
reduce flooding without failure. 
Flood stages may be higher or 
lower for a particular event 
depending on hydrologic condi-
tions at time. 
However, overal I 
stages should be considerably 
lower. 
PLAN C 
OPEN Q-IANNEL 
Large f I oods can occur excl'led I ng 
design capacity. 
Plan should still 
reduce f I ood I ng wIthout fa II ure. 
Flood stages may be higher or 
lower for a particular event 
depending on hydrologic condi-
tions at time. 
However, overal I 
stages should be considerably lower. 
* -Denotes Items speclfical ly mentioned In Section 122 of Pl 91-61 I. 
e 
e 
PLAN D 
DIVERSION Q-IANNEL 
large f I oods can occur 
exceedIng des lgn capacIty. 
Plan 'should still reduce 
f loodl ng wl thout fall ure. 
Flows are diverted. 
Most 
f I ood I ng shou I d be 
eliminated. 
e 
Plan A - Evacuation 
As noted earlier, this plan provides for the removal of 40 houses from 
the Mon Bijou/Glynn areas. This would remove all damageable property within 
the estimated_S-year flood plain and return the area to a semi-natural state 
with only low intensity use. 
This plan would meet the objectives of reducing 
flood damages by removing damageable property from the flood plain, enhancing 
the environment by restoring part of the flood plain to green areas, 
enhancing recreational opportunities by providing additional open areas for 
public use, and increasing overall safety by removing the more frequently 
flooded homes from the area. There are no known archeological or historical 
sites in the immediate area affected. Therefore, there would not be any 
contribution toward this objective. 
Significant impacts of this plan include the effects on the NED account. 
Benefits to NED would be generated by the reduction in national costs of the 
losses attributed to flooding in the area. 
The current losses for the 40 
houses to be removed are estimated at $3~9,620 annually. 
The removal costs 
necessary to achieve this benefit would be $3.3 million dollars initially, or 
$310,850 on an annual basis. Thus, the net effect on NED would be positive 
as indicated by the net benefit of $29,350 and a benefit to cost ratio of 
1.09. 
Beneficial environmental impacts of this plan, as noted in Table 5, 
would be primarily related to the restoration of the flood plain area through 
the removal of the existing development and creation of green areas. 
Since 
the areas created would not be very large and would be located between two 
residential areas, the overall beneficial impact would be minor. 
There would 
be minor improvement in air quality, water quality, fish and wildlife, and 
esthetics of the area due to the decreased human habitation. 
Adverse 
environmental impacts would mainly be both temporary and minor and associated 
primarily with the construction activities generated by this plan. These 
temporary adverse impacts would be characterized by a decrease in air quality 
and esthetic quality as well as an increase in noise level during the removal 
of the houses. 
One significant non-temporary adverse impact that would 
result from the implementation of this plan is the adverse impact on manmade 
resources due to the removal of the 40 houses. 
Beneficial impacts on Regional Economic Development (RED) would be 
associated with the reduction in flood damages due to changing current land 
use patterns and with the minor increase in construction-related employment 
during implementation of this plan. 
Adverse impacts on RED would be related 
to the removal of 40 houses from the area tax roles and the decrease in eco-
nomic value of the land affected. 
Beneficial social effects would be related to the increase in area 
available for recreation and an increase in the safety and well-being of the 
area residents resulting from the removal of the more frequently flooded 
houses from the area. 
Adverse impacts would be related to the permanent 
displacement of 40 families from the area and the removal of 40 houses from 
the community, thus disrupting the current neighborhood. 
-27-
The implernentability of this plan is indicated by its response to 
certain criteria, i.e., acceptability, completeness, effectiveness, and 
efficiency. This plan is not the most desirable plan from the local 
viewpoint due to the large acquisition of houses involved and the change of 
developed, privately owned land to non-developed, publically owned land. 
The 
plan is complete within itself providing the benefits as stated for the level 
of evacuation specified. It does not offer any improvement for the remaining 
houses in the 100-year flood plain. 
It is however, dependent on sponsorship 
by the local government. 
This plan is effective in reducing the flood 
damages as stated. 
It does not a 1 ter the level of flooding. only the flood 
damage experienced. 
Since those houses evacuated are permanently removed 
from the hazard area, this plan is the most effective in assuring future 
damages are eliminated for these structures. This plan is not the most 
economically efficient plan in that it does not provide the maximum net 
benefits. 
It does, however, provide the maximum net benefits of all the 
evacuation plans considered. 
The sensitivity of this plan can be measured in terms of risk and 
uncertainty. 
Risk can be represented by the probabi 1 i ty that the plan will 
function as proposed and produce the results predicted. 
Uncertainty is an 
indication of the unknown iterns that cannot be predicted but may occur and 
cause unanticipated results. 
InMon Bijou the risks associated with Plan A 
are those related to the houses remaining in the flood plain. These houses 
would still be susceptible to periodic flooding. 
However, this risk is 
neither increased or decreased by implementation of Plan A. 
The uncertainty 
of Plan A relates both to the unknown parameters generating the floods and 
the specific impacts on individuals who are relocated. 
Regarding the unknown 
factors related to flooding, the expected flood levels are based on 
anticipated average conditions. 
However, for any specific event those 
conditions may vary considerably generating either higher or lower flood 
levels. 
Since the stream is normally dry and not gaged, there is no 
correlation data other than randomly observed high water marks. 
However, 
given the overland flow nature of the flooding in Mon Bijou covering a rather 
wide area, significant variations in flood levels are not anticipated. 
Therefore, the expected levels as presented, should be representative of the 
flooding probable in the area. 
The specific impacts on individuals who would be relocated are difficult 
to assess without a very detailed study and personal interview. 
Also, such 
impacts tend to be very time-dependent with the severity of the impact 
varying with the personal situation at time of implementation. 
Therefore, 
there is a large unknown factor involved that produces considerable 
uncertainty in this area. 
However, if this plan is selected for 
implementation, special consideration and arrangements could be made to 
lessen all such impacts. 
Plan B - Culvert Enlargement 
This plan would involve building a new, larger culvert through the upper 
Mon Bijou area as described earlier. This plan would meet the objective of 
reducing flood damages by lowering expected flood levels in the area. 
It 
-28-
would increase safety in the area by reducing the flooding of inhabited 
areas. 
However, this plan would not enhance the environment or recreation 
opportunities of the area. 
Any protection of historical or cultural 
resources would be incidental, related only to the reduction in flood levels 
in the area. 
Signiticant impacts of this plan on the NED account include the 
beneficial effects which would result from the reduction in average annual 
flood damages. 
These would amount to $382,720 annually. 
Adverse effects 
would result from the cost of implementation of this plan. 
The first cost of 
this plan would be $3.7 million which would yield an annual cost of $335,640. 
The net effect on NED would be positive and amount to $47,080 annually with a 
benefit to cost ratio of 1.14. 
Environmental impacts would be mainly adverse though minor. 
Some 
beneficial effects could be expected related to the protection of the manmade 
resources of the area. 
However, most of the remaining impacts would be 
adverse resulting from the construction activity. This would generate 
temporary adverse impacts on noise, air quality, and esthetics during the 
construction phase. 
Long-term, minor adverse impacts on esthetics and 
wildlife could be expected from the creation of the debris basin and diver-
sion channel for Little Fountain Gut. 
Regional economic development (RED) impacts would be beneficial, though 
minor. 
These would mainly stem from the improved economic conditions of the 
area related to the reduction in flood losses. There would be a minor 
increase in tax revenue due to reduced deductions for casualty loss as well 
as a probable increase in property values. There would also be beneficial 
impacts related to a reduction in expenditures for repair of public 
facilities damaged by flooding, as well as a reduction in costs for similar 
public services. 
During the construction phase there would also be a minor, 
though temporary, increase in employment opportunities. Adverse impacts 
would be generated by the local costs of implementation of this plan and the 
temporary disruption of public facilities and services during the 
construction phase. 
Other social effects (OSE) would be mainly beneficial. These would 
relate to the reduction in flooding which would reduce the requirement for 
emergency evacuation and the associated community disruption as well as 
improve the overall health, safety, and general well-being of the community 
as a whole. 
As with Plan A, the implemertability of this plan can be assessed by 
ascertaining its response to certain criteria; namely, acceptability, 
completeness, effectiveness, and efficiency. 
Plan B is generally acceptable 
to the local interests as a means of reducing flooding and associated damage 
in the area. It is complete within itself for achieving the results stated 
requiring only periodic maintenance of the channel work and debris basin. It 
is an effective means of reducing flooding and associated damage by achieving 
an 86% reduction in damage. 
It is an efficient means of reducing damages in 
that benefits exceed costs. 
-29-
In examining the sensitivity of this plan, it should be noted that 
because of the hydraulic change, flood levels are lowered. 
This results in a 
decrease in the risk for flooding of the houses in the area. 
However, there 
is still the risk that large floods will occur, perhaps larger than the 
design capacity of Plan B •• Also, for any given event, flood levels may be 
slightly higher or lower than predicted levels. However, the overall design 
should maintain its integrity and contribute to a significant reduction in 
overall flood levels even though some residual flooding could still be 
expected. 
Therefore, there is some remaining risk associated with exceeding 
the design capacity of Plan B. 
At that point, excess flow would again be 
uncontrolled overland flow and flood the Mon Bijou area. 
A similar rationale can be applied to the uncertainty associated with 
Plan B related to variations in hydrologic conditions at time of event 
occurren~. Under Plan B, flood profiles would still be lower than existing 
conditions. Other items of uncertainty relate to the condition of the 
~edification at time of occurrence. A lack of maintenance of the diversion 
channel or debris basin could result in higher flood levels than design. 
However, under almost any condition, flood levels would still be lower than 
existing. 
Plan C - Open Channel 
This plan would require excavating a new channel through the Mon Bijou 
area, in effect restoring the natural drainageway. 
By restoring the 
drainageway, this plan would lower flood levels in the area thereby meeting 
the objectives of reducing flood damages and improving the safety and well-
being of area residents. There would also be some minor enhancement of the 
area's environment resulting from restoration of the channel area. 
No 
provisions would be included for enhancing recreational opportunities 
primarily due to a lack of local interest. 
As with Plan B, any protection of 
historical or cultural resources would be incidental resulting from reduced 
flooding in the area. 
Significant impacts of this plan are similar to Plan B. 
Beneficial NED 
effects could be expected from reduced flooding in the area. These would 
amount to an estimated $378,320 annually. 
Adverse impacts would result from 
the cost of implementation which would amount to a $3.62 million first cost 
or an annual cost of $330,300. 
This yields net annual benefits of $48,020 
and a benefit to cost ratio of 1.15. 
Environmental impacts of this plan would mainly be related to the 
construction activity and the restoration of the open channel area. 
Beneficial impacts could be expected due to the restoration of the channel 
area which would create a greenway through the housing area. There would 
also be a minor reduction in overall noise level and minor improvement in 
esthetic quality due to the replacement of a part of the developed area with 
·an uninhabited greenway. 
Adverse impacts could be expected during the 
construction period which would be temporary and minor. 
There would be some 
degradation of air quality and esthetic quality during the construction 
activity as well as an increase in overall noise level. These would be 
similar to Plan B. 
-30-
L 
Regional Economic Development impacts under this plan would be similar 
to Plan B. 
There would be beneficial impacts related to the reduced flooding 
and improved economic conditions in the study area. 
Adverse impacts would be 
related to the costs of implementation on local financial resources and the 
impacts related to the relocation of six houses. 
However. overall impacts 
should be beneficial. 
Other social effects would be a mixture of Plans A and B. 
Beneficial 
impacts would result from the reduced flooding which would reduce the need 
for emergency evacuation and enhance safety. area housing. and community 
cohesion. 
Adverse impacts would result from the displacement of those 
living in the houses to be removed from the area. This would cause some 
disruption of the community and create hardships on those directly affected. 
The implementability of this plan is also similar to Plan B. 
Plan C is 
generally acceptable to local interests even though. as with Plan A. there is 
concern over removable of the six houses. 
Plan C is complete within itself 
in that it will reduce flooding and flood damages in the Mon Bijou area once 
implemented. 
Other than minor maintenance. it does not require additional 
action to achieve estimated results. 
Plan C is an effective method for 
reducing flood damages achieving an 85% reduction in average annual flood 
damage. 
The sensitivity of Plan C also reflects a combination of that noted for 
Plans A and B. 
As noted for Plan B. the risk associated with Plan Cis 
considerably less than the risk under existing conditions. 
Flood levels 
which cause damage are still possible under Plan C. 
However. the probability 
of their occurrence for any given level of flooding is significantly reduced. 
The uncertainty of Plan C is also reflected in the unknown conditions related 
to flooding and flood levels as well as specific impacts on those persons 
relocated. 
The uncertainty related to flood levels would be less than Plan 8 
due to the decreased dependent on maintenance of the debris basin and high 
velocity channel. 
Also. the uncertainty related to humanistic impacts would 
be considerably less than Plan A due to the significant decrease in number of 
houses affected. 
Plan D - Diversion Channel 
This plan would require excavating a new channel around the Mon Bijou 
and Glynn areas to divert flood water away from the existing development. 
All flows from Canaan Gut and Little Fountain Gut that enter the upper 
portion of Mon Bijou would be diverted by levee and channel works north of 
the area. 
This plan would therefore greatly reduce the flooding potential 
of the area thus meeting the objectives of reducing flood damages and 
improving the safety and well-being of area residents. 
Due to the construc-
tion effort and creation of the new channel. this plan would not provide any 
-31-
enhancement of the natural environment. 
However, the human environment 
would be significantly improved by the reduction in flooding. 
Again, no 
provisions would be included for enhancing local recreational opportunities. 
Also, any protection or enhancement of historical or cultural resources 
would be incidental resulting from reduced flooding in the area. 
Significant economic impacts of this plan are similar to Plan C. 
Beneficial NED effects could be expected from reduced flooding in the area. 
These would amount to $415,800 annually. 
Adverse impacts would result from 
the cost of implementation which would amount to almost $3.6 million first 
cost or an annual cost of $338,000. This would yield a net beneficial 
effect of $77,800 and a benefit to cost ratio of 1.23. 
Environmental impacts of this plan would be mainly related to the 
construction activity along the bypass route. 
Existing vegetation would be 
destroyed and replaced with an altered landscape and periodically maintained 
channel and right-of-way. 
There would also be minor adverse effects asso-
ciated with the construction activity. These would relate to the temporary 
degradation of air quali~, increased noise level, and impaired esthetics 
of the area. This should cease following completion of construction. 
Regional Economic Development impacts under this plan would be similar 
to Plan C though somewhat more beneficial. 
The reduced flooding and 
improved economic conditions of the area would have a beneficial impact on 
the local economy and financial resources. 
The costs of project implemen-
tation would adversely affect local area financial resources. 
However, as 
with NED, the net effect should be beneficial. 
Other social effects would be related to the reduction in flooding 
which would improve the safety and general well-being of the area resi-
dents. 
The reduction in flooding would also tend to allow an improvement in 
the community by allowing normal appreciation and property improvements. 
This plan would beneficially impact more people than any of the other plans 
considered and avoid most of the adverse effects of the relocation plans. 
The implementability of Plan D is similar to Plan C. 
Plan D is accept-
able to local interests and strongly supported as the most appropriate 
method for reducing flood damages. 
It is complete within itself producing 
the estimated flood damage reduction without requiring additional action. 
Only periodic maintenance would be required to insure proper functioning of 
the work. 
Plan D is the most effective and efficient means for reducing 
flood damages by achieving a 94% reduction in damages and the greatest net 
benefits. 
The sensitivity of Plan D reflects the factors noted before. 
The risk 
associated with Plan D are considerably less than that noted for any other 
plans. Since all flood waters would be diverted around most of the develop-
ment, much of the flood risk is virtually eliminated. 
Only an extremely 
rare event (exceeding SPF) may produce some residual flood damage. 
The 
uncertainty associated with Plan D is considerably less than that of the 
other plans since flood waters would be diverted rather than just lowered. 
-32-
TRADE-OFF ANALYSIS 
In the above evaluation, the impacts of the various plans were sum-
marized. 
In order to arrive at the optimum plan for the Mon 
B~jou area, an 
analysis of the relative differences in the above plans is necessary. 
Then, 
either the best plan from those considered could be selected for implemen-
tation, or the most beneficial features of the various plans could be com-
bined to form a new alternative which maximizes the beneficial effects while 
minimizing the adverse effects. 
In reviewing the four detailed plans considered above, Plan A was shown 
to provide significant beneficial effects in reducing flood damages in the 
area through the removal of the flood prone property. 
Also, there are bene-
ficial, though not significant, impacts on the local area environment 
through the removal of the houses and creation of green belts. 
However, 
there are also adverse impacts on the human resources and community due to 
the removal of the homes from the area and the relocation of these resi-
dents. 
Plan B provided a similar beneficial impact on the reduction in 
flood damages. 
However, it does not provide any improvement of the existing 
natural environment nor does it generate the adverse social effects noted 
above from relocating people. 
Plan C, likewise, provides a similar benefi-
cial economic effect by reducing flood damages. 
However, it also provides 
some enhancement of the environment by the reestablishment of the open chan-
nel and green way through the area. 
This is done at the expense of the 
local community cohesion by removing some houses from the area, although the 
impact is far less significant than Plan A. 
Additionally, Plan C, like Plan 
B does nothing for flooding in the lower Mon Bijou and Glynn areas. 
Plan D has a similar beneficial, though significantly greater impact on 
the economy, due to the protection of a larger area and thus, a greater 
reduction in flood damages. 
It does not provide any enhancement to the 
environment. 
Its social impacts are mainly beneficial resulting from the 
reduction in flooding. 
There would still be some minor adverse impacts 
associated with the relocation of at least 3 houses. 
However, this is 
considerably less than either Plan A or C. 
In analyzing these plans and their relative impacts some trade-offs bet-
ween Plans A, B, and C may be possible to achieve either a more environmen-
tally oriented or socially oriented goal. 
However, trade-offs between Plan 
D and the others do not appear warranted since the features of Plan D fall 
generally outside the directly affected area of the other plans and since 
implementation of Plan D would completely obviate the need for any other 
flood reduction work. 
Therefore, no trade-offs are considered warranted for 
Plan D. 
Likewise, since Plans A, B, and C represent different methods of 
reducing flood damages with other impacts solely dependent on the method 
used to reduce damages, trade-offs between those plans are not considered 
warranted. 
-33-
IDENTIFICATION OF THE NED PLAN 
Consistent with Federal guidelines for water resource development, the 
plan yielding the greatest economic benefits in excess of economic costs, 
consistent with protection of the environment, is designated as the NED 
plan. Based on the above comparative analysis, Plan D is shown to yield the 
greatest net benefit for the area. This plan also achieves these results in 
a manner consistent with protecting the resources of the area. Therefore, 
Plan D is designated as the NED plan. 
PLAN SELECTION 
In reviewing the above assessment and evaluation of the four plans, as 
summarized on Table 5, it becomes apparent that Plan D provides a signifi-
cant reduction in flooding of the area while minimizing the disruption of 
the community. 
As such, it generates overall beneficial effects related to 
the reduction in flooding and associated damages. 
While Plan A achieves a 
similar reduction in flood damage and thus a similar beneficial effect, it 
also requires the removal of 40 houses which significantly increases the 
adverse impacts associated with relocation on the community and its resi-
dents. 
Plan B also achieves a similar significant reduction in flooding and 
flood damages. 
However, it does not require any relocations. Therefore, 
its adverse effect on the community and its residents are minimized. 
However, with Plan B, as noted earlier, there is a higher risk and uncer-
tainty level than with Plan C and D due to the nature of the design, depen-
dence on maintenance, and capacity limitation of the improvement. 
Plan C, 
likewise, achieves a significant reduction in flood damages. 
However, this 
plan, like Plan B, does nothing for flooding in the lower Mon Bijou and 
Glynn area. 
From an economic standpoint, all four plans are feasible solutions to 
the flood problems. Also, given the relative range of net annual benefits 
($29,350 to $77,800), all four plans achieve similar economic efficiency. 
However, since Plan D does yield the highest net benefits, it has been 
designated as the NED plan. 
In light of the above evaluation and assessment and in accordance with 
current planning guidance Plan D, the NED plan, is designated as the 
selected plan. It achieves the highest net economic benefits while mini-
mizing adverse impacts. 
Also, it represents a significant improvement in 
the area as compared to the without project condition that would be 
experienced under the "no action" plan. 
THE SELECTED PLAN 
PLAN DESCRIPTION 
As noted earlier, Plan D, diversion channel, involves the construction 
of a bypass channel around the Mon Bijou and Glynn area. 
The proposed plan 
would be located as shown on Plate 2. 
The main channel would have a grass-
lined trapezoidal section with a bottom width of 75 feet and side slopes of 
-34-
one vertical to three horizontal. The channel work would extend some 6,500 
feet beginning downstream of the Glynn area and extending around the north 
side of the developed area to just above Mon Bijou. Thirty-four gabfon 
drop structures would be provided to reduce velocities and control the 
stream gradient through the area. 
Two new bridges would be required along 
the new channel to maintain existing traffic routes. A levee would be pro- -
vided on the upstream end to divert water into the new channel. 
Right-of-way requirements for this plan include the removal of at least 
three houses from the area. These are located in the lower Glynn area. 
The 
occupants would be given assistance in finding replacement housing elsewhere 
under the provisions of Public Law 91-646. 
The houses would be demolished 
after acquisition. Additional easements would be required where the 
construction right-of-way crossed parts of other properties. 
DESIGN AND CONSTRUCTION 
The design capacity of the bypass channel is based on the 10 year 
discharge at the lower end of the Mon Bijou area, some 3,370 cubic feet oer 
second. This discharge is carried throughout the 6,500 feet length for 
velocity and flow profile determination. 
At the upper end of the diversion, 
the design flow is in excess gf a 100 year event due to the smaller basin. 
Local inflows increase the discharge for a particular event as the flow tra-
vels downstream. 
However, since the diversion crosses into another drainage 
area that does not rejoin the Canaan Gut/Salt River channel until at a point 
below the developed area, this effect will not alter the basic performance 
of the channel in diverting the flow. 
Based on the flow, soil conditions, and type of channel, a design 
maximum discharge velocity was set to establish channel dimensions. 
For the 
design, a discharge velocity of about 6 feet per second was used. 
This 
would provide a channel with a 75-foot bottom width, 3 to 1 side slopes, and 
a 6 foot flow depth. 
Since the flow in the channel is intermittent, 
depending directly on rainfall, vegetative cover in the channel should be 
well established. Also, the short duration of flows should minimize the 
time of potentially scouring flows. 
Therefore, under these conditions scour 
should be minimal. 
In order to control velocities in the stream channel, drop structures 
will be required. The bypass channel drops about 120 feet over its 6,500-
foot length. Since flow will be intermittent and of short duration, gabion-
lined drop structures were selected to provide flow control and grade 
change. 
In all, some 34 structures would be provided, each producing a 3-4 
foot drop. 
Overland flow from Little Fountain Gut will enter the main chan-
nel between drop structures 28 and 29 (Sta. 56+00 and 57+00). 
The channel 
reach between the drop structures would be lined with a gabion mattress for 
a length of about 200 feet. Details of a typical drop structure are shown 
on plate 3. 
-35-
At the upper end where the bypass channel joins canaan Gut a:levee 
would be constructed to help divert flow from the existing channel into the 
new channel. This levee would extend along the new channel for about 400 
feet to insure diversion of tanaaft Gut runoff. This levee would be 
constructed to contain the Standard Project Flood with adequate freeboard. 
A ~pical section is shown on plate 3. 
As noted earlier this plan also includes the construction of 2 new 
bridges. The first would be at Canaan Road near the upstream end of the 
diversion. The.other would be on a local street near the 
lower end of the Glynn area as shown on plate 2. 
If authorized and following completion of any necessary revisions to 
the basic design, detailed plans and specifications would be prepared for 
bid solicitation and construction. Construction would be accomplished under 
contract with supervision by the Corps of Engineers. It is estimated that 
the project could be completed in 12 months. 
A detailed cost estimate for the proposed plan is provided in table 6. 
All work is based on July 1987 price levels, utilizing the FY-88 discount 
rate of 8-5/81 to determine an annualized cost. 
OPERATION AND MAINTENANCE 
Operation and maintenance of the proposed project would require only 
periodic grass cutting of the channel area and occasional repair of any 
eroded or damaged areas. There is no requirement for onsite operation nor is 
any permanent machinery involved, other than during construction. 
In 
addition to mowing, the project would be inspected on an annual basis and 
also following significant events to evaluate performance and condition. 
ACCOMPLISHMENTS 
As noted earlier, this plan would reduce flooding and associated damage 
in the Mon Bijou area. It would enhance the overall health, safety, and 
general well-being of the area residents. It achieves the national goals of 
maximizing contributions to NED consistent with protection of the 
environment. 
The overall impacts of this plan on area attributes and resources are 
noted on table 5. In summary, there would be a net positive effect on the 
NED account due to the excess of benefits over costs resulting in a benefit-
cost ratio of 1.2. There would also be a minor adverse effect on the EQ 
account due to the construction of the bypass channel. The net effect on 
the RED account would also be positive due to the reduced flooding and 
improved economic condition of the area. And, there would be a net positive 
effect on the OSE account due to the increased safety and well-being of Mon 
Bijou residents. 
-36-
TABLE 6 
PROPOSED PLAN 
COST ESTIMATE 
Unit 
Total 
Item 
Unit 
Quantity 
Cost 
Cost 
Channel Work 
Mobilization/Demob 
Job 
1 
L.S. 
$ 
20,000 
Excavation 
C.Y. 
285,000 
2.50 
712,500 
Levee Construction 
C.Y. 
1,500 
1.25 
1,875 
Clearing and Grubbing 
Acre 
25 
1500 
37,500 
Grassing 
Acre 
10 
1500 
15,000 
Gabion Control Structure 
C.Y. 
8,500 
90 
765,000 
Inlet Modifications 
Job 
1 
L.S. 
63,500 
Building Removal 
Job 
3 
2000 
6,000 
Subtotal 
$1,621,375 
Contingencies (20%)+ 
324,275 
Contract Price 
-
$1,945,650 
Engineering and Design/S&A (18%) + 
350,150 
Subtotal 
$2,295,800 
Relocations and Alterations 
Bridges 
2 
L.S. 
$ 605,000 
Utilities 
L.S. 
25,000 
Subtotal 
$ 630,000 
Contingencies (20% +) 
125,000 
Subtotal 
$ 755,000 
Lands and Dama~es 
Right-of-way and Easements 
$ 
307,500 
Residential acquisitions 
150,000 
PL 91-646 
31,500 
Administrative Costs (10% +) 
47,500 
Subtotal 
$ 536,500 
Contingencies (15% +) 
80,000 
Subtotal 
$ 617,000 
TOTAL INITIAL COST 
$3,667,800 
INTEREST DURING CONSTRUCTION 
150,000 
TOTAL INVESTMENT COST 
$3,817,800 
Annua 1 Costs 
Interest & Amortization 
$ 334,600 
(8 5/8% for 50 years) 
e 
Maintenance 
3,400 
$ 
338,000 
TOTAL 
-37-
CULTURAL RESOURCES 
A cultural resources survey was conducted of the proposed project area, 
defined as a corridor approximately 61 meters wide and 2,016 meters long 
(Cultural Resources Survey: 
Mon Bijou, St. Croix, V.I., 1984) (See Plate 
10). This work was accomplished in accordance with the National Historic 
Preservation Act of 1966, as amended (PL 89-665); the Archeological and 
Historic Preservation Act, as amended (PL 93-291); and Executive Order 
11593; and was coordinated with the State Historic Preservation Officer 
(SHPO). 
The results of the survey indicate that although the project does 
include a section of the Upper Salt River Archeological District of the 
National Register of Historic Places, it will not adversely affect any known 
prehistoric sites. 
However, two sites - Glynn and the Lebanon Dam Site -
are located adjacent to the channel and must be carefully avoided during all 
phases of construction. 
In addition, a depression area that may be a signi-
ficant resource was located during the survey, west of the Estate Lebanon 
stock pond. 
Given the proximity of known National Register sites to the 
project area and the identification of a possible cultural resource within 
the corridor, the SHPO concurs with the survey report's recommendation for 
archeological monitoring during construction (letter dated January 25, 
1984). 
A monitor will be present during construction to ensure that signi-
ficant sites are not adversely impacted. 
The construction contractor will 
clean the depression area (previously identified as a potential site) of 
stones to allow the monitor access to examine this area and determine if it 
is a significant site. 
Some concern also exists regarding indirect impacts 
from water discharged by the proposed channel. 
Since the water level and 
velocity will not be increased by the proposed project, no adverse effects 
to downstream sites due to channel construction and operation are 
anticipated. 
MITIGATION REQUIREMENTS 
As discussed above and noted earlier, the selected plan does not 
adversely impact any significant environmental resource in the area. 
Thus, 
no mitigation plan is required. 
However, there are known archeological 
sites in the area and care must be taken to avoid adversely impacting these 
sites. 
At present, there are no known sites that would be adversely 
affected. 
However, if during construction, sites are uncovered by the above 
mentioned monitor appropriate action will be taken as specified in 36 CFR 800 
"Protection of Historic Properties". 
OTHER CONSIDERATIONS 
As noted earlier, Executive Order 11988 requires Federal agencies to 
recognize significant values of flood plains and to consider public benefits 
that would be realized from restoration or preservation of flood plains. 
The four criteria cited earlier provide the basis for determining overall 
plan compliance with the order. 
In this regard, it is noted that the flood 
-38-
plain iri the project area has been greatly. altered by the housing 
development. While the proposed plan ts withtn the flood plain. tt ts 
considered to be tht only practical alternative for implementation. It also 
actually reduces ~he extent of tht flood plain. In this re,ard. fts overall 
effect is to reduct the hazards and rtsks associated with f oods and thus 
_ 
minimize the impacts of floods on safety. health. and the general well-being 
of the area. 
• • 
In ~few of these effects and findings. the proposed plan 1s considered 
to be in full compliance with Executive Order 11988. Additionally. since 
there are no wetlands in the proposed area. the provisions of Executive 
Order 11990 regarding protection of wetland areas, are not considered 
applicable to the proposed plan. 
PLAN IMPLEMENTATION 
INSTITUTIONAL REQUIREM~NTS 
This final report is to be forwarded for further review within the 
Corps of Engineers. 
When and if approved, the project would be placed on 
the national list of projects. awaiting funding. 
When funds become 
available, plans and specifications would be prepared, local interests would 
be asked to sign formal agreements, and a contract then advertised and 
awarded to perform the work. 
Once rights-of-way and easements are provided, 
construction would be commenced under supervision of the Corps. Following 
completion of construction, all project works would be transferred to the 
local interests for operation and maintenance. 
· 
DIVISION OF RESPONSIBILITIES AND COST SHARING 
The implementation of the proposed plan is a joint endeavor by local 
and Federal interests. Thus, responsibilities for implementation are shared 
by each. The Federal Government, through the Corps of Engineers, would be 
the lead agency in plan implementation. 
As such, the Corps would be 
responsible for all design work and engineering, preparation of all 
necessary contract documents, contract award, supervision of construction, 
and assuring project completion. 
However, prior to implementation, local 
interests must enter into an agreement with the United States in accordance 
with Section 103(j) of the Water Resources Development Act WROA) of 1986 
(PL 99-662). Generally, they must agree to provide all lands, easements, 
rights-of-way, relocations, highway bridge alterations, and certain other 
costs associated with the project, as well as operate and maintain the 
project when complete as specified in a Local Cooperation Agreement. 
The 
Act further modified the cost-sharing requirements. Table 7 below shows the 
cost-sharing requirements for the proposed plan under the present cost-
sharing arrangements. It should be noted that all costs for operation and 
maintenance are a local responsibility. Section 103(m) of the Act reduces 
the non-Federal cost-share of a flood control project under an •ability to 
pay" determination. Guidelines for this determination were derived from 
33 CFR Part 241 contained 1n the Federal Register of September 23, 1987. 
-39-
~ev. 4/88 
. 
. 
The Benefits Based F·loor (BBF) of 30 percent and tffictency Factor (lF) of 1 
were utilized as specified in the referenced gutdeltnes. Also. ·Section 1156 
of the WRDA of 1986 waives certain cost-sharing requirements up to szoo.ooo 
for any one project. These cost sharing determinations are reflected tn the 
table below. The local sponsor has expressed the ftnancfal capabtltty to 
••t the non-Federal obltgatfons as shown tn table 7 and ai spectfted tn the 
.Local Cooperation Agreement (LCA). 
TABLE 7 
PROPOSED PLAN 
COST SHARING 
Item 
-
Channel Work 
Relocations 
Land and Damages 
TOTAL 
51 Non-Federal 
Contribution 
Subtotal 
Total 
$2,295,800 
755,000 
617,000 
$3,667,800 
251 Minimum Contribution 
50S Maximum Contribution 
Adjustment for Min. or Max. 
Subtotal 
Section 103(m) Adjustment 
Subtotal 
Section 1156 Adjustment 
TOTAL FIRST COST 
Federal 
$2,295,800 
$2,295,800 
-
183,400 
$2,112,400 
0 
s2.u2,4oo 
+ 455,000 
$2,567,400 
+ 200,000 
$2,767,400 
PUBLIC INVOLVEMENT 
Non-Federal 
$ 755,000 
617,000 
$1,372,000 
+ 183,400 
$1,555,400 
917,000 
1,833,900 
0 
$1,555,400 
-
455,000 
$1,100,400 
-
200,000 
s 900,400 
Throughout preparation of this report close coordination has been main-
tained with the local sponsor, the Public Works Department of the Government 
of the u.s. Virgin Islands, and with other governmental offices, elected 
officials, special interest groups, and individual citizens. 
On May 29, 
1987, the Corps distributed the Draft Detailed Project Report for review and 
comment. 
A list of those receiving the draft report is provided below: 
Federal Agencies 
Environmental Protection Agency 
National Marine Fisheries Service 
Department of Agriculture (SCS) 
-40-
Federal Agencies (Continued) 
National Park Service 
Federal Highway Administration 
u.s. Fish and Wildlife Service 
U.S. Geological Survey 
Territorial Agencies 
Governor of the U.S. Virgin Islands 
Virgin Islands Port Authority 
Department of Conservation and Cultural Affairs 
Virgin Islands Public Relations Office 
Department of Commerce 
Department of Public Works 
Department of Agriculture 
Director of Tourism 
Virgin Islands Housing Authority 
Virgin Islands Urban Renewal Board 
State Historic Preservation Officer 
Office of Coastal Zone Management 
Virgin Islands Planning Office 
On June 30, 1987, a Public Workshop was held at the John H. Woodson 
Junior High School adjacent to the Mon Bijou community on St. Croix. The 
purpose for the workshop which was sponsored by the Public Works Department, 
was for the Corps to present a summary of the flood problems at Mon Bi jou 
and to provide a discussion of the study findings and recommendations. 
Approximately 60-65 people were in attendance at t~ meeting which provided 
an op.portuni ty for the attendees to ask Corps representatfft'S. as well as 
Public Works officials, specific questions related to local concerns and 
issues of the proposed project. 
These concerns focused on the residents• desire to implement flood 
reduction measures without delay. 
The need for safety precautions was 
expressed as several residents were fearful of children playing within short 
proximity of the proposed bypass canal. The requirement for continued 
upkeep and maintenance was similarly stressed. 
The meeting which received local press and television coverage was well 
received by local residents who have long endured disastrous flooding which 
threatened lives and property. The local sponsor has agreed to fulfill the 
requirements of local cooperation as stated within the Local Cooperation 
Agreement between the Department of the Army and the Government of the U.S. 
Virgin Islands. This Letter of Intent and other pertinent correspondence 
can be found in Appendix G of this report. 
CONCLUSIONS 
Based on the analyses presented earlier and the input provided by 
others, Plan D, construction of a bypass diversion channel around the Mon 
Bijou area, appears to be in the best overall public interest and the most 
-41-
feasible plan for implementation. This plan meets designated criteria for 
participation by the Federal Government in improvements for flood control. 
It also conforms to the guidelines for Federal water resource project 
development as provided under Principles and Guidelines. There are no more 
economical plans identified that address the primary study objectives and 
achieve a significant reduction in flood damages for the area. The impacts 
of the proposed plan are deemed beneficial overall and the plan is con-
sidered to be in full compliance with all pertinent environmental statutes 
as well as other Federal laws and directives regarding water resource 
project development. 
For these reasons and in view of the comments received from other 
interested parties, Plan 0 was determined to be the best plan for 
implementation. 
RECOMMENDATIONS 
Therefore, I recommend that the selected plan described in this report 
for flood control at Estate Mon Bijou on the island of St. Croix, U. s. 
Virgin Islands, be authorized for Federal implementation under Section 205 
of the 1948 Flood Control Act, as amended, with such modifications as in the 
discretion of the Chief of Engineers may be advisable at a presently esti-
mated Federal first cost of $2,767,400 subject to cost sharing and financing 
arrangements satisfactory to the President and the Congress. 
This recommendation is made with the provision that, prior to 
implementation, local interests will, in addition to the general requirements 
of law for this ~pe of project, agree to: 
a. Provide, during the period of construction, an amount equal to 
not less than 25 percent of total projects costs for flood control, at least 
5 percent of which will be cash. The Virgin Islands shall receive a waiver 
of $200,000 of its required cost-sharing requirements as specified by 
Section 1156 of Public Law 99-662. This waiver is applicable to the 5 per-
cent contribution and additional cash contributions as may be required. The 
amount to be provided shall include the value or cost of all lands, ease-
ments, right-of-way, and utility and facility alteration and relocations 
necessary for construction and subsequent maintenance of the project 
including suitable borrow and dredged material disposal areas, as may be 
determined by the Chief of Engineers. 
b. Provide all lands, easements and rights-of-way, including 
suitable disposal areas as determined by the Chief of Engineers, necessary 
for construction and maintenance of the project. 
c. Accomplish all relocations and alterations of structures, 
utilities, highways, railroads, bridges (other than railroad bridges and 
approaches), sewers, and related and special facilities determined to be 
necessary for construction of the project; 
d. 
Hold and save the United States free from damages due to the 
construction or operation and maintenance of the project, except for damages 
due to the fault or negligence of the United States or its contractors. 
-42-
e. Maintain and operate all the works after completion in 
accordance with regulations prescribed by the Secretary of the Army. 
f. Publicize flood plain information in the area concerned and 
provide this information to zoning and other regulatory agencies for their 
guidance and leadership in preventing unwise future development in the flood 
plain and in adopting such regulations as may be necessary to prevent unwise 
future development and to ensure compatability with protection levels pro-
vided by the project; 
g. 
To the extent of its powers, prescribe and enforce regulations 
to prevent obstruction of or encroachment on the project that would reduce 
the level of protection it affords or that would hinder operation and 
maintenance; 
h. 
Assume full responsibility for all project costs in excess of 
the Federal cost limitation of $5,000,000; 
i. Fulfill the requirements as specified by the applicable provi-
sions of the Uniform Relocation Assistance and Real Property Acquisition 
Policies Act of 1970 (Public Law 91-646) approved 2 January 1971; and 
j. Comply with Section 601 of Title VI of the Civil Rights Act of 
1964 (Public Law 88-352) and Department of Defense Directive 5500.11 issued 
pursuant thereto and published in Part 300 of Title 32, Code of Federal 
Regulations, in connection with construction, operation, maintenance, and 
rehabilitation of the project. 
The recommendations contained herein reflect information available at 
this time and current Departmental policies governing formulation of 
individual projects. They do not reflect program and budgeting priorities 
inherent in the formulation of a national civil works construction program 
nor the perspective of higher levels within the Executive Branch. 
Consequently, the recommendations may be modified before they are approved 
for implementation. 
C2H~tl Q 
Robert L. Herndon 
Colonel, Corps of Engineers 
District Engineer 
-43-
• 
REPLY TO 
ATIENTION OF 
CESAJ-PD-ES 
DEPARTMENT OF THE ARMY 
JACKSONVILLE DISTRICT, CORPS OF ENGINEERS 
P. 0. BOX 4970 
JACKSONVILLE, FLORIDA 32232·0019 
ESTATE MON BIJOU, ST. CROIX, U.S. VIRGIN ISLANDS FLOOD CONTROL STUDY 
FINDING OF NO SIGNIFICANT IMPACT 
I have reviewed the planning document and the Environmental Assessment 
of the planned action. These documents reflect pertinent data obtained from 
cooperating Federal agencies having jurisdiction by law and/or special 
expertise and from the interested public. 
The concerns applicable to 
whether or not this project would significantly affect the human environment 
are addressed in those documents and are summarized below. 
a. 
No wildlife habitats, wildlife concentrations, or environmental 
properties that sustain and enrich human life would be significantly degraded. 
b. Archeological surveys and coordination with the SHPO provided a 
suitable plan for protecting and preserving cultural resources in the 
project area. 
c. 
No threatened or endangered species'existence would be jeopardized, 
and no critical habitats would be adversely affected. 
I find, based on the above summary, the planned action will not signifi-
cantly affect the quality of the human environment and does not require an 
Environmental Impact Statement. W£ J.L.Q__ 
DATE: 17 December 1987 
Robert L. Herndon 
Colonel, Corps of Engineers 
District Engineer 
ENVIRONMENTAL ASSESSMENT 
ESTATE MON BIJOU, ST. CROIX, V.I., FLOOD CONTROL STUDY 
DECEMBER 1987 
1.00 Project Location: 
A 2.5-square-mile watershed area containing a resi-
dential community about 5 miles west of Christiansted in north-central 
St. Croix, U.S. Virgin Islands. See the attached location maps. 
2.00 Purpose and Need for Project: The Mon Bijou area and the watershed to 
the east, Glynn area, are flow-through areas between Blue Mountain and Mount 
Eagle to the west and Salt River Bay to the northeast. The flow-through 
water is normally contained in Canaan Gut (drains Blue Mountain and Mount 
Eagle) and Little Fountain Gut from elevations exceeding 1,000 feet m.s.l. 
in the mountains through the Mon Bijou/Glynn areas, with elevations ranging 
from 80 to 200 feet m.s.l., to sea level in Salt River Bay. 
Intense rain-
storms in the mountains cause sudden high-volume runoff towards the east 
through Canaan Gut. These flash floods have overflowed into the Mon Bijou 
area three times in the 5 years preceding 1980. These overflows inundate 
over 90 private homes and cause extensive damage. 
Some provision is needed 
to contain and drain these flash floods that will remove this threat to 
human life and private property. 
3.00 Project Plans Coordination: 
The following agencies were consulted 
concerning control measures contemplated, endangered and threatened species, 
environmental concerns, cultural concerns, and fish and wildlife values: 
u.s. Fish and Wildlife Service (FWS), u.s. Department of Agriculture, u.s. 
National Marine Fisheries Service (NMFS), U.S. Environmental Protection 
Agency (EPA), the U.S. Virgin Islands Planning Office, and the U.S. Virgin 
Islands Department of ~onservation and Cultural Affairs. 
4.00 Flood-Control Alternatives: 
4.01 Nonstructural Alternatives. 
a. NS-1. 
Without condition (No Action) Alternative: This alter-
native would allow the periodic flash floods to continue causing damage to 
private and commercial property in the project area. This alternative would 
not meet the study's objective of determining an economical method for con-
taining and drawing off the periodic flash flood waters; therefore, it is 
unacceptable. 
b. 
NS-2. 
Relocation of houses from the flood-prone areas. This 
alternative is not feasible because a replacement community for the moved 
houses with streets and utilities located outside the flood plain would be 
required, and such activities would greatly increase project 'costs. 
c. 
NS-3. 
Establishment of local government flood plain regulations 
{zoning ordinances, building codes, and restrictions). This alternative 
would only prevent flood damages to future homes. 
The existing homes, and 
people living in those homes, would still be subject to periodic flash 
flooding. 
This alternative is, therefore, not feasible. 
d. 
NS-4. 
Flood warning, temporary flood evacuation, and other 
emergency planning would not be an effective response to flash flooding; 
therefore, this alternative would not be feasible. 
e. 
NS-5. 
Flood proofing the existing homes: 
Raising the homes is 
not feasible because of their type of construction {slab-on-grade). Ring 
levees or walls cannot be guaranteed to be overflow or damage-and-collapse 
proof. 
Ring levees or walls would not protect people and property caught 
outside during a flash flood. 
This alternative is, therefore, not feasible. 
f. 
NS-6. 
Relocate residents. This alternative would require the 
purchase, at fair market value, of both lots and buildings, and it would 
require compliance with PL 91-646 {Uniform Relocation Assistance and Real 
Property Acquisition Policies of 1970). 
The total cost of relocating all of 
the families currently living in this flood-prone area into flood-safe and 
adequate dwellings would be acceptable. 
This alternative does offer a 
potentially feasible plan for reducing flood damage. 
4.02 Structural Alternatives {see plates 2, 8, and 9 in the main report). 
a. S-1. 
Construction of a grass-lined bypass channel with 
gabion-lined drop structures north of the flood-prone areas. This alter-
native would provide a bypass for flash-flood waters to the north of the 
flood-prone areas. It appears to be feasible from pertinent economical, 
engineering, environmental, and historical and cultural concerns. 
This 
alternative is the recommended plan. 
b. 
S-2. 
Construction of a bypass channel north of the flood-prone 
areas with the addition of a storage area and dam located at the site of an 
existing, but relatively small, pond. 
This alternative appears feasible 
from engineering and environmental viewpoints; however, dam construction 
would significantly add to project costs, dam construction could damage 
historical and cultural resources (see paragraph 5.03-Lebanon Dam) located 
on the south side of the considered dam site, and the storage area is not 
necessary to accomplish the desired flood control. 
c. S-3. 
Construction of a bypass channel north of the flood-prone 
areas with the addition of a leveed detention area at the downstream end of 
the channel. This alternative appears feasible from engineering and 
environmental viewpoints, but it does not appear feasible from historical, 
cultural, and economic viewpoints. 
The area being considered for the deten-
tion area contains four clusters of aboriginal sites dating back to 100 A.D. 
The area has been nominated for inclusion in the National Register of 
Historic Places and appears to be a valuable archaeological resource. This 
2 
alternative would provide downstream storage and recreation potential; 
however, this additional storage capacity does not appear to be necessary to 
solve the flooding problem. 
d. 
S-4. 
Construction of a bypass channel with the addition of an 
upstream storage area and a downstream detention area (Alternatives S-2 and 
S-3 combined): 
This alternative would be feasible from engineering and 
environmental viewpoints, but the reservations listed in paragraphs b and 
c above would still apply. 
e. S-5. 
Construction of a bypass channel through Mon Bijou along 
an existing drainage ditch route with one entrance channel from the north, 
one entrance channel from the west, and a debris basin between the entrance 
channels and the bypass channel. This alternative would provide a rapid 
bypass for flash-flood waters through the center of the flood-prone areas, 
and it is feasible from the economic, environmental, and engineering view-
points. 
This alternative's location is believed to be in an area of high 
cultural resource sensitivity, therefore, it has the potential of destroying 
valuable historic and cultural resources. 
5.00 Environmental Impacts: 
5.01 The project area has the following ecological characteristics. The 
vegetation is wholly upland grasses and large trees such as Flamboyan 
(Delonix re~ia), Thorn scrub (Acacia), gumbo-limbo (Bursera simaruba), mango 
(Mangitera 1ndica), and tamarindo {Tamarindus indica). There are no wet-
lands in the area of considered flood-control activities. The Salt River 
Bay, northeast of the project area, has valuable mangrove and salt pond 
wetland areas. 
This wetland area receives the freshwater runoff from the 
project area but would not be adversely affected by any of the contemplated 
alternatives. There are no significant habitats, wildlife concen-
trations, or other valuable environmental characteristics in the project 
area. 
5.02 
No critical habitats or threatened and endangered species occur in 
the project area. 
The U.S. Fish and Wildlife letter of June 17, 1987 (copy 
in the correspondence section of the Detailed Project Report) completes the 
requirements of Section Seven of the Threatened and Endangered Species Act. 
5.03 The Virgin Islands State Historical Preservation Officer (SHPO) 
notified the Corps by letter dated 10 December 1982 (copy included in the 
correspondence section of the Detailed Project Report) of the requirement 
for a systematic archaeological survey for any selected construction plan. 
A cultural resources survey (copy on file in the Jacksonville District 
Office) of the S-1 plan corridor concluded that only insignificant effects 
on two of the area's prehistoric archaeological sites (labeled Glynn 1 and 
Lebanon Dam on the cultural resources location map) could be expected as a 
result of the recommended plan. 
The recommended plan includes a pre-
construction survey of a potential archaeological site (depression west of 
3 
the existing pond). 
Effects on any significant cultural or archaeological 
resources uncovered during construction would be avoided, or unavoidable 
damage to such resources would be mitigated. 
Plans S-2, S-3, and S-4 could 
cause significant damage at the Glynn 1 site and/or at the Lebanon Dam site. 
A cultural resources survey has not been performed for Plan S-5, and the 
SHPO has identified the Plan S-5 route as an area of high cultural resource 
sensitivity. A survey would be performed for S-5 if it is selected. The 
selected plan (S-1) is in full compliance with the National Historic 
Preservation Act of 1966, as amended, for the current stage of planning. 
The State Historical Preservation Office has offered to assist in project 
monitoring for the protection of significant deposits located near the pro-
posed channel's corridor and to evaluate possible secondary effects on 
cultural resources located downstream of the proposed construction area. 
5.04 Puerto Rico Coastal Management Program. 
This study is consistent with 
the approved Virgin Islands CZMP, because the planned work and flood control 
effects would not occur in the Virgin Islands Coastal Zone. 
5.05 Flood Plain Management. 
(a) 
The selected plan would occur in a flood plain. 
(b) 
There are no practicable alternatives to the selected plan, and 
the selected plan cannot occur outside the flood plain. 
(c) 
A Public Notice to notify all interested agencies and the general 
public in the study area of the necessity for implementing the Selected Plan 
in the subject flood plain and to request views and comments will be sent 
out before commitment of resources for this work. 
(d) 
The planned action would prevent the flooding of the residential 
and commercial areas in and around Estate Mon Bijou, and no significant 
adverse impacts have been identified. 
No natural and beneficial flood plain 
values would be lost. 
(e) 
No development as a result of flood control in the study area is 
anticipated. 
(f) 
No adverse impacts will occur; therefore, no method to minimize 
adverse impacts will be required. 
(g) 
The Selected Plan is the most responsive to the study's objective 
of providing economical flood control without causing significant environ-
mental damage, and it is consistent with the objectives of Executive Order 
11988 on Flood Plain Management. 
5.06 Protection of fish and wildlife resources. The Contractor shall keep 
construction activities under surveillance, management, and control to mini-
mize interference with, disturbance to, and damage to fish and wildlife 
resources. 
Species that require specific attention along with measures for 
4 
their protection will be listed by the Contractor prior to the beginning of 
construction operations. 
5.07 The relationships of plans to environmental protection statutes and 
other environmental requirements are shown in Table 1. 
The U.S. Soil 
Conservation Service states that this proposal will not adversely affect 
prime or unique agricultural lands; therefore, this proposal does not 
require evaluation for compliance with the Analysis of Impacts on Prime and 
Unique Farmland. 
6.00 The agencies consulted during the preparation of this document are 
listed below: 
Director 
Office of Federal Activities 
EPA, Region II 
26 Federal Plaza 
New York, New York 10278-0012 
Area Supervisor 
National Marine Fisheries Service 
Environmental Assessment Branch 
3500 Delwood Beach Road 
Panama City, Florida 32407-7403 
Director, caribbean Area 
Soil Conservation Service, USDA 
GPO Box 4868 
San Juan, Puerto Rico 00936 
Superintendent 
Virgin Islands National Park 
National Park Service 
Post Office Box 806 
St. Thomas, Virgin Islands 00801-0806 
Territorial Representative 
Federal Highway Administration 
U.S. Federal Building, Room 114 
Veterans Drive 
St. Thomas, Virgin Islands 00801 
Chief 
Environmental Impacts Branch 
U.S. Environmental Protection 
Agency 
26 Federal Plaza, Room 400 
New York, New York 10278-0001 
5 
Honorable Alexander A. Farrelly 
Governor of the Virgin Islands 
of the United States 
Office of the Governor 
Charlotte Amalie, St. Thomas, 
Virgin Islands 00801 
Executive Director 
Virgin Islands Port Authority 
Post Office Box 597 
St. Thomas, U.S. Virgin Islands 
00801-0597 
Office of the Commissioner 
Department of Conservation and 
Cultural Affairs 
179 Altona & Weigunst 
Charlotte Amalie, St. Thomas, 
U.S. Virgin Islands 00801 
Director, Public Relations Office 
Government of the U.S. Virgin Islands 
St. Thomas, U.S. Virgin Islands 00801 
Commissioner 
Virgin Islands Department of Commerce 
Post Office Box 1692 
St. Thomas, U.S. Virgin Islands 
00801-1692 
Commissioner of Public Works 
Government of the U.S. Virgin Islands 
Post Office Box 4400 
St. Thomas, U.S. Virgin Islands 00801 
Regional Director 
U.S. Fish and Wildlife Service 
75 Spring Street Southwest 
Atlanta, Georgia 30303-3309 
Field Supervisor 
u.s. Fish and Wildlife Service 
Caribbean Field Office 
Post Office Box 491 
Boqueron, Puerto Rico 00622-0491 
Virgin Island Housing Authority 
Post Office Box 979 
St. Thomas, U.S. Virgin Islands 
00801-0979 
Chief, Caribbean District, WRD 
U.S. Geological Survey 
GPO Box 4424 
San Juan, Puerto Rico 00936 
Executive Director 
Virgin Islands Urban Renewal Board 
Post Office Box 2295 
St. Thomas, U.S. Virgin Islands 00801 
Mr. William Tobias 
Division of Fish and Wildlife 
Box 1878, Frederiksted 
St. Croix, U.S. Virgin Islands 00840 
Director 
Virgin Islands Planning Office 
Chinnery Building 
129-133 Sub-Base 
St. Thomas, U.S. Virgin Islands 
00801-5000 
Mr. O'Neal A. Abel 
Assistant Commissioner 
Department of Public Works 
Post Office Box H, Christiansted 
St. Croix, U.S. Virgin Islands 00820 
Assistant Commissioner 
Department of Agriculture 
Post Office Box 82 
St. Thomas, U.S. Virgin Islands 
00801-0082 
Director of Tourism 
Post Office Box 1692 
St. Thomas, U.S. Virgin Islands 
00801-1692 
San Juan Area Office 
U.S. Army Corps of Engineers 
ATTN: 
SAJPG 
400 Fernandez Juncos Avenue 
San Juan, Puerto Rico 00901-3299 
State Historic Preservation Officer 
Virgin Islands Planning Office 
Division for Archeology & Historic 
Preservation 
Chinnery Building 
129-133 Sub-Base 
St. Thomas, U.S. Virgin Islands 
00801-5000 
Mr. Benjamin Nazario, P.E. 
Director 
Coastal Zone Managment Division 
Department of Conservation and 
Cultural Affairs 
179 Altona & Weigunst 
Charlotte Amalie, St. Thomas, 
U.S. Virgin Islands 00801 
Mr. Gabriel St. Surin 
Special Assistant 
Department of Public Works 
Government of the U.S. Virgin Islands 
Post Office Box 4400 
St. Thomas, U.S. Virgin Islands 00801 
6.01 A scoping letter (dated September 5, 1984} and a copy of the Draft 
Report and Environmental Assessment with cover letter (dated May 29, 1987} 
were sent to the addressees listed in section 6.00. 
Copies of the letters 
of response are in appendix G of the main report. 
6 
6.02 
Issues raised by letters of response and the Corps' responses are 
addressed below. 
(a) 
U.S. Environmental Protection Agency (EPA) letter dated 
October 18, 1984: 
Any effect on wetlands as a result of this project will 
require application of 404(b)(1) Guidelines. 
Corps' response: 
No wetland areas will be affected by the alternative plans 
being considered. 
(b) 
EPA letter dated August 13, 1987: 
1. 
Information should be provided to support the conclusion that 
the Salt River Bay mangrove and salt pond wetlands will not be adversely 
affected. 
Corps' response: 
The Salt River Bay wetland area now receives the fresh-
water runoff that flows through the project area through the existing chan-
nels (Canaan Gut and Little Fountain Gut) and, when the drainoff water 
volume exceeds these channels' capacity, overland through Mon Bijou. 
The 
proposed flood control measures will only remove the requirement for the 
water to flow overland through Mon Bijou. 
No significant change in the 
volume of water flowing to the wetland will occur, and the only possible 
change in fresh water quality entering the wetland area would be a reduction 
in the amount of domestic pollution picked-up enroute to the wetland area. 
2. 
The clearing of lower channels leading into Salt River Bay 
should be added to the plan as requested in the EPA July 21, 1982 letter. 
Corps' response: The study of any action unrelated to containing and 
draining flood waters from the Estate Mon Bijou area would be beyond the 
scope of this study and, therefore, cannot be added to the plan. 
3. 
Destruction of·soil retention vegetation should be prevented. 
Corps' response: 
No vegetation outside the selected plan's channel align-
ment and immediate work areas would be significantly damaged. 
4. 
Pre-historic sites at Glynn I and Lebanon Dam should not be 
disturbed. 
Corps' response: A cultural resources survey of the selected plan's channel 
alignment concluded only insignificant effects on Glynn I and Lebanon Dam 
would be expected as a result of the plan. 
7.00 Conclusion: This project will not cause a significant impact on the 
human environment, because there are no significant habitats, wildlife con-
centrations, or other valuable environmental characteristics in the path of 
the selected channel route or close enough to be affected by the necessary 
construction activities. 
An Environmental Impact Statement will not be 
required for this project. 
7 
00 
TABLE 1 
RELATIONSHIP OF PLANS TO ENVIRONMENTAL PROTECTION STATUTES AND OTHER ENVIRONMENTAL REQUIREMENTS 
ESTATE MON BIJOU, ST. CROIX, V.I., FLOOD CONTROL STUDY, 1987 
Selected Plan: Construction of a Bypass Channel - Plan S-1 
Plan S-1 
Plan S-2 
Plan S-3 
Plan S-4 
Plan S-5 
Federal Statutes 
Archeological and Historic Preservation Act, as amended, 16 u.s.c. 469, .!!..!!!l.e 
Full 
Full 
Full 
Full 
Non 1! 
Clean Air Act, as amended, 42 u.s.c. 1857h-7, et ~· 
Full 
Full 
Full 
Full 
Full 
Clean Water Act, as amended, (Federal Water Pollution Control Act> 33 u.s.c. 1251, .!!.~· 
Full 
Full 
Full 
Full 
Full 
Coastal Zone Management Act, as amended, 16 u.s.c. 1451, .!!..~· 
N/A 
N/A 
N/A 
N/A 
N/A 
Endangered Species Act, as amended, 16 u.s.c. 1531, .!!...!!!!l• 
Full 
Full 
Full 
Full 
Full 
Estuary Protection Act, 16 u.s.c. 1221, .!!...!!!l.e 
N/A 
N/A 
N/A 
N/A 
N/A 
Federal Water Project Recreation Act, as amended, 16 u.s.c. 4601-(12), .!!...!!!!l• 
N/A 
N/A 
N/A 
N/A 
N/A 
Fish and Wildlife Coordination Act, as amended, 16 u.s.c. 661, et .!!!!l• 
Full 
Full 
Full 
Full 
Full 
Land and Water Conservation Fund Act, as amended, 16 u.s,c. 4601 - 4601-11, .!!...!!!!l• 
Fu II 
Full 
Full 
Full 
Full 
Marine Protection, Research, and Sanctuaries Act, 33 u.s.c. 1401, et .!!!!l• 
N/A 
N/A 
N/A 
N/A 
N/A 
National Envlronmenhl Polley Act, as amended, 42 u.s.c. 4321, et .!!!!l• 
Full 
Full 
Full 
Full 
Full 
National Historic Preservation Act, as amended, 16 u.s.c. 470a, et .!!!!l• 
Fu II 
Fu II 
Full 
Full 
Full 
Rivers and Harbors Act, 33 u.s.c. 401, .!!..!!!!l• 
N/A 
N/A 
N/A 
N/A 
N/A 
Watershed Protection and Flood Prevention Act, 16 u.s.c. 1001, .!!...!!!!l• 
N/A 
N/A 
N/A 
N/A 
N/A 
Wild and Scenic Rivers Act, as amended, 16 u.s.c. 1271, .!!..!!!!l• 
N/A 
N/A 
N/A 
N/A 
N/A 
Executive Order, Memoranda, etc. 
Floodplain Management (E.O. 11988) 
Fu II 
Full 
Full 
Full 
Full 
Protection of Wetlands (E.O. 11990) 
N/A 
N/A 
N/A 
N/A 
N/A 
Analysis of Impacts on Prime and Unique Farmlands (CEO Memorandum, 11 Aug 80) 
N/A 
N/A 
N/A 
N/A 
N/A 
NOTES: 
For each Item listed enter one of the following: 
a. Full Compliance. Having met all requirements of the statute, E.O., or other environmental requirements for the current staQe of planning 
(either preauthorlzatlon of postauthorlzatlon>. 
• 
b. Partial Compliance. 
Not having met some of the requirements that normally are met In the current stage of planning. Partial compliance 
entries should be explained In appropriate places In the report and/or EA and referenced In the table. 
c. Noncompliance. 
VIolation of a requirement of the Statute, E.O., or other environmental requirement. 
Noncompliance entries should be 
explained In appropriate places In the report and/or EA and referenced In the table. 
d. Not applicable. 
No requlr~nts for the Statute, E.O., or other environmental requirement for the current staQe of planning. 
1/ 
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ST. CROIX, U.S. VIRGIN ISLANDS 
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DEPARTMENT OF THE ARMY 
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SECTION ' 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST CROIX, LJ . S VIRGIN I SLANDS 
SELECT-ED PLAN 
BYPASS CHANNEL 
DEPARTMENT OF THE ARMY 
JACKSONVILLE DISTRICT, CORPS OF ENGINEERS 
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SECTION 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX , U.S. VIRGIN ISLANDS 
PLAN DETAILS 
DEPARTMENT OF THE ARMY 
JACI<SONVILLE DISTRICT, CORttS Of' ENGINEERS 
JACKSONVILLE, FLORIDA 
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SECTION 205 
OE:TAIL£0 llf'OJf:CT M~ 
ESTATE MOH IIJOU 
ST. "'OIX , U.S. VlltGIN ISLANDS 
WITH PROJECT PERFORMANCE 
OE:~TMlNT OF THE ARMY 
.IACKIOttVILI.I DISTitiCT, COit .. l Of' I ... INIIItl 
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200' 
0 
200 ' 
400' 
SECTION 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX A 
FLOODED AREA 
MAP 
EXISTING CONDITIONS 
100- YEAR 
DEPARTMENT OF THE ARMY 
JACKSONVILLE DISTRICT CORPS OF ENGINEERS 
JACKSONVILLE FLORIDA 
D.O. FILE NO. 109-34,414 
PLATE 
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WATER SURFACE 
----ELEVATION, FT., M.S.L. 
--WATER SURFACE CONTROL 
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200' 
0 
200' 
400' 
SECTION 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX A 
FLOODED AREA 
MAP 
WITH PROJECT 
100- YEAR 
DEPARTMENT OF THE ARMY 
JACKSONVILLE DISTRICT CORPS OF ENGINEERS 
JACKSONVILLE FLORIDA 
L----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------1----------------------~D~
. O~.~F~IL~E~NQ 109-34 ,4 14 
PLATE 6 
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OETA il£0 PROJeCT RePORT 
ESTATE IIftON BIJOll 
ST. CROIX, U.S VlRGtN tSLA~O.S 
ALTERNATIVE PLAN 
NONSTRUCTURAL PLAN 
OEPARTMENT OF THE .ARMY 
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DETAILED PROJECT REPORT 
SUPPORTING DATA 
FOR 
MON BIJOU 
ST. CROIX, VIRGIN ISLANDS 
The supporting data for the Mon Bijou study is arranged into Appendices 
based on subject matter. 
Each appendix furnishes detailed information on 
the technical aspects of the studies conducted and the plans considered. 
The Appendices are arranged in the following order: 
A - HYDROLOGY AND HYDRAULICS 
-B - GEOTECHNICAL AND MATERIALS 
C - RECREATION ASSESSMENT 
D - ENGINEERING, DESIGN, AND COST ESTIMATES 
E - ECONOMIC ANALYSIS 
F - CULTURAL RESOURCES 
G - LOCAL COOPERATION AND PUBLIC INVOLVEMENT 
SECTION 205 DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX A 
HYDROLOGY - HYDRAULICS 
SECTION 205 DETAILED PROJECT Rf/)RT 
ESTATE MON BIJOU 
ST. CROIX, U.s. VIRGIN ISLANDS 
APPENDIX A 
HYDROLOGY - HYDRAULICS 
TABLE OF CONTENTS 
A. 
INTRODUCTION 
B. 
HYDROLOGY 
Watershed Description 
Previous Hydrologic Studies 
Unit Hydrograph Analysis 
Rai nfa 11 
Design Rainfall 
Results 
C. 
HYDRAULICS 
Existing Conditions 
Study Area 
Hydraulic Model 
Development of the Model 
Hydraulic Design Criteria 
General 
Design Water Surface Profiles 
Channel Characteristics 
Starting Conditions 
Cross Sections 
Transitions 
Roughness Coefficient 
Alignment 
Superelevation 
Freeboard 
Stilling Basin 
Bridges 
Debris Basin 
Drop Structures 
Inlet Structures 
Gabion Drop Structures 
Hydraulic Design of Alternative Plans 
General 
Nonstructural Plan 
Concrete Culvert Plan 
A-i 
PAGE NO. 
A-1 
A-1 
A-1 
A-1 
A-1 
A-3 
A-3 
A-4 
A-5 
A-5 
A-5 
A-5 
A-5 
A-5 
A-5 
A-6 
A-6 
A-6 
A-6 
A-6 
A-6 
A-6 
A-6 
A-6 
A-7 
A-7 
A-7 
A-7 
A-7 
A-8 
A-8 
A-8 
A-ll 
A-1 
A-2 
A-3 
A-4 
A-5 
A-6 
A-7 
A-1 
A-2 
A-1 
A-2 
A-3 
A-4 
A-5 
TABLE OF CONTENTS (Continued) 
Partial Bypass 
Earthen Bypass With Gabion Drop Structures 
Proposed Plan 
Channels 
Main Channel 
Inlet Channel 
Gabion Drop Structures 
Bridges 
LIST OF TABLES 
Summary of Hydrologic Parameters 
Peak Rainfall-Frequency at Mon Bijou 
Summary and Comparison of Discharge 
Average Depths and Velocities for Nonstructural Plan 
Summary of Hydraulic Design Data for Channels 
Summary of Hydraulic Design Data for Inlet Channel 
Surmary of Hydraulic Design Data for Bridges 
LIST OF FIGURES 
Drainage Basins 
Distribution of Discharge and Flow Area at a 
Cross Section -
Existing Condition 
LIST OF PLATES 
(Plates follow text) 
- Flood Profiles 
Flooded Area Map - Existing Conditions - 10-Year Flood 
Flooded Area Map - Existing Conditions - 100-Year Flood 
Flooded Area Map - Existing Conditions - Standard Project 
Main Channel - Hydraulic Design Profile 
A-ii 
PAGE NO. 
A-ll 
A-ll 
A-ll 
A-ll 
A-ll 
A-ll 
A-ll 
A-12 
A-3 
A-4 
A-4 
A-9 
A-13 
A-18 
A-19 
PAGE NO. 
A-2 
A-10 
Flood 
A. 
INTRODUCTION 
1. This appendix presents the basic hydrologic data and studies which were 
conducted to define the hydraulics of Salt River and its main tributaries at 
Mon Bijou, St. Croix, under existing conditions and with various flOod pro-
tection plans in place. 
B. 
HYDROLOGY 
2. 
Watershed Description. 
Mon Bijou is located in north central St. Croix, 
U.S. Virgin Islands, at the foot of Canaan Gut in the upper end of Salt 
River Basin. 
Canaan Gut collects runoff from 440 acres on the steep eastern 
slopes of Blue Mountain. 
This small watershed drops 1,000 feet in elevation 
over a length of 1.6 miles. 
The lateral slopes of Canaan Gut•s V-shaped 
basin are even-steeper; averaging about 35 percent. 
Canaan Gut beqins to 
fan out into a floodolain just above Mon Bijou where it is joined by a 
smaller but similar watershed known as Little Fountain Gut. 
Together they 
comprise a drainage area above Mon Bijou of less than 1 square mile. 
Through Mon Bijou and below, Canaan Gut collects another 0.3 square miles of 
drainage area. 
About 1 mile below Mon Bijou, Canaan Gut is joined by two 
other tributaries. The total drainage area at this junction is 2.45 square 
miles. 
Figure A-1 delineates the drainage basin and subbasins in the study 
area. 
3. Previous Hydrologic Studies. 
A report entitled, "A Flood Damage 
Mitigation Plan for the U.s. Virgin Islands," dated April 1981, was prepared 
by CH2M Hill, an engineering firm in Gainesville, Florida. 
The report was 
prepared for the Disaster Preparedness Office of the Governor of the -Virgin 
Islands. 
In part, the report contains a detailed hydrologic evaluation of 
Salt River Basin, with a view towards providing a bypass channel around Mon 
Bijou. 
4. 
A report entitled, "Flood Insurance Study U.S. Virgin Islands, 
Island of St. Croix," dated April 1980, was prepared by the firm 
Tippets-Abbett-McCarthy-Stratton (TAMS) under contract with the Federal 
Emergency Management Agency. 
The study includes a detailed hydrologic eval-
uation of the Salt River Basin. 
5. Unit Hydrograph Analysis. 
Hydrology of the Mon Bijou area involves the 
determination of peak rates of supercritical flow f~om small basins of less 
than 1 square mile with basin slopes of up to 35 percent. There are no data 
upon which to calibrate a rainfall-runoff model; nor are there any synthetic 
method specifically designed for flash flood analysis in the Virgin Islands. 
In past studies of small basins in Puerto Rico and the Virgin Islands, 
numerous synthetic methods have been used. 
Several of these methods were 
reviewed and the U.S. Soil Conservation Service (SCS) small watershed ap-
proach was selected. The SCS method has widespread acceptance and use and 
has the advantage over some of the other methods, in that it was developed 
for small drainage areas. 
Hydrologic computations were performed with the 
A-1 
MON BIJOU 
SALT RIVER 
DRAINAGE BASIN 
FIGURE 
A-1 
use .of HEC-1 flood hydrograph package. 
Flood routings were accompli shed by 
the modified puls option of HEC-1 from discharge-storage data produced by 
HEC-2 backwater profiles~ Table A-1 lists the hydrologic parameters for 
subbasins in the Salt River basin. 
TABLE A-1 
Summary of Hydrologic Parameters 
DA 
L 
Basin Slope 
Lag 
scs 
Subbasin 
{sg.mi.) 
(mi.) 
% 
Minutes 
Curve # 
#1 Canaan Gut 
• 70 
1.6 
35.0 
16 
83 
2 Little Fountain Gut 
.16 
.95 
31.0 
11 
84 
3 Lebanon Hi 11 
.12 
.50 
20.0 
9 
81 
4 Bonne Esperance 
.54 
1.23 
37.0 
13 
82 
5 Lower Canaan Gut 
.27 
1.08 
7.8 
27 
80 
6 Frieden sfe 1 d 
.59 
1.48 
9.5 
36 
78 
7 
.07 
.40 
2.8 
22 
78 
8 
.36 
1.46 
20.0 
22 
80 
9 
.18 
.53 
5.2 
21 
76 
10 
.29 
1.29 
20.0 
20 
79 
11 
.11 
.59 
8.8 
19 
74 
12 
.38 
1.42 
26.0 
20 
78 
13 
.34 
.66 
6.5 
26 
72 
14 
.43 
.53 
30.0 
17 
72 
6. Rainfall Losses. 
Rainfall losses were accounted for by the SCS curve 
number procedure using antecedent moisture condition II. Curve numbers 
varied between 80 and 84 in the upper basin above Mon Bijou and from 72 to 
80 below the project area. 
7. Design Rainfall. Six-hour design rainfall for 2-year to SPF were 
estimated from isohyetal maps in Weather Bureau Technical Paper No. 42, 
(TP-42), "Generalized Estimates of Probable Maximum Precipitation and 
Rainfall Frequency Data for Puerto Rico and Vir~in Islands." TP-42 contains 
isohyetal maps for duration from 30 minutes to 4 hours. Technical Paper 
No. 25 (TP-25) "Rainfall Intensity-Duration-Freguency Curves" was used to 
distribute the design rainfall into 5-minute increments. TP-25 gives rain-
fall frequency down to 5-minute intervals for various rainfall stations in 
the United States and San Juan, Puerto Rico. 
The depth duration of the 
design storm for the peak 1 hour was patterned after the gauge at San Juan, 
Puerto Rico. 
The distribution of the 5-minute intervals were arranged in a 
critical 11, 9, 7, 5, 3, 1, 2, 4, 6, 8, 10, 12 order. Table A-2 lists peak 
rainfall rates for various return periods. 
A-3 
TABLE A-2 
Peak Rainfall-Freguency at Mon Bijou 
Return Period (years) 
Duration 
2 
5 
10 
25 
50 
100 
SPS 
5-minute 
.32 
.42 
.51 
.62 
.72 
.81 
1.26 
1-hour 
2.0 
2.6 
3.1 
3.8 
4.4 
5.0 
7.7 
6-hour 
3.6 
4.7 
5.7 
6.9 
8.0 
9.0 
14.0 
8. Results. Table A-3 lists the discharge frequency at two locations along 
Canaan Gut. 
Also shown are the results of the two previous studies. 
The 
TAMS study used the same SCS small watershed method with SCS curve number 
techniques. 
The primary different between the TAMS study and the analysis 
in this report is in the rainfall distribution and time intervals. 
TAMS 
used 30-minute computation intervals compared to a 5-minute computation 
interval used in this study. 
The study by CH2M Hill used an empirical lag 
equation (Lag= .65A•403), and 10-minute computation intervals. 
The lag 
equation compared reasonably well with the SCS method on all but the 
extremely steep subbasins. 
TABLE A-3 
Summary and Comparison of Discharges (CFS) 
At Confluence of Canaan Gut and Little Fountain Gut, DA = 0.86 sq. mi. 
This study 
TAMS 
CH2MHill 
10-year 
1,830 
1,441 
1,700 
At Bottom of Canaan Gut DA 
2.45 sq. mi. 
This study 
TAMS 
CH2MHill 
Note: 
NA means Not Available. 
10-year 
4,110 
NA 
3,650 
A-4 
50-year 
100-year 
SPF 
2,840 
3,270 
5,390 
2,538 
3,150 
NA 
2,390 
2,790 
NA 
50-year 
100-year 
SPF 
6,560 
7,605 
12,803 
NA 
NA 
NA 
5,330 
6,280 
NA 
C. 
HYDRAULICS 
Existing Conditions. 
9. Study Area. 
The study area consists of the 4,400-foot reach of 
Canaan Gut and Salt River which passes through the residential areas of 
Glynn and Mon Bijou. 
The primary cause of flooding in the residential area 
is due to construction infringement into, and in some areas total elimina-
tion of, the natural floodway of Salt River. 
The principal hydraulic 
feature in the area is a 700-foot-long, 4-foot by 6-foot concrete box 
culvert in the west end of Mon Bijou. 
This culvert is the sole means of 
conveying flows from upstream runoff through the area. 
The limited capacity 
of the culvert is usually further reduced by debris blockage. 
As a result, 
flood flows sweep over the low culvert headwall into the streets and houses 
of Mon Bijou before reentering the natural watercourse downstream. 
Flooding 
is further aggravated by the minimal capacity of a 2-foot by 4-foot highway 
culvert located about 200 feet upstream ef the residential area and by 
runoff from Little Fountain Gut, a tributary, to the north passing 
uncontrolled over the main highway into houses and streets in the northwest 
portion of Mon Bijou. 
10. 
Hydraulic Model. 
Water surface profiles were developed for existing 
condit1ons us1ng the Hydrologic Engineering Center HEC-2 Computer Program 
"Water Surface Profiles." This program was developed to calculate subcriti-
cal and supercritical water surface profiles in natural or manmade channels 
of any cross section for steady gradually varied flow. 
The computational 
procedure is based on the solution of the one dimensional energy equation. 
This method applies Bernoullis Theorem for the total energy at each cross 
section and uses Manning's formula to determine the frictional head loss 
between cross sections. This procedure is generally known as the Standard 
Step Method. 
11. 
Development of the Model. 
The HEC-2 hydraulic model was formed using 
19 cross sect1ons from aerial topography flown in January 1983. 
The 
topography had a scale of 1 inch equals 50 feet with 2-foot contour inter-
vals. 
Mean high water of 0.2 feet, msl, was used as a starting condition in 
Sugar Bay at the mouth of Salt River. 
Manning "n" values were calibrated 
from the flood of October 8, 1977, which was estimated to be a 25-year flood 
in the study area. 
Verified Manning's "n" values varied from 0.055 to 0.095 
for the main channel and 0.100 to 0.300 for overbank areas. 
This model was 
then used to develop 2-, 5-, 10-, 25-, so-, and 100-year and Standard 
Project Flood Profiles using hydrologic data previously discussed. 
The 
existing condition hydraulic profiles are shown on plate A-1 and flooded 
areas are shown on plates A-2, 3, and 4 for the 10 year, 100 year, and 
Standard Project floods, respectively. 
Hydraulic Design Criteria. 
12. 
General. 
Hydraulic design criteria and procedures used herein are in 
accordance with standard engineering practice and applicable provisions of 
Corps Engineering Manuals and the Waterways Experimental Station "Hydraulic 
Design Criteria" relative to design and construction of Civil Works Projects. 
A-5 
Engineering criteria adopted to meet special local conditions are in accor-
dance with that previously approved for similar projects. 
13. 
Design Water Surface Profiles. 
The most significant factor affecting 
design criteria of the water surface profiles is that Estate Mon Bijou lies 
directly in the path of the Salt River watercourse with minimal capacity for 
flood flow conveyance in the culvert under the development. 
Because of 
this, primary consideration was given to diversion plans to minimize impacts 
on local residences, highways, bridges, and utilities. 
14. Channel Characteristics. 
The below listed criteria were used in the 
analysis of various plans involving channel modification. 
a. Starting conditions. 
Flow downstream of the study area is predomi-
nantly subcritical. The starting condition for downstream considerations 
was an elevation of 0.18 feet, msl, in Sugar Bay, which is the mean high 
tide, with back water computations extending upstream to the junction of the 
bypass design with the natural channel. 
b. Cross Sections. 
The most efficient hydraulic section was used to 
convey flows in-bank for the design flood within geologic constraints of 
side slope stability, maximum allowable velocities and maximum depth of 
economic excavation. 
c. Transitions. Transitions would be provided at all changes in 
channel geometry. 
d. 
Roughness Coefficient. Manning's "n" values of 0.013, 0.030, and 
0.035 were used for concrete, gabion, and earthen sections, respectively. 
e. Alignment. 
The design alignment would minimize the required real 
estate acquis1tions and conform to minimum radius criteria outlined in 
"Hydraulic Design of Flood Control Channels," EM 1110-2-1601. 
f. Superelevation. 
Invert banking would be provided for all curved 
concrete channels in conjunction with spiral transitions to insure flow 
stability and minimize the total rise in water surface between the channel 
center line and outside wall. 
g. 
Freeboard. 
A minimum freeboard allowance of 1 foot above the 
design water surface elevation was used as a basis of setting the top of 
channel elevation. 
h. Stilling Basin. 
The stilling basins were designed to contain the 
change of flow regimen. 
Hydraulic design of the stilling basins conform 
with standard design criteria and procedures established in Engineering 
Manuals EM 1110-2-1601, "Hydraulic Design of Flood Control Channels," EM 
1110-2-1602, "Hydraulic Design of Reservoir Outlet Structures," and EM 
1110-2-1603, "Hydraulic Design of Spillways." 
A-6 
i. Bridges. 
Bridges were analyzed to insure acceptable flow charac-
teristics in terms of acceptable net velocities, flow stability, and flow 
depth. 
In areas of subcritical flow, piers having semicircular nose and 
tail were designed to not restrain this net flow area by more than 10 per-
cent. 
In areas having supercritical flow, bridges were required to be full 
span. 
Bridge low chord was set to be a minimum of 1-foot above the design 
water surface elevation. 
j. Debris Basin. 
A leveed debris basin would be required at the 
upstream end of the project for concrete channel alternatives. For this 
study, the required basin was sized based on a drainage area proportion com-
pared to those used for the Portugues and Bucana Project in Ponce, Puerto 
Rico. 
Detailed designs of debris basins would include consideration that a 
major flood event could occur almost any time of the year and annual sedi- : 
ment yields could reach the project in one event with little or no sediment 
the remainder of the year. Consideration would also be given to sediment 
gradation to insure that gravels and cobbles would not damage concrete_ 
lining and stilling basins. 
k. Sheet Pile Drop Structures. 
The 12 drop structures used in the 
earthern bypass alternative plan were designed in accordance with criteria 
set forth in EM 1110-2-1601, Hydraulic Design of Flood Control Channels, 
Appendix III, plate 43. 
This criteria was limited to design head of 6 feet 
for sheet pile weir construction in accordance with procedures used for 
grade stabilization structures in the Tennessee Tombigbee project. Sheet 
pile CIT type drop structures having a height of 10 feet were considered as 
an alternative plan; however, the total initial cost of $5,100,000 was not 
economically justified. 
1. Inlet Structures. 
Inlet structures would be provided for some 
alternat1ves at ex1st1ng inflow points. These structures would consist of 
corrugated metal pipe culverts with stoplog risers to control inflow into 
the canal. 
The structures would be designed to convey runoff during a 
10-year storm with entrance and exit losses totaling 1.69 times the velocity 
head and barrel friction based on Manning's formula with an "n" value of 
0.024. 
m. 
Gabion Drop Structures. The 34 gabion drop structures used in the 
proposed plan were designed in accordance with criteria set forth in ETL 
1110-2-194, Gabion Channel Control Structures. 
Hydraulic Design of Alternative Plans. 
15. General. 
Of the four plans presented in the plan formulation portion 
of the ma1n report, three structural plans and one nonstructural plan were 
found to be implementable. 
Hydraulic design considerations of the four 
plans follow. 
A-7 
16. 
Nonstructural Plan. This plan consists of purchasing those residential 
propert1es located within the 5-year flood plain and relocating the residents 
elsewhere. 
Use of this measure would reduce flood damages to the most often 
flooded residences. 
Howe~er, flooding will continue. 
Flow velocities and 
water depths, after project implementation, in the overbank areas and near 
the channel are of great concern, therefore, HEC-2 computer model analysis 
for a variety of flood flows in these areas were performed and the results 
are presented in table A-4. 
The primary consideration in applying steady 
flow theory to the calculation of water surface profiles in natural rivers 
involves converting hydraulic parameters, which are distributed across 
complex sections, into averages. 
The flow velocity, which is required to· 
apply the energy equation, must be a representative average velocity for 
each cross section. The theory is applied by subdividing each cross section 
into separate portions, or subsections, as shown in Figure A-2. 
The velo-
city within each subsection (V in FPS) is equal to the discharge (Q in CFS) 
·divided by the area (A in square feet). 
For example, the velocity in the 
right overbank (ROB) area is equal to QROB/AROB. 
Average velocities and 
water depths from several cross sections of the study area were taken from 
the HEC-2 model output and are shown in table A-4. 
These are an indication 
of average velocities and water depths in the overbank areas. 
A-8 
TABLE A-4 
- AVERAGE DEPTH AND VELOCITIES FOR NONSTRUCTURAL PLAN 
Cross Section Frequency 
Average Depth 
Average Velocity 
Average Velocity
Sector 
From 
To 
Flood 
Overbank (Ft.) Overbank ( FT /S) 
Near Channel 
1 - D/S Glynn 
11.20 
12.20 
2 Yr 
0.30 
0.05 
4.40 
10 Yr 
2.20 
0.40 
6.50 
100 Yr 
3.10 
0.50 
8.00 
2 - Glynn 
12.20 14.10 
2 Yr 
0.20 
0.05 
5.80 
10 Yr 
1.80 
0.10 
7.20 
100 Yr 
2.90 
0.10 
9.00 
3 - Glynn to 
Park 
14.10 15.10 
2 Yr 
0.10 
0.04 
5.70 
10 Yr 
1.80 
0.10 
8.50 
100 Yr 
3.00 
0.10 
10.50 
4 - U/S Glynn 
15.10 17.02 
2 Yr 
0.10 
0.04 
7.20 
10 Yr 
1. 70 
0.10 
10.30 
100 Yr 
4.70 
0.10 
13.50 
A-9 
FIGURE A-2 
DISTRIBUTION OF DISCHARGE AND FLOW AREA (A) 
AT A CROSS SECTION 
LEFT OVERBANK 
MAIN CHANNEL 
RIGHT OVERBANK 
(LOB) 
(MCH) 
(ROB) 
ws 
QMCH 
,, \\.' 
/lr \.'-
AMCH 
DEPTH 
QLOB 
QROB 
ALOB 
AROB 
"', \. , ..... 
A-10 
17. 
Concrete Culvert Plan. This plan considered passing flood flows through 
the western part of t~on B1jou and would limit flood protection to the most 
damage prone area. 
In order to minimize impacts on local real estate, a 
channel design was based on slope controlled supercritical flow in a rec-
tangular section. The channel would be about 1,125 feet long including a 
stilling basin near the downstream end and a gabion channel transition back 
to natural stream conditions. 
The covered concrete section would be about 
461 feet long. 
A debris basin was located upstream of Mon Bijou in such a 
manner as to include runoff from Canaan Gut, the mainstream, and also Little 
Fountain Gut, a tributary north of the study area. The debris basin would 
keep rocks and abrasive material from entering the concrete channel and 
would serve as a check dam to insure stable conditions entering the concrete 
channel. 
18. 
Partial Bypass. 
This plan included constructing a bypass channel 
parallel to the main north road and then through the residential area of Mon 
Bijou. 
The bypass would be about 2,300 feet long using a trapezoidal 
gabion-lined channel, designed for velocity control and using single, and 
double staged sheet pile drop structures. This plan would also require a 
standard project flood levee to protect the northern part of the i>'lon Bi jou 
area. 
19. 'Earthen Bypass With Gabion Drop Structures. This plan considered a 
bypass channel north of the residential areas of Mon Bijou and Glynn using 
a trapezoidal earthen channel designed for velocity control and using 34 
gabion drop structures. 
Proposed Plan. 
20. 
Channels. 
a. 
Main Channel. 
The main channel would be about 6,500 feet long and 
have a trapezoidal grass-lined section with a 75-foot bottom width. 
At the 
downstream end, the channel would transition to natural stream conditions. 
A summary of hydraulic design data for the main channel is shown in table 
A-5 and a profile is shown on Plate A-5. 
b. 
Inlet Channel. 
This inlet channel would be about 350 feet long and 
have a trapezoidal grass-lined section with a 30-foot bottom width. 
A 
summary of hydraulic design data is shown in table A-6. 
c. Little Fountain Gut Inflow. 
Overland flow from Little Fountain Gut 
will enter the main channel between drop structures No. 28 and No. 29. 
The 
channel reach between the drop structures would be lined with gabion 
mattress. 
This channel reach would be about 200 feet long. 
21. 
Gabion Drop Structures. Thirty-three gabion drop structures were used 
along the bypass channel and one drop structure for the drainage Area No. 4 
inlet channel in order to minimize channel erosion by controlling the effec-
tive gradient. 
These 34 structures were sized to pass the design discharge 
A-ll 
with the concurrent design headwater and tailwater elevations. 
The 33 
bypass channel structures would have a crest length (L) of 101 feet and a 
crest height (He) of 4.39 feet. 
Plate 3 of the main report shows a plan 
detail of the gabion drop structures. A crest height (He) of 4.39 feet was 
selected in order to have a total head loss ( H) of 3.0 feet at this struc-
ture. 
Reference is made to plate 2 and 3 of ETL 1110-2-194, a unit 
discharge (q) of 30 cfs/foot will correspond to a gross head on crest (H) of 
4.5 feet. 
From plate 2, tailwater depth (h) relative to crest is equal to 
1.5 feet (H- H). 
Then, with a tailwater depth of 5.89 feet minus (h) it 
will give an (He) of 4.39 feet. 
The remaining drop structure for the Area 4 
inlet channel was scaled down as indicated in parentheses on plate 3 of the 
main report. 
22. 
Bridges. 
Bridge sizes were developed to insure hydraulic efficiency 
based on net area provided below the design water surface elevation. 
Bridges in subcritical flow areas were designed to have a semi-circular nose 
and tail on piers. 
A summary of hydraulic design data for bridges is 
provided on table A-7. 
A-12 
)> 
I 
1-' 
w 
e 
Station 
0+00 
2+00 
2+60 
4+00 
4+60 
7+00 
7+60 
11+20 
11+80 
14+00 
14+60 
17+40 
18+00 
19+60 
20+20 
----· 
Width(FT)I 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
... 
75 
e 
TABLE A-5 
SUMMARY OF HYDRAULIC DESIGN DATA FOR CHANNELS 
Water 
Surface 
Elevation 
Invert 
(FT. MSL) 
( FT) MSL 
60.8 
54.9 
61.1 
55.2 
64.6 
58.7 
66.0 
60.1 
69.0 
63.1 
69.2 
63.3 
72.2 
66.3 
73.0 
67.1 
76.0 
70.1 
77 .o 
71.1 
80.0 
74.1 
81.0 
75.1 
84.0 
78.1 
84.2 
78.3 
87.2 
81.3 
Side Slopes 
Left Right VELOCITY 
DISCHARGE 
1 on 
1 on 
( FT /S) 
DEPTH (FT) 
(CFS) 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3,371 
3 
3 
6.1 
5.9 
3'~371 
-·--- --
-----
e 
LINING 
COMMENTS 
Junct1on w/Salt 
Grass 
River 
Ta 11 water Drop 
Structure # 1 
Heactwa ter Drop 
Structure # 1 
1 a11 water urop 
Structure # 2 
Headwater Drop 
Structure # 2 
Ta1lwater Drop 
Structure # 3 
Heactwa ter Drop 
Structure # 3 
Tallwater Drop 
Structure # 4 
Headwater Drop 
Structure # 4 
Ta 1 1 water Drop 
Structure # 5 
Headwater Drop 
Structure # 5 
1a11water urop 
Structure # 6 
Heactwa ter Drop 
Structure # 6 
Ta 11 water Drop 
Structure # 7 
Heaawa ter Drop 
Structure # 7 
Table Continued 
Next Page 
)> 
I ...... 
.p. 
e 
Station 
20+60 
21+60 
22+20 
23+80 
24+40 
24+80 
25+60 
26+20 
27+60 
28+00 
29+20 
29+80 
31+00 
Width(FT) 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
Water 
Surface 
TABLE A-5 
SUMMARY OF HYDRAULIC DESIGN DATA FOR CHANNELS 
(Continued) 
• 
Side Slopes 
Elevation 
Invert 
Left Right VELOCITY 
DISCHARGE 
(FT. MSL) 
(FT) MSL 
1 on 
1 on 
( FT /S) 
DEPTH (FT) 
(CFS) 
87.2 
81.3 
3 
3 
6.1 
5.9 
3,371 
87.4 
81.5 
3 
3 
6.1 
5.9 
3,371 
90.4 
84.5 
3 
3 
6.1 
5.9 
3,371 
91.4 
85.5 
3 
3 
6.1 
5.9 
3,371 
94.0 
88.1 
3 
3 
6.1 
5.9 
3,371 
94.5 
88.6 
3 
3 
6.1 
5.9 
3,371 
95.0 
89.1 
3 
3 
6.1 
5.9 
3,371 
98.0 
92.1 
3 
3 
6.1 
5.9 
3,371 
98.2 
92.3 
3 
3 
6.1 
5.9 
3,371 
101.2 
95.3 
3 
3 
6.1 
5.9 
3,371 
102.0 
96.1 
3 
3 
6.1 
5.9 
3,371 
105.0 
99.1 
3 
3 
6.1 
5.9 
3,371 
105.2 
99.3 
3 
3 
6.1 
5.9 
3,371 
--- ·-
-
-
-
-
-
-
-
-- -
--
e 
LINING 
COMMENTS 
Grass Bridge No. 1 
Ta11water Drop 
Structure # 8 
Heaawa ter Drop 
StruCture # 8/ 
Junction W/ 
Inlet Channel 
Ta 11 water Drop 
Structure # 9 
Heaawa ter Drop 
Structure # 9 
Grass Bridge No. 2 
1a11water Drop 
Structure # 10 
Headwater Drop 
Structure # 10 
1a11water urop 
Structure # 11 
Headwater Drop 
Structure # 11 
Ta 11 water Drop 
Structure # 12 
Headwater urop 
Structure # 12 
Ta 11 water Drop 
Structure # 13 
e 
):> 
I ..... 
(.]1 
e 
Station 
31+60 
32+80 
33+40 
34+60 
35+20 
36+40 
37+00 
38+00 
38+60 
40+00 
40+60 
41+40 
42+00 
43+00 
43+60 
Width(FT) 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 ---
Water 
Surface 
e 
TABLE A-5 
SUMMARY OF HYDRAULIC DESIGN DATA FOR CHANNEL 
(Continued) 
Side Slopes 
Elevation 
Invert 
Left Right VELOCITY 
DISCHARGE 
(FT. MSL) 
(FT) MSL 
1 on 
1 on-
(FT/S) 
DEPTH (FT) 
(CFS) 
108.2 
102.3 
3 
3 
6.1 
5.9 
3,371 ' 
109.0 
103.1 
3 
3 
6.1 
5.9 
3,371 
112.0 
106.1 
3 
3 
6.1 
5.9 
3,371 
112.2 
106.3 
3 
3 
6.1 
5.9 
3,371 
115.2 
109.3 
3 
3 
6.1 
5.9 
3,371 
116.0 
110.1 
3 
3 
6.1 
5.9 
3,371 
119 .o 
113.1 
3 
3 
6.1 
5.9 
3,371 
119.2 
113.3 
3 
3 
6.1 
5.9 
3,371 
122.2 
116.3 
3 
3 
6.1 
5.9 
3,371 
123.0 
117.1 
3 
3 
6.1 
5.9 
3,371 
126.0 
120.1 
3 
3 
6.1 
5.9 
3,371 
126.1 
120.2 
3 
3 
6.1 
5.9 
3,371 
129.1 
123.2 
3 
3 
6.1 
5.9 
3,371 
130.0 
124.1 
3 
3 
6.1 
5.9 
3,371 
133.2 
127.1 
3 
3 
6.1 
5.9 
3,371 
e 
LINING 
COMMENTS 
Headwater Drop 
Structure # 13 
Ta1lwater Drop 
Structure # 14 
Headwater Drop 
Structure # 14 
Ta 11 water Drop 
Structure # 15 
Headwater Drop 
Structure # 15 
Ta1lwater Drop 
Structure # 16 
Heactwa ter Drop 
Structure # 16 
Ta1lwater Drop 
Structure # 17 
Headwater Drop 
Structure # 17 
Ta 11 water Drop 
Structure # 18 
Headwater Drop 
Strli'Cture # 18 
ra11water urop 
Structure # 19 
Headwater Drop 
Structure # 19 
Tailwater Drop 
I 
Structure # 20 
Headwater Drop 
Structure # 20 
)> 
I 
1-' 
O"l 
Station 
44+60 
45+20 
46+00 
46+60 
47+60 
48+20 
49+20 
49+80 
50+60 
51+20 
52+20 
52+80 
53+80 
e 
Width(FT) 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
Water 
Surface 
1/-\0LI:.. /-\-:> 
SUMMARY OF HYDRAULIC DESIGN DATA FOR CHANNEL 
(Continued) 
Side Slopes 
Elevation 
Invert 
Left Right VELOCITY 
DISCHARGE 
(FT. MSL) 
(FT) MSL 
1 on- 1 on-
( FT /S) 
DEPTH ( FT) 
(CFS) 
133.2 
127.3 
3 
3 
6.1 
5.9 
3,371 
136.2 
130.3 
3 
3 
6.1 
5.9 
3,371 
136.2 
130.3 
3 
3 
6.1 
5.9 
3,371 
139.2 
133.3 
3 
3 
6.1 
5.9 
3,371 
139.5 
133.6 
3 
3 
6.1 
5.9 
3,371 
142.5 
136.6 
3 
3 
6.1 
5.9 
3,371 
142.7 
136.8 
3 
3 
6.1 
5.9 
3,371 
145.7 
139.8 
3 
3 
6.1 
5.9 
3,371 
146.0 
140.1 
3 
3 
6.1 
5.9 
3,371 
149.0 
143.1 
3 
3 
6.1 
5.9 
3,371 
150.0 
144.1 
3 
3 
6.1 
5.9 
3,371 
153.0 
147.1 
3 
3 
6.1 
5.9 
3,371 
153.2 
147.3 
3 
3 
6.1 
5.9 
3,371 
e 
LINING 
COMMENTS 
Ta11water Drop 
Structure # 21 
Headwater LJrop 
Structure # 21 
1a11water urop 
Structure # 22 
Headwater Drop 
Structure # 22 
Ta 11 water Drop 
Structare # 23 
Heaawa ter urop 
Structure # 23 
Ta1lwater Drop 
Structure # 24 
Headwater Drop 
Structure # 24 
Ta1lwater Drop 
Structure # 25 
Headwater Drop 
Structure # 25 
Ta1lwater Drop 
Structure # 26 
Heaawa ter Drop 
Structure # 26 
Tailwater Drop 
Structure # 27 
e 
)> 
I 
t-' 
....... 
e 
Station 
54+40 
55+40 
56+00 
57+00 
57+60 
58+60 
59+20 
60+00 
60+60 
61+40 
62+00 
63+00 
63+60 
64+60 
Width(FT) 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
75 
Water 
Surface 
e 
TABLE A-5 
SUMMARY OF HYDRAULIC DESIGN DATA FOR CHANNEL 
(Continued) 
Side Slopes 
Elevation 
Invert 
Left Right VELOCITY 
DISCHARGE 
(FT. MSL) 
(FT) MSL 
1 on 
1 on 
(FT/S) 
DEPTH (FT) 
(CFS) 
156.2 
150.3 
3 
3 
6.1 
5.9 
3,371 
156.5 
150.6 
3 
3 
6.1 
5.9 
3,371 
159.5 
153.6 
3 
3 
6.1 
5.9 
3,371 
160.2 
154.3 
3 
3 
6.1 
5.9 
3,371 
163.2 
157.3 
3 
3 
6.1 
5.9 
3,371 
163.7 
157.8 
3 
3 
6.1 
5.9 
3,371 
• 
166.7 
160.8 
3 
3 
6.1 
5.9 
3,371 
167.0 
161.1 
3 
3 
6 .• 1 
5.9 
3,371 
170.0 
164.1 
3 
3 
6.1 
5.9 
3,371 
170.2 
164.3 
3 
3 
6.1 
5.9 
3,371 
173.2 
167.3 
3 
3 
6.1 
5.9 
3,371 
173.5 
167.6 
3 
3 
6.1 
5.9 
3,371 
176.5 
170.6 
3 
3 
6.1 
5.9 
3,371 
177.0 
171.1 
3 
3 
6.1 
5.9 
3,371 
e 
LINING 
COMMENTS 
Headwater Drop 
Structure # 27 
Ta 11 water Drop 
Structure # 28 
Headwater Drop 
Gabion 
Structure # 28 
1 a 11 water Drop 
Gab ion Structure # 29 
Headwater Drop 
Structure # 29 
Ta11water Drop 
Structure # 30 
Headwater Drop 
Structure # 30 
Ta 11 water Drop 
Structure # 31 
Headwater Drop 
Structure # 31/ 
Bridge No. 3 
Ta 11 water urop 
Structure # 32 
Headwater Drop 
Structure # 32 
Ta 11 water Drop 
Structure·# 33 
Headwater Drop 
Structure # 33 
Trans1 t1on to 
Natura 1 Stream 
:J> 
I 
1-' 
00 
e 
Station 
23+00 
23+75 
24+00 
25+25 
Width(FT) 
30 
30 
30 
30 
TABLE A-6 
SUMMARY OF HYDRAULIC DESIGN DATA FOR INLET CHANNELS 
Water 
Surface 
Elevation 
Invert 
(FT. MSL) 
(FT) MSL 
91.4 
87.4 
91.8 
87.8 
94.3 
90.3 
94.9 
90.9 
Side Slopes 
Left Right VELOCITY 
1 on- 1 on-
(FT/S) 
3 
3 
7.0 
3 
3 
7.0 
3 
3 
7.0 
3 
3 
7.0 
e 
DISCHARGE 
DEPTH (FT) 
(CFS) 
4.0 
1,179 
4.0 
1,179 
4.0 
1,179 
4.0 
1,179 
LINING 
COMMENTS 
Junct10n Wl th 
Grass Main Channe 1 
1a11water 
Gabi on Control 
Grass 
S true ture No. 34 
Heaawater 
Gabion Control 
Grass Structure No. 34 
Up stream 
Terminus & 
Transition to 
Grass Natura 1 Stream 
e 
)> 
I 
....... 
\0 
• 
Bridge 
Name 
No. 1 
No. 2 
-------
Station 
Design WSEL 
(Ft.) 
(FT. MSL) 
20+60 
87.20 
60+60 
170.00 
-----·---
e 
e 
TABLE A-7 
SUMMARY OF HYDRAULIC DESIGN DATA FOR BRIDGES 
APPROACH CHANNEL 
Max. Allow Vel. Min. Reqd. 
Bottom 
Bottom 
Min. Area 
Design Q 
Thru Bridge 
Low 
Width 
Elev. 
Side 
Reqd. Thru 
(CFS) 
(FT/S) 
Chord 
(FT) 
(FT. MSL) Slopes 
Bridge ( FT2) 
3,371 
6.00 
88.20 
75.0 
81.30 
1 on 3 
506 
3,371 
6.00 
171.00 
75.0 
164.10 
1 on 3 
506 
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SECTION 205 
DETAILED PROJECT REPORT 
. ·-r· :···-:. :~-; · 
~ · 
~T 
FLOOD PROFILE 
·. -·----.11.· :'_···· 
·5t: 
' .. .. 
i'··-·-·-·--·1 
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DEPARTMENT OF THE ARMY 
.y:· 
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JACKSONYILLEDISTIIttCT,COitltSO,.ENGINEl .. 
.JACKSONYILLR, ,-LORIDA 
DISTANCE UPSTREAM OF CROSS 
,-ILE NO. 10.-14,414 
PLATE 
A-1 
\ " 
e 
e 
e 
LEGEND 
FLOODED AREA 
WATER SURFACE 
....-----ELEVATION, FT., M.S.L. 
40.2 
~WATER SURFACE CONTROL 
N 
1 
GRAPHIC SCALE 
200' 
0 
200' 
400' 
SECTION 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX A 
FLOODED AREA 
MAP 
EXISTING CONDITIONS 
10- YEAR 
DEPARTMENT OF THE ARMY 
JACKSONVILLE 
DISTRICT CORPS OF ENGINE ERS 
JACKSONVILLE FLORIDA 
D. O. FILE NO. 109-34, 4 14 
PLATE A- 2 
e 
l 
e 
e 
LEGEND 
I 
I FLOODED AREA 
WATER SURFACE 
40.2 ....----ELEVATION, FT., M.S.L. 
~WATER SURFACE CONTROL 
N 
t 
GRAPHIC SCAL E 
200' 
0 
200' 
40 0 ' 
SECTION 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPEN DI X A 
FL OODED AREA 
MAP 
EXISTING CONDITIONS 
100- YEAR 
DEPARTMENT OF THE ARMY 
.JACKSONVILLE DISTRICT CORPS OF ENGINEERS 
JACKSONVILLE FLORIDA 
D. O. FILE NO. 109-34,4 14 
PL ATE A-3 
e 
l 
e 
e 
LEGEND 
I 
I FLOODED AREA 
WATER SURFACE 
---ELEVATION, FT., M.S.L. 
40.2 
~WATER SURFACE CONTROL 
N 
t 
GRAPHIC SCALE 
200' 
0 
200' 
400 ' 
SECTION 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX A 
FLOODED AREA 
MAP 
EXISTING CONDITIONS 
SPF 
DEPARTMENT OF THE ARMY 
.JACKSONVILLE DISTRICT CORPS OF ENGINE ERS 
.JACKSONVILLE FLORIDA 
D.O. FILE NO. 
109-3!i~ 4 1 4 
PLATE A-4 
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EXISTING GROUND 
DESIGN WATER SURFACE 
DESIGN INVERT ELEVATION 
MINIMUM REQUIRED tEVEE GRADE 
...L 
60+00 
....L 
50+00 
_L 
40+00 
STATION (FT) 
....L 
30+00 
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SECTION 
20~ 
OETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
WITH PROJECT PERFORMANCE 
DEPARTMENT OF THE ARMY 
..IACKSONVILLI DISTitiCT, COit~S 0, IENGINIEEitS 
JACKSONVILLE, 'LOitiDA 
"LI NO. JOe- 14,414 
PLATE 
A-5 
SECTION 205 DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX. U.S. VIRGIN ISLANDS 
APPENDIX B 
GEOTECHNICAL AND MATERIALS 
A. 
B. 
c. 
D. 
E. 
B-1 
B-2 
B-3 
B-4 
• 
B-5 
B-6 
SECTION 205 DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX B 
GEOTECHNICAL AND MATERIALS 
TABLE OF CONTENTS 
INTRODUCTION 
LOCATION AND PHYSIOGRAPHY 
GEOLOGIC HISTORY 
INVESTIGATIONS PERFORMED 
Core Borings 
Materials Encountered 
Groundwater 
Laboratory Testing 
SOILS ENGINEERING ANALYSES AND CONSIDERATIONS 
Levee 
Levee Foundation Materials 
Dewatering 
Levee Fill Materials 
Levee Design Slopes 
Stability Analysis 
Slope Protection 
Levee Consolidations - Settlement 
Channel 
Channel Excavation 
Dewatering 
Channel Design Slopes 
Gabion Drop Structures 
Foundation Materials 
Gabion Fill 
Bridges 
LIST OF PLATES 
(Plates follow text) 
Vicinity and Location Maps 
Regional Geologic Map 
Legend - Regional Geologic Map 
Core Boring Locations Map 
Core Boring Logs 
Hole No. CB-VIM-1 
CB-VIM-2 
B-i 
PAGE NO. 
B-1 
B-1 
B-1 
B-1 
B-2 
B-2 
B-2 
B-2 
B-2 
B-2 
B-2 
B-2 
B-2 
B-3 
B-3 
B-3 
B-3 
B-3 
B-3 
B-3 
B-3 
B-4 
B-4 
B-4 
B-4 
TABLE OF CONTENTS (Continued) 
LIST OF PLATES (Continued) 
(Plates follow text) 
B-7/B-8 
CB-VIM-3 
B-9 
CB-VIM-3B 
B-10/B-11 
CB-VIM-4 
B-12 
CB-VIM-5 
B-13 
CB-VIM-6 
B-14/B-15 
CB-VIM-7 
B-16 
CB-VIM-8 
B-17 
CB-VIM-9 
B-18/B-19 
CB-VIM-10 
B-20/B-21 
CB-VIM-11 
B-22/B-23 
CB-VIM-12 
B-24/B-25 
CB-VIM-13 
B-26 
CB-VIM-14 
B-27 
CB-VIM-15 
B-28 
CB-VIM-16 
B-29 
CB-VIM-17 
B-30 
CB-VIM-18 
B-31 
Laboratory Test Results Summary 
Gradation Curves 
B-32 
CB-VIM-1 
B-33 
CB-VIM-2 
B-34 
CB-VIM-3 
B-35 
CB-VIM-4 
B-36 
CB-VIM-5 
B-37 
CB-VIM-6 
B-38 
CB-VIM-7 
B-39 
CB-VIM~B 
B-40 
CB-VIM-9 
B-41 
CB-VIM-10 
B-42 
CB-VIM-11 
B-43 
CB-VIM-12 
B-44 
CB-VIM-13 
B-45 
CB-VIM-14 
B-46 
CB-VIM-15 
B-47 
CB-VIM-16 
B-48 
CB-VIM-17 
B-49 
CB-VIM-18 
B-50 
Plan-Soil Profile 
B-ii 
TABLE OF CONTENTS {Continued) 
LIST OF PLATES {Continued) 
(Plates follow text) 
Stability Analyses 
B-51 
Slope Stability - Levee- End of Construction 
B-52 
Slope Stability - Channel - End of Construction 
B-53 
Slope Stability 
Channel - End of Construction 
• 
B-iii 
A. 
INTRODUCTION 
1. This appendix presents the geotechnical investigations and tests which. 
were conducted to define the geotechnical conditions at Mon Bijou, St. Croix, 
U.S. 
Virgin Islands. 
B. 
LOCATION AND PHYSIOGRAPHY 
2. The island of St. Croix is the largest of the three u.s. Virgin Islands. 
The island is 23 miles long from east to west and from 1 to 6 miles wide. 
The areal extent is given as 80 square miles. 
The bank on which the island 
stands is, however, 35 miles long and in places, 20 miles wide. 
Location 
and vicinity maps are shown on plate B-1. 
3. The hills of St. Croix are composed largely of igneous rock and rise 
abruptly from the northern shore (highest point is Mt. Eagle, 1,165 ft.). The 
hills give way to fertile rolling lands, lagoons, and beaches to the south. 
The mean annual temperature of St. Croix is 74 oF and has an average rainfall 
of 45.7 inches yearly. 
C. 
GEOLOGIC HISTORY 
4. The Virgin Islands and their bank continue the geology of Puerto Rico 
for another 100 miles eastward to the point where the Antillean geanticline is 
pinched off and the Anegada fault trough goes down to a maximum depth of 7,120 
feet. 
Forty miles to the southeast, the limestone-covered Caribbe.s begin. 
To 
the south of the Virgin bank, and between it and St. Croix, is a fault trough 
28 miles in width, and about 15,000 feet deep at its maximum. 
The island of 
St. Croix, with its bank, is about 35 miles long; it is an isolated part of 
the Antillean geanticline, both island and bank having the same northeast-
southwest trend (about N. 70 oE.). 
The strike of the rocks on the Virgin 
bank, however, has two different trends, that of the late Cretaceous being 
northwest-southeast, while the Younger Series trends about east-west. 
5. The basement of the Virgin and St. Croix islands is a very thick mass 
of essentially volcanic materials like that of Puerto Rico; it has thin fossil 
zones that are of late Cretaceous (Gosau) time, and younger intrusives, all of 
which are more or less intensely folded and fault~d. The dioritic intrusives 
are most common in the eastern islands. 
The older formations together make up 
the Mount Eagle series. Epeirogenic elevation in Eocene time amounted in the 
west to 750 feet, with a further rise of 500 feet in the early Oligocene; 
toward the east these elevations descend rapidly. 
6. Unconformably over the old basement rocks on the southern side lies the 
Kingshill series of marine sediments having a thickness of at least 600 feet 
and representing the time from the middle Oligocene into the middle Miocene. 
Their deposition was followed by renewed epeirogenic elevation combined with 
block faulting on a tremendous scale. This differential movement began late 
B-1 
in the Miocene and endured through most or all of Pliocene time, bringing on 
the present geography and the overdeepened submarine topography. 
See plate 
B-2 for a regional geologic map. 
D. 
INVESTIGATIONS PERFORMED 
7. 
Core Borings. 
Eighteen (18) core borings (CB-VIM-1 thru CB-VIM-18) 
were drilled along the proposed bypass alignment plan. The borings were 
drilled to depths of 20-35 feet. 
The unconsolidated materials and softer 
rock were sampled by standard penetration tests (1-3/8-inch I.D. x 2-inch 
O.D. split spoon wi~h 140-pound hammer falling 30 inches). 
Rock was sampled 
using 4- x 5 1/2-inch diamond bits. All materials recovered from core 
borings (exclusive of samples used for testing) were placed in core boxes, 
sealed, and stored at the Corps of Engineers• San Juan Area Office. 
Core 
boring locations are shown on plate B-4 with core boring drilling logs shown 
on plates B-5 through B-30. 
8. 
Materials Encountered. 
Materials encountered consisted of layers of 
firm to very stiff silts (ML, MH), firm to hard clays (CL, CH), firm to very 
dense sands (SM, SC) and firm to very dense silty, clayey gravels (GM, GC). 
All borings terminated before encountering hard rock. 
Plate B-50 shows soil 
profile along the proposed levee and channel alignments. 
9. 
Groundwater. 
Groundwater was encountered in borings immediately 
upstream, downstream and east of the in-place earthen.dam located approxi-
mately midway of the bypass alignment plan. The groundwater was generally 
8-12 feet below the ground surface and followed ground surface contours. 
The groundwater table fluctuates; therefore, groundwater elevations shown on 
the borings are only indicative of conditions at the time the borings were 
taken. 
10. 
Laboratory Testing. 
Laboratory tests (visual classification, moisture 
content, atterburg limits, and gradation analysis) were performed on repre-
sentative samples of overburden materials. 
Laboratory tests results and 
gradation curves are shown on plate B-31 through B-49. 
E. 
SOILS ENGINEERING ANALYSES AND CONSIDERATIONS 
11. 
Levee. 
a. 
Levee Foundation. 
(1) 
Materials. 
The materials along the proposed levee alignment 
appear suitable for levee foundation materials. The levee will be founded 
on firm to very dense sands and gravels and very stiff silts. 
(2) 
Dewatering. 
No dewatering of the levee foundation is 
anticipated. 
B-2 
b. 
Levee Fill Materials. 
The levee will be constructed of those 
materials requ1red to be excavated from the channel. 
The excavated 
materials will consist of firm to very stiff silts (ML, MH), firm to hard 
clays (CL, CH), firm to very dense sands (SM, SC), and firm to very dense 
silty, clayey gravels (GM, GC). 
Moisture contents for the excavated · 
material ranges between 6% to 51%, however, the majority of the silty 
clayey materials are within, or close to, maximum moisture-compaction limits 
which are 19% (ML), 17% (CL), 36% (MH), and 25% (CH). 
These materials 
should be suitable for levee fill materials. Levee fill materials will be 
required to be compacted to 95 percent of standard maximum density. 
c. Levee Design Slopes. 
(1) 
Stability Analyses. 
Slope stability analyses were per-
formed for a levee-foundatlon section in conjunction with a channel excava-
tion section at boring CB-VIM-2. 
Slopes at this location were considered to 
be typical levee slopes. Material shear strengths used were based on 
· 
material type and blow counts from standard penetration tests. Slopes were 
analyzed for end of construction conditions. 
Flooding conditions are of 
short duration with steady seepage conditions and slope saturation with 
rapid drawdown condition unlikely to occur; therefore, stability analyses 
for these conditions were not performed. 
Slopes were analyzed for both 
wedge and circular arc failures (UTEXAS2 Computer Program). 
Factor of 
safety obtained was 4.51 (end of construction conditions). 
Slope stability 
analyses indicate stable levee slopes of lV to 2.5H. 
Levee slope stability 
analyses are shown on plate B-51. 
(2) 
Slope Protection. 
Gabions (12" thick) will provide slope pro-
tection in the vicinity of the drop structures. Seeding and natural grass, 
which takes over quickly, should provide adequate slope protection for all 
other slopes. 
d. 
Levee Consolidation - Settlement. The maximum height of the levee 
will be approximately 4 feet with levee materials compacted to 95 percent of 
standard maximum density and constructed on firm to very stiff foundation 
materials, therefore, little to no consolidation-settlement is expected 
during and after levee construction. 
12. Channel. 
a. 
Channel Excavation. 
Maximum channel excavation depth will be 
approximately 30 feet. 
Channel excavation materials will consist of firm to 
very stiff silts (ML, MH), firm to hard clays (CL, CH), firm to very dense 
sands (SM, SC), and firm to very dense silty, clayey gravels (GM, GC). 
Groundwater is generally below channel excavation grade exclusive of the in-
place earthen dam area. 
No rock excavation will be required. 
Excavation of 
materials can be made with conventional excavation equipment. 
B-3 
b. 
Channel Design Slopes. 
Slope stability analyses were performed 
for channel excavation sections near borings CB-VIM-6 and CB-VIM-11. 
Slopes at these locations were considered to be the critical and maximum 
channel excavation slopes. Material shear strengths used were based on 
material type and blow counts from standard penetration tests. Slopes were 
analyzed for end pf construction stability conditions. 
Flooding conditions 
are of short duration with steady seepage conditions and slope saturation 
with rapid drawdown conditions unlikely to occur; therefore, stability ana-
lyses for these conditions were not performed. 
Slopes were analyzed for 
both wedge and circular arc failures (UTEXAS2 Computer Program). 
Factors of 
safety obtained were 2.29 (end of construction) at boring CB-VIM-6 and 1.52 
(end of construction) at boring CB-VIM-11. 
Slope stability analyses indi-
cate stable excavation slopes of 1V to 3H. 
Excavation slope stability ana-
lyses are shown on plates B-52 and B-53. 
13. 
Gabion Drop Structures. 
a. 
Foundation Materials. 
Foundation materials for the gabion drop 
structures along the proposed bypass alignment plan are of sufficient den-
sity to provide adequate structure support. 
The gabions should be underlain 
by filter fabric to prevent intrusion and piping of fine foundation material 
from beneath and into the gabion drop structures. 
b. 
Gabion Fill. Fill for 
having a un1t we1ght of 165 pcf 
inches (Guide Spec. CW-02541). 
duce concrete aggregate will be 
materials. 
14. 
Bridges. 
gabion drop structures should be stone 
(SSD) well graded between 4 inches and 8 
It is anticipated local quarries which pro-
able to provide suitable gabion fill 
The local sponsor is responsible for all permanent bridge crossings. 
No temporary bridges should be needed during construction. 
B-4 
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LOCATION MAP 
~ 
SECTION 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX 8 
VICINITY AND LOCATION MAPS 
DEPARTMENT OF THE ARMY 
JACKSONVILLE DISTRICT, CORPS. OF ENGINEERS 
JACKSONVILLE, FLORIDA 
D.O. FILE NO. 109·34,414 
PLATE: A·l 
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SECTION 20S 
. 
OETAIL£0 PROJECT REP<>f'T 
ESTATE MON BIJOU 
ST. CROIX, U.S • . VIRGIN ISLANDS 
APPENDIX 8 . 
REGIONAL GEOLDGIC MAP 
DEPARTMENT OF THE ARMY 
.IACKSONVILL~ DISTRICT, CORPS OF E:NGINEERS 
JACKSONVILLE, FLORIDA 
FILE NO. 10.-54,414 
PLATE S-2 
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s.m ... tary ..,_ta, IIMivicw 
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tA.ZI, ••rl, ~~ 
.. tte, GM clar; GU -'""'i•l, l•u•u.. k.cA, .,",..· .... ,. 
MClrtA, GM .,..., ~ 
G 
Sedimentary and voleanic reeka, _. .... 
In Puerto Rico; ftlteron•, tattdtt.N, CO"flo_.,..,., .Z,.Z ,.,... 
eron., lava, ttif/, larg•lv dtpoeittd in a -",.. lttftr.,.t!Mttt, 
mer include eonu pluronic attd lavdrot~r .,..,...., tWb 
attd tom• etrata of Crltac•oue Clfl; in Vir,itt .W.U., ...,, 
quarlz·attduite and a-ugit•·andttitf br•ccia attd ttiff...., 
Ia~ 
and mccia 
Plutonic rocka 
In Pwerto Rico, Vilq"''· and Cultbra, larg•lv grafiOdionu au 
q"artz diontt, eo me diorite, quartz porpAvrv, gabbro, •tiC 
toMt smpAibolitt; in Virgin leland•, predominantlr eo...lit.l, 
toMt •U.tl tv,ff, ,..,,_tit., la.mproplavr• dibe, attd didul; 
klwM ro "'" bun tmplaced during Late CretCICIOVI, 
Pal.e~N, •tiC EocMe 
Voleanie and Mdimentary roeka, uMiyided 
Ttiffaclttt~,l M~, 
tiltltottl, br•ccica, •*' c"floMtrt~tl,lava, 
ttif/, tOMI li11tutonc a"d flttubro"c; l•r1•lv dcpotitcd it~ G 
11tarine lttvirOR*'"t; ,.., ittelucl• ""'' AvdrotA•rJII4llv 
alttrcd rock• at&d IOMI •tr•t& •I PsilOCIN au (or) Eoceflc 
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S.rpentiniz•d peridotite(?); probablytmpla.ced duri"fl tAl 
Early or early Lat. Creta.c1DU1 
Volcanic and S,edimentary rocka, undivided 
Tuff. tuflaceoue breccia, rome 1a11d1ttme, rilt1tone, at~d li•· 
rwn.; in Puerto Rico, lava, lava breccia, BOMI amplt.ibolit.l 
and laydroth.•rmally altere4 rocke; in Virgi1t lela1ttl1, klr4· 
toplt,yre and spitite flow•, volcanic wac/us, IIU1it4-attdetite 
breccia, radiolarite, at&d 10?11# CO"'lo'"*rllte; lt~rrelr U~d 
in a marin. envirOR-Nnt; m«JV i1tcludc -.ome 1tratfJ. of Lat. 
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SolWI it~ ea-ri,.. sr•., kted · 0t1 etiemic datG.. 
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wl&trc eztra,ol4ttd; dotutl wl&ere epeculated batH 0t1 to,Jef· 
rapAr G"tl magNtic gradu"t' ••d tr•ue; querild wwe 
doubiftd or i'4ferred. 
0 or ticltt, iuic•te u-tAro- lfM; 
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Not klit••d ro '"•olv• be~,.,.,"t. 
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f"* creet 
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MoiiOClinal.flelture 
1'4ferr•d t"nd of monocline it~volving tub-bottom Aoriz0t11 of 
V f"Czutla.n batin along eoJdla margin of MUI1'UI• Trot4gh. 
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7rlt&d of ,.,ftdtlal1JlGIMtic MIOmalV ,,.,.,..,~ + 15{) gamm~~~ 
SECT~ 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX B 
LEGEND- REGIONAL GEOLOGIC 
DEPARTMENT OF THE ARMY 
JACKSONVILLfj DISTRICT, CORPS OF ENGJ.NEERS 
JACKSONVILLE, FLORIDA 
FILE NO. 109• 34,414 
PLATE B-3 
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CORE BORING LOCATION AND NUMBER 
CI·VIM-2 
NOTE: 
_PROfiOSED L£YEE J..OCATIQfiAfl) ALIGNMENT 
_PROPOSED CHANNEL LOCATION AND AUGNMENT 
I. FOR CORE BORING ORILLI!lG LOGS SEE PLATES 
S-5 .THRU 8-30. 
·· · 
2. FOR PLAN-SOIL PROFILE,SEE PLATE B-50. 
SECTION 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST CROIX, U.S. VIRGIN ISLANDS 
APPENDIX B 
CORE BORINGS LOCATION MAP 
DEPARTMENT OF THE ARMY 
JACKSONVILLE DISTRICT, CORPS. OF ENGINEERS 
JACKSONVILLE, FLORIDA 
D.O. FIL£ NO.IOI-54,414 
PLATE 8-4 
Hole No CB- VIM-1 
~IVISION 
INSTALLATION 
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SOUTH ATLANTIC 
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12. MANUP'ACTUIIER'I OIESIGNATIOM OF OR ILL 
L ORILLINQ AORNCY 
CME 45B 
(Hollow stem auger-drilling) 
GEO CIM 
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11.. TOTAL MO. OF OVER~ 
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IIUROO:N IAM .. LI!I TAKI!N, 
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FLOR RIVERA 
... o:Lo:v•Too• ""ou•o wATI!" Not ·encountered 
L DI .. IECTION OF MOLl! 
f1TAIIITCD 
1 cow.-LaTao 
IXJvaiiiTICAL QINCLINIEO 
... DATE HOLlE 
h0-24-83 
ll0-24-63 
D& •• P'IIIOM V&lltT. 
7. THICKNESS OF OVI!R.UROE:N Greater than 20 ft. 
1?. I!LO:VATION TOP 0~ HOU 175.fi1 ft. 
18. TOTAL CCMIIE RE:COVI:fV' FOR IIORING 
72%, 
il. DE~TM OfiiiLLEO INTO ROCK 
No rock drilled 
... SIGNATURI! 0~ INI .. ECT~/ '~ 
1-· TOTAL DEPTM OF NOLIE 20ft. 
Guillermo Abudo 
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CLAIIIP'ICATIOII OF MATUUALS 
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in %. 
,. 
174.11 . - '/ /' 
1, 
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140# ham-
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ROCK FRAGMENTS, subangular 
2 ~- 17 11.5 ~er with 
-
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to subrounded, some fine 
8 
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30" drop 
3-= 
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V,:. 
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= 
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2 ft. long 
-
3 
8 
19 9.7 f.l it SJDOn 
4-= ; 
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% 
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4 r-12--t 34 9.2 
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15 
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= 
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% 
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= 
5 f-ll.-; 41 
7-= 
*Unified Soils Classifica-
7.5 = 
tion symbol and legend 
% 
32 
-
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reflect lab test data % 
r-E-
8-= 
results. 
6 r-!2-- 37 B.8. 
= 
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= 
9 
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1-
5.3 
w-= 
Silty CLAY, little fine 
7 
.ll 
28 
.-
~ 
sand, hard, yellowish brown 
17 
10.5= 
% 
mixed olive dark brown ;,:. 
14 
n-= 
stains, trace rock 
= 
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fragments (CL). 
8 
18 
41 
1as 
-
% 
23 
12-= 
= 
;,:. 
9 
-
~ 
9 
16 
34 
13.3 
13-= 
I 
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18 
I 
13.5= 
% 
14 ...:::. t% 
;.:: 
12 
! 
i 
= 
10 
14 
31 
16.7 
-
17 
I 
-
15 
-
" 
16a.GI 
~ 
z 
10 
= 
ROCK FRAGMENTS, some silty 
11 
17 
38 
15.8 
-
clay lumps, little fine 
16-= 
~ 
sand, medium, light olive 
% 
21 
16.5 = 
brown (GC). 
lZ 
1? 
-
7-= 
12 
16 
43 
18.3 
= ~ 
27 
-
' 
8-:: 
% 
7 
v.: 
16 
= 
13 
42 
83 
2.5 
-
~9 -: v; 
18 
-
15:i.!;l ffi : 
% 
65 
EHG FORM 18 36 
Pii':EVIOUS EDITIONS Ail':£ O.SOLETE. 
PRO~ECT ESTATE MON BIJOU, 
I HOLE-NO. -
(TRANSLUCENT) 
ST. CROIX, USVI 
CB VIM 1 
MAR 7f 
PLATE B-5 
Hole No CB- V U1-2 
I
OIVISIOH 
DRILLING LOG 
SOUTH ATLANTIC 
INSTALLATION 
ISH£.'[ T 
JACKSONVILLE 
o• 1 
.~ .... 1 
1. ~"OJIECT 
10. '""AND TYP£ o• e1T ( 1-3/i'"lDxZ''OD soli t -;oor4 
Ir-Es;-;-.. 
' A,.T,.;E;ru;f·10,N=B:::I::::J::O::-U-::· :-;S::T::;.::;-C_RO_I_X_:, __ 
u_sv_I ____ ., 11. DAl u• '""' ~ .. u~' OUft >Hu• 
.... ~ ..... , 
. ~~1T:8'~c,Tc\',r-., ·~"'1t:574 
f1SL 
12. MANUP'ACTU"IIR'S DESIGNATION OP' DRILL 
CME-458 Hollow stem auqer drilling 
J,. DRILLING AGCNCY 
GEO CIM 
INC. 
&. MOLE NO. (A• .,_._.- ...... tlfl• 
-m·-• 
! CB-VIM-2 
11. ~~~~~NNfA::Lili!TA,\IIti!N l o.•{311t••o 
~ UHDI•Tullll•l:o 
L NAME OP' DltiLLI:" 
14 TOTAL IIUIIBEIO COIOE .OXEI) for olastiC iars 
FLOR RIVERA 
II. llLitVATIOM GROUND WATitiO 
nOt enCOUntered 
a. DIWt:CTIOH OP' MOLE 
IJ¥•111TICA1.. QtNCL.IN.D ----- o••· P'tiiiO.. Y&IIIIT. 
••. DATE HOLE 
I 
Yo".:'2~~83 
: 1B':"2'n"-·lf~ 
7. THICKNESS 0' OVERBURDEN greater t~an 20 ft • 
17. ELIEVATION TOP OF HOLlE 
17::_3.:._• 9:_:8:::_cfc_:t:..:•.;,.· ::;-;;;--------i 
. DE .. TH ""ILL ltD INTO ROCK nO roCk dr1ll l ng 
e. TOTAL DE,.,.M OF MOLlE 
t:U n;. 
~ ~~.:. 
8 
1 r-L 
...__::: . 
IllY 
~ 
17 
~-- ,~ ROCK FRAGMENTS, subangular 
1
.~ 
= ~
/,, to 
l"--4'-'4c.:;;%,.__-+-'""t£~--+---
subrounded, fine sand, z 
18 , 
I 
~ 
/ 
little silt, trace clay, 
2 ~ 
87 
6 _3 
= , / compact, friable, varying 
1 
62 
, 
:r-::/-.!-' from dark brown (samples 1.2~;,:--+---+~-1-2-
1
--+-1--, 
=("/to light yellowish brown 
3 ~ 
28 j 4 •2 
4-::~ _ and olive brown. 
, 
11 
= ~ 
(GC) * 
1'-8-
.. >-,-,/ --t---+-10-:----+! --
5-::•/ 
4-' 
- ~ 
/ 
~ 
37 i14 
~ /? 
1"-/_4_7%+--~17 __ 
--t-1 --
- =·/· 
::!. 
~ 
-/ 
5 
r-:: ~ 
___.2._ 27 
-
% 
18 
; 
=_! 
~ 
~----+----~------4----
v.. 
z 
20 
j 
a-:v/ 
6 2o 64; 5.1 
~~ 
1"--~%*-_~34~-~~-~: 
=,.,/ 
l 
flU 
i 
,,._::t-
/ 
7 ~ 
3117.3 
1v -v-.,-
% 
' 13 : 
' 
1~r'-; 
F--%--+--8-+-'-11--+-, -,f-, _____, 
=V' *Unified Soils Classifica-
~
62 1
6
t' 
,.,_::I 
/ 
tion symbol and legend 
% 
i 
173.98 
10 
6.6 
= 
results. 
r----: 
I 
i 
-~~ 
g~33! 
1 .. -l/:;~ reflect lab test data 
1'-%--'-'--~--+-1-5 __ _,11----i 
1~~ ' 
,-- '' 
I 9.4 I 
lG0.48 3.5 
• 
% 
16 
i 
I 
1~/ox• SAND, weathered rock frag- z rli--1 
1 
= • 
ments, some clay, littl~ 
10 I"' : 
-".~silt, compact, friable, 
~36 i 13.3 
1s-:: ,/o" yellowish brown. (SC) 
i,:S" 
%,;, 
20 
=_"'%"' 
kJ 
i 
I 
_.A'o
0
_ 
11 
17 
1 
~12 
J 
1~ 
0 h 
i---
138 
,. 
' 
-~ 
21 
i 
1~~ 
/,:,3" 
% 
12 ~ 'I 
!I 
:/o () 
~~8 13.7 
1&-::_-~ 
24 
i 
! 
o 
/ 
AUGEIRED ~" 
: ,/•. 
1./" 
_13 
! 
19""':: 
p 
_;....-
=/'. 
13 
"" 
1 
153.92 
-
0 
/ 
~53 '12 
2o - v- · 
' 94"' 
?R 
EMMCA!~~M 18 J6 
PRIEVIOUS EDITIONS AIOIE OIISOLETE. 
(TRANSLUCIUiT.) 
PLATE B-6 
PIIIOJECT 
ESTATE MON BIJOU 
ST. CROIX, U. S. V. I. 
I 
HOI..E NO. 
CB-VIM-2 
HeleNe CB-VIM 
~ 
IMUT 1 
DRILLING LOG 
l"'voaSoUTH ATLANTIC 
IIOIITALLATIOjACKSONV ILLE 
OF 2 SHEETS 
I. -OJEC:T 
.-<;TAT. r.ifiN R 1.1011 
ST 
ronTY 
<; V T 
L DIIIILLINO AO.NCY 
GFO CIM. 
INC 
.. NOLl: MO. (Aa .,__- ........ Hll• 
oo. son MD Tv .. c>P ••T 4x5! core oarre 
IZ. -IOUP'Ac:1 Ultll,..l DIISIOIOATIOOI OP' DltiLL 
CME 458 
' 
••. ~3~~kNN:A:tLil~AKIUI ~DiaT'i2aao 
! 
UNOtiTu.-aao 
-•·-
! CB-VIM-3 
L MAliC. OP' DIULL&IIt 
1=1011 IITVI=IIA 
IL TOTAL IIUIIURCOIIE liOXEI 1-fOr plaStiC .iarS&C 
... ELEVATION OROUIID WATER 
NONE 
•• OIRRCTION 011' MOLl: 
11TA .. TIEO 
(C~L.TIED 
'XlYIUITICAL QINCLINIED ---- D& •• P'ROM YIEJIT. ... DATE MOLE 
I 10-21-83 
ID-28 -83 
17. ELEVATION TO .. OP' MOLE 
172, 72 ft. 
7. TMICKIIIISI OF OYIIR8URDt:N8ed roCk not reached, 
II .. TOTAL COlliE Rt:C:DYI!RY FOil 80RIIIG 
/) 62 
1-· DIIOOTM OltiLLt:D INTO ROCK 
• U-
••· SIGNATURE o.- INI"Er . yy /7.L. _L .v'. 
Guillermo Abudo "'~./~41"~ 
' 
je. TOTAL DIEOOTM OF MOLE 1 
ft 
a:LCVATION 
ft •• 
172.72 
71.22 
62.22 
-~ 
51lty clay,trace nne sana, V,:, _
6 
g> 
=v; hard, little white silty 
1 
,!2 
1_: 
concretions, dark brown. (CL) 
.JL_ 23 
20 
-
/ 
. -
% 
15 
;:: 
.5 /;:? 
[{. 
2-: • 
Silty fine sand, little 
lQ.._ 
10 
N )( 
0 
0 
N 
-%: clay, mixed weathered 
2 ~ 
33 
=v ;/ rock fragments, 1 i ght 
72 " 
18 
~V/ 
yellowish brown.(SC)* 
1'~......;~+---+.;.
12
;;.._-+---+---;:,: 
=~ 
3 ~ 
41 
9 
§:--
4-=v-/ 
~ .· 
: g~ 
~i~ 
~4::", ....... ;'r---+'1""0--+----: ---;!' i~ 
5 = ,/' 
/ 
4 tlL-
26 
11 I~~ 
= / 
lea·~ 
' 
: -;;; ~ 
o-:_r:-: 
[Zo 
5" 
~; 
; :o 
:~ 
5 rlL-
38 
11 ~~~ 
-r-: /-:./ 
l :;;::: ..c:: 
• 
,._:=_t{ 
12'/'/ 
~~ 
~~:11 
0 
-
' 
1----20 1.. 
38 
7 I 
I 
: 
~- C// 
/ 
0 
I =;-
• '', 
-
. 
/ ~ 
I 
6]~; 
~ 
i z ~ §! 
,Jt::2 
'/ , :; " ,I 
1 i! 
~~:~ 
: 
/ 
Q-
L/ 78"' 
I <n 
~;::!; 
o.5 v 
17
5.. 
I 
u--= 
/F>ilty clay, trace fine sand, 
. 
~ 
' 
:v/ 
~ard1 yellowish brown,dark 
8 ~ 
95 
17 l 
i 
-
./ I:JrOWn SpOtS, ;rac,e rOCk 
64' 
i on 
I 
1 .. =V" 
:;,:: 
rW-
=r Y 
ine sand, weathered rock 
9 
13-:1-{' /!fragments, hard clayey 
~ 
1----
-/ 
y 
ilt lumps, yellowish 
"' 
-
· 
lfr;onmPnt~ 
\ CLJ 
·' 
" ' 
L..l.:L 
14-::r / 
SC)* 
1o ~ 
=r:/.fkunified Soils C~assification 
~ 
102/ Boulder 
6" I 13 · 
1 
' 
I 
102 
' 
10 I 
! 
=v . ..,Prown mixed white. z 
22 
~-=V . ..,. symbol and legend reflect 
7_%_ 
15 =V lab test data results. 
"'2'~L.Iil...+---+_-2"'7:--+---+-l---l 
=k 
11 
39 
84 
9 
w:r. ~ 
% 
45 
i 
'--=~ 
""r;,;:-=-:..:::.,+---t-2.:.;8::.......t---t--i~~~~t 
1t :~ 
12 34 76 
12 
Drilli 
54.72\ .18 :/. 
% 
--:rr-
~3-27 
154.68-r~~~r.==:======"f::nmQ:&~~~~:t:=c.:...; 
:~.PSub angular to subrounded 
12/' 
1) Used 
1g_:~# rock frag'!l'!nts i~ a silty 
4x5t Core Barrel 
-
• 
clay matr1x vary1ng to 
13 
2) Drilling time 
:r; ./" layey silty sand,(GC) 
3pm-6pm. 
152.72 
20 -V• 
PROJCCT 
I 
MOLE NO". 
Mon-Bi jou ,St. CrolX,U. S. V.I. 
CB.VI~,-3 
EMM~!~~M 18 36 PRI!:YIOUS IEDITIOOII AlliE O .... LETI£. 
(TltAifSLUCSifT) 
PLATE B-7 
DRILLING LOG (Cont Sheetll'"v•rooN ro• Of""" 
172.72 
Hole No. CB-VIM-3 
I'IIOJfCT 
!INSTAlLATION 
I''"" t. 
Estate Mon Bi ·ou St. Croix U.S.V.I. 
Jacksonville 
Of 2 
SHUTS 
ClA$SifiCATION Of MATtRIAlS 
%COlE lOX 01 
lfM.UKS 
ELEVATION 
DEPTH 
LEGEND 
(~-) 
IECOV· 
SAMPLE 
( o,..ll,., ,.... ...,r ,,.,. Jrpcb llj 
flY 
NO. 
.,.u"""l· •lc .. •f "6"'/tct~•tJ 
. 
b 
c 
d 
. 
f 
8 
152.72 
20 -~ 
Core run from 18-21 ft. 
/33% 
= 
(GC) 
13 
21 -
. 
= ~ 
No recovery 
/:: 
10-28-83 
-
14 
9:20 am to 1 pm. 
22 -= ~ 
Rock fragments in silty clay % 
15 t&16.,Split- spoon sample 
- .,;/. matrix, coarse sand (GC) 
14g.]2 
23 ---
This borehole stopped 
-
at 23 ft. d pth. 
_:::. 
Boring 38 drilled next to bor ng CB VIM-3 
-
was completed to required 30 t. de th. 
-= 
-
= = 
-= = 
-= = 
I = 
- -
' 
-
I 
--
-= 
I 
-
=1 
---! 
~ 
-< 
--1 j 
j 
-< 
' 
--1 
i 
--J 
! 
-i -
I 
-
I 
-
I 
-
i 
-
: 
I 
=1 
i 
; 
' 
' 
--1 
---! 
-; 
--1 
! 
::J 
---i 
i 
--1 
I 
-
I 
-< 
! 
--
-' 
I 
I 
I 
-; 
I 
I 
-= = 
= 
-= 
-= 
--= 
-= 
---
-= = 
= 
I 
-= 
I 
: 
-= = 
-
lNG»< ~ 
1136-A 
011'0 
IMt Of'-Ut·l•l 
I'IIOJICT 
!_""" NO 
Estate Mon Bijou, 
st. Cro1x, u.s.v.r. 
CB-VIM-3 
PLATE 
B-8 
• • fR-VTM-3.R 
........ 
DRILLING LOG 
'DIVISION 
SOUTH ATI ANTTf 
IMou•LLAnOII JACKSONVILLE 
I'"UT 
1 
OP' 1 SHII~TI 
I . ..,OJECT 
IO.IIUAMDTY"EowoiT4X5i Core Barrel{see rema 
ESTATE MON BIJOU. ST. CROIX 
U.S.V.I 
, UAT- ·- •••• ·---.. ·~--
L"'"A !~ (~-.. -~--
MSL 
X= 1 072,798 
Y= 73 794 
2. MAMUPACc'M'Eit'4ssU10MA1 1- "" -ILL 
1- DRILLING ACII:NCV 
r.l"n fTM 
TNf 
tl. TOTAL MO. o~ oveR-
1 DIITUR•ao 
i UNDtiTU ... &D 
&. ~LC NO. (Ae ...... _. ...... Htl• 
•uRDEM IAIIPLIII TAKEN , 
1 
-•·-"" 
i CB-Vll-1-38 
toL TOTAL MUHD CORE _,XI:I 
1 
L NAME OP' GRILLO 
FLOR RIVERA 
IL ltLttYATIOII OltDUMD WATER nOt enCOUntered, 
a. DIIIII:CTIOM OP' MOLl: 
~ITAAT&D 
tc~L.&Tao 
0YfRTICA.._ QINCLIN&D 
te. DATit MDLI: 
lll-03-83 
: 11-08-83 
D& •• r'WOM Y& .. T. 
7. TMICICMI!SI DP DVt:ltOUitDt:N breater tnan . JU_ tt, 
17. I:LI:VATION T~ OP' HOLE 
172.72 ft. 
18. TOTAL COitl: RI:COVI:RY POIII _,RING 
/') 
.. 
. ot:I'TM DRILLED INTD otococ Bedrock not reached 
... IIGNATUIIIE OP' IMiftE~~ 
.. 
L.~~ :_) 
I. TOTAL Dt:I'TM DP MOLE 
30 ft. 
GUILLERMO ABUDO 
/..._./<. 
CLAIIIP'ICATION OP' IIATIDUALI 
-.cORa ODX-
fDrlll,.. ,::..~ 
... ...,,. ol 
I:LI:YATION OIIPTH LI:GENO 
~-
It I: COY· -
DIY 
MD. 
....-...... ··~· " •• ,.,Unc) 
ft .• 
~ 
c 
4 
. 
I 
172.72 
0 : 
Augered to 18 feet; then 
: 
set casing to 18 feet and 
~ 
rotated it to advance to 
19 feet. 
~ 
f-
= 
-
154.72 
lll -
: 
KocK tragments, SlltY Clay ~ 
sample from cas1ng 
-
matrix. 
shoe. (ZW). 
153.72 
10 -
: ~ 
~ 
- ·.// 
1 
2~ 
Subangular to subrounded 
1 
Water pressure 
= 
~/~/ rock fragments, in a 
~4" 
I 
in drilling (psi) 28 
.-~/,r greenish brown silty clay 
' 
21--= 
matrix; matrix makes up 
I 
1 
= 
~ .. /,. 
approximately 10% to 30% 
/ 
-
/ .. · by volume; clay has high 
/100 
22--= . . dry strength, plastic, 
= 
sticky when wet, trace % 
Water press. 10-15 psi 
- ... 
/ 
silt; rock fragments up to 
1 
2~ 1./· 8 em diameter include 
. 
-
andesite, tuff, siliceous 
1" 
- • 
tuff, chert, quartz-horn-
I 
Water press. 10-35 psi 
-
24--= 
_/ • blende, phanerite, basalt, 
I 
1 
-vc 
moderately strong to very 
/4~~ 
-
strong rock fragments. 
- ..• 
N-Blows 
25-= ,·//:_. Soil matrix varies to 
= 
~:-~· 
sandy gravelly silt. 
~: w 
140# harrrner, 30" 
-
(GC) 
1 
drop on 2 ft. long 
26-= 
1-3/8"IOx2"00 spli 
= • 
811 
/ 
spoon sampler. 
. . 
/ 
= . 
1 
Water press. 8 psi 
./ 67 
27-:: , .. 
I 
%' 
= // • 
1 
Water pres~ 15-30 psi 
28--= 
8 
= /' 
~ 
-» 
29--= 
1 
Water press. 15 psi 
= ~~ 
-
142.72 
30 -= 
: 
-:: -= 
-= : 
--= : 
I 
= 
-= = 
-
ENG FORM 18 36 
PREVIOUS I!DITIONS A .. l: 08SOLI:TE. 
PRoJEcT Estate Mon Bijou 
I HOLE NO. 
MAR 7! 
St. Cro1x, 
U. S. V. I. 
CB-VIM-3B 
PLATE B-9 
s nt~ 
,~ tit'' 't 
---
Helo "-·CB-VIM-4 
lliiiVISIOit 
INS ALLATION 
SMI:I:T 
1 
D .. LLING LOG 
SOUTH ATLANTIC 
JACKSONVILLE 
OP' ? 
SHI:t:TS 
I. NOJCCT 
10. s1u ""o TVN o~ on 1-3/S"!Dx2"0D Sol it sooon 
ESTATE MON BIJOU, ST. CROIX, V.I. 
I. DATI ... ~-
OR ..... R 
·------
xoc;"T1':'MT.!~ .. r~.697 
MSL 
II.. IIAMUP'ACTUIIEWI o•IIONA llliJIIIIIII Of' OIIIIILL 
S.IHIU .. I.IMe AeiENCY 
CME 458 ( ho 11 ow stern auoer drill i no l 
G!=O CIM 
INC. 
''- :S~~ .. ·fA:.r ... ~~·.rA ...... 1 Dl'20"••o 
! 
UNOIITU•eCO 
C. NOLa NO. (A• .,_ ... -
....... tHie 
-•·-
i CB-VI~l-14 
14. TOTAL MUIIOI!IO COIOI! IIOXI!I} fnr nlastiC iarS 
a. NAME OP' DRILLDII 
_fLOR RIVERA 
IL I!LI!VATI- OIOOUIID WATCIO not enCOUntered. 
a. Dtlti:CTION OP' MOLE 
1&. DATI: MOLE 
teTA"T.O 
IC~LcTao 
r;:J•••TICAL OINCLIN.D 
o••· ""OM v••T. 
i10-19-83 
i10-19-83 
approximately 29 ft. 
17. ELEVATION TOP' OP' HOLE 167.61 ft. 
7. THICKNESS OP' OYEIIt8UIIt0EN 
18. TOTAL CORlE lltiiCOVEIJitY P'OR .oi'IING 
67.3 /7 
.. 
~· DEPTH DRILLED INTO ROCK no rock dri 11 i ll!l 
... SIGIIATUIOI! 0~ 1111~1!~ 
a~ 
at:~ 
f-. TOTAL DEPTH OF MOLE 
29 ft. 
UILLERMO ABUDO 
• 
CLAIIIP'ICATION 011' IIIATDIALS 
'-CORE aox o.. 
(DriiUnt~ ,..:.•=::.K~ . .,,. ol 
CLI:VATION DEPTH LEGEND 
(D .. --
ltECOV• SAIIIIPtLE 
I!IOY 
NO. 
~lo~-11, .. ,.. ... ....,,._,., 
. 
~ 
. 
4 
. 
I 
67.61 
0 : . 
0 
Fine sand, little silt, rock z 
__£.__ 
. 
-
fragments, roots, dark 
1 
..1L 
1-= 
0 
0 
brown. (SM) 
43 
18.4 
66.1 
: . 
-.·-
... 
25 
.5 
~ 
z 
2-= 
14 
-
= 
2 
.1L 66 
7.1 
-y. Rock fragments, fine sand, 
• 
-
42 
3--:: 
little silt, compact, but 
% 
:. ~ 
friable, brown. 
1~/ 
~ 
-
(GC) 
3 
....!.§__ 31 
8.1 
4--= 
= v 
In% 
13 
-
11
11 /" 
.l.L 
5--= v~ 
/ 
= 
4 
~ 
34 
5.31 
- /. 
51 ~s 
21 
6--:: 
14" .· 
E_ 
i 
= ,'. 
I 
4.2, 
- • 
5 
-~ 96 
7--= 
/ 
= • 
787; 
53 
- --· 
16" 
2_9_ 
I 
8--:: • 
6 
:3_3__j 
-
69 
8 
58.61 
9 =· • 
ag;' 
36 
i 
_/ 
-
-
Clay, some silt, some fine 
14" 
24 
i 
-
/ 
'36 
--
sand,hard, olive brown, 
7 
63 
13 
i 
10 -
// 
i 
)--= 
dark brown spots, pockets 
78;s 
~ 
i 
= v// of white, weathered rock 
-
fragments. 
11" 
20 
! 
11--:: 
.• / 
(CL) 
/ 
r-291 
/ 
8 
65 
15 
= 
/ 
I 
12-= 
61's 
36 
i 
I 
' 
-t---: 
= 
14" 
lL 
j 
-
~ 
I 
13-= 
/ 
9 rR. 46 
16.3 
54.11 
= 
/ _lBW 
24_ 
fL3.5-
~ 
V,:. 
24 
14-= 
Rock fragments, subangular, 
10 rye 
. 
-
mixed clay,some silt, trace 
: 
~ 
r--
38 
19 
15-= 
fine sand, very stiff, 
20 
olive brown and olive. 
% 
-
~ 
~ 
: 
(GC) * 
-
~ 
11 
,..£§._ 
16-::. 
*Unified Soils Classifica-
53 
20 
= 
tion symbol and legend 
)% 
28 
17-= 
reflect lab test data 
~ 
r-N-
v 
results. 
: 
12 ~ 
28 
12.2 
-
~ 
18-= 
1005 
15 
= 
::,~ 
15 
-
13 
23 50 
19.2 
19-= /. 
-
= z 
% 
27 
48.61 
20 = 
14 
ENG f~~M 1836 
P"O.IECT 
ESTATE f-10N BIJOU 
l HOLE. NO. 
PlltEVIOUS EDITIONS AlltE Oe&OLI:TE. 
MAR 
(TRAifSLUCIUI'T.) 
ST. CROIX,U.S.V.I. 
CB-VIM-4 
PLATE B-10 
r-
DRIWNG LOG (Cont Sheet)i ..... """' '"' "' """ 
167.61 Ft. 
Hole No.CB-VIM-4 
I'OOJfCT 
! 
INSTAUATK>N 
I SHUT 
fSTA1 
r.«''N BlJOll 
ST 
CROIX v. I. 
I Of 2 SHftr\ 2 
1 
• 
CLAS51f1CATION Of MA TfRIALS 
'lC. COR£ lOX 01 
IEMARKS 
I 
IUYATION 
Dfi'TH 
LIGIND 
(thJC'rifii-J 
R£COV-
$AMPLE 
(Dnu,., ,,,.~. w,,, '·"'· ,;,p111 ,, 
ElY 
NO. 
.... ,.,,.,.,, '''·· fi ,,~,,fi, ... !, 
• 
b 
c 
d 
n.•% 
f 
Rlnw~/4 11 N v• lu<> 
-~ 
I% 
~ 
w 
-
Same - From 13.5 ft. 
34 
12 
: 
21-= v. 
to 22.5 ft. 
1% 
14 
16 
-
tt 
1L 
-v. 
22....: 
15 ~ 
52 
15.8 
145.11 
: y. 
;R'l': 
":II; 
23 _: [:; 
L 
16 
: 
Silty clay,- some fine sand, 
16 
17 
37 
16.3 
24-= 
?n 
[:; 
weathered rock fragments, 
94% 
: 
light olive brown, 
t! 
26 
-
25 _: 
(CL) __ 
17 
32 
62 
-
::; [:; 
-
· .. 
--
30 
-
0% 
26 _: 
ti. 
22 
: v 
18 
29 
70 
22 
: 
41 
140.61 
27 -/ 
44% 
=V.I 
Rock fragments, some 
fZ 
26 
silty clay, little fine 
28-=~· sand, medium olive brown, 
19 
48 
120 
7.5 
~ 
- . 
-..,, 
' 
=/ 
(GC) 
a 
i 
138.61 
~~ ?n 
1nR/1';" inRI"" 
29 -
j 
: 
i 
I 
I 
i 
---1 J 
I 
I 
i 
I 
I 
~ 
I 
I 
I 
: 
I 
I 
' 
I 
! 
i 
' 
i 
I 
::j 
' 
~ 
~ 
j 
: 
I 
I 
' 
1 
I 
i 
I 
-i 
-< 
-j 
' 
-' 
i 
-' 
i 
-= 
I 
-
I 
-: 
-= : 
_: 
: 
: 
I 
-= : 
I 
-= ---
-= 
I 
-
I 
-: 
- ----
EN~~ 1836-A 
G..O. INI 0"-UI·U:I 
oooJKT ESTATE MONBIJOU 
I""" '"" 
I ,.V 
' 
ST. CROIX, U. S. V. I. 
CB J ... ~ 
PLATE B-11 
Helo He CB-VIM-5 
HILLING LOG 
.~VIMON SOUTH ATLANTIC 
~-··-~· ,_ JACKSONVILLE 
•-••T 1 
CW 1 SMUTI 
. .....,.,.,.T 
•. liZ& MD TY ... OP .IT see remarks 
ESTATE ~lN BIJOU, ST. CROIX, V.I. 
.DAT_P"_ 
,_R ·----
x~-;"T;;,'",-;:-~ -;j-:af.6 
MSI 
ra. -MUPM;" U,._ .. fl"l DIUrOMA' 1011 DP" DRILL 
DfiiiiLL .. O AO&IICY 
OlE 45-B 
GEO CIM 
INC. 
11. TOTAL 110. OP OVEflll• 
1 EMeTu..•ao 
1 UNOtaTu•••o 
._ MOL!_ NO. (A• _,._ ......... rttl•! 
HRDII:II IAIIPLI:S TAKII:N • 
12 
-•·-
! CR-VIM-5 
a. IIAMI:OP DRILLER 
, .. TOTAL •u••• cOIIE 110n•1 for olastic jar sto i 
FLOR RIVERA 
IL &LI!VATION GROUND WATII:R 
NOT ENCOUNTERED. 
L DI .. II:CTIOM OP NOLIE 
!•TARTI:O 
IC~L&TCD 
tr;Jw&IIIITICAL QINCLIN&D 
ta. DATI: MOLE 
i 10-19-83 
: 10-20-83 
D&e. P'lltOM V&RT. 
. 
17. ELEVATION TO .. OP MOLE 160. 3Q ft . 
7. TMIC:KNI:SS OF OVI:IIt.URDCN GREATER THAN 20 ft. 
1. HPTH DRILLED INTO ROCK 
-0-
II. TOTAL COlli II: RI:COVII:PtY FOIII aoftiNG 65 _, 
.. 
11. SIGNATUfllll: OF IMIPII:~~ £..£.. 
I. TOTAL OE"H OP' MOLE 
20 ft. 
GUILLERMO ABUDO 
II:LII:VATION OI:PTH LII:G END 
CLASSIFICATION OP' MATERIALS 
'4COIIIII: •ox 0111 
(Drfll., ,,_~a:.,JIIitf:. ... ._,. ot 
~-
III!COV· IAIIPLIIE 
I!IIY 
NO. 
Bl o~lf"",' ".,....,. .. ..., 
. 
~ 
c 
4 
. 
I 
!DU,.)IJ 
= I ! 
Fine sandy silt, trace clay, ;,:. 
J1.._ 
00"> 
·~ r::: 
= 
rock fragments, trace 
+-'0'-
roots, dark brown. (ML) 
1 
..!L 
.. ~ cu 
34 30.( ... 
·~ 
1--::. 
........ Q. "" 
8% 
20 
cu '+- E 
= 
O:::N"' 
[Z 
cu 
"' 
r::: 
-
...!£._ 
a.r::: 
or:: 
2--:::. 
"0 
• 0 
.... 
2 
..lL 
t..a.o 
r::: 
= 
26 13.4 .,oa. cu 
"OI..V! .... 
-
14 
r:::-o 
r::: 
157.30 
3 -
% 
ta= 
+.1 
0 
I :f. 
+.JO ·r-
u 
~ 
Silty clay, little fine 
..§.__ 
"'""~ 
= 
•Q. ... 
sand, rock fragments, 
Et..V> 
cu 
-
rlL 
ocu 
+-' 
4--:::. ~hard, dark brown,white silty 
3 
29 
20 
.tE8 "' 
3: 
concret1ons. 
14 
10= 
= 
CU .r::: N 
';;; 
(CL) 
rz 
:::>""X 
-
~ 
10 
~oc ... 
..,,.._ 
:::> 
5--::. 
15 
> ........ = 
+-' 
4 
I 
•• CO "' 
= 
34 11.3 :z +-' ...... z: 
-
VIM 
-
19 
I 
CU 
I 
I 
% 
:z +-'-
:;: 
154.30 
6 -v 
[% 
.E._ 
= 
Clay, some silt, trace fine 
-~ 
''''· "'''· , .. ···'"'''' 
5 
...!.§.._ 44 
19 
7--:::. 
rock fragments, olive 
= 
brown to yellowish brown, 
% 
28 
- ~ 
black and white silty 
[:{, 
2._ 
a-::. 
concretions. 
-
(CH) * 
6 
.lL 36 
17 
--
~ 
% 
25 
g-
~ 
-
..lL 
---
7 
.1L 43 
19 
10--::. 
= 
% 
27 
-
~ 
V,; 
..lL 
11--::. -
8 
..lL 41 
-
12 -
% 
27 
'-= 
~ 
..lL 
= /; 
13--= 
9 
.1L 44 
15 
-
18 
146.E::.J 13 r-
1 
14....: 
Silt, trace fine sand, 
[:(, 
12 
: 
compact,friable,trace clay, 
10 
"16 
-
white and pale yellow. 
~ 
40 2,'i.3 
14;j.3() 
15 -
(ML) 
% 
24 
: 
1 Clayey s1 lt, trace flne 
v.:: 
...!!.. 
-
sand, hard,olive yellow to 
16-= 
light yellowish brown. 
11 
.lQ_ 48 18.4 
: 
Otl) * 
28 
= 
*Unified Soils Classificatio 
~ 
15 
17-: 
symbol and legend reflectla 
12 l2r 
: 
test data results. 
1--
47 
21.1 
18 -
---· 
% 
26 
-
AUGER 
-
v.:, 
~ 
19-= 
Fine sand,little silt ,brown, 
= 
at 20 ft. 
13 
.12_ 33 
32 
140.30 20 : 
% 
18 
ENMGA!~~M 18 36 
~IIIIOJI:CT 
I HOLE NO. 
Pfti:VIOUS I:OITIONI ARE OeiOLETI!. 
. . 
(TIIANI£UCU., 
Estate Mon BlJOU,St.Crolx . 
U.S. V.I. 
CB-VIM-5 
PLATE B-12 
Hele Me. CB-VIM-6 
SOUTH ATLANTIC 
......... TION JACKSONVILLE 
SHUT 1 
RLRVATION 
DI!PTH 
ft. • 
ft.~ 
166.67 
CB-VIM-6 
than 20 ft. 
CLASIIP'ICATION 0" MATERIALS 
(D--
4 
Silty clay, trace fine sand, 
hard, yellowish brown, 
1 
some white silty concretions 
(tl) . 
. s~~~r-------------------~~~~--;-~;-~ 
146.67 
2 
3 
4 
.5 
5 
6 
7 
.5 
8 
9 
10 
14 
15 
16 
17 
18 
20 
EM,.G4!~~M 18 3 6 
Silty fine sand, some clay, 
hard, mixed weathered 
rock fragments, light 
yellowish brown. 
(SC) * 
Silt, little fine sand, 
trace clay, hard, pale 
yellow, white silt pockets. 
(ML) 
Fine sand, little silt, 
some clay, p~le brown. 
(SCJ 
clay, little fine 
hard, light yellowish 
to pale yellow. 
(CH) * 
*Unified Soils Classificatio 
symbol and legend reflect 
lab test data results 
P"£VIOUS EDITIONS Afl:l!. 0-.GLE:TE. 
(TRANSLUC£11'1'.) 
PLATE B-13 
Mon 
25 
l30.8 
J 
31.6. 
125 
20.3! 
30.7 
28.1 
Bijou,St.Croix 
HOLE NO. 
CB-VHi-' 
CB-VIM -7 
l
l"'vo .. -
IIOouoLLdiOHO 
~SMUT 
j 
DRILLING LOG 
SOUTH ATLANTIC 
JACKSONVJ I.LE 
o• z SHUTS 
•· ..,._OJ'!CT 
oo. '""AND TY"" o• ••• 1-3 G" !Dx2"0D 2ft. SQl its_£ 
ESTATE MON BIJOU, ST. CROIX, V.I. 
I"·"A'- . ..,.,._ .. ,..A,..,,."".,." ......... , 
k-.~~Mn~~==~"-==r--~~--------_, 
MSL 
---
·x L7'"t.,.._.._r~"u: ~"!'-!--
.lli:'LA!>II 
T• 
/.i. '!f.:IL 
I. -IOUPM;;TU"E""I DIUIGIOA'IOII OP ""ILL 
.. D"ILLIIOG AG.IOCY 
CME 458 
GEO CJM, INC. 
II. TOTAL IOO. OP OVE"· 
(DOOTu,.auo 
.. ::.L:.!'!.!:;.,---- """! CB-VIM-7 
.... 00:10 "''"'LEI TAKEN! 
20 
1 UNOI:TU ... I:O 
S. NAME OP DRIL.LIR 
; 
t&. TOTAL NUMaU COftl: ltOX~I 
- Q-
FLOR RIVERA 
tL CLI:VATION GROUND WATI:R 00ne 
•• DU,I:CTtON OP' MOL.R 
t•TAIIIITIEO 
1 co.-LIIT•o 
atJv&IIITtCAL QlttCLIN&D ----- D& •• PIIIOM V.IIT. ... DATI: MOLl: 
_l 1Q-2Q-8J 
: _ _1Q-2Q-8J 
7. THICKNESS OP OVEII.UIIDEN bKtA I tK I MAI'I .lU Tl, • 
17, IILEVATIOII YO .. OP HOLE 
t o; 7 
Sl.t ft_ 
~- DI:PTH DRILLED INTO ROCfC none 
1-· TOTAL DIIO'TM OP MOLE 
.lU n;. 
ta. TOTAL CORI: RI:COVE"Y 'Ofll BORING 
8~ 
... IIGNATUIIE OP INII'ECT.JI"l..# ./7/ 
/ ~ 
GUILLERMO ABUDO ~-~~~~~ 
1157.81 
=_ 
Silt, some clay, trace fine 
u·- j 
sand, very stiff, weathered 
,~ 
_L_ 
.!.L_ 28 
15 
154.81 
150.31 
l4&.o1 
1-= 
rock .fragments, dark brown. 
/ 
1 
= 
(ML) 
V' 67% 
-
26.1 
2
-= 
IZ 
= 
-
2 
1§__ 27 
12.5 
.,_ -
6,% 
12 
t: 
= 
Silt, little clay, little 
1 .. / 
g 
: 
, 2 
,__ 
= 
fine sand, compact, friable 
~ j' 
j <= cnw 
4--:: 
white and pale yellow 
v~· 
3 
111l52 
27 
32.3 
-~go_ 
-
6'"~ 
~~-~ 
-
(MH) * 
1'----"-'"-'",l."t---t....._ _ _.__--1~---: !; ..; "' 
~-
6" 
8 
! 
! 
~ 4- g 
... -
~-----
I 
Q) (".J c 
= 
4 
11 
24 
23. 4. Cl."' :;:;-
-
-----
I 
-o o 
I 
f, g ~/ 
____JJ,.1_ 
' 
'--
---' 
:=-~~-:l. ~,-f-IlL-· h=1t-1'1nn'Pe-s~a;;;niii1a:r,-Tr 
tlr:;iarce'P. -:s<'liJnt'-:,~--i-:-•.::8
:.::9:..:~;+--
5 
~--
.~!. J ~:,I ~-= !,_-~=~ 
~-
,:compact,butfnable, 
I 
~.-: 
: 
.: 
-
1
- vlhite to li-,ht gray. 
I 6 
13 
: 24 
.16.6 ro-::~ 
Q---+~·--~··T4--------~·~s~rnL_ __ -i __ 2s_~" 
~1---, 
J~~ 
'-/ 
. 
~ 
: 
Clayey silt, trace fine 
5.5"/ 1 
_g __ 
1,,__=/:sand, compact, friable, 
,// 
7 
19. 
47 
36.3 
'u -
very pale brown, to 
• 
=v:brownish yellow (samples 
V 86%.. 
?A 
l 
-
10,11,12,13,14,15) to light 
5.5"~ 
lZ _j 
' 
11-::~yellowish brown (samples 16, 
1 
: 
17, lS, 19,20) 
/ 
8 
16 
36 
29.7 
1 ,___-/: 
( CH )* 
jo:-'·_'-"' 
81G,;...· 
• ..,._/_--+'?..,.>in'--7--~-
'~ -
~8"1 /00.. 
J.O___i 
i 
1~v: 
l;;oo, 
9 7! 1" i "·' 
14-:" / 
~3.~ 
10 
! I 
'I 
=~ 
~.~,,. 
10 r, i ,, i 
:;1~ 
17':1 11 
::- j 30 I 36 .I 
"=~ *IAlified Soils Classific-
94% 
17 
I 
i 
J 
--
ation symbol and legend 
8 ,, 
,l!i___ 
!_ 
1 
17-=-V: 
li.__ 41 
-
·· 
reflect lab test data 
results 
12 
32 ·9 1 
18 -~ / 
/100% 
22 
1~}'/ 
].~/ 13 ~~ 
30 
:// 
/97% 
17 
20 : 
/ 
14 
12 
I 
44.3 
c: 
c 
u 
'-
"' 
+-' 
"' 
3: 
EMMC:..!~~M 18 J6 
"OOEVIOUS EDITIOIIS AilE OMOLETO:-
(T7fANSLUCIUf'T) 
P"OJECT ESTATE MON BIJOU 
ST. CROIX, U. S. V. I. 
I NOLIE NO. 
tB-VIM-7 
PLATE B-14 
i 
r 
I 
I 
! 
DRILLING LOG (Cont Sheetl!"rv.rooN '
0
' Of""" 
157 .Bl 
Hole No. CB-VIM-7 
..OJI!CT 
!"'"'<: 
FSTATE MON BIJ )U 
ST 
CROIX V. I 
I'"'STALLAJION JACKSON¥ ILLE 
i Of 2 5Hffl!o 
BEVATION 
127.81 
Dfi'I"H 
LfGI!ND 
ClAS$1fiCATION Of MATUIALS 
b 
d 
'lC. COllE aox o• 
IECOV-
$AMPLE 
ElY 
NO. 
• 
r 
8" 
IEMAIKS 
(0riiiMI IIJflt, a-.k., l.,u, •tplb ~Jf 
,.., .. r-;_,, tic., •f U,~t•fic•"' J 
LOWS 
N 
K w 
15 
=v 
-=~ 
21 =v: 
·clayey silt, trace fine 
sand, compact, friable, 
light yellowish brown. 
14 19 34 
::1~ 
24~t% 
(CH) * 
25 -::r / 
=t% *Unifi~ Soils Classifica-
-
tion Symbol and Legend 
26 -=v. Reflect Lab Test Data 
= 
Results 
--
27--= / 
an / 
/ 
V:Ooz 
16 
14 
~ 
48 
r----
25 
~ 
_g_ 27 
15 
JQ__ 
7.s:· 
/ 
v/ 97% 
17 
_lQ__ 23 
13 
~6·7 18 
lh'2% 
8"/ 
I v 100% 
_u_ 
16 
1---
18 
34 
29 
1 
1 
' 
I 
, 
29 
28 fa= I 
!16" ; 
/1 
' 
30. j 
~~------------------~
1 -·~sg~zy/--~~~~-------
j 
1
1 
~~~ 
i 
-:::j 
I 
I 
--1 
i 
I 
--' 
I 
_j 
I 
-I 
--1 
I 
I 
_J 
; 
--1 
-
i 
--1 
j 
I 
I 
_:j 
l 
I 
§ 
I 
I 
I 
! 
j 
I 
; 
....; 
--1 
..... 
--' 
I 
--1 
-I 
- -= 
----------- -----
- --: 
--= = 
= 
--= 
= 
- : 
--
etc;._~ 1836-A 
PIOJICI ESTATE MON BIJOU 
I""" NO 
ST. CROIX, U. S. V. I. 
CB-VIM-7 
PLATE B-15 
,......_. 
-
DIVIIION 
ONirALLAJACKSONV ILLE 
rMEET 1 
DRILLING LOC 
SOUTH ATLANTIC 
0,. ~ SHII:ETt 
HeleNe 
CB VIM-8 
I. ""OJilCT 
to. Sill! MO TYfll: OP 81T 
<;~~ R~MJIRJ(<; 
I'<;TATF" KIN RT.JOII 
<;T 
r.ROIX 
V. I 
. v••- """ ••• 
__ ,, .... -... 
~~- x~"1':073 630 1 .. :74 309 
MSL 
U:. IIAMU~ACTUwtlll"l OESIONA !~.or DIUL.L 
I. DJIILLING AGIENCY 
CME 458 (HOLLOW STEM AUGER DRILLING) 
r..r;n rTM 
TNr 
tJ. TOTAL NO. ott ovtlll· 
1 OIITu"••o 
~ UNDtiTU,..&D 
.. MOLE NO. 
~- .... _.. ........ lttl• 
.UfiiiDtN SAMPLES TAitCN: 
_13_ 
~ ... _.... 
CB-VIM-8 
1. NAME OP' DIULLDI 
o•. TOTAL NUMallR CORil IICIUI1 plaStiC _j_arS StOr'!.S 
FLOR RIVERA 
II. llLilYATION OROUNO WAT ... nO grOUndwater 
e. OIRI!CTtON Olt MOL& 
JITAIIT•o 
lco.-t..•Tao 
bv ... TICAL QINCLIN•O 
M. OATIE MOLE 
il0-24-83 
: 10-25-83_ 
o••· II'IIIIOM vafiT. 
greater than 20 ft. 
1'7. ELEVATION TOP OF MOLl! 
144.00 ft. 
7. THICKNESS OP' OYI!R8UROI:N 
18. TOTAL COIItl: IIIIECOVII.flll'f" ,Oft .oRING 
...,86 
.. 
~- DI:II'TH OfULLII:O INTO IIIOCK. 
none 
II'. IIGNATURI: OP' INSf'CCTW t7' k 
~ 
.£... 
Je. TOTAL DEPTH OP" HOLC 
20 ft. 
IGUILL'Rf.IO AIUOO 
• 
...,. 
-· 
CLASSIII'ICATION OF IIATUIJIAU 
'SCORE aox a.. 
(Drill,.. ,..:.•::,":.:. • .,II of 
aLEVATION DEPTH LEGEND 
---
RECOV• IAIIP\.1! 
ERY 
..... BLO~ 
.... i.:l ...... , ... .c) 
.f+ • 
In ~ 
c 
4 
. 
' 
144.00 
= 
Silt, some clay, 11ttle fine 
1% 
4 
= 
sand, hard, trace roots, 
t---
dark grayish brown. 
1 
6 
14 
20.6 
1-:: 
. 
(MI.) 
50% 
~ 
.5 --
Fine sand, some silt, 
~~ 
7 
~ 
trace clay, rock fragments, 
2 lo 18 
5.9 
• 
-
pale brown. (SM) 
-
-
8 
3 -
% 
~ 
~ 
6 
= 
-
L 
3 
6 
13 
29.3 
Silty clay, little fine 
~ 
-
7 
..... 
4.5 : 
sand, hard, light 
% 
"' 
~ 
Q) 
-
yellowish brown, 
2 
5 
..... 
5-:: 
to brownish yellow to 
~ 
r:: C">S... 
4 
17 
43.3 
0 
r:: 
Cl) 
: 
yellowish brown. 
I 
·.- o.--c<:: 
~-
..... ~ 0.. 
-
(CH) * 
"' 
ES:: 
10 
... 
• l'tl·r-
6-:: 
' 
.......... "' 
~ 
7"1 
OJ'<-
..... 
: 
r1l-
r:: 
r::r:: 
QJNOQJ 
-
0.. 
0+-' 
5 r-11-
28 
30.4 
r:: o..r:: 
7-:: 
-o 0 
1/) 0 
1/94% 
... 
u I 
17.5 = 
15 
"'0..+-' 
""'O·r-Q) 
-
C1...--!".-
8----: v:l 
8" / 
_.lL 
ro "0 c..~ 
I ..j,) = .,....., 
/ 
<nO 
"' 
I 
-
I 
6 
14 
33 
22.7 
M C·.-
-
~ 
/~00: 
g .. f' ~ 
-
19 
g-
'-'-N 
t-JL 
~ Q) X.--
-
8" 
EOro 
-
WE-~ 
-
/ 
7 ~ 
36 
28.0 
~ tt) = ;::, 
-
.--.c. CO+-' 
10-.: 
1//100 
tO""=-..tC 
20 
>OMC 
~ 
I '<t 
I 
I 
10.5 = 
z:.-.-3 
-
8" / 
14_ 
11-.: 
8 
_ _30 
55 
32.4 
I 
: 
: 
i 
-
~ 
100, 
25 ! 
12-.: 
8" 
14 
: 
-
-
/ 
9 
17 
37 
35.2 
13-.: 
-
-
100% 
20 
3.5: ~ 
8" 
I 
_lL 
-
14----: 
/ 
10 
_1§_ 36 
31.6 
:. 
/ 
I 
15-= V: *Unified Soils Classificatio ~/ 100 
20 
~ 
symbol and legend reflect 
8"// 
..E._ 
-
lab test data results 
= 
16 -
~ 
11 
18 
38 
34.4 
----= 
/ 100 
.... -
20 
6.5: 
gu 
/ 
18 
17-= 
I 
---
: 
)ao 
12 
23 
52 
31.3 
-
~ 
--
18 -
29 
-= 
8" 
14 
: 
--
19-= 
13 
18 
40 
34.0 
: ~ 
'22 
124.00 20 : 
100% 
'3D 
EM,.~ F~~M 18 36 
JI'IIOJECT ESTATE MON BIJOU 
HOL.E NO. 
PREVIOUS EDITIONS AR& 08SOLETE . 
.. 
(T'RANSLUCEI't, 
ST. CROIX, U.S.VI. 
CB-V Ir1-8 
PLATE B-16 
• 
ltelo Me CB-VIM-9 
JDIYIItOM 
DRILLING LOG 
1 SOUTH ATLANTIC 
INSTALLATION 
ISMCET 1 
JACKSONVILLE 
o• 1 SMUTS 
I • ..,.OJIICT 
to. IIU ""o Tv..,. o• OIT 
SEE REf-'.ARKS 
ESTATE l«ltLBIJOU 
ST. CROIX. V I. 
IZ. MANU·c:,.;t':ss OIUIOJIA' 1011 OP OOIILL 
-
1- DIII:ILLING AO.NCV 
GEO CIM, INC • 
11. TOTAL 110. otr ov1ut~ 
1 CMeTu•••o 
eu.-DEN IAMfJLES TAKKN , 
l ::\ 
&. MOL II NO. (Aa ..__- ....... HHa 
, .. TOTAL .. u •• ,.,. c010o: ooxo:s1-plastic jar storage 
-··-
! CB·VIM-9 
L NAME OP' DIUL.LEIII 
FLOR RIVERA 
II. llLEVATIOJI OIOOUNO WATO:IO 131.21 ft. 
DI .. ECTIOM OP' MOLE 
ta. DATE. MOLE 
!•T••Tao 
ICOMP~cTao 
i 10-25-83 
: 10-25-83 
17. ELEVATION TO .. o• MOLE 134.21 ft • 
7. THICKNESS o• ovt:,..uiOOEII GREATER THAN 20 ft. 
11. TOTAL CORE III:ECOYE,_. F~ 80JtfNG 
79 /) 
J. 
e. Ot:!OTM OIOILLEO INTO IOOCK none 
e. TOTAL OE!OTM o• MOLE 
20 ft. 
II. IIONATUIOE o• INI,.EC~ /?'L h L._ 
GUILL 'Rf~O A8UOO "-"'¥· U,.___ /"" -yP 
aLEVATIOH DEPTH LEGEND 
CLAIIIPICATI"ON OP' MATE.IUALS 
""'"-'-~ 
~ CORE eox OR: 
III:ECOV• 
SAMftLI: 
134.21 
~+~ 
• 
4 
= • /Silt, some clay, rock 
=/, 
fragments, little fine 
1-::~ sand,.compact dark 
- • 
grayish brown. 
= • 
(GC)* 
2-1 • _,/ 
=l""_ 
3-=l/.·, 
= 
UY 
NO. 
. 
' 
1 
11"./ 
2 
/ 
61% 
6" 
3 
4 
r---
5 
r--
9 
8 
r---
10 
r----
12 
14 l 
44 
I 
. 22 1 
i ' 
= . 
4-
.I 
4. 5 -:==t-·7'· /'.__~:-=---:----,....,,-:-:---:--:-:-:-:-----i 3~. ~? 
s-=_V/ Silty clay, stiff, little 
12 .. 
• 
very fine sand, few t·ock 
4 
-
fragments. (CL) 
=/" / 
67~~ 
6-::/ / 
7 .:" / 
11" 
-~~// 
~~ 
5 
-% 
17" 
8~ 
Siit, some clay, little 
-% fine ;and, very stiff, 
9--= 
light olive gray and 
6 
7 
16 
- _,90-...,--- - ---: 
__ 6-
! 
-
brownish yellow to 
10~%% pale yellow. 
= 
(CH)* 
11~% 
12~% 
=(/*Unified Soils Classifica-
13-::~ tion symbol and legend 
: 
reflect lab test data 
-v.: results. 
14-:. 
= 
15~v. 
=~ 
::jy 
.. ~0 
18" 
7 _a_; 20 34.8 
1.00% --
17" 
I 
12---i---....,; 
9- i 
S4% 
16" 
8 
9 
11 
24 
13 ___ _ 
5 
; 
--I 
8 
! 18 
89% 
10 
18" -- -·-· ·- ·----+--. ..-, -~ 
_!_ 
, 
I 
100% 
10 f- 17: I 
14" 
I 
_}_ 
11 
~--J 18 
---- __ 9·:__-+---1--t 
78% ·-
18" 
9 
12 ~ 
29 
---
. 100% 
16 
~~--~/-~~1-0-+--t--; 
13 
12 
29 50.6 
r--
:/ 
~ 
19~f' / 
14.21 
20 :// 
100% 
17 
~ 
PRO.IECT 
I z: 
I 
3: 
ESTATE MON BIJOU 
I HOLE NO. 
ST. CROIX, U. S. V.I. CB-VIM-9 
~TRANSI..UCEN7? 
PLATE B-17 
'd 
-
OIVISION 
INSTAt.LATION 
ISHEE T 
l 
DRILLING LOG 
SOUTH ATLANTIC 
JACKSONVILLE 
o• 2 
SH!:!:TS 
1. ~lllOJECT 
10. SIZE ANO TYPE: Of' 81T 
SEE REMARKS 
ESTATE MON B!JOU, ST. CROIX, U.S. V.I. 
II. OA Ull • .,.. U<VATOON >HOWN 
rw11 w IISL) 
• L.OCATION (C.-4...,_.., s._,.._, 
~1<;1 
V: 1 n711 <;On 
V= 711 Ql;<; 
12. MANUP'ACTUIIIIER'I DESIGNATION OP' DIIIILL 
I. DIIILLIIIG AGKOICY 
CME 45B(Hollow Stem Auger Drilling) 
GEO CIM 
INC. 
fl. TOTAL NO. OP' OVI:"· 
1 OI•Tulll:aa.o 
! U..OI8TU._ai[D 
4. MOLl: NO. (A• .,_._. ......... Uti•! 
CB-V IM-10 
.UIItDEN SAMfltL.I:S TAKEN ! 
?~ 
...,,, ..... _, 
; 
L NAME OP' OfULLE" 
I<L TOTAL NUIIBEII COllE BOXES 1-DlaStiC .iar StOraQi 
FLOR RIVERA 
10. ELEVATION GIIOUNO WATEII remarkS Sheet 2/.2 
•• DIINECTION OF MOLE 
j•TAIII:T&D 
IC~Lir:T&O 
1e. DATI: HOLlE 
j 10-25-83 
i10-25-83 
IJY&ItTICAL QtNCL.IN&D 
oa•. II'ROM 'VIr:RT. 
7. THICKNESS OP' OVE .. BUIItDEN greater tban 35 ft. 
17. ELEVATION TOO' o• HOLE 133 • 32 ft. 
II. TOTAL COAlE RECOVERY f'QIIII BOIIliNG 
tl~ 
' 
a. DE"H DfULL.EO INTO IIIOCK none 
11. SIGNA TUllE o• INSPEC~ t:7 ~' L..tf?'.. 
!'• TOTAL DE..-rH OP' HOLlE 
15 ft 
GUILLERMO ABUDO 
. .,. f<'"7V 
ELEVATION 
DEPTH L EGIINO 
CLASSIFICATION OF MAT DIALS 
'ICOIIII: aox 0111 
(Drur,.. r-!11:!:..Kt:" •. .,.,, of 
(D _ _.,,_., 
IIII:I:COV· 
SAM~L.II 
ltiiY 
NO. 
LO~ 
\f.'" • ....,,e-.J 
. 
~ . 
4 
. 
I 
133 .• 32 
-
I: I 
Silt, some clay, little fine 
~ 
6 
= 
sand, hard, trace rock frag-
1 r-s 
1-= 
ments, dark grayish bro~m, 
r-- 18 13.1 
' 
- I 1 I 
white silty concretions. 
10 
-, 
% 
-
(ML) 
~ 
2 -
! ! I 
r-1--
-= = 
2 ~ 
17 
3 -
9 
130.;:\2 
' 
= 
~ 
R.: 
~ 
-
3 
4-= 
Silty clay, trace fine sand, 
r-L-
1g 
= 
hard, rock fragments, 
% 
12 
-
dark brown to olive brown [:{, 
6 
s-= 
~ 
to yellowish brown. 
ru-
= 
(CH) * 
4 
28 
14.3 
-
r--
6-= 
16 
.... 
z 
"' 
...: 
= 
10 
"' 
~ 
r--
.... 
"' 
= 
5 
12 
c cnO.. 
26 
o c: E 
7-
-
.,.. o ro 
= 
*Unified Soils Classifica-
14 
.... ~"' 
% 
"' 
-
tion symbol and legend z 
... 
• c: ... 
_l_ 
+-'+-'0 
8 -
reflect lab test data 
QJ 'P-
0 
c 
1-= % 
c: 
c.·~ 
results. 
6 .lL 
OJN V> 
-
25 
c. 
.... 
-
c: .... c: 
9-= 
14 
'"C 0 .,.. 
QJ 
n 
... 
~ .... 
ma.o.c 
-
:;(, 
.2§..._ 
"g~"'8 
-= 
~ 
"'-o 
7 
.l.L 
....,= 
0 
~ 
28 
V')00 cu 
10-= 
M: .... 
15 
E 
N 
10 
= 
I 
0 
3: 
z 
11 
....... )( 
11-= 
.._ ~ 
~ 
12 
CliO 
"' - ... 
= / 
8 
27 
20.4 ::s "'= 
::;, 
-
r-..CCO+o) 
-
m :w::........., ro 
15 
>OM C 
12 -
"' 
1 .... 
1 
I 
121.32 
z 
z.,.....,....3 
= 
Silt, little clay, little 
11 
-
very fine sand, hard, white 
9 ~ 
13-= 
and brownish yellow stains. 
r--
45 
-
(~1L) 
119 .s:: 3.5 = 
o/ 
25 
14-= 
~ 
z 
~ 
= 
10 
-
Silty clay, trace fine sand, 
r--
51 
15-= 
hard, mixed white silty 
100% 
27 
. 
= 
concretions, light yellow-
~ 
!j 
-
~ 
ish brown, few rock 
11 
~ 
16-= 
fragments. 
r--
47 P3.5 
-
(CH) 
27 
6.5 = 
-
z 
~ 
17-= 
= ~ 
12 ,.n_ 51 
-
28 
18-: 
% 
= 
~ 
13 ~ 
19-= 0 
2o 
38 
9.5 = 
% 
113.32 20 = 
/ 
14 
14 
EMMGA!~~M 18 3 6 
PROJECT ESTATE ~10N BIJOU 
l~OL£ NO. 
PREVIOUS EDITIONS Allll:ll O-.oLIETE. 
ST. CROIX u.s.v.r. 
B-VW-10 
(TRANSLUCVIT) 
PLATE B-18 
DRILLING LOG (Cont Sheet), Hrv~oriON !OP m I-4Qlt 
13 3. 32 ft. 
Hole No. 
CB- V Ir~-10 
I'IOJfCl 
, INS l AUA liON 
1 ~ttT --z· 
I 
ESTATE MON BIJOU, ST. CROIX,V.I. 
JACKSONViLLE 
I 0' 2 '""'' 
CLASSifiCATtON OF MATUlAlS 
'4 COif lOX 01 
REMARKS 
flfV .. TION 
Dfi"'H 
LfGfND 
( Dn~n/Uioll) 
RECOY-
SAMPU 
(Dr.Jb"l ''"''· .... .,,, /~u. "'IJth uJ 
t •• 
ftb 
fRY 
Nt: alow~'"'hrn .. ,-. '"·· •I .,,,,fi, .. ,.,1 
c 
d 
. 
N 
W s 
• 
13.32 
-
Rock fragments,some silty 
18" 
~ 
-
' 
fine sand,pale brown,little 
14 
53 29.4· 
-
2' - • • white silty concretions.(GM) 
100• 
29 
-
~ 
~5" 
W2 
. 
-
Siity clay,trace fine sand, 
-
I 
2~ 
hard, light yellowish 
I 15 
26 
56 
2.5 : 
brown to pale yellow. 
83% 
30 
2~ 
~ 
(CH) * 
8" / 
~ 
: 
I 
16 ~ 
62 
2~ 
/100% 
35 
: 
~ 
*Unified Soils Classifica-
8"/ 
~ 
2s-= 
tion symbol and legend 
/ 
17 
-~ 36 21.5 
-
reflect lab test data 
100~ 
18 
5.5 : 
results. 
2u-: ~ 
r6 .. I 
~ 
: 
18 
.~2 52 
: 
I 
106.32 
89% 
I 30 
2 -
: 
Clayey silt,some fine sand, 
8" 
_.14.. 
rock fragments, stiff, 
2a-: 
yellowish brown 
(ML) 
19 
_g_3 
88 
128.5 -
·,nm~ 
"" 
2~ v 
Silty clay,some fine sand, 
8" 
23 
hard, light yellowish brown. 
-
(CL) 
20 I 
33 
02 
--
I 100% 
69 
103.32 
3lT--l/ 
Silty clay, some rock frag-
6" 
I 17 
Ground 
: 
ments,little fine sand,stiff 
I 
water 
31-:: 
to mediu(ci)llowish brown. 
21 
24 
67 16.5 first 
~1.5 -
RQ'l: . 
-~; 
noticed. 
-
Silt,some clay,little fine 
8" 
___l.8_ 
32-: 
sand,rock fragments,compact 
-
friable,light yellowish brown 
22 
__35._. 82 
: 
(ML) 
100 
47 
3 -
~ 
Silty clay, trace nne sand, 
~4" 
-
hard, light yellowish 
_lQ 
: 
34-:: 
brown. 
23 
_j£_ 31 
~0 
-
(CL) 
_li_ 
- / 
-
tnn'l' 
?3 
98.32 
35 -
: 
NOTE: 
-= : 
Groundwater noticed initial y at ~ 
: 
30 feet depth. 
The hole co lapse , 
--: 
however, and a final water evel 
: 
could not be taken after 24 hours 
_: -: 
_: 
: --
-= : --:: 
: 
_: 
I I 
: 
: 
-= : -
ENC:.. ~RM 1836-A 
aro. ,..,. o.--u.•-a•s 
NO~ ESTATE MON BIJOU 
~HOU NO 
ST. CROIX,U.S.V.l. 
B-VIM-10 
PLATE B-19 
HeleNe 
CB-VIM-11 
I
DIVIS!ON 
INSTALLATIOJNACKSQNV!llE 
lSHE~,T ] 
b-=D"'R""I"'l.,..L_IMG 
__ 
L_OG_--l'---S_O_UT_H_A_T_L_A_N_T_I_C ___ +----------- -·--___,.-JL::o::•...;:.....:.:.•H.:.:•;.:•..;..T::_• 
1 . ..,.oJECT 
oo. sou AND Tv"" o• e1T 
. See remarks . 
lr-:!;:ES!,!,T;:AT;,;E:,-;;:MO~N~B~IJ~Q:!::U+.-::;S;.:..T.;.• ...::C::.;R:::;O I:.:;X:..!.,_V:....:•:..:.I.:..• --~1"· DATUM f'OOI ._._._, 
ouw!IMOWN ,.,.. • JGJ.) 
Lxoc:Tl-'-o·
1~74 
640·--v··:.--74 780 
M<:l 
1.1. MAMUP'ACTURCWI DllSfGNA ION OP OlltiLL 
.. DIIILLING AGENCY 
CME 458 
__!iEQ CIM 
INC. 
11. TOTAL 110. OP' OYEIII· 
JDtaTu~~~~:•ao 
: UNOiaTuiiii•ED 
8URDEN &Alii--LEI TAkEN! 
23 
-
&. HOLE NO. (A• _,__ ........... fffle 
10. TOTAL NU-EIICOIIE ..,XO:S 1-olaStiC .iar StoraqE 
_.,___ 
[ CB-VIM-11 
L MAlliE OF DIIULLDI 
FLOR RIVERA 
Ia. ELEVATION GIIOUND eAT"II 117 • 85 
1-- Dllti:CTIOM OF HOLE 
••. DAn HOLE 
lio~26~'83 
! 
clo~~6~'83 
7. THICKNESS OF OVEII.UIIDIEN greater than 35 ft • 
17. ELEVATION TO .. OF HOLE 136 • 22 ft • 
~· DEO'TH DIIILLED INTO IIOCK 
NONE 
11. TOTAL COfll£ RII!:COYI:IIIY f'OR 80"1NG 
65% 
, 
'\ 
~·TOTAL DEO'TH o• HOLE 
35 ft. 
II. liGNA TUllE OF INSPECT~ U ~. 
/.Y. r, 
I GUlli FllMO AILJDO 
(;47_ UA#e 
CLAaiP'ICATION OP' MATI!fUALS 
'It CORE BOX OR 
ELEVATION 
DEPTH L.EGI:ND 
(D ... ,.,_., 
"'ii~\1-
--=~~~~ 
ft. • 
lft. ~ 
c 
4 
o 
I 
136.22 
: 
very stiff,· dark grayish 
-
Silt and clay, some f1ne sane~ 
1_: 
brown. 
{MH) 
-
13.8: 
134.72 
1.5•-,· -=HH-t+-----------¥--=~%~--+-=-+-----+--1 
2'-= 
1 1 
.5:"'/ 
.--
Si ty cay, trace fine sand, 
: 
hard, few rock fragments, 
-
yellowish brown, white 
3_: 
silty concretions. 
;' 42% 
= 
{MH) * 
: 
4-:: 
: -
5-:: 
:. 
6-= = 
-
7_:::. 
= 
-
8_:::. = = 
9-:: 
= 
-
10-= ---
11-:: = 
i 
-
12-= = 
-
13-:: 
= 
-
14-: ---
15-: -: 
16-: -: 
17-: 
: -
33% 
" / 
6% 
P" 
·-· 
11 
-· 
12 
f-- 5_ i 
5 
12 
.:.7 ___ ;__ __ ~ ...; :5 
s- 4- oc-:c. 
..., 
0. 
6 
W N 
V1 
~ 
6 
c:: 
·~ 
13 
16.4~:5~...., 
7 
~c:: 
\j a. c.. Q) 
----- s.. 0 
Vl-+-1 
7 
9 
20 
"' '-
c:: 
"'0""0 
.. 0 
c:: 
ou 
tti= 0 
...,0 
.. 
1./) ("""') = Q) 
11 
E; 
._ N ~ 
-
·------ 0 
!-
X 3 
.. Q) 
4-:;0,-
5 
9 
17 
8 
s-rc 
Q) "' 
.. 
=..c:: ::. 
,--
c.:-> 
"':i~-.........~ 
>C·M t:: 
'<::::r 
I 
I 
5 
~ ---- z: ................. :::: 
8 
19 
16.1 
11 
JL 
11 
22 
_.Jl~~-­
] 
La- 23 
15 
~ 
~29 
11 
6 
1----
9 
20 
11 
9 
f--.--: 
11 
24 
14.9 
-
Silty clay, little fine sand 
118.22 
18 -v 
_Q_% '-.Jo·---l_;;13:o.__ __ ·-
= 
some rock fragments, little 
19 =v roots, olive gray. 
(CL) 
116.22 
20 : 
EM .. ~!~~M 18 36 P"EVIOUS EDITIONS A"E OIISOLETE. 
(TRANSl.VCI!N7'.) 
PLATE B-20 
5" 
/ 
/ 
/ 
/ 
/83% 
--·-
P"OJ~CT 
W-
13 
8-
21 
14 
_13 - --------< 
5 
' 
ESTATE MON BIJOU 
lHOL£ NO. 
ST. CROIX, U. S. V.I. CB-VIM-11 
e 
DRIUING LOG (Cont Sheet)'""'"'
10
N '
0
' Of 
140
" 
Hole No. CB-V!M-11 
INSTAU.ATION 
MON BIJOU 
ST. CROIX U.S.V.I. 
JACKSONVILLE 
, SHffl 
IUVA!ION 
Dt!P!H 
LEGEND 
b 
116.22 
115.22 
21 
22 
23 
24 
25 
5.5 
26 
10g,22 
27 
28 
29 
30' ~ 
31 ---=1 
=1 
I 
-1 
: 32 ---=1 
103.72 S2. 
CLASSifiCATION Of Mlo!UIALS 
( Dntrill-} 
d 
Silty clay, rock fragments, 
very stiff, white silty 
concretions, dark gray to 
olive brown, pieces of 
wood on sample 17. 
(CL) * 
% COllE lOX 01 
lE .. AitKS 
RECOV-
SAMPLE 
(Dril/"'1 ""''· w~1,,. l .. u. tltptb uf 
ElY 
NO. 
.,,.,,,""'· '''·· if "1"''"••1 J 
r 
24 
*Unified Soils Classificationl'-;~:.;....-~~::._1--1--1 
symbol and legend reflect 
lab test data results. 
Silty clay,little fine sand, 
very stiff,little rock frag-
ments,white silty concretions 
dark gray. 
(CL) 
Silt, some clay,little fine 
sand, medium,yellowish brown, 
and gray,little white silty 
pockets. 
( ML) 
.Silty fine sand,trace clay 
23.4 
26.4 
24.1 
33.8 
' 33 ----= -
~ brown i s h ye 11 ow. 
( s c ) 
-3----+----------~24" 
102.72 33.5 
I 
iclayey silt,little fine sand,•l' 
! 34 
I 
I 
stiff, pale yellow. (ML) 
1 
39.4 
101.22 135 
-1 
_J 
__, 
-f 
-! 
End of boring 35'-0" 
ENC:,.. ~ 
1836-A 
HOLE NO. 
CB-VIM-11 
PLATE B-21 
H.leMe CB-VIM-12 
DRILLING LOG 
DIVISICSOUTH ATLANTIC 
INSTALLA ...... JACKSONV ILLE 
I._N_OJECT 
ESTATE MON 8IJOU, ST. CROIX, V.I. 
10. SIZE MD TYN Of' GITSDl it SDPOn SampJ er 12ft. 
• UAI- ,_ 
Oft ..... ft <••---
MSL 
L NAME OP' DltiLLIIR 
1&. TDTAL IIU-ER C""E IIOXES 1-fOr plaStiC jarS 
FLOR RIVERA 
IL ELEVATION GRDUIID WATER 
not enCOUntered 
.. DI .. ECTION 01' MOLE 
f8TARTaD 
I COMPLKT&D 
ll:JvallltTICAL. O•NCLIN&D 
... DATE MOLl: 
i 10-26-83 
: lll-09-83 
?. THICKIIItSI DF OVERGURDEN Qreater than 35 ft • 
1?. ELEVATION TOf' OF HOLE }37. 99 
II. TDTAL C""E RECOVERY F .... -IIIG 
78% L')_ 
11. SIGIIATURE OF INSP~ 
./.7"_/_ .L.£--:::. 
~· DEI"TH GRILLED INTO ROCK nO rOCk drilled 
le. TOTAL DEI"TH OF HOLE 
~<; ~t 
~liT! I F~Mn ARIIM ~/~ 
""' 
137.99 
• 
: -
1_: 
: -
2_: = 
-
3-= = 
= 
4---: 
CL.AUIF'ICATION 0, IIATUIALS 
(D-~...., 
4 
Clayey silt, little sand, 
stiff, weathered rock 
fragments, white to 
olive brown. 
(ML) 
~.5 ---t--r--+-t----------1 
5 -::V 11 
=v.~ 
6---= 
. 
-
' I 
7 -=11// 
I =1// 
.s--::1// 
: 
:: 
/ 
Silty clay, some sand, 
soft to very stiff, 
weathered rock fragments, 
white. 
(CL) 
4 
r-
~ 
14 
8 
8.8 
8.2 
128.99 
9 -::t=--:------ir------------+--~ 
: 1 
: 
Silty clay, some sand, 
10 _: / 
/ 
hard, weathered rock 
: 
/ 
/ 
fragments, brown to 
:i/_'/ j olive brown. 
11 -
I" 
(SC)* 
-
,• 
I 
: 
. I 
I 
..J 
112 -v--
·~~---~~48~---- ---
= . 
-
~ 
~3. 
i 
13 ---= 
~~ 
4~_-J112 
9.8; 
- 'I 
: '/" 
_6:r_4 ___ -li 
4 =(;;), *Unified Soils Classifica-
• 
-
J 
o 
tion symbol and legend 
_.A!L! 85 
10.3 
5 _:!%· reflect lab test data 
45 l 
: 
' 
, 
results. 
15 l 
6 
: 
-i 
35! 75 
---= :, • 
40' 
7 ~~ 
~135 
8 1v·: 
~ 
60 :19.4 
9 -_ .: _() 
1-
' 
1. 
19.5-
1 '/. 
31 l 
2L 
20.6 I I 
! 
16.7! 
I 
I 
i 
I 
117.99 11o ·: /---' 
27 I 
ENGFORMJ836 
~L-------------------------~ .. R~o~J~E~cT~E·S~T-A-T~E~M~Q~N~8~I~J~Q~U~~t~;"~0~L7E'H~o~---
MAR ?I 
PREVIOUS EDITIONS ARE OGSOLETE. 
i:l-Vlil,-lL 
(TRAJ'ISLIJCI!NTJ 
ST. CROIX u.s. v. l. 
PLATE B-22 
DRILLING LOG (Cont Sheet)j"rv.riON ro• Of""" 137.99 
Hole No. CB-V!M-1£ 
I'IOJfCT 
tNSlALLATION 
ESTATE MON BIJOU 
JACKSONVILLE 
i 33 
~· 
34~ ,: 
-I, 
CLASSifiCATION OF MATERiALS 
(fh'""'IM) 
d 
Silty clay, some sand, 
hard, weathered rock 
fragments, brown to 
olive brown. 
(SC)* 
*Unified Soils Classifica-
tion symbol and legend 
reflect lab test data 
results. 
%COlE lOX 01 
IECOY· 
$AMPLE 
IE MAl ItS 
flY 
NO. 
(O,.;u,, ~~-~. w•Ur J.u, .,,lb 11/ 
.,.., •• n,. "'·· ;,.,,.,fu••'J 
f 
Blows 
N 
sW 
* 
.... 
¥-~~----~~~--~----~ ~ 
: 
100~~ 
! 47 
.. ------·-- ---1 
-
10" 
~-
34 :25 
I 
75 
30 
1 
i 21 
I 
I 
~0/6" 10 
, 5£1__, 
__ Auger__ 
r, 2" 
, 48 
i 22 '42 
87 
11 
67:; : 
45 
24" 
44 
; , 
i 
: 50 : 
: 23 
:---43 
93 ;18 
'r:b 
u 
"" .., 
.... 
"' 
~ 
..... ..., 
00 
>,o 
"'"' 
)CO 
"'~ 
......... 
<I> 
<1>'0 
.... c: 
"' 
--
U') 
"" 
OJOO 
~' 
000 
.<:::0 
"' ' 
.__ 
o-
..o c: 
'OQJ 
c: OJ 
0): 
U+J 
QJQJ 
V'l 00 
; 100%
1 
r---: 
35 --!--+-------------:---1--------+-j)~ _ 
__j_ _ 
_l__ 
i 
102.99 
. ''/ 
ENC:,.. ~llM 1836-A 
This boring was drilled originally to 22.5 feet depth 
between 10-26-83 to 10-28-~3, and stopped due to hard 
clay encountered. 
Because 'it was definitely not rock, 
the boring was relocated 5 'feet <~long <~xis toward 
boring CB-VIM-11 and redrilled w~th au~'ers to 21 feet 
depth. 
Sampling was then riesume~ to t e required 
35 feet depth. 
This secon bori g was drilled between 
11-08-83 and 11-09-83. 
I'IOJOCT 
PLATE B-23 
ESTATE MON BIJOU 
ST. CROIX, U.S.V.I. 
..olf NO 
CB-VIM-12 
DIVIoi-
DRILLIMG LOG 
SOUTH ATLANTIC 
JACKSONVIllE 
1:r_T .!nTa 
.... 
o.~ ..... 
ESTATE MON BIJOU, ST. CROIX 
V.I. 
10 .......... TY .. OP WIT 
SEE REMARKS 
1- DfiULLIIIO AOaNCY 
GEO CIM, INC • 
._ NOLa 110. f.Ae .,__- ....... HII•J 
-··-• 
! CB-VIM-13 
I. NAME OF DRILLER 
10. TOTAL NU ... EIO COllE IIOXU1-Storaoe olastiC jar; 
FLOR RIVERA 
11. ELEVATION OIOOUND WATEIO 
QQ 1' ft • 
a. DIRECTION OF MOLl: 
ta. DAT& MOLK 
b.I8TART•D 
IC~L.·T·D 
0-26-83 
: 10-27-83 
.. 
7. THICI<NEII OF OVEIO.UIOOEN greater tban 25 ft • 
•. OE..,.H OIIILLEO INTO IOOCI< 
NONE 
I. TOTAL DE..,.H OF HOLE 
25 ft. 
17. ELEVATION TO,_ OF HOLE ~50 ft. 
11. TOTAL COllE IOECOVEIOV FOil -lNG 83% 
II. IIONATUIOE OF INI,.ECT~ ~ A£.. L .v: 
GUILLER~IO ABUOO 
~- u-.,. ..... /- 1
._ 
97.50 
106.50 
= 
Silt, some clay, little fine /O" 
_5 
_ 
sand,hard, few rock frag-
1-= 
ments, dark brown. 
1 
~ 
22 
9.4 
-
(ML) 
12 
.5~-~~~-r--------------------~---r---t~~--t--; 
2-=/ Silty clay, trace fine sand, V" 
4: 
=/: hard, yellowish brown, 
2 
10 18.6 
-
trace rock fragments. 
3 -
(CL) 
j::l" / 
10" I 
...._L 
4-=:// / 
3 ~ 
102. oo ~. 5 .... =-+>"'--.......JI------------+-I/ __ +---+-1=-9--f--+--t t; 
~ 
5-=' / 
Silt, little clay, little /5" 
__E_ 
~ g' ~ 
::/:/ 
/ ~~~:ds~~~k ~~~~m!~i::· 
4 
-~ 34 
8.3 
g.:;~ 
6-==v light olive brown. 
-18 
~i ~ ... 
(CL)* 
15" • 
14 
a; N :n"' 
-
"' 
-~ 
-
5 
14 
29 10.6 
CIJ "' .... 
~.~]/:/ 
/1" 
15 
ii=l 
v- = 
e-!?_ 
., = 0 
-
6 
}l__ 29 
9.0 t;g= ~ 
= / 
16 
E 
"'-:t: 
9 
05-X~ 
=vv Silty clay, little fine 
11/5" 
r-1--
: ~8~ 
_ 
sand, hard 1 i ght o 1 i ve 
7 
9 
20 
g 8 
:::1 .c -
:::1 
1
1 n-..:::_ 
b 
1 . 
,__;_.__ 
1 . 
~ 
.. ~- ~ ...... 
•v _ 
rown, mixed o 1ve gray, 
, --
~ ~ 
,-r / and pale yellow, trace 
11 
>o...,"' 
l:J~ "'' '"'~~l'. 
1 8 ~ 
49 
~ ~ ~ ~ 
1~v 
18'/ 9 w_ 14 
93.oo 
13 5= 
~oo~ 
7 
· -
/ 
Silty clay, trace fine sand, z 1 11 
14-::~ ~ very stiff, light olive 
~ 
= ~ 
brown, trace rock 
10 
f-.11--
21 
_ 
fragments. 
)~ 
10 
• 
15-:: ~ 
( CH }* 
1'--=T---+~__.;...+--+-'---i 
-
~II / 
-
. 
16-=~ 
*Unified Soils Classifica-
// 
11 
f.J.z-
25 
39.1 
-
tion symbol and legend 
/
10m 
1
::~ 
16.5:~ reflect lab test data 
1"-~""'t---+-'..._+--t----t 
17-= 
results. 
18" 
I..J.Z._ 
~~ 
"" 12 ~ 
29 
::]vv 
1
:.. 
13 ~ 
23 
19. 5 = 
~QQ.%_ 
llJ...-4--t---1 
86.50 
_20 -
6 
27 
9.6 
EMM~!~~M 18 36 
P"EVIOUS EDITIONS AlOE ODIOLETE-
'""OJECT ESTATE MON BIJOU 
I HOU NO. 
ST. CROIX, U. S. V.I. 
CB-VIM-13 
('TRANSLVCillf" 
PLATE B-24 
.. .;~ ... · _ .............. '""".....,_'l' ' 
I 
I I 
I 
i I 
I I I I 
DRIWNG LOG (Cont Sheet)l'..,.,_ ""or HOU 
li.J6,.,v 
NOJOCT 
I 
NSTALLA'hOH 
ESTATE MON BIJOU 
CU.SSifiCATION Of MATERIALS 
ElEVATION 
DEPTH 
lEGEND 
ro..m,.iooJ 
ft • 
ft b 
c 
d 
86.50 
: 
~ 
Silty clay, trace fine sand, 
: 
very stiff, trace rock 
21-= 
fragments, olive brown to 
= 
~ 
yellowish brown. 
. 
22-= 
(CH) 
: -
23-= : % 
-
24--= : 
: 
81.;60 
25 -
: --
= 
= 
- ---
I 
-
~ 
-----
-
= 
--
-
= 
--
-= : 
-= 
:: -
--= 
= 
= 
--: 
: 
-
--= ---
--= : -
- -: -
--= ---
- : 
= 
- -: 
-= : -
-= 
---
-= 
= 
--
ENC:...~ 1836-A 
011'0. , ... or-u•·a. .. 
PLATE B-25 
Hole No.CB-VIM-13 
JACKSONVILLE 
r"' 2 
Of 2 SHEETS 
'II. COlE lOX 01 
REMARKS 
IECOV· 
SAMPLE 
(Dr;u,., ,;,,, w•'" l11u. t11ptb fl/ 
ElY 
NO. 
~, owS·'•N'"'· ·I(~ ''W'''"fi'~"'' 
• 
f 
1~/ 
9 
i 
14 r-----1 19 
i3~.1 
/loo% 
10 
I 
-
-
18 -~ 
I 
IZ 
-~ I 
15 rlL 39 I 
% 
25 
t:2:. 
! 
IlL_ 
16 r1L 30 
i 
% 
17 
y 
17 .lL 29 
42.9 
13 
I 
I 
I I 
! 
I'IOJICT 
!"""NO 
CB-VIM-lc 
................ .&0 ,- .A.'"T 
DRILLING LOG 
I OIVIIIOOISOUTH ATLANTIC 
IIMSTALLAnooo JACKSONVILLE 
I:··,T 1 
1 .., •• n 
. ~OolllCT 
tO. IIU: MD TYN CW .IT 
<;.!;!; 
lli'Ml!.DII"C:~ 
OC:Tl!.TI' MriN R l.lnll 
. OAT- ......... MSL 
• ltRIWK ,...--~ 
fL LOCATIOtl (~--·-
X= -1- 075 774 
Y " 74 514 
IZ. MAMU~ACTUR~R"I DllSIOIIATIOII M DRILL 
~~DIULLIMO AGaNCY 
CME 45B (Hollow stem auoer drillinol 
EO CIM, INC. 
tl. lg~~~ .. ·:a::Ltli:TRAKaN~ 018T].3a&o 
! 
UNDnTUflla&O 
1&. MOLE NO. (Ae .... _. • ...... tlllif 
-•·-
l I':R-VIM-14 
L MAllE OP' OIIIILLEfll 
10. TOTALIIUM.IliOCOIIIliiOXEIJ-nlA~tir iarc ~tnra 
FLOR RIVERA 
11. llLEVATIOOI GROUND WATilR R< ?7 ft • 
a. Dfiiiii:CTION OF MOLl: 
~t·r•o 
fCOIIJII't-&TKD 
I[Xv&ftTICAI. QINCI..INaO 
1&. DATI: NOLa 
0- 1-83 
ll-9-B3 
0& •• IIPAOM YCAT. 
7. THICICNI!IS OF OVEIOWUIODEN oreater than 20 ft. 
17. ELEVATIOOI TOO' 0~ HOLE 91.96 
ft. 
11. TOTAL CORE .. I:COVI:RY P'OR 80RING 
55% 
' 
je. DE"M DlltiLLI:D INTO IIIOCK 
none 
tt. IIGNATUitl: OF IMIP'I:CTORWd'~ ~ 
j.. TOTAL DEO'TH OF HOLE ?n i't 
Guillermo Abudo 
IELI:VATION 
DI:~TH LEGEND 
CLAIIII'ICATION OP' IIIATIEIUAU 
'1. CORE IIOX 011 
fDrut-. ,_.:•.=:.K! ... :.,,. ot 
(IJ ___ ...., 
RIECOV• SAMPLE 
lEftY 
NO. 
1 n~(f-'J'•~ 11 • ...,,.c-J 
. 
~ . 
4 
. 
f 
• ~L~bft 
: 
Silt, little clay, trace 
~ 
~ 
-
fine sand, hard, dark 
1 
J_ 
1-= 
brown, white silty 
10 17.8 
concretions. 
(ML) 
.. 
: 
% 
5 
.... ;, 
"' 
-
IZ 
"' 
r:::: 
2-= 
~ 
.... 
0 - ... 
r:::: 
"' 
= 
2 
6 
21.0 
0 
....;o. 
: 
f-..-·-~ 12 
.... '+-E 
6 
"' 
"' ... 
88.96 
% 
... 
N 
VI 
3 -v 
IZ 
.... 
"' 
~ 
"' 
r:::: "' 
-
Silty clay lumps, very stiff 
r:::: 
00 ...., 
= 
"' 
0 
fine sand, >leathered rock 
3 
10 
22.9 
0.. 
0.. "' 
31 
Ov> "' 
4-:: y 
fragments, olive gray. 
1---
"' 
M 
...., 
21 
... 
...., "' 
.5 : 
% 
"' 
C"l·~ 
0 
(Boulders 
noted in 
~ 
"' c-
u 
-
25 
r:::: 
·~ 0.. 
s-:: 
difficult drilling). 
"' -"' s.. 
[/ 
~ 
.... ';Oo 
Q) 
(SC)* 
4 
"' 
...., 
:: 
75 
14.2 
.... f' "' 
1---
E 
3 
- ~/ 
22% 
23 
0 
S..N 
6-
s.. "' -
/ 
'17 
.... 
~~ "' 
-
'aJ 
s.. 
-
..,_ 
::::> 
: 
0 
1--
"' .c: 
...., 
::;¥'// 
5 
21 
';0 
co "' 
7--: 
43 
15. 
........... "' 
--
> 
OM 
(V~ 
22 
I .... 
I 
II 
.5 = 
z 
.......... 
3 
a-= 
% 
I __!I_ 
: /y 
6 ~ 
51 
9.7 
-
9-= 
t) 
11% 
21 
;?::! 
: 
z 
31 
t) 
';0 
1---
-
14.6 
10-= 
I) 
7 ~ 
53 
...., 
= 
o--
1Q 
"' 
' 
·~ ,..; 
01.46 
0.5-v 
~ 
"' co 
u-= 
~ 
QJI --
-
Clayey sand,some silt, mixed 
22 
-M 
-r:: 
8 
47 
24.~ 
·~ I 
-
weathered rock fragments 
21i 
s..o 
"' ..... 
12-= 
very stiff, light olive 
.... s:: 
= 
brown and yellowish brown. V,: 
9 
.-<O 
I 
(SC) * 
~--
:=::.c 
-
.......... 
13 -v 
9 ~ 
17.~ 
> 
0.. 
56 
'"' 
'-:: 
":In 
"'"' 
3.5: 
1nn• 
u 
83 
"' 
[/,:, 
C'>·~ 
-v 
c.r::: 
14--= 
-
·~ .... 
16.3 ... 
: 
*Unified Soils Classifica-
10 
__; 3/6' 
00 
v 
"' .... 
15-= 
tion symbol and legend 
= 
reflect lab test data li 
Cl> I )( 
v 
results 
50/3 
-eo 
-
_..,,_ 
11 
•.- en c.. 
16-= 
0/3" 
... 
0.. 
-
21 
"CG>c<: 
: v 
7'h 
.... 
C"l Q) .c 
-
II.(. 
45 
r::::-+> 
.,... 0. 0. 
17-= 
'- E cv 
t:; 
12 
ISO 
OO"C 
: 
.cu .... 
1- 82 
31 
......... 
: 
~OQJU") 
<? 
Q)~QJo:::t" 
18-:: 
% 
r:::: 
......... 
14" / 
"' 
II 
1-R 
M•r-0> 
: 
CX).C N 
~ 
13 
31 
I+> 
.... 
-
1;:;% 
51 
16 
C"l 
o ..... 
1----
II 0 +-J,..... 
19-:: 
20 
......... 
U"J 
..... 
C"l ..... 
-
f..-
I 
+-J C::0 
171.9fi 
120 : 
28 1 
!5 ~;:: ~ 
r:::: O..>< 
ENG FORM 18 36 
PREVIOUS EDITIONS ARI: O..OLIETE. 
.... o,acT tsnr "E MON sr.,uu 
IHOL.IE NO. 
MAR 71 
(TRAifSLUCmf1') 
ST. CROIX,U.S.V.I. 
CB-Vm-14 
PLATE B-26 
Hole No C 8- V I M -15 
-
IOIYISIOM 
"RILLING LOG 
SOUTII ATLANTIC 
INSTALLATION 
I SH!:l. T J. 
I 
JACKSONVILLE 
fo•l 
·~ 
10. s•ze: AND TYP~£ o,. en see remarks 
11. TOTAL NO. OP' OVER-
!DiaTutte•o 
J, UNotaTu•••o 
&. MOLlE NO. (Ae .,__ .......... IItie 
•UfiiDI:N IAII~LI:I TAKIIN 
1 
13 
-••·-• 
i CB-\'IM 15 
a. NAME o• OltiLL.... 
14 TOTAL NUII.ER CORE .OXU 1-plaStiC jar StOragE 
FLOR RIVERA 
... ELEvATION oRouNo ... nR no water 
a. DI .. I:CTIOM OP' MOL II 
18TAAT.D 
fCO~~·T·D 
q. DATI: MOLl: 
1 11-02-83 
h.t-02-83_ 
17. ELEVATION TO" OF HOLE 84,14 ft, 
GREATER THAN 20 FT. 
7. THICKNESS 011' OVE .. eUIIIIIOEN 
11. TC>I' AL CORE IOECOVEitY 'OR .CitiNG 
69% 
...., 
~ 
~· DlltaTH DRILLED INTO JIIOCIC 
~· TOTAL DEPTH OP' HOLII 
none 
20 ft. 
II. SIGNATURE o• INS .. ECTOR ~ 
/'7./ LL: 
GUILLERMO AI UDO 
>-'¥-[./A... 
JP ·ru 
IILI:VATION DEPTH LEGEND 
CLAISII'ICATION OP' IIATUIIALS 
ro_.,...., 
ft.. 
~ 
c 
4 
84.14 
-
Sandy clayey silt, compact, 
some rock fragments, dark 
grayish brown. 
= 
1 -. 
L-= = 
2--= = 
-
3--= = 
-
(ML) 
4--= 
3 
_6_ 
79.64 
4. 5-: --=t-+~+----------+--;5~0%4--- ... L +----! 
5--=l/ 
• Silty clay, trace fine sand, 9" / 
~10 
i 
, 
=l:( hard, rock fragments, olive 
4 
10 
25 ' 3 9 
-
small white silty concretion 
,1 · 
6.:...:: /' 
. §OL ,_ __ 1 ... 5,___,'------1 
= • 
(Cl)to(GC) 
.5% / 
fl___] 
7-=. / 
/~- 5 ~ 
29 :7.7 
·-/ 
5" / 
8-=_/ Clayey silt, some fine sand, 
/ 
6 
2 
-
h d 
t 
1. 
1 
k 
1 
h.__ 30 i15.0 
_ 
ar , compac , 1tt e roc 
/ 
En'l': 
lR. 
, 
9-
fragments, o 1 i ve brown, 
.jL~a..}----f.W.-f--""!,r-----1 
=/ 
varies to yellowish brown 
6, 
/ 
_g__ 
--
silty clay. 
~_, 
. 
. 
7 
~27 h4.2 
10= / ( 
CL) * 
!L-'Rt1!:1J.Q'l:f--f11.!L-4-1':---r; --: 
0.5-
6 "/ 
J 
: 
11--=/ 
.5) 
)2_~ 
! 
-
/ 
8 
~_j39 i21.9 
= 
/92% 
19 
i 
12~/ 
a" ;i- ---- ~--t---; 
-
/ 
9 
27 
50 
13. 9 
13-:/ 
i100% 
n-
: 
>-· 
69.64 
4
1~~~-...;;~...,..:./-+------------ll
8
;,-~ 10 
;~---· 
;5--=v-IY. 
• Weathered rock fragments, 
I";;~"""'000;-~---1P:4t....:7_--+i--l---i 
= 
hard silty clay lumps, z 
~9 i 
= • light olive brown. 
% 11 
~
4
· 33 
h· 
16-
' 
(GC) * 
,.-
~~2.5 
-v-
~-1 
: 
• *Unified Soils Classifica-
p: 
,--= 
tion symbol and legend 
;,. 
~
0 
17 : 
y 
reflect lab test data 
12 rn-- 60 
:/ 
• 
results 
50% 
W 
l7 .14 
80 
16.0 
12.5 
06.14 
18 :/ 
layey silt, little fine 
: 
sand, very stiff, trace 
19 -=:/rock fragments, pale yellow 
_ 
o white. (CL) 
64.1~ 
20 : 
24" 
I_£_ 
13 
lu_ 
~ 
33 10.5 
1--
~3 
• 
100% 
IENMGA!~~M 18 36 
PREVIOUS EDITIONS ARE OMOLETE. 
PltOJECT ESTATE MON BIJOU 
I HOLE NO. 
ST. CROIX, U. S. V. I. CB-VIM-15 
(TRANSLUCVV1? 
PLATE B-27 
Hole Ho 
CC- 'I' I'' -l F, 
01\IISION 
INSTALLATION 
DRILLING LOG 
SO UTi; n.TLil.fiT I C 
JACKSONVILLE 
ti'"OJECT 
tO. SIZE AND TY~ OF 811 
SEE REf'IARY,S 
..._,....eE,.sT~Al7iTioiE'H':M:::O::N=::B:::IJ:::o:::uT.'=s=r.-' • ....:;c.:..:RO.:.:..I x"-':....;vc.:·c.:I_. ___ -t "· DA' u• • .,. ~~~VATIDN ~"o•" '"'" _ .. L, 
H. L.OCATION (C....,MiMaa or Sr•Nn) 
ft1Sl 
X- 1,076,627 
Y = 74,081 
IZ.MANU~ACTUIO&IO'IDI!IIGNATooooo•ooo•~~ 
II. 0101~~·110 AGENCY 
CME 458 
r,m C:TM. 
TNC: 
11.~3~~~ .. "fA3lLil•T"Atct:N ICM''i'jaco 
j UNOtiTu.-•.:o 
._ MOLE NO. (Aa _._ -
......... fftfa 
............... 
: 
CB-VIM-16 
L NAME OP' DRILLE'" 
1'1 nR IHVI'RA 
,._ToTAL Nulla&RcOR& aons 1:Qlastic jar storao 
fl. ELEVATION OIIIOUND WATI:" 
00 Water 
&. DIIIII:CTION OP' MOLl: 
lco...-~•T•o 
11-n1-ll3 
11. DATE HOLC 
~··TICAL. OIMCI.INIEO 
DIK.O. ~ROM ¥& .. T • 
. 
1. THICKNESS OF OVEIIIBU .. DI!N greater than 20 _feet 
1'7. ELEVATION TOP OF HOLE 
]~ .67 ft • 
11. TOTAL COftl: .. I!COY£111Y FOfll: 80"1NG 
85% /J 
~ OI:P'TH DIULLEO INTO ROCK 
000e 
... IIGNATU"I: OF INSPEC:~ _,;?/ 
/ ~ 
_ 
•• TOTAL D&I"TN D~ MOLE 
20 ft. 
UILLERMO ABUDO 
~- VAIMO.V ~ 
• 
79.G7 
- • • Silty fine sand, trace 
!1:!. 
10 
I I 
~ 
= c 
clay, weathered rock 
1 ~ 
35 . 9.2 
a. 
1--= 
(1 
< 
fragments, grayish brown. 
r--:-=-
~ 
= 
l 
' 
(SM) 
% 
10 i 
' 
I 
Vl 
78.17 
2-=_Vv, Fine sandy clayey silt, 
15 " ;1 
1
10
2
. 
30 
13
_
3 
~~~ ~N~ i 
compact, few rock 
/ 
2 
·w 
.. 
= 
fragments, ye 11 owi sh brown. 
1 83% 
-· 18 
it c:: +-'o' 
3-=v' 
(SC) * 
;~ o;::"' 
--
14" I 
12 I 
~ ~ ~~ 
-
~ 
'0:: .~ 
-
;.: 
3 
10.19 
4.5:;;~§2:! 
4-=1/.' 
" 
78% 
9 • 
-g g = 5 
= 
<---- f---·· 
~-
:l • N 
U 
-
• 
15" I 
7 
"' ~ X:;; 
51V 
/ 4 =I 16 
8.3 ~J~~ 
6-=v 
. 
8.3%..,---
7 
~~;:::;-~ 
-
z 
__13._ 
r; ~ .!B 
7.3::._v 
5 
___i 19 
17.3 ~~ ~ 
='' 
10· 
z+->~:.: 
8=--/· 
% 
6 ~~ 45 
-
16: 
9-
• 
9,5._:::: y 
k 
I 
10~=-VV Silt, some clay, to silty ~3~ 
7 
~32
3 
' 
clay, little fine sand, 
~ 
hard, trace weathered 
26 
:. 
11-::/ rock fragments, strong 
~ 
= 
brown to dark brown. 
8 
~ 
28 i 21.1 
-
% 
14 ' 
::~~ 
(CL) • 
4 
9 
::: ~ 
14--._=v 
7;" / 
r--!9-~ 
17.6'! 
10 
~ 
35 
15 : 
1/ 94% 
18 
·-v *Unified soils classifica-
~" 
c=...·-------: 
: 
tion symbol and legend 
!!/.:.''' 
.-!!..-j 
• 
= 
reflect lab test data 
11 
27 
i 51 : 23.9 
16-=v results. 
89% 
~ ' 
17~/ 
;,:, 12 ~ 
48 t 18.< 
181/ 
i 13 
,ll--; 
19 =I / 
~~ 4o 2o., 
59.6] 
l2_Q_ =l/ 
28 
7.6 
70.17 
55 ; 15.71 
I HOLE ~0 
tB-VIM-16 
EHMc .. !~~M 18 36 
PRo:v•ous o:ooToOlls All& oasoLEn. 
PROJEcT E::>TAl E MON BIJOU 
ST. CROIX, U.S.V.!. 
(TRANSLUCENT.) 
PLATE B-28 
I 
Hele Me l,;B-VlM-17 
DIILLIMG LOG 
IDI\Im& 
C::OIITI-1 ATI_ANTIC 
IIITAL.LATIOII 
JIMaaT 1 
JACKC:ONVIILE 
lcw1 
SHan• 
l.""l'liOJICT 
10. IIU MD TY ... OP OIT 
SEE REMARKS 
r<oT~T~ IM\N RT.lOII 
C:T 
CROIX 
V.l 
·D"T"'"""" 
-ISHDWII.,..w-.J 
ar.:;X~~,.;_1:.,o~;;7:,;r:,:~:,;:;;:,:;,-v,_....:..,_'=__;"'~:...:,.;t:..;:7_:6_:Q,_...,_... _____ -I 
II. MAIIUPAc-TUIOOWI D~O!~IION OP DIOILL 
a.oiOtLLt•oa ... c.. 
CME 45-B (Hollow stem auger .drilling) 
F:l'n I'"TM 
TNt'" 
tl. TOTAL NO. Oil' OVRIII· 
1 oeaTuRa&o 
._ MOLIE·NO. (Ae ............. dfler 
~........... 
! CB-VIM-17 
8UIIIDIEN IAM .. LES TAKI'N • l :::1 
i 
UNOtiTUIIIa&O 
I. NAME 011' IMUL.LUI: 
,._TOTAL IIUIIOIEIO COIOI! 00111!1 1-DlastiC .iar Storage 
1'1011 RTVI'RA 
Ia. IELIEVATION OIOOUIID WATIEIO 57 • 22t 1 -?-A":II • .1~., 1 1 _c 
•• DIIIII'CTION OP' HOLE 
••· DATE MOLEI 1• 
1
TART&o 
1 coer..t..k' ao 
o ... P•- van. 
1-01-83 
1 11-01-83 
17. ELIEVATIOII TOI' OP MOLE 
]::J. 4 ]L...!f..!:tc,;•..,.-----~ 
j,. TMICI<NI!SS 01' OVI!IOOUIODI!N areater than 2Q ft, 
II. TOTAL COIOI! IOI!COVI!IOY POlO -IIIO ]4 
-
.. 
• Olli'TM DIOILLIEO IIITO IOOCI< 
not dri 11 ed 
... IIGMATUIOIE OP tiiii'I!CT""_.U /? / 
r-~ 
1-. TOTAL OIEI'TM OP MOLlE 20 ft, 
lr.IITI I !:'DIM\ IIQIInO 
~ 
Y~ 
tJI' ~ 
70.47 
= 
1 Silt, some clay, rock k: 
4 
= 
fragments, trace fine 
-
1-
sand, dark grayish brown. 
1 ~ 
14 
21.8 
= 
(~ll) 
9 
8 
= 
k 
8 
2--= 
2 1--
-:;: 
~ 
= 
~ 
24 
16.7 ~ r:nC. 
3 -
0% 
14 
<= E 
:-~=~~ ~~~~.~+-S-i_l_t_y_s_a_nd-yk-cf_l_a_y-.-v-e-ry---~[%~~~--~~5-~-~~~~ ~ 
=V " stiff, roc 
ragments, 
~ ~ 8 
41~ 
olive brown(sc) * 
[:(
78% 
3 ~- 18 14.7~~;; 
5--=~i) 
1-
"f i~~ 
= 
J 
• 
4 
.!2--
25 
17.0 -g-:;0~ 
-
J 
72% 
13 
10 = 0 
0 
6;-~:~-~~~"r+!-S_i_l_t_y __ 
f_i_n_e_s_a_n_d_,~l-i_t_t-le----~~1nn4"~~~----~2~7~t---t-~-:;:g~ ~ 
7~ ",;tJ ~~~~~ ~~~~n:~i~?n~~iff. 
1/?R~ 
5 ~ 
35 
12.9 ~j~ ~ 
= ,., 
L. 
IL 
6 
10"" ~ ; 
8 
~-:---
>OM.._, 
-
;~J i·" 
ne :>cwu,Lrd<;" , 
i"t, 
6 
11 
1 ...-
1 ., 
=·:--- 1,, 
yellowishbrown. (SM) 
--23 
99""' ........ ~ 
-
~-joi. 
' 
11? 
• 
:ol: 
3 
G7 .47 
64.47 
U2.47 
61.47 
" : ~ l t Weathered rock fragments, IL 
~ 
- ' I some silty fine sand, 
7 
29 
10--= i 
yellowish brown. (Gt-1) * 
,nn.. 
~ 
79 
10.7 
= r ~ 
*Unified Soils Classifica-rz 
43 
11--= j ' 
tion symbol and legend 
t--
34 
-
~ 
reflect lab test data 
8 
63 
9.0 
= , 
resu 1 ts. 
" 
'2'g'-
1~ : 
1.:: 
24 
= 
9 L0/3" 0 
-
/3 11.6 
1~ 
% 
I--
5G.97 
_ 
brown & light gray.(CH) 
68 20.8 
13.::>_/ 
Sllty c1ay,traceT"1ne sand, I),:. 
25 
14--=/ very stiff, light olive 
10 
-36 
1---
% 
32 
ti:i.47 
'" 
=/. • in wet silty clay matrix, 
11 ~ 21.7 
= • )I' Weathered rock fragments, r;!. 
30 
16--= 
/. little/i:)e sand, light olivE 
~ 
54 
!:i
3
.
57 
1~;~ • 
~~~~~~so: clay,trace fine 
l%:% 
14 
':_ 
sand,stiff,olive yellow & 
12 ~ 29.3 
pale brown. (MH) 
"Is 30 
::i 
~' !3 l30 
r 
c;n 47 
: 
~ 19., 
20 : 
100% 
21 
PIIIEVIOUS EDITIOHS ARII OeiOLIITII. 
(TifANSLUCIUIT) 
PLATE B-29 
"RO.IIECT ESTATE ~lON BIJOU 
ST. CROIX, U. S. V. I. 
THOLE NO. 
CB-VIM-17 
Mel• Me CB-VIM -1b 
DIVISION 
IN., ALLA" 011JACKSONV I LLE 
l""UT 1 
D«JLLING LOG 
SOUTH ATLANTIC 
OP' 1 
SHf:ETI 
I. -OJitCT 
10. aiZ& AND TY .. OP etT 
SfF RFIIARKS 
ESTATE MON BIJOU, ST. CROIX, V.I. 
.UAT-~-
--ft,.;;L--.. 
1"- ~AT-f-- ....... 
II. IIAMU~M;' UtiiRWI DRIIOMATIOM Of' -ILL 
I._ ~RIL.L.HIO .wtaNCY 
CME-45B 
GEO CIM 
INC. 
11. TOTAL NO. OP' OYEIII· 
1 DI•TuR•IEo 
1 UNOISTUit •• O 
.. MOLE NO. (Ae ...... • 
....... ffrle 
' CB-VIM-18 
HIIIDilN IAII~LES TAKI:N: 
··,1, 
.., ... ~ 
L NAME OP ORILLD 
, .. TOTAL IIU ... RIO COlOR ~XItl •-plaStlC Jar StOragE 
FLOR RIVERA 
tl- aLIEVATION G"OUMD WATIER 56.73 ft. 
.. OIIIIECTION OP' MOLE 
18TAitTIED 
IC~L..TIED 
... DATE MOL& 
11-01-83 
: 11-01-8_3_ 
IIJV&ItTICAL QtNCLINIED 
D&e. ~ltOM VIEfiT, 
t!:_ THICIUII:II OP OYEIIIaUIIIOEN greater than Z()__!t. 
17. IELEVATION TOll' OP' MOLE 
_64.60 ft. 
Ia. O&"M DRILLED INTO flOCK 
none 
11. TOTAL CORE "I:COVI:IIIY P'OR eoRtNG 
b~ 
/) 
' 
IS. SIGNATUIIIE OP' INI~I:CT~ /7L 1 ~ 
je. TOTAL ORI"TN OF MOLE 
20 ft. 
GUILLERMO ABUDO 
· 
IELEVATION 
OE~TH 
CLAI&IPICATION OP' MATibUAU 
'loCORt: •ox c.. 
(DrUI .... , .. :·::..w.:,.••• ... 
h ol 
LEGEND 
(D__....,,_., 
IIIECOV• SAIIPLE 
ltiOY 
NO. 
IBl ows-r ··-;.· '\!' .... , •• ..., 
ft. . 
~ 
c 
4 
. 
I 
~4.60 
= 
Fine sandy silt, trace clay, 
!.:. 
6 
-
few rock fragments, very 
r--
1-= 
stiff, dark brown. 
1 ~ 
24 
14.3 
: 
. 
. -
(Sf~) 
12 
-
13",/ 
2-= 
,J.Q_ 
= 
..... 
..: 
;;2% 
2 r1L 44 
15.8 "' 
= 
"'"""' 
..... c:~ 
61.60 
:>4 
0 
0. 
3 
c:~ E 
:. 
tr 
little 
1-5" / 
0 
"' 
-
/ Silty fine sand, 
]2__ 
. "' 
.......... 
= 
clay, varying mixed 
i 
"''"" 
<:: 
;.,: 
3 
31 
11.9 .... 
0 
4-
weathered rock fragments, 
/ 
_15 
I 
+'N 0 
= 
I 
.... 
0.0-" 
light olive brown to 
83% 
lfi 
<:: <:: "' 
-
G.IO 
<:: 
olive brown. 
14"/ 
l 
0. 
+>·~ 
5 -
13 
. 
(SC) * 
-o Q...-.j....l 
)-= ' 3/,r 
!... 0 
o.c 
-
4 
10 
18 
tC~V'!aJ 
-
' 
13.8j1~"0 -~ 
I 
6 -,, 
~· J 
78~6 
8 
tC = 0 
0 
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l.j....)OQU 
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;V'IM: 
-
I 
8" 
IE . 
N 
~ 
- v 
/ 
0 
S.. 
X.j....l 
7 -
0 • 
5 
~lfi 
42 
11.7-t~;::~ 
'-= = 
A41c 
2fi_ 
• Q) ;:c -
; 
j 
9 
, :J ...c = "'=' 
11" 
17 
~ ..--
t.:l S-
-
'rc::....:: ......... = 
8-: 1 
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-
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6 
22 
47 
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I 
' 
' 
9-= ' 
6D 
25 
z 
:.;::: 
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13 
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I 
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19 
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= 
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61 
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·------
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20 
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9 
43 
62 
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51.1 
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19 
-
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~ 
14-:: 
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~35.5 
= 
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10 .1.L-i 27 
15-= 
to olive brown,white silt 
15 
' 
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pockets. 
(CH) * 
% 
, 
= 
~ 
18" / 
~ 
-
*Unified Soils Classifica-
16-= 
tion symbol and legend 
11 
11 
23 
33.1 
: 
reflect lab test data 
j,Q.Q% 
~ 
: 
results. 
8" 
13 
17-:: 
/ 
1---
31.3 
: 
~ 
I 
12 
~-· 32 
/ 
-
I 1oo 
16 
18--:: 
: 
4" I 
~ 
-
13 
~28 39.6 
19-: 
/~001 
--
= 
~ 
14o ,;o 
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EM.,G .. !~M 18 36 
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PREVIOUS EDITIONS AlliE 08SOl.I!TI!-
ST. CROIX 
U. S. V . I. B-VIi1-18 
(TRANSLVCVI'T.) 
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P.O. ·sox 447 • HATO REV, ·P.R 00919 
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Date: 
12-21-83 
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PL 
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PI = 16.15 
PI = 30.5 
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Date: 12-2-83 
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PLAN 
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(CL) 
ORGANIC CLAYS OF MEDEUM TO HIGH PLASTICITY 
ORGANIC SOILS (OH) 
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~ 
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FOR BORING LOCATION PLAN, SEE PLATE B- 4. 
.2. FOR DETAILED SOIL DESCRIPTION, SEE BORING LOGS. 
3. FOR 
SECTIONS A-A,B-8 AND C-C ,SEE 
PLATES 
B-SI, B-S2 AND 
B-S3. 
SECTION 205 
DE TAl LED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX B 
PLAN- SOIL PROFILE 
DEPARTMENT OF THE ARMY 
JACKSONVILLE DISTRICT, CORPS OF ENGINEERS 
JACKSONVILLE, FLORIDA 
D.O. FILl; NO.I09-34,414 
PLATE B-50 
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SECTION 205 
DETAILED PROJECT REPORT 
ISO 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX B 
SLOPE STABILITY - LEVEE 
/-1() 
END OF CONSTRUCTION 
·40 
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SECTION A- A 
JACKSONVILLE DISTRICT, CORPS OF ENGINEERS 
JACKSONVILLE, "FLORIDA · 
D.O. FILE NO. 109-34,414 
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SECTION 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX 8 
SLOPE STABILITY- CHANNEL 
END OF CONSTRUCTION 
DEPARTMENT OF THE ARMY 
JACKSONVILLE DISTRICT, CORPS OF ENGINEERS 
JACKSONVILLE', FLORIDA 
D.O. FILE NO. 109·34,414 
PLATE B-52 
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SECTION 205 
DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX B 
SLOPE STABILITY- CHANNEL 
END OF CONSTRUCTION 
DEPARTMENT OF THE ARMY 
JACKSONVILLE DISTRICT,, CORPS OF ENGINEERS.~ 
JACKSONVILLE, FLORIDA 
D.O. FILE NO. 109-34,414 
PLATE B-53· 
SECTION 205 DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX C 
RECREATION ASSESSMENT 
A. 
RECREATION ASSESSMENT 
1. Recreation Assessment. 
a. 
T~e structural features to alleviate flooding, as presented in this 
report, limit recreational opportunity. 
The possibility exists, however, to 
upgrade the existing municipal parks within the project boundaries by using 
suitable material from project construction to re-contour some park areas to 
alleviate site flooding. 
Construction of additional facilities such as a 
restroom, multi-purpose court, playground, etc., with appropriate landscaping 
could also be considered. 
Where opportunities for development of recreational 
facilities do not exist, appropriate treatment of project features would 
include landscape plantings to minimize visual impacts. 
b. 
The opportunity for including these recreation features in the pro-
posed project was coordinated with a letter dated May 9, 1984, to the 
Department of Public Works in St. Thomas. 
No interest in recreation deve-
lopment has been expressed; therefore, recreation planning has been 
suspended. 
C-1 
SECTION 205 DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX D 
ENGINEERING, DESIGN, AND COST ESTIMATES 
SECTION 205 DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX. U.S. VIRGIN ISLANDS 
APPENDIX D 
ENGINEERING. DESIGN. AND COST ESTIMATES 
A. 
INTRODUCTION 
B. 
DESIGN AND CONSTRUCTION 
Channel 
Levee 
Gabion Control Structure 
C. 
REAL, ESTATE REQUIREMENTS 
D. 
RELOCATIONS 
General 
Bridges 
Houses 
Utilities 
E. 
OPERATION AND MAINTENANCE 
F. 
CONSTRUCTION SCHEDULE 
TABLE OF CONTENTS 
G. 
QUANTITIES AND COST ESTIMATES 
LIST OF TABLES 
D-1 
Estate Mon Bijou Contract Price - Quantities 
and Cost Estimates 
D-i 
PAGE NO. 
D-1 
D-1 
D-1 
D-1 
D-1 
D-2 
D-2 
D-2 
D-2 
D-2 
D-2 
D-2 
D-2 
D-2 
PAGE NO. 
D-3 
APPENDIX D 
ENGINEERING, DESIGN, AND COST ESTIMATES 
A. 
INTRODUCTION 
1. General. 
This appendix presents the discussion of applicable design 
considerations and construction methods utilized to establish a basis .for 
the cost estimates. The proposed plan is presented .in the main report and 
Appendix A - "HYDROLOGY - HYDRAULICS". 
General requirements for real estate 
and operation and maintenance are also presented. 
• 
B. 
DESIGN AND CONSTRUCTION 
2. Channel. 
Approximately 6,500 feet of channel would be constructed 
along the alinement shown on plate 2 in the main report. The channel would 
be excavated to satisfy the hydraulic design data shown in Table A-5. 
A 
portion of the excavated material would be used to construct the proposed 
levee, and the excess would be hauled to an off-site disposal area or 
possibly placed alongside the channel. 
3. Levee. 
A levee, approximately 450 feet in length would be 
constructed along the upstream portion of the proposed project to provide an 
SPF level of protection. The crown would be 15 feet wide and vary in eleva-
tion from 190 feet (msl) at the westerly end to about 175 feet (msl) at the 
intersection with Highway 73. 
Side slopes would be lV on 2.5H. 
A gabion 
mattress would be placed along the north face of the levee to provide ero-
sion protection. The levee alinement is shown on plate 2 in the main 
report, and a profile is shown on plate A-5. 
4. 
Gabion Control Structures. Thirty-three gabion control structures 
would be constructed at various intervals along channel alinement to main-
tain subcritical velocities and prevent erosion. A plan and section of the 
proposed gabion control structure is provided on plate 3 in the main report. 
The geotechnical requirements for construction of the structures are pre-
sented in Appendix B - "GEOTECHNICAL AND MATERIALS". 
5. 
Inflow Modifications. The two major inflow points at Station 23+00 and 
Station 57+00 along the proposed channel would be modified to provide erosion 
protection. A description of these modifications is provided in Appendix A. 
The gabion bank protection would extend to one-foot above the inflow design 
water surface. 
C. 
REAL ESTATE REQUIREMENTS 
6. Real Estate Requirements. 
The local sponsor would be required to assume 
the cost of all land, easements, and rights-of-way, including disposal 
areas, required for construction maintenance of the project. 
D-1 
D. 
RELOCATIONS 
7. General. 
The local sponsor would be required to assume the costs 
for relocations and alterations. These would include highway bridges, 
streets, houses, buildings, electric transmission lines, util.ities, fences, 
and other miscellaneous items. 
8. Bridges. The proposed project would require the construction of two 
bridges as shown on plate 2 in the main report. For cost estimating 
purposes, the bridge slabs would be poured-in-place beam and slab reinforced 
concrete construction. The bridge at Station 20+60 would be approximately 
140 feet in length and provide for two 10-foot lanes. The bridge at Station 
60+60 on Canaan Road-would be approximately 150 feet in length and provide 
for two 12-foot lanes with 3-foot-wide sidewalks. 
Prior to construction of 
this bridge, a detour road would have to be constructed to maintain the flow 
of traffic. Detours to be used during construction of the other bridge 
would utilize existing roadways. 
9. Houses. 
At least three houses located along the eastern end of the 
proposed channel alinement would be relocated. 
10. Utilities. Topographic surveys would be obtained prior to preparation 
of contract plans and specifications in order to locate any underground uti-
lities, above ground telephone lines, and/or electric transmission lines 
which would require relocation or alteration in order to construct the 
improvements presented in this report. Twenty-five thousand dollars has 
been included in the estimated relocation costs for unknown utilities. 
E. 
OPERATION AND MAINTENANCE 
11. oeeration and Maintenance. 
The local sponsor would be responsible for 
the ma1ntenance of the improvements proposed in this report upon completion 
of the construction contract. The Contractor would be responsible for all 
maintenance during the construction contract. 
F. 
CONSTRUCTION SCHEDULE 
12. Construction Schedule. 
Following approval of this report and 
appropriation of funds, contract plans and specifications would be prepared 
for the proposed plan presented herein. It is anticipated that a construc-
tion start would be scheduled for Fiscal Year 1988 or 1989. 
The estimated 
construction time would be 12 months. 
G. 
QUANTITIES AND COST ESTIMATES 
13. Cost Estimates Presented. Quantities and cost estimates for construc-
tion of the proposed plan are presented in table D-1. 
D-2 
• 
TABLE D-1 
ESTATE MON BIJOU - ST. CROIX, VIRGIN ISLANDS 
QUANTITIES AND COST ESTIMATES 
(Date of Estimate: 
July 1987) 
Cost 
Account 
Number 
Item 
Unit 
Quantity 
09 
11 
30 
31 
CONSTRUCTION COST 
Mobilization/Demobilization 
Excavation 
Levee Construction 
Clearing and Grubbing 
Grassing 
Gabion Control Structures 
Inlet Modifications 
Building Removal 
Subtotal 
Contingencies (20%+) 
Contract Price 
-
Engineering and Design 
Supervision and Administration 
CONSTRUCTION COST 
Job 
C.Y. 
C.Y. 
Acre 
Acre 
C.Y. 
Job 
Job 
1 
285,000 
1,500 
25 
10 
8,500 
1 
3 
LANDS AND RELOCATIONS 
01 
Lands and Damages 
Rights-of-Way and Easements 
Residential Acquisition 
PL 91-646 
Administrative Costs (10%+) 
Subtota 1 
Contingencies (15%+) 
Lands and Damages -
02 
Relocations 
Bridges 
Utilities 
Subtotal 
Contingencies (20%+) 
Relocations 
-
LANDS AND RELOCATIONS 
TOTAL FIRST COST 
Interest During Construction @ 8 5/8% - 12 months 
TOTAL INVESTMENT COST 
ANNUAL COST 
Interest and Amortization @ 8 5/8 - 50 years 
Maintenance 
ANNUAL COST 
D-3 
• Unit 
Price 
L.S. 
2.50 
1.25 
$1500.00 
$1500.00 
$ 90.00 
L.S. 
$2000.00 
Total 
$ 
20,000 
712,500 
1,875 
37,500 
15,000 
765,000 
63,500 
6,000 
$1,621,375 
324,27 5 
$1,945,650 
194,550 
155,600 
$2,295,800 
$ 307,500 
150,000 
31,500 
47,500 
$ 536,500 
80,500 
$ 617,000 
$ 605,000 
25,000 
$ 630,000 
125,000 
755,000 
$1,372,000 
$3,667,800 
150,000 
$3,817,800 
$ 334,600 
3,400 
$ 338,000 
SECTION 205 DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX E 
ECONOMIC ANALYSIS 
• 
SECTION 205 DETAILED PROJECT REPORT 
ESTATE MON BIJOO 
A. 
ECONOMIC SECTION 
Introduction 
General Background 
ST. CROIX, U.s. VIRGIN ISLANDS 
APPENDIX E 
ECONOMIC ANALYSIS 
TABLE OF CONTENTS 
Existing Without Project Flood Damages 
Future Without Project Flood Damages 
With Project Damages 
Summary of Average Annual Benefits 
LIST OF TABLES 
E-1 
Population & Projections - U.S. Virgin Islands 
E-2 
Employment by Industrial Group for Virgin 
Islands Territories 1982 
E-3 
Summary of Without Project Damages 
E-4 
Summary of Without and With Project 
(Bypass Plan) Damages 
E-5 
Estimated Number and Value of Structures and 
Land to be Purchased 
E-6 
Summary of Without and With Project Damages 
E-7 
Summary of Average Annual Equivalent Benefits 
E-i 
PAGE NO. 
E-1 
E-1 
E-4 
E-6 
E-6 
E-8 
PAGE NO. 
E-3 
E-4 
E-5 
E-6 
E-7 
E-8 
E-8 
A. 
ECONOMIC SECTION 
1. 
Introduction. 
The purpose of this section is to evaluate the effects of 
the modifications which are proposed to be made to the drainage conditions 
presently existing in the study area. 
a. The economic aspects of the study were to: 
(1) specifically determine the extent and location of present land 
use and resource development in the area, 
(2) 
suggest a pattern for future land utilization in the area, 
(3) 
analyze the effects on the economic activity in the area caused 
by the proposed modifications to the existing drainage conditions, and, 
(4) 
compare the economic trade-offs between the alternative plans 
proposed. 
b. 
The general assumptions in this study are limited to the following: 
(1) 
during the study period, there will be no major economic 
recessions which will seriously affect the long term growth pattern of the 
national economy, and, 
(2) 
the international political tensions will remain at approximately 
the present level and there will be no widespread outbreak or hostilities. 
2. 
General Backlround. 
The study area is located on the Island of 
St. Croix whichs a part of the U.S. Virgin Islands Territories. This 
territory is made up of three inhabited islands. 
Although under one govern-
ment, each island has it owns distinct characteristics. The territories' 
history has been guided largely by events controlled by outside forces. 
Originally discovered by Columbus, its most important early developments 
were provided by Denmark. 
The United States gained control of the islands 
in 1917. 
Original commercial interest was centered in agricultural produc-
tion, i.e., sugarcane, and as a transcontinental shipping station. These 
activities declined in importance in the latter part of the 1800's and the 
early part of the 1900's with a devastating effect upon the economy of the 
islands. 
Between 1835 and 1930 the population decreased by one half. 
The 
construction of naval facilities on the islands and a resurgance of sugar-
cane activity due to the repeal of Prohibition in the United States resulted 
in a 20 percent increase in the population between 1930 and 1950. 
a. 
Economic activit¥ remained depressed through the 1950's; however, 
during this period the sugarcane industry was being replaced by a diver-
sification of productive activity through expanding tourism and manufac-
turing exports. 
The most dramatic growth in every sector of the economy 
took place during the 1960 to 1970 period. The population grew from about 
E-1 
32,000 persons in 1960 to about 92,000 in 1'975. 
Historical population and 
population projections are shown in table 1. Gross territorial product grew 
at 10 percent per year as the tourist, manufacturing, construction, and 
government sectors of the economy expanded. 
Tourism, the most dominant eco-
nomic activity, increased from about 200,000 visitors per year to well over 
1,000,000 visitors per year. 
The employed labor force tripled during this 
period and the Virgin Islands Gover~t budget rose from 7.1 million 
dollars a year to 114.1 million doll~~~ per year. 
The distribution of 
employment in the territory is shown~ Table 2. 
Personal income for 1980 
reached $622.7 million. 
By 1982, it had climbed to $705.5 million. 
Per 
capita income was $7,078 in 1982. 
The territorial economy is heavily 
tourist oriented. 
Much of the employment and income in the transportation, 
wholesale and retail trade, hotel, and services sections is derived from the 
tourist demands. 
In 1982, the number of visitors by air to the islands was 
395,420 and by cruise ship was 464,593. 
There are other industries. The 
Hess Oil Company, a petrochemical refinery and The Martin Marietta Bauxite 
Plant are located on St. Croix. 
There are 44 industries on St. Thomas -
Johns Islands. 
As stated earlier, this expansion was the result of exoge-
nous forces providing the drive for the insular expansion. 
Included in 
these external changes were the discovery of the islands as a tourist 
attraction, large federal subsidies, United States Territorial trade con-
cessions, and legislative privileges, and an influx of off-island capital. 
As with all island economies dependent upon main land prosperity, fluctu-
ation in the external econony cause similar results in the insular activity. 
This was true of the 1970's downturn in the United States economy and the 
high inflation and interest rates on the main land. 
b. 
This extensive growth in population and economic activity resulted 
in dramatic changes in the residential development pattern in the territory. 
Past low-density rural residential patterns have been altered to provide the 
land area necessary to accommodate this large population growth on islands 
with limited land resources. 
The average number of persons per square mile 
was 250 in 1960. 
In the late 1970's this had increased to 725 persons per 
square mile. 
This expansion pressure and change in residential patterns has 
been especially true for the island of St. Croix. 
The intensive demand for 
resources devoted to the tourist segment of the economy has made loca 1 city 
residential dwelling very expensive. 
The lack of infrastructural shopping 
catering to permanent resident needs has also made city dwelling incon-
venient. These factors coupled with other social changes has resulted in 
large expanses of suburban sprawl. 
The mobility provided by the automobile 
has made suburban residency and center city employment compatible and vast 
tracts of agricultural lands and open country have been displaced by urban 
developments. 
c. The Estate Mon Bijou and Glynn are examples of the suburban develop-
ments resulting from these very recent and dramatic changes in the 
·demographic, economic, and social changes which have taken place on the 
island. Residents in these two communities commute to the hotels, marinas, 
industries, and center city commercial locations of their employment. 
E-2 
• 
1975 
1985 
St. Thomas 
Totals 
75,15 
1990 
e 
TABLE E-1 
POPULATION & PROJECTIONS 
U.S. VIRGIN ISLANDS 
1995 
2000 
2005 
e 
2010 
2015 
2020 
2025 
2030 
2035 
172,568 
~ * U.S. Virgin Islands growth statistics, Office of Policy, Planning & Research, U.S. Virgin Islands Department of Commerce. 
I 
~ 
TABLE E-2 
EMPLOYMENT BY INDUSTRIAL GROUP FOR 
VIRGIN ISLANDS TERRITORIES 1982 
Industrial Group 
Number Persons 
Percent Total 
Agriculture 
3, 777 
9.4 
Manufacturing 
2,700 
6.7 
• 
Construction & Mining 
3,270 
8.2 
Transportation and 
Public Works 
2,180 
5.4 
Wholesale and Retail Trade 
7,210 
18.0 
Finance, Insurance, 
and Rea 1 Estate 
1,530 
3.8 
Hotel, Etc. 
2,700 
6.7 
Other Services 
3,240 
8.1 
Government 
13,500 
33.7 
Tota 1 s 
40,107 
100.0 
Individual home ownership is typical of these areas. 
Portions of both 
Estate Mon Bijou and Glynn are subject to periodic flooding and the segment 
of these developments subject to this flooding is the portion being examined 
in this study. 
3. 
Existing Without Project Flood Damages. 
The study area is composed of 
two residential subdivisions called Estate Mon Bijou and Glynn. 
They are 
urban in nature, but are surrounded by a rural environment. 
The homes are 
privately owned and lived in by permanent residences of the island of 
St. Croix. 
These subdivisions are situated in the North Central portion of 
the island of St. Croix in the upstream sector of the Salt River watershed 
approximately 5 miles West of Christiansted. Estate Mon B~· u is located 
upstream of Glynn at the confluence of the Canaan Gut and 
e Little 
\ 
\ 
\ 
E-4 
e 
' 
Fountain Gut. 
The physical characteristics of the area are represented by 
steep topography, thin clayey soils with nonporous rock bases and numerous 
short drainage basins. Flooding is of short duration with high velocities. 
a. There are over 200 individual residential units in the area which 
have experienced severe flooding and extensive property losses. Their 
construction ranges from poor frame to good masonry. 
Many are built at 
ground level. They range in size from 500 to 3,000 square feet. 
All 
housing units in the Estate Mon Bijou and Glynn are not affected by 
flooding; however, the majority of units in Estate Mon Bijou would be inun-
dated during an SPF condition. 
b. 
Maps were prepared for the study area showing the type of existing 
land use, its location, and an estimate of the value of the land use acti-
vity at each location. Flooded area maps were also prepared of the area for 
the 2, 5, 10, 25, 50, 100 and SPF without project storm frequencies. These 
flooded area maps describe the stages and frequencies of each of these 
floods. 
The information used in calculating the flood damages caused by 
each of these storms is obtained by interfacing the data on the land use 
maps and the flood frequency maps. 
The damages occurring to existing land 
use (1985) for each of these flood frequencies is shown in the following 
tabulation. 
TABLE E-3 
SUMMARY OF WITHOUT PROJECT DAMAGES 
~) 
(Existing Land Use) 
0! 
1986 Price Levels 
\ 
nAMA :J:".S 
''Fl,.OOD 
WITHOUT PROJECT CONDITIONS 
FREQUENCY 
MUN IHJUU 
GLYNN 
I UrAL 
"""-
) 
2 
[639 990 
4,100 
344,090 
~,_ 
5 
629,790 
36,230 
666,020 
10 
823,100 
74,340 
897,440 
25 
1,108,060 125,580 1,233,640 
50 
1,318,280 199,400 1,517,680 
100 
1,504,230 293,370 1,797,600 
SPF 
2,357,460 931,880 3,289,340 
AVERAGE 
ANNUAL 
413,380 
28 '770 
442,150 
I 
E-5 
4. 
Future Without Project Flood Damages. 
That portion of the Estate Mon 
Bijou Subdivision subject to flooding is very densely developed .and there is 
expected to be no change in the future utilization of the land in this area. 
The Glynn Subdivision is less thickly settled; however, most of the home 
sites have been developed in the area and it is concluded that little future 
change will take place in the area under without project conditions. 
Therefore, existing and future flood damages will be identical. 
5. 
With Project Damages. 
Five proposals have been examined as solutions to 
the flood1ng problems in this area. 
They consist of the concrete bypass 
plan, the gabion bypass plan, the earthen bypass with drop structure plan, 
the non-structural relocation plan and the selected plan. 
The first three 
plans are bypass channels around the residential area and provide exactly 
the same flood protection. The non-structural relocation plan consists of 
purchasing all structures within the 5-year, the 10-year and the 25-year 
flood plains and relocating those residences elsewhere. 
The selected plan 
consists of a partial channel improvement of the existing channel. 
The 
benefits derived from each of these proposals are discussed below. 
a. 
With Project Damages for the Bypass Plans. 
Flooded area maps were 
prepared of the area for the 25, SO, lOO and SPF frequency storms with pro-
ject hydrologic conditions. These maps were interfaced with existing land 
use maps to obtain the depth of flooding in the residential structures. 
The 
structure and content damage was estimated using depth damage curves deve-
loped for the area. 
Additional damage was calculated for autos, lawns and 
shrubs, roadways and culverts. 
The results of the analysis are shown in the 
following tabulation. 
(' 
··, f .--' 
TABLE E-4 
:':A,,) 
SUMMARY OF WITHOUT AND WITH PROJECT (BYPASS PLAN) DAMAGES 
(Existing Land Use) 
1986 Price Levels 
DAMA!iES 
DAMAGES 
W/0 
WITH 
FLOOD 
PROJECT 
PROJECT 
DAMAGES 
FREQUENCY 
CONDITIONS 
CONDITIONS 
PREVENTED 
$ 
$ 
$ 
2 
344,090 
0 
344,090 
. 
5 
666,020 
0 
666,020 
10 
897,440 
0 
897,440 
. 
25 
1,233,640 
242,550 
991,090 
50 
1,517,680 
431,970 
1,085, 710 
100 
1,797,600 
568,470 
1,229,130 
SPF 
3,289,340 
921,480 
2,367,860 
AVERAGE 
ANNUAL 
I 
442,150 
26 560 
415 600 
E-6 
No future change is anticipated in the land use as a result of providing 
these plans. 
Both existing and future damages are the same. 
The average 
annual equiv~lent benefits·derived from these three bypass plans are 
$396,000. 
b. 
Non-Structural Relocation Plan. 
The number of structures required 
to be purchased in each of the three flood plains is shown in the following 
tabulation. 
TABLE E-5 
ESTIMATED NUMBER AND VALUE OF STRUCTURES AND LAND TO BE PURCHASED 
(Existing Land Use) 
1986 Price Levels 
ESTIMATED 
ESTIMATED 
FLOOD 
NO. OF 
AVERAGE 
TOTAL 
FREQUENCY 
STRUCTURES 
VALUE 
COST 
58~400 
$ 
2 
29 
2 
41,500 
2,579,180 
5 
35 
58,400 
5 
41',500 
3,270,500 
10 
41 
58,400 
6 
41,500 
4,027,890 
25 
51 
58,400 
13 
41,500 
5,114,080 
Flooded area maps were prepared for the areas outside these flood plains 
and flooding to the remaining structures and contents determined. 
The 
average annual damages which would occur to these remaining residences were 
then computed. 
Benefits of the Nonstructural Plans. 
The nonstructural plans being exa-
mined consists of purchasing those residential properties located within the 
5, 10, and 25-year without project flood plains and relocating the resi-
dences elsewhere. 
Because only that portion of flood losses prevented which 
are externalized may be claimed as benefits, the average annual damage was 
computed separately for those structures within the without project flood 
lines. Those properties falling outside the without project flood line 
remain subject to inundation damages from flood frequencies greater than the 
2, 5, 10, and 25-year frequency floods and those average annual damages have 
been computed and are noted as residual damages. 
E-7 
r 
The benefits claimed are computed as the damages to those properties 
proposed to be removed. 
Only externalized flood damages are eligible to be 
claimed as benefits. The externalized flood damages are equal to the total 
flood damages less the cost of the flood insurance premiums paid by the 
owner of the insured structure located in the flood plain. 
ER 1105-2-353 
stipulates that flood insurance premiums are a cost borne by the flood plain 
activity under without project conditions and must be deducted from the 
without project damages. 
The flood insurance premium for each activity was 
computed using the rates and methods specified in the Flood Insurance Manual 
(NFIP-10/83). 
The total premium for structure and contents was assumed to 
be an average annual equivalent since it would be an annual payment. 
The deductible portion of flood damages is also assumed to be a cost 
borne by the flood plain activity, and is therefore subtracted from the 
damages prevented. 
The $200 deductible for structure and for content dama-
ges ($400 total) from each occurrence was converted to an average annual 
equivalent by application of expected frequency of flooding based upon the 
elevation of the structure. 
The overhead associated with administration of the Flood Insurance 
Program for structures to be removed is $85.00 per policy as prescribed in 
EC 1104-2-167 for 1987. 
Because this overhead represents a cost borne by 
the nation, the reduction of the overhead associated with the relocation of 
flood plain activities is an NED benefit of the project. The estimated 
overhead and administration cost associated with the subject properties was 
added to the damages prevented (less flood insurance premiums and deduc-
tibles) in order to arrive at the benefit to relocation of the subject flood 
plain activities. 
The average annual equivalent benefits available from each of these 
three nonstructural plans is shown in the following tabulation (Table E-6). 
E-8 
Plan 
2 Year 
5 Year 
10 Year 
25 Year 
TABLE E-6 
BENEFITS FROM NONSTRUCTURAL PLANS 
($1,000) 
Ave Ann Eqvn 
t-looa 
Damages w/o 
Insurance 
Project 
Premiums 
Deductibles 
262.6 
8.9 
6.2 
358.0 
11.3 
7.3 
372.3 
13.2 
9.4 
384.4 
17.6 
12.8 
uverneaa 
and 
Admin 
Benefits 
2.6 
250.1 
3.4 
342.8 
3.9 
353.6 
5.4 
359.4 
c. Selected Plan. 
Flooded area maps were prepared for the 2-year, 
5-year, lO-year, 25-year, 50-year, 100-year, and SPF flood with project 
storm events. These maps were interfaced with the existing land use maps to 
obtain the depth of flooding in the residential structures. The structure 
and content damage was estimated using depth-damage curves developed for the 
area. Additional damage was calculated for autos, lawns and shrubs, road-
ways and culverts. The results of these calculations are shown in the 
tabulation on table E-4. These reflect the elimination of most of the 
flooding in the Mon Bijou and Glynn areas due to the diversion of water 
around the developed portions. 
E-9 
• 
SECTION 205 DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX F 
CULTURAL RESOURCES 
• 
SECTION 205 DETAILED PROJECT REPORT 
EsTATE MON BIJOO 
ST. CROIX~ U.s. VIRGIN ISLANDS 
APPENDIX F 
CULTURAL RESOURCES 
TABLE OF CONTENTS 
~ACKGROUND 
SURVEY 
RESULTS 
CONCLUSIONS 
1. 
2. 
3a. 
3b. 
3c. 
3d. 
3e. 
3f. 
3g. 
4 . 
LIST OF FIGURES 
Known Cultural Resources 
Location of Proposed Project 
Survey Sections 
Suvery Sections 
Survey Sections 
Survey Sections 
Survey Sections 
Survey Sections 
Survey Sections 
Lebanon Dam Site 
F-i 
PAGE NO. 
F-1 
F-1 
F-2 
F-2 
APPENDIX F 
CULTURAL RESOURCES 
1. A cultural resources survey was conducted of the Mon Bijou Flood Control 
Project area for the u.s. Army Corps of Engineers, Jacksonville District 
(Cultural Resources Survey: 
Mon Bijou Flood Control Pro·ect, St. Croix, 
V.I._ 1 8 • 
1s survey was es1gne 
to 
1 ent1 y escr1 e any s1tes in 
the ~roject area, (2) evaluate the significance of any located sites and 
assess their eligibility for nomination to the National Register of Historic 
Places (NRHP), and (3) prepare mitigation plans for any NRHP sites. Work 
was accomplished in compliance with the National Historic Preservation Act 
of 1966, as amended (PL 89-665); the Archeological and Historic Preservation 
•Act, as amended (PL 93-291); and Executive Order 11593. 
The report was 
coordinated with the State Historic _ Preservation Officer (SHPO) and the 
National Park Service. 
Background. 
2. The proposed Mon Bijou Flood Control Project crosscuts a portion of the 
Upper Salt River Archaeological District, which is included on the National 
Register of Historic Places (NRHP). 
Four prehistoric (Saladoid) sites are 
located within this district (Glynn 1 and Glynn 2, and Windsor 1 and Windsor 
2). Three other sites have been identified in the area (Concordia 2, 
Concordia 3, and Windsor 4), and another- the Lebanon Dam Site- was dis-
covered during the survey conducted for this project (see figure 1). 
Survey. 
3. Fieldwork was conducted from 24 September through 16 October 1983, and 
focused on a corridor defined as approximately 61 meters wide by 2,016 
meters long. This corridor was identified by establishing a centerline for 
the proposed bypass channel and extending approximately 30.5 meters on 
either side (see figure 2). 
4. Field investigations entailed both surface examination and subsurface 
testing. Transects divided the area into approximately 30m x 30m sections. 
These transects were marked, and a 1-meter wide path on each side was visu-
ally inspected. This surface study was subsequently supplemented by test 
units, again placed at 30-meter intervals. Sixty-eight (68) such units were 
dug. 
The depth of each was determined by the presence of hard clay or rock, 
and the majority reached 50-60 ems (see figures 3a-3g). 
5. 
In addition to this systematic pattern of coverage. a reconnaissance was 
made of significant sitesbordering the proposed channel. 
The purpose of 
this additional investigation was to establish the boundaries of Glynn 1 and 
the Lebanon Dam Site to see if they extended into the project corridor. 
F-1 
Results. 
6. 
No significant cultural resources were identified in the proposed 
project area. Testing of Glynn 1 and the Lebanon Dam Site suggested that 
materials found inside the project area were secondary or tertiary deposits 
resulting from slopewash. 
• 
7. 
One potential site was identified. A depression located west of the 
Estate Lebanon stock pond may be a prehistoric or historic well. Stones 
filling the area precluded investigations to determine its origin. 
Conclusions. 
8. The survey concluded that no known significant sites will be adversely 
affected by construction of the Mon Bijou Flood Control Project. 
None were 
identified within the corridor itself, and, since neither the water level 
nor the velocity will be increased by the proposed project, no adverse 
effects to downstream sites is anticipated. 
9. However, given the proximity of Glynn 1 and the Lebanon Dam Site to the 
project area (see figure 4), and because the channel passes through a 
National Register District, an archeological monitor will be present during 
construction to ensure that no significant sites are adversely affected. 
In 
addition, the construction contractor will remove the stones blocking the 
depression area, and an archeologist will determine if it represents a 
significant cultural resource. 
If any sites are identified that will be 
impacted by the project and that are eligible for nomination to the NRHP, 
mitigation will be accomplished. 
F-2 
e 
' 
I 
Cllllatonc ruma 
& other archaeo-
logical lilel .. 
• 
FBi.m 
f3 e:. 
~II 
r 
DNRHP 
diatricl 
e 
Figure 1 
Known cultural resources in the region of the proposed project. 
e 
·, 
e 
I 
contour interval: 40 m 
---supplemental 
contours: 20 m 
It 
0 
1000 
om 
500 
(Base: DCCA 1976) 
Figure 2 
Approximate location of the proposed project centerline, with numbered turning points. 
e 
e 
\ 
\ \ 
\ ', 
I \ 
• . 
I 
--
~-:......_ 
- -- \ 
I 
n/ 
PJ· I-
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r --. ··---..,.. .. 
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... 
0 
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.... ... ... 
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Figure 3b 
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. 
I 
----
~--
,· 
Survey sections and test locations in the project corridor: 
parcel 246 access road to Glynn subdivision. 
I 
I 
\ ', ) 
e 
.• ,. 
Figure 3c 
e 
• 
Survey sections and test locations in the project corridor: Glynn subdivision, 
and addi Lional diversion channel. 
' 
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.... ... 
ca 
t.l 
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Figure 3e 
Survey sections and test locations in. the project corridor: Point 4 to stake 48. 
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. Figure 3f 
Survey sections and test locations ln the project corridor: stake 46 to western Estate 
Lebanon Ill 1 1 acce1:1a road. 
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project 
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SECTION 205 DETAILED PROJECT REPORT 
ESTATE MON BIJOU 
ST. CROIX, U.S. VIRGIN ISLANDS 
APPENDIX G 
LOCAL COOPERATION AND PUBLIC INVOLVEMENT 
APPENDIX G 
LOCAL COOPERATION AND PUBLIC INVOLVEMENT 
This appendix contains the Letter of Intent and acknowledgement of the 
draft Local Cooperation Agreement (LCA) prepared in conjunction with the 
project's local sponsor, the Public Works Department of the Government of 
the U.S. Virgin Islands. Also included within this appendix are comments 
received from those who have reviewed the draft report. These comments and 
those received during a public workshop on St. Croix at the John H. Woodson 
Junior High School on June 30, 1987, have been incorporated into this final 
report. Local press coverage of the workshop is also included. 
G-1 
DIVISION 
.e 
IN REPLY ADDRESS 
COMMISSIONER OF PUBLIC WORKS 
GOVERNMENT OF 
THE VIRGIN ISLANDS OF THE UNITED STATES 
CHARLOTTE AMALIE, ST. THOMAS, V.I. 
P.O.BOX 4400 
PUBLIC WORKS DEPARTMENT 
Office of the Commissioner 
November 16, 1987 
Colonel Robert L. Herndon 
District Engineer 
U.S. Army Corps of Engineers 
P. 0. Box 4970 
Jacksonville, FL 
32232-0019 
Dear Colonel Herndon: 
We are reviewing the draft Local Cooperation Agreement 
(LCA) as proposed for the Estate Mon Bijou/Glynn Area 
of St. Croix. 
Refer ........................ . 
As the local sponsor of the proposed flood damage reduc-
tion measure on St. Croix, we intend to fulfill our 
obligation as ultimately negotiated in the completed LCA. 
Sincerely, 
Projects 
GSS/alg 
• 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 
REGION II 
OCT 1 B 1984 
Mr. A. J. Salem 
Chief, Planning Division 
Department of the Arrl!i 
26 FEDERAL PLAZA 
NEW YORK NEW YORK 10278 
JaCksonville District, Corps of Engineers 
P.O. Box 4970 
Jacksonville, Florida 32232 
Dear Mr. salem: 
we have reviewed the feasibility study notice regarding the proposed flood 
control channel located at Estate Mon Bijou, St. Croix, u.s. Virgin Islands. 
Based upon the brief project description and map provided, it is difficult to 
determine if the proposed channel modifications will i.rtpact wetland areas. If 
wetland areas are impacted by the proposed project, please be advised that 404 
(b)(1) Guidelines will apply and further coordination between our respective 
agencies will be necessary. 
If you have any questions relating to the above comment, please contact 
Mr. Christopher Militscher of my staff at (212) 264-0522. 
Thank you very much for the opportunity to comment. 
Sincerely yours, 
~Md 
M. WJJ---, -
Richard M. Walka, Chief 
Environmental Impacts Branch 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 
REGION II 
26 FEDERAL PLAZA 
NEW YORK. NEW YORK 10278 
AUG 1 3 1987 
Mr. A.J. Salem 
Chief, Pla.nning Division 
Department of the Army 
Jacksooville District, Corps of Engineers 
P.O. Box 4970 
Jacksonville, FL 
32232-0019 
Dear Mr. Salem: 
The Environmental Protection Agency (EPA) has reviewed the draft definite 
project report and environmental assessment for the proposed flood control 
channel located at Estate Mon Bijou, St. Croix, Virgin Islands. Based on our 
review, we offer the following comments: 
The environmental assessment states that valuable mangrove and salt pond wet-
lands located in the Salt River Bay will not be adversely affected by the 
project. Detailed information to support this conclusion should be provided. 
In addition, consideration should be given to our comments of July 21, 1982, 
concerning the clearing of lower channels leading into Salt River Bay as an 
addition to the proposed plan. 
Appropriate measure should be employed during the construction and operation 
of the flood control channel to ensure that the vegetation that controls soil 
retention is not destroyed. 
In addition, care should be taken to ensure that 
the pre-historic sites at Glynn I and Lebanon Dam are not disturbed. 
Thank you for the opportunity to comment. 
If you should have any questions, 
please contact Ms. Vicki J. Snitzler of my staff at (212) 264-6677. 
snrely yours, 
.1 
~~ 
'1\ {; !Lwf'"'"-
Robert W. Ha.rg_""'ve, Chief 
Federal Activities Section 
Environmental Impacts Branch 
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United Slates Department of the tterior 
fiSH AND WILDLIFE SERVICI 
1 
D1v1s1on of Ecolog1cel Services 
. MQaguez, Pu.rto Rt co 00701 
Mr. A. -J. 
Sale~~ 
Act1nl Chief. Planning Otvis1on 
u.s. nqy·Corps of Engineers 
P.O. Box 4970 
Jecksonvtlle. Florida 32232 
June 28, 1982 • 
Re: 
Estate Mon ltjou 
St. Croix, Virgin Jslandl 
Dear Str: 
This constitutes a Planning A1d latter-for the above referenced project. 
Tb11 is prov1dt4 1n accordance with the Fish and Wildlife Coordtnatton 
Act (48 Stat. 401, as amended; 1a u.s.c. 661 et seq.). 
• 
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. 
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' 
This letter is based on a review of the pre11•1n•ry reconn.issance repol"t 
including alternatives and a field review of .the area conducted on June 17, 
1182. 
.. 
Oessrtpt1on of tbe Project Aree 
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Estate Mon Bijou is locatecl tn the north-central .-.rt of St. Croix aftcl 1t 
·· . located about 5 miles west of Christiansted. The area experiences severe 
flooding due to steep slopes that can create flash floods during periods 
·of heavy rain. The fact that severe flooding occurs is evident tn thlt 
several homes in Estate Mon t1jou have been abandoned due to the flOoding 
1 cond1t1ons preient w1thfn the drainage. 
The upper portions of the MDn 11~ou/61ynn watershed is characterized br a 
111xtvre of upland vegetation and open pasture areas. The 110st pro~~1nent 
structure wtthin the watershed ts the housing development. 
Vegetation in 
the upper portion is 1110stly grasses and s01n1 large trees such as fllllboyan 
(O.lonix ~,ta), thorn scrub (Acacia), gulllbo-t111bo (Bursera siMrubt), 
Mngo (Rang 3ra indica) and taMrindo (~indus indica). thire are no 
•tlands in 
e upper portion of the drainage·. 
The most significant ecolog1ca1 area w1thtn the entire drainage is Salt 
River a~. the receiving waters of the dreinage. This area ts characterized 
b1 mature stands of mangroves and salt ponds that provide s1gnfffcant hlbttat 
for aquatic wildlife. 
As now outltnad, the proposed project would- not 
illlplct the Salt River Bey area, at least fro~~ a construction sUnclpoint. 
However, the deteraination remains to be 111de on whether changes in now 
·d~ to water retention w111 have an, impact on the ~ 
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surve.Ys and conversations w1th personnel froM the Yfrtin Jslancll vovern1111nt --
tftd1cat• there art no significant habitats or wt1d1tfe concentrations wtth1n 
the proposed project. Some songbird habitat w111 be 1~acttd but the effects 
would not be considered significant. Y1rg1n Islands Department of Conserve• 
tion and Cultural Affairs (DCCA) personnel will conduct a complete survey of 
the project area once the f1na1 alternative is selected. The tdea of the 
survey is to identify any significant trees o~ patterns of vegetation thit 
should be protected. It is not expect•d that such areas will be significant. 
. 
. 
Reconwnendations 
During the recent survey, it was noted that the lower portions of Mon 
Bijou/Glynn watershed channel is~everely silted up. 
The reconnaissance 
report does not address any plans to improve the lower channel, especially 
the channel area above the road before entering Salt Rtver k,y. Serious 
consideratfo~ should be given to conducting a channel clearing tn the 
lower section of the drainage in coordination with the proposed project. 
The lower section of Mon Bijou Gut w111 continue to flood unless the 
chennel ts cleared. 
tn discussions with OCCA personnel. 1t was pointed out thlt the1 would favor 
the construction-of Plan 4 which would provide adequate sto~aoe for flood 
control. It was also pointed out that local farmers _,uld be interested tn 
obtaining water rtghU to water stored in any retention structure. This 
IDI1 or 11111 not become a factor to consider in evaluating the project • 
. -.. 
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·It 11 not ant1c1peted that the project will have an adverse effect • 
f1sla 
• or wildlife spec1as. 
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cc: 
MMFS, PanaN City 
EPA • New York 
DCCA, USYI 
ARD-E, Atlanta 
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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 
REGION II 
2 6 FEDERAL PLAZA 
NEW YORK. NEW YORK 10278 
21 JUL 1932 
Mr. A • .J. Salen, Acting Olief 
Planning Division 
Department of the Arrrry 
Corps of Engineers, Ja&.sonville District 
P.o. Dox 4970 
.Jacksonville, Florida 32232 
Dear Mr. Salem: 
'!his is in response to your letter dated .June 10, 1982, inviting c:::arments on 
the study being~perfonned by the Corps on flood control measures at Estate 
fobn Bijou, St. Croix, u.s. Virgin Islands. 
D.lr agency has reviewed the 
information attache:'\ to your letter, and we ·Offer the folla.rlng catrnents: 
1. 
'!he possibility of creating retention and storage capacity for flood 
waters should be ~xplored due to present Virgin Islands water supply 
limitations. 
• 
2. 
Salt River Bay, the receiving water b:rly of present drainage, is 
characterized by stands of mature mangroves and salt ponds. 
Both 
of these provide habitat for aquatic wildlife. 
Reduced freshwater 
inflow may have impacts on fish a.burrlance, sul::rnerged aquatic vegeta-
tion, and water quality within the Bay by affecting mixing and/or 
flushing. 
'!he potential for such i.rrq?acts should be assessed for each 
scenario or plan. 
3. 
'lh'e u.s. Fish & Wildlife. Service has- indicated that th12ir surveys of 
the area found heavy silt clogging of the lO"Her channels leading into 
Salt River Bay. Plans should include a provision to clear these areas. 
Please keep us apprised of any additional developments relative to this study. 
'Ihank you for the opFQrtunity to o::mnent. 
Sincerely yours, . 
~M,(_ )1. ~~ dktt_ 
~,., Anne Norton Miller, Cl1ief 
~~ Environmental Impacts Branch 
OF'.F'ICE 01' 
THE COMMISSIONER 
• 
GO\'ER~!IIE::'\T or THE \"IRCl?< 1:--LA~\DS OF THE l'!'l"I1'ED STATES 
ClJeparlment o{ Conservalton anc/ Cultural .Jr.f{airs 
P. 0. BOX 4340 
CHARI...OTTE AMAI...IE, ST. THOMAS, V.I. 00801 
Mr. A.J. Salem 
Chief 
Planning Division 
Department of the Army 
Corps of Engineers 
P. 0. Box 4970 
September 23, 1987 
Jacksonville, Florida 
32232-0019 
Dear Mr. Salem: 
RE: Estate Mon Bijou/Giynn 
Section 205 
Flood Control Project 
St. Croix, V.I. 
The Division of Coastal Zone Management has reviewed the Draft 
Definite Project Report and Environmental Assessment for a Flood 
Control project at Estate Mon Bijou, St. Croix, Virgin Islands. 
This project is in Tier II, and not within the Coastal Zone (Tier 
I). 
However, the Department has authority to make the determination 
for federal consistency pursuant to the provisions of Section 904-7 of 
the rules and regulations of Title 12, Chapter 21, V. I. Code, and the 
Coastal Zone Management Act of 1972, as amended ( 16 U.S. C. Section 
1451, et. seq.) and the regulations governing such federal consis-
tency determinations ( 1 5CFR Part 930) which became final June 25, 1979. 
The proposed activity is consistent with the goals and policies of 
the Virgin Islands Coastal Zone Management Act. 
I find that the 
project will not directly impact the coastal zone, and do not object to 
the proposed project. 
Additionally, attached find a copy of the Water Quality Review and 
Certification for said project. 
• 
" 
• 
Mr. A. J. Salem 
September 23, 1987 
Page 2 
Should you require further information please contact me or Mr. 
Benjamin I. Nazario, Director, Division of Coastal Zone Management, at 
(809) 773-5774 or (809) 774-3320 ext. 145. 
ADS/rds 
Alan D. Smith 
Commissioner 
cc: 
James C. Savage-Commissioner, DPW 
Benjamin I. Nazario, Director, DCZM 
Project File 
GOVERNMENT OF 
THE VIRGIN ISLANDS OF THE UNITED STATES 
CHARLOTTE AMALIE. ST. THOMAS, V.I. 
DIVISION Office of the Commissioner 
April 2, 1987 
Col. Charles T. Myers III 
District Engineer 
P.O.BOX 4400 
PUBLIC WORKS DEPARTMENT 
U.S. Army Engineer District, 
Jacksonville 
P.O. Box 4970 
Jacksonville, Florida 
32232-0019 
RE: 
LETTER OF INTENT 
Dear Colonel Myers: 
IN I'IEI'I.Y ADDI'IE •• 
COMMI •• IONIEI' OP' I'U81.1C WOII 
Refer •...•.......•••..•... 
The Department of Public Works for the U.S. Virgin Islands has reviewed the 
draft report on Mon Bijou and generally concur with the findings contained 
therein. 
The Government of the Virgin Islands is ~ public body legally 
capable of fulfilling the requirements of local cooperation for this 
project in accordance with Section 221 of the Flood Control Act of 1970. 
This Letter of Intent, while not considered a binding contract, is 
furnished to document our support of this project and our intent to act as 
local sponsor for its implementation. 
We understand that following project 
approval but prior to construction, we will be asked to enter into a 
binding agreement to furnish certain items as outlined in the report. 
Specifically, we intend to: 
a. 
Provide, prior to construction, an amount equal to not less than 
25 percent of total project costs for flood control, at least 5 
percent of which will be cash. 
The amount to be provided shall 
include the value or cost of all lands, easements, right-of-way, 
and utility and facility alteration and relocations necessary for 
construction and subsequent maintenance of the project including 
suitable burrow and dredged material disposal areas, as may be 
determined by the Chief of Engineers. 
b. 
Provide without cost to the United States all lands, easements, 
and rights-of-way, including suitable disposal areas as 
determined by the Chief of engineers, necessary for construction 
and maintenance of the project. 
Colonel Myers 
April 2, 1987 
Page 2 
• 
c. 
Accomplish without cost to the United States all alterations and 
relocations ~f buildings, transportation facilities, storm 
drains, utilities, and other structures and improvements made 
necessary by the construction. 
· 
d. 
Hold and save the United States free from damages due to the 
constructio~ works, not to include damages due to the fault or 
negligence of the United States or its contractors. 
e. 
Maintain and operate all the work after completion in accordance 
with regulations prescribed by the Secretary of the Army • 
f. 
In a form acceptable to the Chief of Engineers, enact ordinances 
and promulgate regulations to prevent encroachment on the 
floodplain storage areas, channels, and rights-of-way and to 
prevent an undue increase in the flood damage potential. 
g. 
Assume all project costs in excess of the Government limitation 
of $5,000,000. 
h. 
Comply with the provisions of Public Law 91-646, Uniform 
Relocation Assistance and Real Property Acquisition Act of 1970. 
i. 
Comply with the conditions set forth under Title VI of the Civil 
Rights Act of 1964. 
Sincere
1ly, 
/I/ 
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James C. Savage 
Acting Commissioner 
JCS/GSS/csh 
cc: 
Mr. Gabriel St Surin 
DIVISION 
GOVERNMENT OF 
THE VIRGIN ISLANDS OF THE UNITED STATES 
. 
CHARLOTTE AMALIE. ST. THOMAS, V.I. 
PoO.BOX 4400 
PUBLIC WORKS DEPARTMENT 
OFFICE OF THE COMMISSIONER 
August 12-, 1987 
Mr. A. J. Salem 
Chief, Planning Division 
u.s. Army Corps of Engineers 
Jacksonville District 
P. o. Box 4970 
Jacksonville, FL 32232-0019 
' 
P.E: 
11011 BIJOU FLOOD CORTROL RBDUCT:IOR PROGRAM 
S'l'. CROIX, U.S. V:IRG:IR :ISLARDS 
Dear Mr. Salem: 
• 
IN llti!~L.Y ADDIItltSS 
COMMISSIONIEI't OP' ~U8L.IC WORKS
Refer o o o o o ooo o oo•••o•oooo o oo
As requested, transmitted are our· comments on the proposed "Local 
Cooperation Agreement " (LCA) for the referenced project. If they 
are agreeable to you, please incorporate them in the final LCA and 
forward three copies to us for execution. 
The agreement should be signed by the Commissioner of Public Works. 
Therefore, paragraphs I and II can be neglected. 
Sincerely, 
jftlw/-11 ~..;._ 
3':abriel St. Surin 
· 
Engineer and Acting Director 
of Planning & Development 
Attachment 
GSS/alg 
cc: 
Mr. James C. Savage 
Mr. Miguel Farrington 
Mr. O'Neal Abel 
L 
COVERrx:.u:NT OF 
1 
~~\ \'} Q~ 
THE ViRGiN ISLA:-m:; OF THE UNITED STATES(~\ ~~\. ?.Ur 
• 
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v 
·:or:..hS \Jt'. 
DEPARTU.EtH OF LAW 
r'j~\_\C \
1 
Norre Gade No. 46 
Charlotte Amalie, St. Thomas, V.I. 00802 
July 22, 1987 
Hon. James c. Savage 
Commissioner 
Department of Public Works 
St. Thomas, V.I. 
00801 
In reply plene refer to our 
File No. -------
Re: 
Proposed Agreement with the Department of The Army 
Dear Co~issioner Savage: 
The proposed agreement with 'the Department of the Army 
to construct a flood control project in Estate Mon Bijou, 
St. Croix has been reviewed and the following are my comment$ 
to same. 
1. 
The first paragraph on page I should be modified by 
inserting after the words "Commissioner of" on the last line 
the words "Property and Procurement on behalf of". 
2. 
The second WHEREAS cause on page I should identify 
more particularly what the Flood Control Act is. 
3. 
I am unable to determine exactly what paragraph IIg 
means. 
I can not offer any comments on this subparagraph. 
4. 
Paragraph IIi violates the provisions of 33 V.I.C. 
3101 which prohibits the contracting for amounts in excess of 
appropriations. 
If there is an appropriation in existence, 
then a contract may be executed for an amount up to that 
appropriation. 
5. 
Public works must have an appropriation to cover the 
cost of the items listed IIIb. 
This would be indicated on the 
contract by the inserting at the end of the contract the 
.Account Code and the MED number. 
6. 
Paragraph IIId provides that the Virgin Islands shall 
comply with the provision of Public Law 91-646. 
If there are 
any sums payable under this law are the funds available? 
, Hen. James c. Savage 
July 22,1987 
-2-
7. Article VI in so far as it deals with the Virgin 
Islands cash contributions is subject to the same limitations 
as set out in paragraph 4 above. 
8. Article IX is subject to the limitations as set out 
in paragraph 4 above. 
9. It may be that paragraph XVb should be expanded to 
include the Virgin Islands and it may resolve some of problems 
concerning the Virgin Islands contingent liabilities. 
10. I find no where in the proposed agreement anything 
concerning the title to the work to be performed by the Army. 
11. In addition to the items referred to in paragraph 5 
above, provisions should be made at the end of the proposed 
agreement for the signature of the Acting Commissioner of 
Property and Procurement . 
• 
·. 
/ 
Sincerely, ~ w~ 
·~ROTT 
Assistant Attorney General 
VIRGIN ISLANDS MAILING LIST 
FEDERAL AGENCIES 
Director 
Office of Federal Activities 
EPA, Region II 
26 Federal Plaza 
New York, New York 
10278-0012 
Area Supervisor 
National Marine Fisheries Service 
Environmental Assessment Branch 
3500 Delwood Beach Road 
Panama City, Florida 
32407-7403 
Director, Caribbean Area 
Soil Conservation Service, USDA 
GPO Box 4868 
San Juan, Puerto Rico 
00936-4868 
Superintendent 
Virgin Islands National Park 
National Park Service 
P.O. Box 806 
St. Thomas, Virgin Islands 
00801-0806 
Territorial Representative 
Federal Highway Administration 
U.S. Federal Building, Room 114 
Veterans Drive 
St. Thomas, Virgin Islands 
00801 
Chief 
Environmental Impacts Branch 
U.S. Environmental Protection 
Agency 
26 Federal Plaza, Room 400 
New York, New York 
10278-0001 
Regional Director 
U.S. Fish and Wildlife Service 
75 Spring Street Southwest 
Atlanta, Georgia 
~0303-3309 
Field Supervisor 
u.s. Fish and Wildlife Service 
Caribbean Field Office 
Post Office Box 491 
Boqueron, Puerto Rico 
00622-0491 
San Juan Area Office 
U.S. Army Corps of Engineers 
ATTN: 
CESAJ-PG 
400 Fernandez Juncos Avenue 
San Juan, Puerto Rico 
00901-3299 
Chief, Caribbean District, WRD 
U.S. Geological Survey 
GPO Box 4424 
San Juan, Puerto Rico 
00936-4424 
TERRITORIAL GOVERNMENT 
Honorable Ron de Lugo 
House of Representatives 
Washington, D.C. 
20515-0001 
Honorable Alexander A. Farrelly 
Governor of the Virgin Islands 
of the United States 
Office of the Governor 
Charlotte Amalie, St. Thomas, 
Virgin Islands 
00801 
Executive Director 
Virgin Islands Port Authority 
P.O. Box 597 
St. Thomas, u.s. Virgin Islands 
00801-0597 
Virgin Island Housing Authority 
P.O. Box 979 
St. Thomas, U.S. Virgin Islands 
00801-0979 
State Historic Preservation Officer 
Virgin Islands Planning Office 
Division for Archeology & Historic 
Preservation 
Chinnery Building 
129-133 Sub-Base 
St. Thomas, u.s. Virgin Islands 
00801-5000 
Executive Director 
Virgin Islands Urban Renewal Board 
P.o. Box 2295 
St. Thomas, U.S. Virgin Islands 
00801-2295 
~' 
TERRITORIAL GOVERNMENT Cont'd 
Director, Public Relations Office 
Government of the U.S. Virgin Islands 
St. Thomas, 
U.S. Virgin Islands 
00801 
Commissioner 
Virgin Islands Department of Commerce 
P.O. Box 1692 
St. Thomas, U.S. Virgin Islands 
00801-1692 
Commissioner of Public Works 
Government of the U.S. Virgin Islands 
P.O. Box 4400 
Charlotte Amalie 
St. Thomas, U.S. Virgin Islands 
00801-4400 
Assistant Commissioner 
Department of Agriculture 
P.O. Box 82 
St. Thomas,·u.s. Virgin Islands 
00801-0082 
Director of Tourism 
P.O. Box 16921 
St. Thomas, U.S. Virgin Islands 
00801-1692 
Mr. Brian Turnbull 
Director 
Virgin Islands Planning Office 
Chinnery Building 
129-133 Sub-Base 
St. Thomas, U.S. Virgin Islands 
00801-5000 
Office of the Commissioner 
Department of Conservation and 
Cultural Affairs 
179 Altona & Weigunst 
Charlotte Amalie, St. Thomas, 
U.S. Virgin Islands 
00801 
Mr. Benjamin Nazario, P.E. 
Director 
Coastal Zone Management Division 
Department of Conservation and 
Cultural Affairs 
179 Altona & Weigunst 
Charlotte Amalie,St. Thomas, 
u.s. Virgin Islands 
00801 
Director 
Virgin Islands Planning Office 
Chinnery Building 
129-133 Sub-Base 
St. Thomas, U.S. Virgin Islands 
00801-5000 
Mr. Gabriel St. Surin 
Special Assistant 
Department of Public Works 
Government of the U.S. Virgin Islands 
P.O. Box 4400 
St. Thomas, U.S. Virgin Islands 
00801-4400 
Mr. O'Neal A. Abel 
Assistant Commissioner 
Department of Public Works 
P.o. Box H~ Christiansted 
St. Croix, U.S. Virgin Islands 
00820 
Department of Conservation and 
Cultural Affairs 
Division of Fish and Wildlife 
Box 1878 Frederiksted 
St. Croix, U.S. Virgin Islands 
00840 
GOVERNMENT OF 
THE VIRGI_N ISLANDS OF THE UNITED STATES 
CHARLOTTE AMALIE, ST. THOMAS, V.I. 
P.O.BOX 4400 
PUBLIC WORKS DIPARTMINT 
DIVISION 
Office of· the Cc:mnissioner 
August 5, 1987 
Mr. A. J. Salem 
Chief, Planning Division 
U.S. Army Corps of Engineers 
Jacksonville District 
P. 0. Box 4970 
Jacksonville, FL 
32232-0019 
RE: 
M:N BIJOU FI1XD cx:NI'OOL. PROJECT 
st. CroiX, ·u~s~ Virgin· Islands 
Dear Mr. Salan: 
We have reviewed the Draft Definite Project and Environmental 
Assessment Report for the referenced project and cbncur with 
your reccmnendations and the proposed alignment. 
CONNISSION&It OP' PU.I.IC WORK •
.... , ........................
We v.uuld like to note the attached letter to and fran the Federal 
Highway Administration regarding the construction cost of the new 
bridges. It appears that we could eliminate the installation of 
one bridge. This would reduce our local share and help us finance 
the project. 
Please let us have your thoughts on this proposed change. 
Sincerely, 
·LI~ 
St'.. Surin 
Eng1neer and Acting Director 
of Planning & Developnent 
Attachments 
GSS/alg 
cc: 
Mr. James C. Savage 
Mr. Miguel Farrington 
Mr. Aloy Nielsen 
/ 
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Di\'lSIC>N 
Of:f ice of the Commissioner 
July 17, J 9S7 
~~r. Ste\·e F.apley 
T c:-rritor ial Represern:.a T i ,·es 
Fec::-ral Riglw:ay Adninistr2.1 ion 
Fecir:>ral BuiJ ding, Ro~m l3S 
St. Tho:r.2.s, V. I . 00801 
Dear Mr. Rapley: 
Tne Anny Corps of Engineers has distributed the Draft Definite Project 
and Environmental Assessrrr2nt Report to '\'arious concerned agencies for 
comnents. 
We are in favor of the proposed plan. 
Hm;ever, it calls 
for the installation. of three (3) b:irdges, and we w::mld like to know 
if the Federal Highway Administration can provide the funds for the 
construction of the three bridges under the "Bridge Rep)acenent 
Program". 
It is anticipated that the construction plans for the Kadir Gut Project 
will also include one bridge on Highway 30. 
Sincerely, 
.fdtJ_,/1~ 
p19abriel St. Surin 
Engineer and Acting Director • 
of Planning & Development 
GSS/alg 
:: .. 
( 
·C~ 
U 5. DEPARTMENT OF TRANSPORTATION 
c 
F £,-,ERA L H IGHW f, Y 1.. Dt·'l N:S~ o; A TtON 
REGION ONE 
Federico Degetau Federal Building 
and U. S. Courthouse 
Room 15n, rerlos Chardon Street 
Hato Rey, Puerto Rico 00918-2288 
July 28, 1987 
Mr. James C. 
Sava~e, Commissioner 
V.I. PublicWorks Department 
P.O. Box 4400 
St. Thomas, U.S. V.I. 
00801 
Attention: 
Mr. Gabriel St. Surin 
Acting Director of Planning and Development 
Dear Mr. Savage: 
Subject: 
Mon Bijou Flood Control Improvements 
IN 
A~PLY AE~ER TO: 
HVI-01 
The Virgin Islands do not receive an apportionment of Bridge Replacement 
Program funds. 
The three bridges required by the subject flood control 
.· ~oje~t could be funded from either Territorial funds or Primary funds 
~f ~e roads are included on the Federal-aid primary system). 
if!) 
LtJ 
l-ha~ taken the liberty of discussing the subject project with both 
~. ~lio Colon and Mr. A. J. Salem of the Corps of Engineers. 
Mr. Salem 
~ 
~orted that execution of the agreement to fund the project by 
C6mm~ioner Savage is the next action required to continue the design of 
@is ~oject . 
...:: 
~ 
-
Cl 
~m~ailable to meet and discuss FHWA participation in the construction of 
tne roadway and bridge improvements, if you so desire. 
cc: Mr. Aloy Nielsen 
Commissioner James C. Savage 
s!il:o?44 
Stephen K. Rapley 
Territorial Representative 
United States Department of the Interior 
FISH AND WILDLIFE SERVICE 
CARIBBEAN FIELD OFFICE 
P.O. BOX 491 
BOQUERON, PUERTO RICO 00622 
June 17, 1987 
Mr. A.J. Sal em 
Chief, Planning Division 
Jacksonville District, U.S. Army Corps of Engineers 
PO Box 4970 
Jacksonville, Florida 32232 
• 
Re: Environmental Assessment, 
Estate Mon Bijou, St. Croix, 
U.S. Virgin Islands 
Dear Mr. Salem: 
This is in response to your May 29, 1987, letter requesting our 
comments on the Environmental Assessment for the Estate Mon Bijou 
flood control project. 
We have assigned Log #4-4-87-052 to this 
activity and would appreciate your referring to it in any future 
correspondence on this matter. 
We concur with your determination that the project would have no 
adverse impact on Federally listed threatened and endangered species. 
No significant impact on wetlands is anticipated. 
We therefore do not 
object to the project as presently designed. 
This does not constitute a Biological Opinion as described under 
Section 7 of the Endangered Species Act. 
However, it does fulfill the 
requirements of the Act and no further action is required. 
If 
modifications are made in the project, of if additional information 
indication potential impacts to listed species becomes available, 
consultation should be reinitiated. 
cc: 
COE, San Juan 
EPA, New York 
AWE, Atlanta 
Sincerely, 
Robert T. Pace 
Acting Field Supervisor 
• 
Colonel Charles T. Myers, III 
UNITED STATES DEPARTMENT 0~ COMMER~E 
N•&lon•l Oce•nla •nd A&mo•pherlo Admlnl•&re&lon 
NATIONAL MARINE FISHERIES SERVICE 
Southeast Regional Office 
9450 Koger Boulevard 
St. Petersburg, FL 
33702 
June 12, 1987 
F/SER113/SD 
District Engineer, Jacksonville District 
Department of the Army, Corps of Engineers 
P.O. Box 4970 
Jacksonville, FL 
32232-0019 
Dear Colonel Myers: 
The National Marine Fisheries Service has reviewed Draft Report and Environmental 
Assessment for reducing flood damages in the Estate Mon Bijou and Glynn 
residential areas on St. Croix, U.S. Virgin Islands. 
Since the project will not impact marine resources, we have no comments. 
We 
appreciate the opportunity to review and comment on this project. 
Sincerely yours, 
~~~ 
~Richard J. Hoogland 
Assistant Regional Director 
Habitat Conservation Division 
United States Department of the Interior 
GEOLOGICAL SURVEY 
GPO Box 4424 
San ~uan, Puerto Rico 
00936 
Mr. A. J. Salem 
Chief, Planning Division 
Department of the Army 
July 8, 1987 
Jacksonville District, Corps of Engineers 
PO Box 4970 
Jacksonville, Florida 32232-0019 
' 
Subject: Draft definite project report and environmental assessment for 
estate Mon Bijou, St. Croix, U.S. Virgin Islands. 
Dear Mr. Salem: 
Our technical staff has reviewed the subject report and agrees on Plan D· 
as the best alternative. 
The proposed bypass channel will reduce flood 
damages and related problems in the area. 
AZ/ECD/an 
Sincerely, 
( 
~~ 
Allen L. Zack 
District Chief, WRD 
• 
CO\T:ll:\~I·E\1' OF THE VIRGIN ISL\.:\DS OF THE UNITED STATES 
Department of Conservation and Cultural Affairs 
Division of Fish and Wildlife 
BOX 1878, FREDERIKSTED 
ST. CROIX, U.S. VIRGIN ISLANDS 00840 
13 July 1987 
A. J. Salem, Chief,Planning Divis!on 
Flood Control and Flood Plain Mgmt. Branch 
Department of the Army 
Jacksonville District, Corps of Engineers 
P. 0. Box 4970 
Jacksonville, FL 
32232-0019 
Dear Sir: 
Re: 
Draft Definite Project Report and 
Environmental Assessment, Estate 
Mon Bijou, St. Croix, Virgin Islands, 
dated May 1987. 
The St. Croix staff of the V.I. Division of Fish and Wildlife 
(DFW) has reviewed the subject Report and Assessment as requested 
by your letter of May 29, 1987. 
We find that the proposed'project, as described in the subject 
document, is not expected to have any significant impacts, direct 
or indirect~ on fish and wildlife. 
We know of no published reports of, nor the existence of, any 
species, in the project area, currently listed or proposed to be 
listed as endangered or threatened by the U.S. Department of the 
Interior. 
This determination is made without benefit of field visits 
to the area, but rather through the knowledge of the known occurrences, 
habits and habitats of these species in the Virgin Islands. 
We reauest that the St. Croix staff of DFW be retained on your 
mailing list for this project and that we be duly notified of all 
modifications or alterations to the plan as presented in the subject 
document. 
. 
DIV!.:ION OF FISH & WILDLIFE 
Room 203 Lagoon Street Complex 
frederiksted, U.S.V.I. 00840 
A.J. Salem, Chief Planning Division 
13 July 1987 
Page -2-
Thank you for allowing us to review this plan. 
Sincerely, 
{~~,_,_ 
William~ Tobias 
Fisheries Biologist II 
orr1cc or 
T 1 1C COMMIS:.510fH:.Il 
GO\'ETI'Nl\IENT OF TilE VIRGIN ISL\NDS OF '!'!TE 'l'i'\ITED ST.\TES 
--0--
DEPARTMENT OF PLANNING AND NATURAL RESOURCES 
July 31, 1987 
Mr. A.J. Salem 
179 ALTONA 8c WELGUNST 
CHARLOTTE AMALIE, ST. THOI\11\S, V.I. OOflO.-::! 
Chief, Planning Division 
Department of the Army 
, Post Office Box 4970 
Jacksonvi1le, FL 
32232-0019 
Re: 
Federal 
Consistency 
Flood 
Control 
Diversion 
Channel for Estate Mon Bijou, St. Croix, U.S. Virgin 
Islands 
Dear Mr. Salem: 
We 
have 
reviewed 
the draft 
project 
report 
and 
Env.ironment Assessment for the above referenced project. 
This project while a 
direct federal activity is 
situated entirely within tier II zone and does not affect 
the Virgin Islands Coastal Zone (tier I). 
We find the 
project to be consistent with the Virgin Islands Coastal 
Zone Management (CZM) program and concur with the report 
pursuant to Section 904-7 (c) of V.I. Code, Title 12, 
Chapter 21 rules and regulations. 
Enclosed for your information, 
I submit the Water 
Quality Review and Certification for this project. 
Mr. A.J. Salem 
Federal Consistency -
Mon Bijou 
July 31, f987 
• 
Page 2 
Should 
you 
require 
further 
information, 
please 
contact me or Mr. Benjamin I. Nazario, Director, Division· 
of CZM at (809) 773-5774 or (809) 774-3320, extension 
145. 
Commissioner 
ADS/mm 
· Enclosure,( 1) 
cc: 
Commissioner James C. Savage -
PWD 
Thyra Budsan, Chief -
A-95 Clearinghouse 
Gabriel St. Surin -
PWD 
Francine Lang -
DNRM 
Benjamin I. Nazario- DCZM 
GOVERNMENT OF THE VIRGIN ISLANDS OF THE UNITED STATES 
. 
. 
f) epartm C'fl t of Cnrrurvatinn and Cu/111 ral Affair.~ 
Natural Resources Manageme11t 
BUILDING II 1 - APARTMENT 114 -WATER GUT HOMES 
CHRISTIANSTED, ST. CROIX 00820 
(809) 773..0565 
COASTAL ZONE PERMIT APPLICATION 
WATER QUALITY REVIEW AND CERTIFICATION 
1. CZM Permit ·Application No.: N/A 
2. Date of Appl ication:_•i~l\~!87 
3. Applicant: U.S. Army Corps of Engineers, Jacksonville District 
4. Short Title of Work: Flood Control Diversion Channel For Estate 
Mon Bijou 
5. ~~ater Quality Certification: Pursuant to Title 12, Ch. 7, Subch. 186 
or-the Environmental Laws and Regulations of the Virgin Islands 
there is reasonable assurance that the proposed project can be 
executed without violation of the water quality standards. 
6. Additional Information Requested or Needed for Certification: N/A 
7. Comments or Special Restrictions: N/A 
8. 
t•3rd YEAR 
ST. CROIX, U.S. VIRGIN ISLANDS 
WEDNESDAY, JULY 1,1987 
No. 150 
·some Workers. Happy With Checks 
Others .Complain It Is Not Enough 
--4.-
Jetllp'li Daniels of Public Works Ill-s off his chock. 
Avis photo by Jamn Wolks Jr. 
$15 Million Complex 
Planned ForCaneBay 
By John Commins 
"-~~'*' ,_ Wriw 
CHR.riANSTED, 
ST. 
CROIX CAPI -
A St. Croix 
........ It 
_.,.ny ... 
llllbmlftld ~~~- ., .. c:-tal 
Zona ...,..._ afllat for 
' I '" lllillion 
.-ldlntill 
.-1 --X llong C... 
lilY. an Clfflciel •Ill T...-y. 
Aaconllnt ., Vlrlln lolencll 
.... .. perM*It afflot 
IIIUit clltermil\e " .. ~~~-
.. COfYIPI.eto and tt.. ldloclule 
a public Nlring within 80 
days. 
· · Suun Baatreu, Vice ..,.... 
d.tt of Antilles lnwt1m011t. 
Group, llid the plan "is the 
lint llllmltiw for the land" 
--- of the NNiativoly low 
population chnslty'' called for 
by-joeL 
Antilles ln-t ...,...,, 
See COMPLEX Pill" 23 
By Jomos Wttks Jr. 
Avis Staff Writer 
Thousands of worket"s re· 
ceived checks Tutsday as S8 
million ... dollars in ulary in· 
croasn _,. officially released 
by the V.I. Government. 
Some whooped with de· 
light, but many others cringed 
in pain when they saw how 
much they were ICtualiy re· 
c:aiving. 
Joseph Daniels, a Public 
Works .,ployoe with 22 years 
of Service. fell into the cringing 
category. 
He only received 
$148.96. "I don't know what 
kind of money this be," he 
shouted angrily. 
"I deserve 
more·•. 
Daniels pointed out that he 
only makes $10,000 a year 
reading water meters, 1nd he 
has to sell newspapers to sup-
plement his income.· 
"Thot 's not enough .. " said 
one ·Health Dep,ertment em· 
pioyoe who uked not to be 
identified. 
uSome 
peooJe 
wanted money to send their 
kids to school. They gon' have 
btchanai in this ploce, me 
son". 
But other government em-
ployees 
11w 
it differently, 
"I'm happy with what I got. I 
would have liked to get the 
whole damned thing but I'm 
still 
happy," · said 
Henry 
Schutter, a 17 yoar emplOyee 
~ 
fiORKERS P~~:e 24 
Mon Bijou Residents Elated 
Flood Relief Within Sight 
By Andre Edwin 
• 
Avis Stoff Writer 
More thon 40 Mon Bijou re-
stdents attended a mMt lng liSt 
night to Iiston lnd ask Quos-
lions about 
1 flood-control 
--'· which could save 
property in thot area ond, ·' 
perhaps, oven lives. 
The propo111, the result of 1 
studv dOne bv. tho Army Corps 
of Engineers, is ostimoted at 
$3.9 million and was reQuested 
~ tho Deportment of Public 
Works. Officials from both or~ 
t~niutions attended the m•t· 
ing It John H. Woodson Junior 
High School. 
Accord 1ng to reports. b• 
t-n 1975·1980, three major 
floods 
occurred in the Mon 
Bijou are1, causing widespread 
New Division Set 
For Human Servi:es 
By J011ico Thorpe Davis 
Avis Stoff Writer 
Governor 
Farrelly 
issued 
his 
first 
exea.:tive 
order 
yesterday 
outlining 
the 
functional 
fn~rnework of the 
newly created Department of 
Humon Services which will be 
Naded 
by 
former 
Social 
Welfare 
Commissioner 
Juei 
Rhymer. 
As lptCiflod by Act No. 
5285, 
the 
rectntty PIIIOd 
Go!Mrnmont and Contolida-
don Act of 11187, the Depart· 
mont Nd ._n dn91al*l 
os tho umbrella 1111f1CY for all 
-
•nricos ponalnlnt .. 
you1h, childrwl, the handi-
capped, .. elderly and low-
._.. adults and t.milios 
eu1hori•d 1D 
~Iva funds 
LWidor the Older AINriCIInl 
Act and COm....,itv Services 
Block Grant funds. 
In ..,_t with Rhymer's 
earlier proposal to structure 
the 
new 
department 
into, 
six 
divisions 
and 
initiate 
personnel 
changes, 
Farrelly 
said in his order that the new 
Human Services will include: a 
Division 
of Adult Services; 
Senior 
Citizens 
Affairs; 
Children, Youth and Families; 
Financial 
Programs; 
Hindi· 
copped Services; and Volun-
...,. and special programs. 
The six departments will 
be 
Nlded by 
I 
pemor 
appoinl*l 
ldmlnistraiDr 
NIIO'Iintl ., an assistant com-
milaioner. 
Programs 
within 
each division will be mlftlllld 
by a program clii'KIDr rapon-
ing .. .. division lllmlnt. 
-r. 
Early last . w.k Rhymer 
IMd the Social Wolfere Depart· 
,_t -.old be -
of the 
SeeNEWP .. 23 
domogo. The propolll eons for 
a "95" porcont flood reductiOn 
ovor tho next I 00 y•rs. 
Officials llid that tho work 
should bogin next year and 
completed within two years. 
They oxploined thot tho 
plan calls for the flood water 
going around the undeVeloped 
~rt of tho Mon Bijou ••• 
instood of through the com-
munity. The Army Corps will 
pay for more than half of tr. · 
project, and the loCII gov•· 
ment will fund the b1tan .. 
officials contended. 
IN/roy P~t~rvn, 11 rrsi-
d~nt. mid, '1 11m 
~llltrd 
thtzt this is ~oing to b~ 
don~. Whtzt · 11 lot of .41on 
Bijou 
rrsid~nts 
hlll'~n 't 
rNUnd is thllt th~ floods 
hiiW d~pl'rdllt~d th~ 'WIIM~ 
of thnr hom~s. '1 think 
thl& u .om~thlng th11t u 
lollg 
o~rdll~. It mould 
line bHn 
don~ yean 
40-" 
John 
~,;ria, -or ·,.: 
IDUI'CI 
plamer 
and . ltUdV 
_.....,. for the Mon Bijou 
project. •Ill the flooding .. 
-.sod by _,.. problems ln-
dudlng 
llrp 
volumes 
of 
-
_.... ..... 8luo 
MounUin and Cllhar. -., 
sl-• 1n the -· exlstint 
aulwrtl .. -
1111111 .. 
~ 
RESIDENTS Pep 28 
-,~,x.· '•st~l $•tvie• lnet••s•i Pe) F11nt/sFot l11111i 
. -
- . . --
. 
. 
. 
. 
WIONEsDAV, .AJLY 1~ 1.7 
150 
THE ST. CROIX AVIS 
::;::;.;;=:=:.:.:::.:..:.::..:.:~---_;_:-------------------should haw 
been 
ourted 
~" • •JC · · 
Librory (Frederikstedl. 
when the onc!Cient- occurred. 
,........ OM_, 
said •• tho ca• is -
and 
sooner. 
· 
· 
t(Continued freia- 5)'. 
The Pre-School Grlftt Pro· 
finished." 
Ralph Mandrew, pK.dent 
r-e-
posal is a 1-'hY document 
Tha other official, Germ., 
of the Mon Bijou H~wners 
"lthll Commllllon. 
:~ t':':!!..=::~ 
CO: site 
Rieckehoff Sampayo, Puerto 
~=:.~~~';d =d~t ~ :,~ 
Tha AppMit Court would 
.,. 
Rico's 
Olympic 
Committee 
-tion rwgarding the time: 
...,lace tho 
London-lined 
BRIEFS . . • • 
President lfld a member of 
Uble to begin work on the 
Pt!Yy CouncH, which now is 
(Continued from Pap 2)' 
the 
International 
Olympic 
project. 
tho -.rt of last resort for 
bellots 
(so-called 
"symbol 
Committee, said· .he feared a 
"We wanted to hear that 
aiminaJ cateS that originlte 
votes") to the extent 1hat 
rwptive reception in Indian of 
they are ready to beg•n work 
iQ Brluin's former colonies. 
the intent of the voters could 
the 
more 1han 200 island 
on the project •mmed•atelv 
... 
woutd 
rnpectfuUy 
be determined. 
athletes Panntng 10 partici-
People have lost the•r homes 
suggest that the maturity of 
-
SUipleton 
prevailed 
in 
pate 
in 
the Pin American 
because of the floods. and we 
our democracy requires that 
district court and a court· 
Garnes 
set 
10 
start 
in 
are tired of band·a1d gesturE-s." 
we hive our own court of 
order recount of the ballots 
Indianapolis Auqust B. 
According to PubliC Works 
appe1l, 
thus 
removing 
tho 
resulted 
in 
the 
defeat 
of 
NEW . . . 
CommiSSIOner 
James Savage. 
necassity to go OU1Side of our 
fa< mer Senator .lime• O'Bry1n, 
(Continued from ·Page 1) 
Gov. Alexander Farrelly was 
:,U:,!ri;:ab::,.fi:'d :~ :.:.g~s:•;~ln=C:::~:t. ~~ 
areas most affected by there-
::~ou~e ~ro;:;d~~d.p1·1~c~i~ 
It 
the 
summit's 
or-ning 
the 
•ating 
of 
democratic 
organization, which was signed 
vtew, it 
is .. high pnOIIty." 
ceremony. 
senator David Puritz. 
~~~~cJ~~h~~~:~n~r:rive~~~ 
"The 
Army 
Corps 
of 
is ·~hi~~:~YPr;~t ~nc~ to lnmcodome:zn:ingth~n t:~:~ 
ment anencies in two. The new 
Engineers 
feels bevery 
strong 
Human Services agency, she 
that there must 
part•c•pa 
longer exist 
side by 
Side 
system in the Virgin Islands, 
said 
then. 
will absorb the 
t•on from the CltiZPns that 
with independence:· Robinson 
Stapelton served warning that 
the 
project 
bene'f•ts." 
sa•d 
said. 
'We must not shirk 
she 
will 
oppose any 
move 
previous Communcty ServiceS, 
Lt. CoL Charles Cox, deputy 
the responsibility to be final 
to 
acquire 
10-called 
"tabu· 
Community 
Actton Agency, 
distrtct engineer tor Puerto 
arbiters of our own destiny." 
lators" instead of electronic 
Youth Services Administration, 
Rtco and the VIrgin Islands. 
The prime m1nister met in 
voting machmes as prov1ded 
Commission on 'Youth, Com· 
Among the loc.al senators 
closed sessions for a second 
for 
in 
the election reform 
misston on Agmg, Commission 
who 
attended 
the 
meeting 
day Tuesday. A press br1efing 
act 
of 
1984 
because 
the 
on the Handicapped, Develop· 
were Douglas Canton. Al1c1a 
was sct">eduled for late '" the 
problems of spoiled 
ballots 
mental 
Dcsabtlltles . Council 
"Chucky" Hanser and Dav•d 
afternoon. 
and recounts would still be 
and Board of Socu~l Welfare 
Pu1112 
The summ1t's 
fmal com· 
with U5. 
Farrelly's off1ccal dtrectl\i': 
Canton satd the project 1s 
muniQue was to be tssued on 
'With 
electrontc 
votcng 
also established a Board ()f 
unprecdented, 
while 
Hansen 
Fnday. 
mach1nes, 
spoiled 
ballots 
Appeals for all welfare pro· 
commented 
that 
.t 
was 
a 
On regional topics, Robin· 
whtch 
result 
tn 
the 
dtsen-
grams 
and 
two 
advtsory 
''positive effort" 
son 
said 
he 
favored 
the 
franchtsement 
of 
hundreds 
~~act~,·lit~~n ~~~?~·:~~~u~:~ 
co··1PLEX . . . 
pollt1cal untfication proposed 
(and 
somettmes 
thousands) 
(Continut>d from Paat> 1) 
by the seven-member organtza. 
of 
voters 
and 
the 
endless 
to 
advocatP 
the 
nghts 
o4 
.... 
uon 
of 
Eastern 
Caribbean 
recounts 
and 
court 
chal-
persons 
with 
developmental 
she sa1d, wants to corJstruct 
States. 
lenges would no longer plague 
disab1lit1es; 
and an advisory 
121 
twd-and·three 
bet! I oom 
On Tnnidad and Tobago 
our electoral process," Staple-
counc11 on Agcng to prov1de 
townhousP uncts. w1th a rec· 
topics, 
Rob1nson 
says 
he 
ton said. 
mput on all matters concernmg 
1eati._:)n area and a restau.rant. 
sees no cracks in his ruling 
In 
conc~us 1 on, Stapelton 
tne development of the Tem· 
The proJeCt 
1s planned on 42 
Nat10nal Alltance for Recon· 
said she 
1s extremely pleased 
tor tal plan for the agcf'1q 
acres o1 h 1Hs 1de property alo11Q 
struct1on Coalition; his govern· 
with Senator Puntz's appeals 
RESIDE:'4TS . , 
the eastern portion ot Cane 
ment is consioering divesting 
court -victory 
wh1ch 
she 
{Continued from Page 1) 
Bay, 
accordmg 
to 
plans 
f1ve 
of Tr;n•dad's approxi· 
expected all along. And she 
submitted with the government 
mately five dozen state in· 
observed wryly: "If Jimmy 
handle the amount of water, 
coastal 
zone 
management 
dustries; 1nd his government 
O'Bryan 
had 
tolloYtled 
my 
and the housing development 
offcce. 
is commjttltd to diversification 
advice and run as a Democrat, 
is built 1n a flood plain. 
If the project is JPP1oved, 
away from oil into natur1l gas, 
he 
would 
have 
been 
re-
Mon Bijou area residents 
construction 
WLII 
start 
in 
aericulture, 
tourism 
and 
elected to a •cond term in 
said they were pteased that 
January and will take two 
m1nufecturing. 
the senate." 
the flood 
problem will 
be 
years to complete. 
"We have 
in 
mind MW 
reduced or perhaps eliminated. 
She 
said 
the 
Antilles 
(natural g~sl projects we hope 
HANSEN •; • 
Delroy Petersen, a re•ident, 
will come on stream in 1 (Continued from P~e 2) 
oaid, "I am elated that thi• is 
matter of two to three years," 
build in~ but to guide our 
going to be done. What a I at 
he said. "We 1re daveiDping 
school 
· children. 
1 
will 
of Mon Bijou resident> haven't 
the potential of our II' ,. 
anempt 
to 
correct 
th1s 
realized is that the floods have 
sources in order 1D have I 
oversight with my legislation, 
depreciated the value of their 
smooth 
1ransition 
from 
concluded Senator Hansen. 
homes. "1 think this is some· 
dependence 
on 
petroleum, 
thing that is long overdue. It 
but not to deptndenar on 
WOMEN'S • , • . 
~ 
should have been done years 
gas. 
(Continued from Page 24) 
1g0." 
.. Our .... t w.kneu • 
Another 
resident 
com-
been our dllpend...ce on -
men's side has been eliminated. 
mented that it would be In 
resource, petroleum," Robin· 
Australian Peter Doohan -
understatement for him to say 
10n 
said. 
"What 
we 
are 
who uput two-time defending 
that he was happy for the 
~tkin_g 
~. do 
now 
is to 
ch1mp Boris Becker last week 
flood-control project. 
diwrsofy.... 
-
lost to Slobodan Zivojinovic 
At leost one peroon, how-
Heads of government crf 
of YugosiiYil in str1ight sets. 
ever, said that the project 
111 13-members of CARICOM 
Cl 
S 
were In ett.ndanoe. 
OFF1 
AL ... 
Tha members •• Antit111-
(Continued from P•e 24) 
Barbuda, Dominica, Grenada, 
the policam1n told .,th«i· 
iMont11rr1t, 
St. 
KittJ.Nevis, 
ties Knight slugged him. 
St. Lucil, St. Vincent and the 
Grenadines. Jltnaica, Trinidld· 
Knight, 
while 
in 
PUino 
.,d 
Tobago, 
Balize, 
tho 
Rico, 
w1s 
not 
Ulken 
into 
Bahama, Guyen1 and larb• 
Cllstody and refuud to dit 
dos. 
Cllll the matter with IUth«i· 
-ON-
-
· 
ties. He left San Juan It the 
EDUCA11 
• • • 
end 
of 
the 
P~~r~ American 
(Colitinued from P• 2) 
Games 
oind 
ratumed 
to 
Office (Cruz B1yl 
Indiana. 
St. Croix: Curriculum C.n· 
Two offici1l1 list Friday 
ter 
(Kingshilll; Early 
Child· 
apposed &~ch I move on the 
hoOd Office, Dept. of Educe· 
pen of PUirto Rico's govern-
lion Midqulners; Florence A. 
menF:_-r 
Gov. 
Clrlos 
Willitml 
LibrlfY 
(CIIristiln· 
- .. ~ 
ntdl; and the Patersen P•"blic 
Romero 
Barcalo, 
in 
office 
West End 
Residents ... 
CLASSIFIED ADS 
for the 
ST. CROIX AVIS 
are accepte<l at 
RAINE'S of St. Croix 
Tradcwinds Building 
FREDERIKSTED 
9:00a.m. -5:30p.m. 
Mondlly rhru Satwdtly 
Poge23 
Obituary 
KEITH 
tHAYNE 
AN· 
THONV 
PE:TERSEN. 
18, 
a 
'k,a .,K1ambo." of No.1· 
61A Esto.1e Cad1on, died 
n 
Friday. J.uw 26th w F u 
n 
County Gco1~'" 
He 
l!t 
sur, l'>~·rt 
b\ot' h1s 
tathet, Cornt>i; p. t.·• ~~· S1·. 
a1'rl 
hcs 
motnt 1 
~lrlllt"n 
w\liharns. 
H1i 
~JI<~'II'IIc•lt'L\ts, 
Hvac11lti1 Willian'::. .,, .. , lima 
Ctntl on 
thrt't· 
~•stt!r:.. 
KhadiJJ MJftt,e.-.., Co111~e 4fd 
Chast1dy 
Pete• !.C'". 
~kn 
b•othe•s. 
Kt1•d1l 
v..,111Jms. 
Co•nel 
J• .. 
Co1ey. 
Cal .... m 
Cca•g, Co• dell ana CJ,ff Pete1· 
sen: two Junts. 1'-.ngeta N•el· 
sen and llmJ ftan .... ~. 
!,\1'€ 
.1ncles, 
James 
Peterst"n, 
.Jctave, 
Oscar. Gerald and 
Glenn 
Wtlltams. 
numerous 
great aunts and g1 eat uncles; 
other rPI attves and tnends. 
Funeral serv1ces will take 
place at Holy Tnnlty Luthe· 
ran 
Church 
on Thursday. 
July 2nd, at 2 p.m. Interment 
will folloVv 
en the Freder1k· 
sted 
Cemetery. 
Funeral 
an angements are by James 
~ 1 ron1nnal Funeral Home Inc 
Investment 
G• oup 
has 
planned "the prOJeCt wcth our 
ears open tn an attempt to 
allay the fears" of establiShed 
Cane Bay and nearby La Vallee 
rescdents 
"I thcnk people feat that a 
development such as thts bL•dt 
near 
them m1ght cause d•s· 
placement because of mflated 
property values," Ms Bastress 
sa1d. 
"This 
ts 
becom1ng an 
1Ssue surrounding all devplop-
ment tn the V1rgin Islands." 
The 
Antilles 
Investment 
Corporation 
also 
operates 
Schooner 
Bay 
and 
Colony 
Cove 
Condominium 
com· 
JMexes on St. Croix. 
Thursday. 111/y 2 · 
ORIENTAl !loiGHT 
Saturday. July 4-
BEACH BARBECl E 
& FIREWORKS 
Resrn·ations sut(~C'S1t·d 
SUNDAY BRliNCH 
11:30 e.m. ·2:30p.m. 
772.0100 
1'11t-
M001fAArt.lt ~~ 
Live 
Entertainment 
You~ n•w holla, Marty 6 Gna 
Abbott PftHnt S1'!:VE GUTH· 
RJI! MoD •• PETER 6 EILEEN 
T.u •• THE SNOWS. wttb the 
but .-u., Nualc on St. X 
WM. • Sat .• 6 o,_ Mike Sun. 
43A Q&IU" C.rou 
S-J~35 
,, lhf' Lndu not•l