GROUND WATER RECORDS FOR ST. CROIX, 
U.S. VIRGIN ISLANDS 1969-1973
By 
Hector M. Colo'n-Ramos
U.S. Geological Survey 
Open-File Data Report 83-546
Prepared in coopration with the
Caribbean Research Institute 
College of the Virgin Islands 
St. Thomas, U.S. Virgin Islands
San Juan, Puerto Rico 
July 1983
UNITED STATES DEPARTMENT OF THE INTERIOR
JAMES G. WATT, Secretary
GEOLOGICAL SURVEY 
Dallas L. Peck, Director
For additional information 
write to:
Chief, Caribbean District, WRD
U.S. Geological Survey
GPO Box 4424
San Juan, Puerto Rico 00936
(Telephone: (809) 753-4414)
Copies of this report 
can be purchased from:
Open-File Services Section 
Western Distribution Branch 
U.S. Geological Survey 
Box 25425, Federal Center 
Denver,Colorado 80225 
(Telephone: (303) 234-5888)
CONTENTS
Abstract ............................................................. 
1
Introduction ......................................................... 
1
Purpose and scope ............................................... 
1
Climate of St. Croix ............................................ 
3
Collection of ground-water data ...................................... 
3
References ........................................................... 
5
Appendix 1. Water levels at Mahogany well ............................ 
6
Appendix 2. Water levels at Airport uiell ............................. 12
Appendix 3. Water levels at Castle Coakley well ...................... 17
Appendix 4. Water levels at Adventure well ........................... 22
Appendix 5.. Water levels at Barren Spot well ........................ 26
Appendix 6. Water levels at River Gut well ........................... 2?
ILLUSTRATIONS 
Figure 1. 
Map showing St. Croix and the location of ground-water
and rainfall stations ..................................... 
2
 
2. 
*^ap showing rainfall distribution on St, Croix for 1963-64*
and annual average from 1915 to 1967 ....................... 
4
3. 
Hydrographs showing water levels at Mahogany Well
and rainfall at the innaly precipitation station .......... 11
4. 
Hydrographs showing a/ater levels at the Airport Well and
rainfall at the Kingshill precipitation station ........... 16
5. 
rtydrographs showing water levels at Castle Coakley well
and rainfall at the Kingshill precipitation station ....... 21
6. 
Hydrograph showing water levels at the Adventure well ..... 25
7. 
Hydrographs showing water levels at the Siver Gut and
Barren Spot Wells ......................................... 27
III
IV
GROUND-WATER RECORDS FOR ST. CROIX, 
U.S. VIRGIN ISLANDS, 1060-73
ABSTRACT
Ground-water levels at selected wells in St. Qroix* the largest of 
three U.S. Virgin Islands* u»ere -nonitored from 1969-73. 
Continuous re- 
cording instruments were installed at Mahogany* Castle Coakley* Airport* 
and Adventure wells* in central St. Croix, 
Monthly observations of in- 
stantaneous ground-water levels were also made at tu»o wells near Barren 
Spat and River Gut. 
Precipitation data from National Weather Service sta- 
tions near the Mahogany* Airport* and Castle Coakley wells are shown with 
the watei level data.
INTRODUCTION 
Purpose and Scope
St. Croix* the largest of the three U.S. Virgin Islands (about 84 
square miles) is located about 50 miles east-southeast of San Juan* 
Puerto Rico (figure 1). 
Water is not an abundant resource in St. Croix* 
with no perennial streams and limited ground-water resources (Jordan* 
1975). 
The aquifers are small and shallow and in many areas produce 
saline water.
The population of St. Croix has increased dramatically to about 
48*000 (1980 census). 
As a result of the population growth* water de- 
mands have also increased significantly. 
Ground water* although limited* 
is an important component df the water supplies of St. Croix. 
Water 
jells contribute about 1.1 million gallons per day (^gal/d) for domestic 
uses in the island ( Fernando Gonez-Go'nez* personal communication).
64°50'
64046'
64°40'
64°36' 
I
17°45
17°40f
CARIBBEAN
SEA
67°00 f
CARIBBEAN 
SEA
66°00' 
65°00 J
EXPLANATION
 1 
OBSERVATION WELL
R«4 
RECORDING WELL
  RAINFALL STATION
18°00'
LANDS
8T. CROIX
Figure 1. Location of ground-water, rainfall stations and location map.
GROUND-WATER RECORDS FOR ST. CROIX, 
U.S. VIRGIN ISLANDS, 1969-73 
Purpose and Scope - Continued
In 1967* in cooperation with the Water Resources Research Institute of 
the Caribbean Research Institute/ Collage of the U.S. Virgin Islands* the 
U.S. Geological Survey initiated ? project to collect ground-water data 
in St, Croix. 
The purpose of the project was to obtain baseline water- 
level data at selected malls throughout the island. 
Ground-water levels 
are necessary for future studies of tha ground-watar resources in St. 
Croix and to assist in the management and pumpaga-optimization of 
axisting well fields.
Climate of St. Croix
Precipitation over St, Croix avaragas 40 inches per year (figure 2)* 
with a range from 30 to 50 inches (Jordan* 1°75). 
Most of the rain 
occurs from May to Saptember* although frequent droughts can occur during 
any period of the year. 
January to March are the driest months. 
Rainfall 
effects on the recharge of the aquifers in St. Croix have not been da- 
fined. 
The data in this report includes rainfall at selected National 
 (leather Service Stations that could be related to ground-water levels.
COLLECTION OF GROUND-WATER DATA
Watej level date presented in this report were obtained from a net- 
aork of observation uiells oparatad by tha U.S. Geological Survay* Water 
Resources Division* in St. Croix. 
The walls are located at the most 
important aquifers throughout .tha island. 
Watar levals are reported frou 
six (6) observation uiells* of which four (4) wara aquioped with automatic-
1963
1964
0 
12345 
I 
I 
II 
I 
I
10 MILES
Figure 2. Rainfall distribution, in inches on St. Croix for 1963, 
1964, and average-annual precipitation, 1918-67 
(Modified from Jordan, 1975).
GROUND-WATER RECORDS FOR ST. CROIX, 
U.S. VIRGIN ISLANDS, 1969-73
COLLECTION OF GROUND-WATER DATA - Continued
continuous racorders. 
At the two other wells* water levels were measured
about monthly as instantaneous values.
Water-level measurements are given in feet referenced to a land sur- 
face datura (Isd). The land-surface datum is approximately equal to the land 
elevation in the vicinity o* the w-all. 
A measuring point is also shown for 
each well* also relative to the Isd. 
In some of the wells* a measuring 
soint higher than the Isd is used.
At walls equipped with recorders* the nean-daily water level is shown. 
This contrasts with prior publications (ftobison* T,M.* 1973)* where only every 
fifth day is shown. 
At non-reco«~d ing wells the instantaneous values deter  
.nined during the indicated day sre shown.
Water levels are reported to the nearest hundredth of a foot (0.01 ft). 
Periods of missing record at the walls equipped j/ith recorders are shown 
blank. 
A well description precedes each tabla of d?ta. 
Included are gen- 
eral characteristics of th<? veil, location* aquifer formation* datum to 
which elevations are referenced* and the period of racord.
Additional information on wells and tha data published in this report 
nay oe available from the San Juan office of the U.S, Geological Survey* 
Caribbaan District.
REFERENCES
Jordan^ Donald G.* 1?75^ A survey of the water rasources of St. Croix^
U. S. Virgin Islands: U.S. Geological Survey Open-file Reports 
51 p.
Tully M.* and others/- 1973/- Water records of the U.S. Virgin 
Islands : U.S. Geological Survey Oata Report^ 163 p.
5
APPENDIX 1. WATER LEVELS AT MAHOGANY WELL
USGS NUMBER.  174336064523200. Local number 17.
LOCATION.  Lat 17 43' 36", Long 64 52' 32".
OWNER.  U.S. Virgin Islands Government.
NAME.  Mahogany Road 3 a/ell.
AQUIFER.-- Alluvium of quaternary age and volcanic rock of cretaceous age.
WELL CHARACTERISTICS.  Drilled unused water table, diameter 6-in cased
0-104 ft, perforated 64-104 ft. Depth 104 ft. 
DATUM.  Altitude of Isd is 70 ft above mean sea level. 
MEASURING POINT.  Top of 6-in casing, which is 3.6 ft above Isd. 
REMARKS.  Recording observation well. Affected by nearby pumpage. 
PERIOD OF RECORD.  Water levels: 1964-7^ Cdiscontinuedl. 
EXTREMES FOR PERIOD OF RECORD.  Highest water level 26.24 ft below Isd,
Dec. 16, 1969; lowest water level 74.31 ft below Isd, Mar. 29, 1965.
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, ON 5TH, 10TH, 15TH, 20TH, 25TH, AND LAST DAY OF MONTH
CALENDAR YEAR JANUARY 1969 TO DECEMBER 1969
Day 
Jan.
Feb.
Mar,
5
10
15
20
25
eom
72.71
72.75
72.76
72.94
72.83
72.89
72.92
72.89
72.91
72.87
72.88
72.98
72.88
72.79
  
72.71
72.67
72.65
Apr. 
May 
June 
July 
Aug.
72.69 
   
   
   
39.89
   
   
57.18 
   
40.55
70.38 
   
   
   
42.26
   
   
   
39.88 42.95
   
   
   
39.26 43.66
Sep.
Oct.
Nov
Dec
44.22
44.77
50.60
45.92
46.25
46.57
46.34
  
-
45.35
46.73
46.45
45.96
45.54
45.05
46.89
43.32
35.20
30.86
27.19
  
26.29
26.85
27.76
29.37
Continued
APPENDIX 1. - Continued
MEAN-DAILY-WATER LEVEL IN FEET BELOW LAND-SURFACE DATUM 
CALENDAR YEAR JANUARY 1970 TO DECEMBER 1970
Day 
Jan.. 
Feb. 
Mar. 
Apr. 
May 
June 
July 
Aug. 
Sep. 
Oct. 
Nov. 
Dec.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1 7
13
19
20
21
22
23
24
25
26
27
23
29
30
31
29.32
30.09
30.39
30.69
30.97
31.25
31.54
31.80
32.05
32.32
32.59
32.35
33.11
33.37
33.62
33.85
34.06
34.24
34.43
34.59
34.76
34.94
35.07
35.27
35.43
35.57
35.72
35.38
36.03
36.19
36.33
36.53
36.64
36.80
36.95
37.09
37.26
37.42
37.57
37.74
37.93
38.07
33.26
38.43
38.59
38.79
38.97
39.11
39.27
39.43
39.66
39.83
39.99
40.16
40.32
40.47
40.62
40.79
40.95
  
  
41.13
41.31
41.45
41.61
41.30
41.92
42.06
42.23
42.40
42.57
42.74
42.91
43.06
43.22
43.40
43.36
44.04
44.20
44.38
44.56
44.74
44.91
45.07
45.24
45.43
45.62
45.30
45.97
46.14
46.31
46.50
46.67
46.37
47.04
47.20
47.41
47.59
47.77
47.95
48.12
43.29
48.47
48.62
48.31
48.98
49.18
49.30
49.45
49.65
49.35
50.02
50.18
50.35
50.51
50.69
50.87
51.05
51.23
51.40
51.56
51.72
51.88
52.03
51.96
52.28
52.43
52.57
52.70
51.80
52.99
53.08
53.01
52.87
52.82
52.71
52.54
52.38
52.22
52.10
51.91
51.70
51.49
51.28
51.10
50.91
50.71
50.52
50.34
50.17
49.98
4^.79
49.58
4<*.42
49.28
49.06
43.91
48.71
43.52
43.40
43.18
43.00
47.84
47.67
47.51
47.33
47.18
46,90
46.65
46.35
46.05
45.30
45.50
45.25
44.95
44.70
44.40
44.14
43.92
43.61
43.30
43.00
42.73
42.43
42.15
41.86
41.55
41.30
  
  
  
  
-    
.
  
  
  
-
  
  
   
.
  
  
  
- 
  
  
  
  -
  
  
  
  
  
-
  
  
  
  
- 
36.25
36.28
36.30
36.33
36.36
36.41
36.47
36.53
36.58
36,66
36.76
36.85
36.95
37.07
37.16
37.27
37.38
37.49
37.60
37.71
37.35
37.99
33.11
38.25
33.38
38.52
33.69
39.83
39.96
40,11
40.27
40.44
40.60
40.76
40.92
41.08
41.19
41.35
41.50
41.63
41.76
41.89
42.02
42.15
42.29
42.44
42.57
42.67
41.00
41.94
42.03
42.22
42.35
42.51
42.65
42.73
  
Continued
MEAN-DAILY-WATER LEVEL IN FEET BELOH LAND-SURFACE DATUM 
CALENDAR YEAR JANUARY 1972 TO DECEMBER 1972
Mar. 
Apr. 
May 
June 
July 
Aug. 
Sep.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1 5
16
17
13
19
20
21
22
23
24
25
26
27
23
29
30
31
62.38
62.82
62.73
62.77
62.60
62.52
62.44
62.37
62.25
62.15
61.07
61.97
61.33
61.77
61.62
61.40
61.38
61.27
61.17
60.06
60.95
60.37
60.70
60.48
60.24
59.99
59.75
59.53
59.32
59.03
58.70
58.61
58.52
53.44
58.37
53,29
53.22
58.15
58.08
58.01
53.96
53.91
5.3.33
53.34
53.32
58.79
58.75
58.72
53.70
53.67
53.65
58,64
53.62
53.60
53.60
53.60
58.61
58.60
53.60
53.60
0.00
0.00
57.58
57.58
57.64
57.64
57.64
57.57
57.69
57.71
57.73
57.76
57.79
57.83
57.88
57.92
57. 95
57.98
53.02
53.07
53.12
53.17
53.21
53.25
58.30
58.34
53.38
53.42
53.45
53.48
53.53
53.58
58.61
58.66
58.70
58.72
58.77
58.32
58.35
58.88
58.92
53.96
58.99
58.85
58.98
59.09
59.11
5^9 1 3
59.15
59.16
59.17
59.20
59.19
59.20
59.21
59.17
59.20
59.19
59.18
59.18
59.17
59.15
59.14
0.00
59.12
59.11
59.10
59.07
59.06
59.05
59.00
59.00
58.95
58.95
58.90
53.90
58.85
53.35
58.80
58.30
53.75
53.75
58.70
58.70
53.65
58.65
5S.60
53.60
53.55
53.55
53.50
53.50
58.45
58.45
53.42
58.41
58.42
53.42
58.43
53.44
53.46
53.48
53.50
58.55
53.58
53.62
53.67
53.71
53.76
S|3 
5C
58.35
53.90
58.96
59.04
59.12
59.19
59.27
59.35
59.42
59.48
59.59
59.69
59.78
59.34
59.94
0.00
60.04
60.11
60.16
60.25
60.40
60.45
60.56
60.66
60,75
60.86
60.95
61.08
61.19
61.29
£4_t»_3-8_
61.49
61.59
61,69
61.79
61.88
61.97
62.07
62.14
62.23
61.32
61.39
61.45
61.54
61.61
61.68
62.75
62.77
62.85
62.90
62.97
63.03
63.09
63.16
63.21
63.27
63.33
63.33
63.44
63.50
63.55
63.60
  V -J   w W
63.66
63.72
63.77
63.82
63.38
63.94
63.99
64.05
64.11
64.16
64.21
64.27
64.32
64.37
64.42
64.48
64.56
64.65
64.57
64.73
64.36
64.93
64.99
65.16
65.15
65.22
65.31
65.37
65.45
65.51
65 58
v J m J w
65.67
65.72
65.81
65.38
65.96
66.03
66.09
66.16
66.21
66.28
66.35
66.42
66.47
66.55
66.61
0.00
66.66
66.76
66.25
66.76
66.38
66.92
66.96
67.00
67.03
66.92
67.06
67.12
67.15
67.19
67« 23
67.27
67.15
67.31
67.34
67.38
67.43
67.47
67.50
67.54
67.58
67.62
67.65
67.67
67.69
67.72
67.75
67.78
67.82
67.83
67.84
67.86
67.89
67.91
67.94
67.96
67.99
63.02
68.05
68.07
68.11
_ &8»^4
68.17
68.19
68.21
63.24
68.26
68.29
63.32
68.34
63.37
68.41
63.44
68.47
68.50
68.54
68.57
0.00
68.60
68.64
68.67
68.70
68.70
68.75
68.75
68.75
63.30
68.80
68.80
68.85
68.90
68.90
'68^90^
63.90
68.90
68.90
63.35
68.85
63.85
68.85
68.80
63.30
68.80
68.75
68.75
63.75
63.70
68.70
63.65
APPENDIX 1. - Continued
MEAN-9AILY-WATER LEVEL IN FEET BELOW LAND-SURFACE DATUM 
CALENDAR YEAR JANUARY 1973 TO DECEMBER 1973
Day 
Jan. 
Feb. 
Mar. 
Apr. 
May 
June 
July 
Aug. 
Sep.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
13
19
20
21
22
23
24
25
26
27
28
29
30
31
63.60
68.57
68.53
68.48
63.48
68.48
68.48
68.48
68.48
63.49
68.50
68.51
68.52
63.52
68.63
68.54
68.56
68.58
68.59
63.60
68.61
68.62
63.63
68.64
63.66
68.66
63.67
68.68
63.68
63.69
68.70
68.70
68.70
68.70
68.70
68.71
68.72
68.72
68.72
68.73
68.73
68.73
68.74
68.74
68.74
68.75
63.76
68.77
68.77
68.77
63.77
68.77
63.77
68.77
63.78
68.78
63,79
68.30
68.82
  
  
  
63.32
68.84
63.84
68.85
68.35
68.85
63.90
68.90
68.90
63.90
68.95
63.95
68.95
68.95
69.00
67.00
69.00
69.00
69.00
69.05
69.05
69.05
69.10
69.10
69.10
69.10
69.10
69.15
69.15
69.15
69.15
69.20
69.20
69.19
69.19
69.21
69.23
69.26
69.27
69.29
69.31
69.32
69.33
69.33
69.33
69.35
69.36
69.36
69.38
c9.41
69.42
69.43
69.45
69.45
6?.46
69.46
69.49
69.50
69.52
69.54
69.54
  
69.55
69.56
69.56
69.57
69.58
69.60
69.62
69.63
69.64
69.64
69.65
69.65
69.65
69.65
69.65
69.65
69.64
69.64
69.64
69.64
69.64
69.64
69.64
69.64
69.64
69.64
69.64
69.64
69.64
69.64
69.64
69.65
69.65
69.65
69.65
69.65
69.65
69.66
69.67
69.68
69.69
69.64
69.69
69.66
69.70
69.70
69.71
69.70
69.69
69.68
69.67
69.67
69.56
69.66
69.66
69.68
69.71
69.74
69.77
69.79
69.31
  
69.34
69.87
69.90
69.93
69.98
70.00
70.03
70.05
70.08
70.10
70.13
70.15
70.18
70.20
70.23
70.24
70.24
70.24
70.25
70.25
70.26
70.26
70.26
70.26
70.25
70.24
70.23
70.22
70.22
70.22
70.22
70.24
70.25
70.24
70.24
70.24
70.24
70.24
70.25
70.25
70.25
70.25
70.25
70.24
70.14
70.21
70.21
70.21
70.21
70 r 21
70.22
70.23
70.25
70.27
70.28
70.29
70.30
70.32
70.33
70.34
70.36
70.37
70.28
70.36
70.36
70.36
70.36
70.34
70.35
70.37
70.30
70.37
70.37
70.37
70.38
70.38
70.28
70.38
70.40
70.42
70.42
70.42
70.42
70.42
70,42
70.42
70.32
70.36
70.38
70.40
70.30
70.38
  
70.33
70.36
70.37
70.37
70.37
70.37
70.36
70.36
70.36
70.36
70.35
70.14
70.18
70.31
70.29
70.32
70.33
70.34
70.24
70.33
70.32
70.32
70.28
70.27
70.27
70.24
70.21
70.19
70.17
70.15
70.16
70.15
70.15
70.15
70.14
70.14
70.12
70.13
70.13
70.13
70.14
70.13
70.13
70.13
70.14
70.14
70.15
70.15
70.16
70.16
70.17
70.18
70.20
70.21
70,22
70.24
70.25
70.28
70.29
70.31
70.32
  
-
70.34
70.35
70.36
70.38
70.39
70.39
70.42
70.45
70.48
70.51
70.55
70.59
70.61
70.63
70.65
70.67
70.68
70.69
70.70
70.73
70.75
70.77
70.79
70.81
70.84
70.85
70.88
70.90
70.92
70.94
70.95
MEAN-DAILY-WATER LEVEL IN FEET BELOW LAND-SURFACE DATUM 
CALENDAR YEAR JANUARY 1971 
TO DECEMBER 1971
Day 
Jan
Feb. 
Mar. 
Apr. 
May 
June 
July 
Aug. 
Sep.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
  
, 
, 
, 
  
   
, 
. 
  
  
. 
,  
.
    -
.__
.«.
  
  
, 
, 
, 
, 
, 
.   
, 
, 
, 
. 
. 
53.98
54.03
54.11
54.20
54.35
54.40
54.50
54.58
54.68
54.79
54.90
55.00
55.11
55.20
55.32
55.TO
55.49
55.57
55.67
55.76
55.87
55.95
56.03
56.10
56.20
56.28
56.37
56.45
56.53
56.60
56.70
56.78
56.38
56.96
57.05
57.20
57.28
57.35
57.43
57.52
57.60
57.72
57.80
57.88
58.00
58.05
T8VR^
58.24
58.31
53.40
58.48
58.58
53.68
53.78
58.85
53.95
59.08
59.18
59.29
59.38
59.47
59.57
59.68
59.81
59.81
59.98
60.08
60.16
60.24
60.34
60.41
60.49
60.57
60.64
60.74
60.82
60.90
^5.9^
61.04
61.12
61.20
61.28
61.36
61.42
61.48
61.55
61.63
61.68
61.75
61.83
61.90
61.98
  
-
62.04
62.10
62.17
62.22
62.27
62.33
62.37
62.39
62.49
62.50
62.54
62.59
62.63
62.68
62.72
62.75
62.78
62.83
62.36
62.89
62.91
62.96
63.00
63.04
63.09
63.13
63.18
63.23
63.33
63.34
63.35
63.36
63.29
63.38
63.39
63.40
63.40
63.40
63.49
63.41
63.67
63.64
63.65
63.66
63.68
63.69
63.70
63.71
63.75
63.30
63.81
63.82
63.33
63.83
63.84
63.35
63.86
63.36
63.36
63.36
63.36
  
63.87
63.87
63.86
63.36
63.86
63.86
63.86
63.86
63.85
63.33
63.81
63.80
63.78
63.75
63.75
63. 7T
63.69
63.66
63.65
63.61
63.56
63.51
63.48
63.25
63.31
63.29
63.26
63.20
63.08
62.98
62.90
Continued
RAINFALL. IN INCHES
OB 
O
WATER LEVEL. IN FEET BELOW 
LAND-SURFACE DATUM
-* 
-* 
to
O 
01 
O 
01 
O
Mar.        
Apr. 
NO IU|1 A 
S
July         
Jan. "   
Feb. "
Mar. "
Apr. ' " 
May ......    ..    ..............
Nov. '- " -      ---   
Jan. ' " 
Feb. 
'     "  
Mar. " "  
T
Apr. 
 "   -  
June ' 
July '  
Sept. '         -  
Oct. ' -     -      
Nov. '    --  
T
Dec. 
l     --    
Feb. 
'   
""'
Mar. 
'     '     ""
Apr.   "   '
May ""
June ' -    
July '"
Aug. '""" '
Dec. ' "   ""   "   
^
Feb. "'
Mar. """
Apr. '  '
May "
June
Aug. 
' " " " " " " "
Oct.  "       
Nov. '"
X 
A 
Ol 
«. 
Q 
fO 
O 
O 
O 
O 
O 
O
TP
> 
i!. r ._...._._.._......_.._.....__......
..._..-___... ... r .......__........._-.._...-_.-... -
........... ...t: ...................................
....... .......i2... .......... ..^. .................
*
........................ ^.. ........................
* \
"" *     u .
\
.
.* ''
;;," "
...................^-.....T..................
S 
O
* N ^*. 
O
............  .......  
-+*^-- >t.-. ...............
H
....-......._...._._..._.--._-........._.......
t
.. ______ ------_---. .I'rt--   -----------------------
c>
0
.............. .....^.. .........................
_: _-_-_  __-_.__ ^ _______________________
>
f
------^-- ----------
 if 
" ----- ------- ----------- ------
L_ 
j
^ 
|
s 
I
^ '  !
II~n
ly
^rii
JI
X
^'T
) 
. ..................
iT
1
1
flIT
B I
f
fl
Tl
Oc
^1 
O
CO
09
O 
IQ
3 
Q.
<0
01 
<0
5, 
<o
£ 
x^
»* 
»
r+o"
3 
fl»
r+
CO
<0^
10
CD^ 
c»
N>
APPENDIX 2. WATER LEVELS AT AIRPORT WELL
USGS NUMBER.  174159064481900. Local number 13.
LOCATION.-- Lat 17 41' 59"* Ion 64 43* 19".
OWNER.  U.S. Virgin Islands Government.
NAME.  Airport 39 well.
AQUIFER.  Marl and limestone of Tertiary Age.
WELL CHARACTERISTICS.  Drilled unused mater table wall* diameter 3-in* cased
0-110 ft, perforated 53-110 ft. Depth 110 ft. 
OATUM.  Altitude of Isd is 35 ft above mean saa level. 
MEASURING "OINT.  Top of 8~in casing* which is 1.7 ft above Isd. 
REMARKS.  Recording observation well.
PERIOD OF RECORD.-- Water levels: 1962-73 Cdiscontinuedl. 
EXTREMES FOR PERIOD OF RECORD.  Highest water level 29.30 ft below 
Nov. 16* 1962; lowest water level 36.63 ft below Isd* June 27* 1962
LOWEST WATER LEVEL IN FEET BELOW LAND-SURFACE*OATUM* ON 5TH* 10TH* 15TM* 20TM* 25TH* AND LAST DAY OF MONTH
CALENDAR YEAR JANUARY 1969 TO DECEMBER 1969
Day
5
10
20
25
eom
Jan.
Feb.
Mar,
Apr.
31.47 
31.45
 X4 
TO
31.42 
31.46 
31.49
31.55 
31.55 
31.56
31.55 
31.58
31.49 
31.47
31.63 
31.65 
31.66
31.66 
31.71 
31.73-- 
31.74
May
June
July
Aug.
Sep.
31.19
  
31 «20
31.14
29.85
29.88
30.23
30.37
30.53
30.60
30.66
30.72
30.76
-.-.«
.__  
«,-« . ,. __
  
30.83
30.82
30.04
30.88
30.83
30.82
30.84
30.83
30.85
30.90
  3-Q~.~T-2~
30.89
   
,
  
Oct.
Nov
Dec
  
30.65 
20.62 
30.65
30.66 
30.66 
30.67
30.57
30.50
30.57 
30.57 
30.57 
30.58 
30.61 
30.62
Day
5
10 
15 
20 
25 
eom
Continued
Jan,
Feb.
CALENDAR YEAR JANUARY 1970 TO DECEMBER 1970 
Mar. 
Apr. 
May 
June 
July 
Aug. 
Sep.
30.66
30.65
30.61
30.68
30.71
30.72
30.71
30.63
30.63
30.96
30.96
30.98
31.05
31.06
31.10
30.85
30.83
30.89
30.89
30.89
30.91
30.91
30.95
30.94
30.85
30.83
30.79
30.80
30.86
30.92
30.91
30.92
30.88
30.79
30.77
30.75
30.75
30.69
30.68
30.48
30.45
  
30.44
30.43
30,43
30.42
30.42
  
Oct,
Nov.
Dec.
APPENDIX 2. - Continued
MEAN-DAILY-WATER LEVEL IN FEET BELOW LAND-SURFACE DATUM 
CALENDAR YEAR JANUARY 1971 
TO DECEMBER 1971
Day 
Jan,
July
Sep
1
2
3
4
5
6
7
3
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
29.36
29.38
29.39
29.40
29.42
29.44
29.47
29.50
29.53
29.56
29.58
29.60
29.62
29.63
29.64
29.65
29.67
29.69
29.70
29.71
29.73
29.75
29.76
29.76
29.78
29.79
29.80
29.82
29.83
29.83
29.84
29.85
29.36
29.87
29.88
29.89
29.90
29.91
29.92
29.93
29.94
29.95
29.96
29.96
29.97
29.97
29.98
29.99
30.01
30.01
30.02
30.02
30.03
30.03
30.03
30.03
30.03
30.01
29.99
  
-
  
  
29.98
30.00
30.02
30.03
30.03
30.03
30.03
30.03
30.03
30.03
30.03
30.03
30.03
30.03
30.03
30.03
30.04
30.05
30.06
30.07
30.07
30.07
30.08
30.09
30.09
30.10
30.10
30.10
30.10
30.10
30.12
30.13
30.12
30.12
30.11
30.12
30.11
30.11
30.10
30.10
30.10
30.10
30.11
30.12
30.13
30.13
30.13
30.14
30.14
30.15
30.16
30.17
30.18
30.19
30.20
30.20
30.21
30.22
30.22
30.22
30.23
  
30.23
30.23
30.22
30.22
30.23
30.24
30.24
30.25
30.26
30.27
30.28
30.28
30.28
30.28
30.27
30.27
30.26
30,26
30.25
30.24
30.23
30.23
30.23
30.22
30.21
30.20
30.20
30.19
30.19
30.19
30.18
30.18
30.17
30.18
30.17
30.17
30.16
30.16
30.16
30.17
30.19
30.20
30.19
30.19
30.19
30.19
30.19
30.18
30.19
30.20
30.21
30.23
30.23
30.24
30.25
30.26
30.26
30.26
33.25
30.25
30.25
  
30.26
30,27
3D. 27
30.28
30.29
30.29
30.30
30.30
30.31
30.32
30.32
30.33
30.33
30.34
30.34
30.35
30.35
30.36
30.36
30.37
30.38
30.38
30.39
30.39
30.40
30.40
30.41
30.42
30.42
30.43
30.44
30.44
30.44
30.45
30.45
30.45
30,46
30.46
30.46
30.46
30.45
30.44
30.44
30.43
30.43
30.44
30.45
30.45
3Q.44
30.43
30.42
30.41
30J39
30.38
30.37
30.36
30.34
30.33
30.33
30,32
30.31
30.29
30.28
30.25
50.22
3'0.19
SO. 16
^30.14
30.13
30.12
30.11
30.11
30.12
30.12
30.12
30.12
30.13
30.13
30.13
30.12
30.13
30.13
30.14
30.14
30.15
30.16
30.16
30.17
30.17
30.17
30.17
30.18
  
30.18
30.16
30.16
30.15
30.14
30.13
30.13
30.13
30.13
30.13
30.14
30.14
30.14
30.14
30.13
30.11
30.09
30.07
30.05
30.04
30.03
30.01
29.93
29.84
29.74
29.67
29.62
29.58
29.64
29.63
29.63
29.62
29.62
29.63
29.64
29.65
29.67
29.68
29.69
29.71
29.72
29.73
29.74
29.75
29.76
29.77
29.77
29.68
29.67
29.68
29.69
29.71
29.71
29.72
29.72
29.73
29.72
29.72
29.71
29.71
29.72
  
29.72
29.72
29.73
29.74
29.76
29.77
29.78
29.79
29.79
29.80
29.82
29.83
29.83
29.84
29.84
29.87
29.90
29.92
29.95
29.97
29.98
29.98
29.97
29.96
29.93
29.92
29.91
29.91
29.92
29.94
29.95
MEAN-DAILY-WATER LEVEL IN FEET BELOH LAND-SURFACE DATUM 
CALENDAR YEAR JANUARY 1972 TO DECEMBER 1972
Mar. 
Apr. 
May 
Juna 
July 
Aug. 
Sep.
1
2
3
4
5
6
7
3
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
29.97
29.98
30.00
30.01
30.02
30.02
30.03
30.04
30.06
30.07
30.09
30.10
30.11
30.12
30.11
30.10
30.09
30.07
30.06
30.05
30.05
30.05
30.05
30.06
30.07
30.07
30.09
30.09
30.11
30.11
30.11
30.12
30.12
30.12
30.12
30.13
30.14
30.14
30.15
30.16
30.16
30.17
30.18
30.18
30.18
30.18
"^ n 1 R
30.18
30.19
30.20
30.21
30.23
30.24
30.26
30.27
30.28
30.30
30.30
39.28
30.27
  
  
30.27
30.24
30.21
30.18
30.17
30.16
30.16
30.17
30.18
30.19
30.19
30.19
30.19
30.19
30.19
30.19
30.19
30.19
30.19
30.19
30.19
30.20
30.19
30.18
30.17
30.16
30.16
30.15
30.15
30.14
30.14
30.14
30.14
30.16
30.18
30.20
30.21
30.22
30.22
30.23
30.23
30.23
30.22
30.22
30.22
30.22
30.2^
30.23
30.24
30.25
30.26
30.26
30.27
30.27
30.26
30.26
30.26
30.26
30.26
30.26
30.26
  
30.27
30.27
30.28
30.29
30.30
30.30
30.31
30.31
30.3-1
30.32
30.32
30.33
30.33
30.34
30.34
30 "55
J W   J  *
30.36
30.36
30.36
30.36
30.36
30.36
30.38
30.40
30.40
30.41
30.41
30.41
30.41
30.42
30.42
30.42
30.42
30.42
30.42
30.40
30.40
30.19
30.39
30.39
30.39
30.39
30.39
30.39
30.39
30.39
10.40
30.40
30.41
30.42
30.42
30.43
30.43
30.44
30.45
30.46
30.47
30.48
30.49
30.50
30.50
  -
30.48
30.46
30.44
30.43
30.42
30.42
30.41
30.41
30.42
30.42
30.43
30.44
30.44
30.44
30.44
30.43
30.43
30.43
30.43
30.44
30.45
30.46
30.46
30.46
30.47
30.48
30.48
30.48
30.49
30.50
30.50
30.48
30.44
30.45
30.46
30.46
30.46
30.46
30.47
30.47
30.47
30.46
30.46
30.45
30.44
30.43
30*44
30.44
30.45
30.45
30.46
30.46
30.46
30.46
30.46
30.46
30.45
33.44
30.44
30.44
30.45
30.46
30.48
30.47
30.46
30.44
30.41
30.40
30.39
30.38
30.38
30.37
30.37
30.38
30,38
30.39
30.39
30.39
30.40
30.40
30.40
30.40
30.40
30.39
30.39
30.38
30.38
30.38
30.38
30.38
30.37
30.37
  
30.37
30.37
30.37
30.36
30.34
30.32
30.31
30.30
30.30
30.30
30.30
30.30
30.32
30.32
30.34
30.34
30.35
30.36
30.36
30.36
30.35
30.35
30.36
30.36
30.37
30.38
30.39
30.40
30.40
30.38
30.36
30.35
30.34
30.30
30.30
30.31
30.31
30.33
30.34
30.36
30.37
30.38
30.40
30.40
30.41
30.41
 9 n / o
30.41
30.42
30.43
30.44
30.45
30.47
30.48
30.50
30.51
30.52
30.54
30.55
30.56
30.56
   
.
30.57
30.58
30.60
30.60
30.59
30.58
30.58
30.57
30.55
30.52
30.49
30.44
30.41
30.38
30.36
TQ Jit
30.33
30.32
30.31
30.31
30.31
30.31
30.30
30.30
30.31
30.30
30.30
30.31
30.31
30.31
30.32
APPENDIX 2. - Continued
MEAN-DAILY-WATER LEVEL IN FEET BELOW LAND-SURFACE DATUM 
	CALENDAR YEAR JANUARY 1973 TO DECEMBER 1973
	Feb. 
Mar. 
Apr. 
May 
June 
July 
Aug. 
Sep. 
Oct
1 
30.32 
30.52 
30.72 
30.33 
   
   
31.02 
31.00 
31.04 
  
2 
30.33 
30.53 
30.72 
30.32 
   
30.38 
31.03 
30.99 
30.05 
  
3 
30.33 
30.54 
30.72 
30.81 
   
30.33 
31.03 
30,99 
31.06 
  
4 
30.34 
30.55 
30.73 
30.82 
   
30.39 
31.03 
30.98 
31.07 
  
5 
30.35 
30.55 
30.73 
30.32 
   
30.39 
31.03 
30.98 
31.08 
  
6 
30.36 
30.56 
30.73 
30.83 
   
30. ?Q 
31.03 
30.99 
   
  
7 
30.37 
30.56 
30.73 
30.34 
   
30.91 
31.03 
30.99 
   
  
3 
30.38 
30.56 
30.73 
30.35 
   
30.91 
31.04 
31.00 
   
  
9 
30.39 
30.55 
30.74 
30.85 
   
30.91 
31.05 
31.01 
   
  
10 
30.39 
30.55 
30.74 
30.86 
   
30.92 
31.07 
31.01 
   
  
11 
30.38 
30.55 
30.75 
30.86 
   
30.92 
31.08 
31.02 
   
  
12 
30.38 
30.55 
30.76 
30.36 
   
30.93 
31.08 
31.01 
   
  
13 
30.39 
30.56 
30.78 
30.87 
   
30.94 
31.10 
31.01 
   
  
14 
30.39 
30.57 
30.78 
30.37 
   
30.94 
31.10 
31,00 
   
  
15 
30.40 
30.57 
30.79 
30.88 
   
30.95 
31.10 
30.98 
   
  
16 
30.41 
30.53 
30.80 
30.38 
   
30.96 
31.09 
30.96 
   
  
17 
30.42 
30.58 
30.80 
30.38 
   
30.96 
31.08 
3Q.94 
   
  
18 
30.42 
30.59 
30.30 
30.88 
   
30.97 
31.07 
33.93 
   
  
19 
30.41 
30.59 
30.80 
30.39 
   
30.97 
31.06 
30.93 
   
  
20 
30.40 
30.60 
30.30 
30.89 
   
30.98 
31.05 
30.94 
   
  
21 
30.41 
30.60 
30.80 
30.89 
   
30.98 
31.05 
30.96 
   
  
22 
30.41 
30.60 
30.80 
30.39 
   
30.99 
31.04 
30.97 
   
  
23 
30.42 
30.60 
30.80 
30.39 
   
30.99 
31.03 
30.98 
   
  
24 
30.42 
30.60 
30.80 
30.89 
   
30.99 
31.02 
30.98 
   
  
25 
30.43 
30.60 
30.82 
30.88 
   
30.99 
31.02 
30.99 
   
  
26 
30.44 
30.60 
30.83 
30.38 
   
31.00 
31.02 
31.00 
   
  
27 
30.46 
30.60 
30.33 
30.87 
   
31.00 
31.03 
31.00 
   
  
28 
30.47 
30.61 
30.84 
30.86 
   
31.00 
31.03 
31.01 
   
  
29 
30.48 
   
30.84 
30.86 
   
31.01 
31.03 
31.02 
   
  
30 
30.49 
   
30.84 
30.85 
   
31.02 
31.02 
31.03 
   
  
31 
30.51 
   
30.84 
   
   
   
31.01 
31.04
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RAINFALL. IN INCHES
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10 
»
o 
01 
o 
01 
o 
c
Feb.     
Apr. ""'
June T
July '    " 
'
i
Aug. TT
Oct. 
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1 
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Nov. "   
 --}-  --"j-
Dec.  ""'
Jan. '  '
Feb. '
Mar. '
Apr.
June 
T
July 
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1
Aug. 
, 
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,
i 
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Dec. T 
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. 
_ 
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_ 
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Mar. f"
Apr.   "" 
11 
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June ^"
Nov. '    "' 
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Dec.        
Feb.  ""   
Apr.     
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way ::______Jf_I. _______________________ ______
June ' ""' 
I
July      
Aug.
Nov.  " 
j 
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Dec. "T-   "  ' 
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1 
1 
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Feb.  "' 
:
Apr. " 
i
May '"" r T- -^ 
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June """" 
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July ""J.T 
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-(-+-!-
Aug. "5"]J T 
i 
1
Sept. 
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j^
Oct. 
3
Nov. 
JJ
Dec. 
|>>
WATER LEVEL. IN FEET BELOW 
LAND-SURFACE DATUM 
a 
w 
« 
o 
w 
M
M 
10 
-* 
0 
« 
«
T 
  
1
i '
,
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1
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p
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1 
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i j
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1
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1
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I 
X 
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i
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i
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^
F
^
1L 1
APPENDIX 3. WATER LEVELS AT CASTLE COAKLEY WELL
USGS NUMBER.  174339064445100. Local number USGS-46.
LOCATION.  Lat 17 43' 39", long 64 44' 51".
OWNER. U.S. Virgin Islands Government.
NAME.  USGS-46 CCastle Coakleyl.
AQUIFER.  Marl and limestone of Tertiary Aga.
WELL CHARACTERISTICS.  Drilled unused mater-table well, diameter 6-in, cased
0-154 ft, slotted 94-154 ft. Depth 154 ft. 
DATUM. Altitude of Isd is 97 ft aoove mean sea level. 
?4EASURING »OINT.  Top of shelter floor, which is 2.3 ft above Isd. 
REMARKS.  Recording observation well.
PERIOD OF RECORD.  Water levels: 1969-73 Cdiscontinued]. 
EXTREMES FOR PERIOD OF RECORD.  Highest mater level 32.44 ft below Isd,
Jan. 1, 
1971; lowest mater level 90.11 ft belom Isd, May 10, 1969.
LOWEST WATER LEVEL IN FEET BELOW LAND-SURFACE DATUM, ON 5TH, 10TH, 15TH, 20TH, 25TH, AND LAST DAY OF MONTH
CALENDAR YEAR JANUARY 1969 TO DECEMBER 1969
Day 
Jan.
Feb.
Mar.
Apr,
May
June
July
Aug.
5
10
15
20
25
eon
89.95
89.88
89.76
89.74
89.76
89.77
89.81
39.78
89.78
39.80
39.81
89.79
89.83
39.86
  
90.00
39.96
89.93
89.99
90.00
90.01
90.09
  
  
  
-
90.11
90.00
89.71
89.08
88.59
87.34
87.20
37.20
37.26
87.29
87.34
87.35
87.35
  
87.33
87.33
37.36
37.40
87.45
87.43
-  
.
  
-* 
Sep.
88.18
88.16
Oct.
88.10
88.12
88.17
88.00
87.95
87.90
Nov. 
87.99
86.83
Dec.
36.82
86.80
36.78
86.76
86.70
Day
5
10 
15 
20 
25 
 on
Jan,
Feb.
83.70
88.77
88.83
87.39
CALENDAR YEAR JANUARY 1970 TO DECEMBER 1970 
Mar. 
Apr. 
May 
June 
July 
Aug. 
Sep.
88.01
88.70
  
   
.
  
87.54
87.60
87.55
87.49
87.48
87.43
87.39
87.39
87.38
87.39
87.38
87.30
  
  
86.60
86.53
86.55
86.50
86.50
86.47
  
86.54
89.85
90.05
Oct.
Nov.
Dec.
Continued
APPENDIX 3. - Continued
MEAN-DAILY-W4TER LEVEL IN FEET 3ELOW LAND-SURFACE DATUM
CALENDAR YEAR JANUARY 1971 
TO DECEMBER 1971
Day
1
2
3
4
5
6
7
3
9
10
11
12
13
14
15
T6
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Jan.
82.44
82.47
82.48
82.53
82.59
82.63
82.70
82.76
82.78
82.34
82.85
82.91
82.99
83.03
83.04
83.04
83.06
83.10
83.16
83.26
83.24
83.26
83.29
83.33
83.39
83.33
83.44
83.47
83.51
83.53
83.52
Feb.
83.56
83.58
83.60
83.60
83.62
83.68
83.64
83.71
83.72
83.72
83.75
83.76
83.77
83.76
83.77
83.77
83.82
83.82
83.84
83.85
83.84
83.35
83.36
83.86
83.87
83.89
83.90
83.38
  
.-
   -
  
Mar.
83.85
83.36
33.89
83.91
83.91
83.94
83.94
83.93
83.93
83.90
83.39
83.89
83.88
83.38
83.37
83.38
83.90
83.94
83.95
83.94
83.96
83.96
33.95
83.96
83.99
84.01
84.00
84.02
84.05
84.07
84.03
Apr.
84.11
84.12
84.10
84.10
84.08
84.07
34.02
33.98
83.95
83.94
83.92
83.90
83.93
83.94
83.93
83.92
33.94
83.98
83.98
83.98
84.02
84.04
84.07
84.08
84.07
84.10
84.11
84.12
34.16
84.20
  
May
84.19
84.14
84.18
84.18
84.19
84.22
84.23
84.25
84.24
84.24
84.25
84.24
84.22
84.19
84.16
84.13
84.10
84.11
84.18
84.19
84.18
84.13
84.17
84.17
84.15
84.10
84.07
84.07
84.09
84.13
84.09
June
84.08
34.06
84.04
84.00
83.95
83.93
83.92
33,39
83.39
83.38
33.39
83.38
83.36
33.39
33.93
83.90
83.92
83.91
83.91
83,39
B3.39
83.90
33.92
83.95
83.95
83.93
83.92
33.91
33.92
83.95
  
-
July
84.65
84.68
84.71
84.71
34.68
84.63
84.71
84.71
84.71
34.74
84.74
84.73
84.74
84.78
84.30
84.32
84.81
84.79
84.81
84.30
84.77
84.76
84.75
84.75
84.75
84.76
84.77
34.76
84.72
84.74
84.75
Aug.
84.74
84.72
84.72
84.72
84.73
84.73
84.73
84.73
84.72
84.73
84.72
84.75
84.75
84.73
84.71
84.69
84.68
84.69
84.70
84.70
84.72
84.74
84.77
84.74
84.72
84.73
84.77
84.33
84.39
85.01
85.12
Sep.
85.17
85.18
   
.
  
  
  
  
  
  
  
.-
  
   
.
  
  
  
  
  
  
  
  
  
  
  
  
-
  
  
  
  
  
83.52
  
Oct.
83.50
83.50
83.51
83.53
83.57
83.56
83.56
83.56
83.58
83.61
83.61
83.63
83.63
83.62
83.65
83.66
83.65
83.60
83.56
83.51
33.42
83.34
83.32
83.30
83.23
83.16
83.10
83.05
82.97
82.92
82.39
Nov.
82.90
82.90
82.86
82.36
82.35
82.84
82.79
82.75
82.72
82.69
82.66
82.68
82.70
82.68
82.66
82.63
82.65
82.70
82.68
82.67
82.67
82.68
82.69
82.69
82.68
82.66
82.69
82.72
82.70
82.75
  
Dec.
82.79
82.30
82.82
82.82
82.87
82.86
82.38
82.37
82.87
82.89
82.92
82.92
82.91
82.95
83. m
83.01
83.04
83.06
83.08
83.09
83.10
83.10
83.10
83.10
83.11
83.13
83.18
83.20
83.16
83.17
83.14
Continued
APPENDIX 3. - Continued
MEAN-DAILY-WATER LEVEL IN FEET BELOW LAND-SURFACE DATUM 
CALENDAR YEAR JANUARY 1972 TO DECEMBER 1972
Day
1
2
3
4
5
6
7
3
9
10
11
12
13
14
15
16
17
13
19
20
21
22
23
24
25
26
27
28
29
30
31
Jan.
83.16
83.17
33.18
83.21
83.26
33.25
83.26
83.30
83.32
83.32
83.33
83.34
83,33
83.32
83.32
83.32
83.31
83.32
83.35
83.34
83.34
83.34
83.34
83.36
83.37
83.42
33.44
83.46
83.46
83.47
83.46
Feb.
83.45
83.45
83.45
83.45
83.44
83.43
83.41
83.41
83.42
83.43
83.40
83.40
83.40
83.42
83.43
33.44
83.45
83.46
83.47
83.49
83.50
83.52
83.54
83.57
83.63
83.66
83.67
83.65
83.68
  
  
Mar.
83.68
83.68
83.67
83.66
83.63
83.60
83.58
83.56
83.55
83.54
83.52
83.50
83.52
83.53
83.54
33.55
83.57
83.61
83.62
33.59
83.59
83.58
83.56
83.50
83.42
83.33
83.28
83.22
83.17
83.16
83.16
Apr.
83.16
33.14
83.13
83.14
83..17
83.17
83,17
83.19
83.21
83.21
83.22
83.25
83.25
83.26
83.26
83.26
83.26
83.30
83.32
83.33
83.34
83.35
83.36
83.36
83.35
83.36
83.38
83.39
33,39
83.40
  
May
83.40
83.42
83,43
83,52
83.53
83.53
83.53
83.53
83.55
83.59
83.61
83.64
83.68
83.73
83.75
83.75
83.75
83.75
83.76
83.79
83.79
83.30
83.82
83.32
83.84
83.84
83.35
83.86
83.85
83.85
83.85
June
83.36
83.87
83.36
83.84
33.82
83.33
83.33
83.36
83.37
83.38
83.91
83.90
83.^1
83.92
83.92
83.91
83.<»1
83.91
83.92
83.95
83.99
84.05
84.07
84.07
84,05
84.06
34.09
84.10
84,09
84.11
  
July
84.11
84.07
84.06
84.05
84.03
84.03
84.07
84.09
84.10
84.09
84.11
84.11
84.08
84.07
84.07
84.07
84.07
84.09
84.10
84.10
84.11
84.12
84.12
84.11
84.12
84.14
84.14
84.14
84.14
84.14
84.13
Aug.
84,13
84.13
84.14
84.19
84.16
84.13
84.13
84.13
84.12
84.10
84,09
84.04
83.99
84.95
83.92
83.90
83.36
83.86
£3.87
83.87
83.38
83.88
83.38
83.39
83,89
83.83
83.87
83.37
83.38
83.90
83.91
Sep.
83.38
83.84
83.34
83.81
83.79
83.77
83.75
83.72
83.68
83.64
83.59
83.56
83.53
83.50
83.49
83.47
83.46
83.45
83.43
83.40
83.36
83.32
83.29
83,25
83.21
83.17
83.14
83.10
83.07
83.04
  
Oct.
83.04
S3. 04
83.06
83.03
82.99
82.96
82.93
82.90
82.88
82.86
82.80
82.75
82.75
82.77
82.78
82.79
82.32
82.83
82.83
82.83
82.84
82.00
82.38
82.89
82.91
82.93
82.95
82.98
83.00
83.02
83.05
Nov.
83.07
83.09
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
...
  
  
..   
  
  
  
  
  
  
Dec
...
...
...
...  
.
...
..
...
...
...
._,
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
.  .
.  .
...
   ,
Continued
to
° 
APPENDIX 3. - Continued
MEAN-DAILY-WATER LEVEL IN FEET BELOW LAND-SURFACE DATUM 
CALENDAR YEAR JANUARY 1973 TO DECEMBER 1973
Day 
Jan. 
Feb. 
Mar. 
Apr. 
May 
June 
July 
Aug. 
Sep.
1
2
3
4
5
6
7
6
9
10
11
12
13
14
15
16
17
13
19
20
21
22
23
24
25
26
27
28
29
30
31
84.50
   
84.49
   
84.45
   
84.45
   
84.45
   
84.47
84.48
   
84.51
   
84.53
   
84.55
   
84.56
   
84.57
   
84.61
   
84.68
84.71
   
84.73
   
84.75
   
84.77
   
84.80
   
84.32
   
84.33
   
84.34
   
84.35
   
84.87
   
84.39
   
84.91
   
84.92
   
84.94
   
  
   
  
... 
...
85.01
85.31
85.02
85.01
85.02
85.07
85.12
85.15
85.19
85.22
85.23
85.23
85.23
85.23
35.23
35.23
35.23
85.23
85.23
85.24
85.24
85.24
85.24
85.24
85.24
35.24
85.25
85.25
85.26
85.28
85.30
85.31
85.30
35.41
85.43
85.46
85.48
85.48
85.43
85.50
85.51
85.52
85.55
85.57
85.59
85.61
85.62
85,63
85,64
85.64
85.61
85.60
85.61
85.61
85.62
85.62
85.63
85.64
85.65
85.67
35.67
  
-
85.67
85.67
35.68
85.68
35.70
85.71
85.72
85.74
85,76
85.78
85.81
85.72
85.82
85.32
85.81
85.82
85.82
85.82
85.32
85.32
85.80
85.77
35.74
85.72
85.71
85.70
35.70
85.69
85.68
85.63
85.71
85.73
85.73
85.73
85.74
85.74
85.75
85.76
85.77
85.77
35.78
85.79
85.79
85.79
85.78
85.78
85.79
85.81
85.83
85.35
85.88
85. ?0
35.91
85.91
85.92
25.94
85.96
85.99
86.31
85,03
85.04
  
86.05
86.06
86.08
86.06
86.04
86.06
86.03
86.08
86.07
86.03
36.09
86.10
86.10
86.11
86-10
86.09
86.10
86.10
86.11
86.11
86.11
86.12
36.12
86.13
86.14
86.15
86.14
86.19
86.13
86.12
86.11
86.09
86.09
86.08
36.03
86.06
86.03
86.03
36.03
86.03
86.02
86.02
86.01
86.98
86.98
85.95
85.95
85.94
85.92
85.90
85.37
85.38
85.38
85.88
85.37
85.37
85.38
85.37
85.38
85.89
85.70
85.90
85.91
85.90
85.37
85.85
85.82
85.32
85.32
85.31
85.80
85.79
85.79
35.79
85.78
85.75
85.72_
85.73
85.74
85.74
85.74
85.74
85.74
85.72
85.71
85.69
85.68
85.69
85.63
85.68
85.68
85.68
  
85.68
85.67
85.66
85.64
85.64
85.64
85.64
85.63
85.63
  
  
  
  
  
  
  
  .
  
  
  
  
  
...
...
  
-
  
...
  
...
  
. 
  
  
  
85.68
  
  
  
  
  
  
  
  
  
  
...
  
  
  
  
  
  
...
...
  
  
  
  
  
  
  
  
  
  
  
  
85.94
85.95
85.94
85.94
85.94
85.94
85.95
85.95
85,96
85.96
S5. 9 7
85.98
85.98
85.99
86.00
86.00
86.01
85.01
36.02
86.02
36.03
86.04
86.04
86.05
86.05
86.06
86.07
RAINFALL. IN INCHES
WATER LEVEL. IN FEET BELOW 
LAND-SURFACE DATUM
O> 
0» 
» 
OB
-* 
-* 
10 
| 
O 
Ol 
O 
Ol 
O 
<
Jan.  - -- ---  ---"   
Feb.     
Mar.    -  
Apr.  - 
May .........................................
July      -
Aug.  "    
Sept.
Oct.   --  - -       
Dec.          
Jan. '"
Feb. '
Mar. '
Apr.  " 
June
July  '   
Aug.      
Sept.
Oct.    -   -    - 
Nov. .---..---. ---  -
Dec.       -    ---            
Jan.  "'
Feb. '  - 
Mar. '"
Apr.    "'
May         £
June
July 
'
Aug.    -  -  !  
Sept.    -   - -j-   
Oct ...........
Jan.        
Feb.    -   
Mar.        - 
Apr. 
" ' "
May "
July ' " 
Aug.
Sept.   --  
Oct. " -  ""±        
Nov. ' '  
Jan.   -    -  
reo.
Mar.        
Apr. ' 
May  " 
June
JU|y       -
Aug. '"    
Sept. 
| >
Oct. 
, f
Nov. 
I
D«c. 
'
W1 
O 
O> 
0» 
* 
N
T\
T
T
jT/
* *     i
" " * *     .
----------------------j--  -------------------
/^t
' \
*'  
1
Q
--_...-......... r .... B i.. . ....._.._....-.......
s. fei
^- r
<^ '
  >
'
j |
......-_.... .........__.___....S»-- -----  
-----.
  i
t>
> 
* **
-..----......_....-.......__....._..._ -{ ..........
^
' 
- *
D
1   
* s
'
^
?
--------------- --)---
................... ........_...............^.....
'"
>
s
s .
)
..-_..._-..--...---..-- -.__-.......-_.. ,L-,^___
C '
1: r
..-.....-..---.----......-__. ....... r .- j[ .......
4
....................... .........I!..... .........
i
A
1
^
C 
 i 
0>
Ol
0)
O
«
O
o
0
ex
 1 
0
X
3
10
o3
ro 
ro
APPENDIX 4. WATER LEVELS AT ADVENTURE WELL
USGS NUMBER.  174303064484000, Local number 12.
LOCATION,  Lat 17 43' 08", long 64 48' 40".
OWNER.  U.S. Virgin Islands Government.
*JAME.  USGS-38 CEstate Adventur*}.
AQUIFER. Limey sediments of Tertiary and Quaternary Age.
WELL CHARACTERISTICS.  Orilled unused water-table well* diameter 4-in, cased
0-50 ft, perforated 30-50 ft, open hole 50-97 ft Cnour plugged at 46.8 ft3 
DATUM.  Altitude of Isd is 30 ft above mean sea level.
MEASURING POINT.  Top of shelter floor, mhich is about 0.6 ft above Isd. 
REMARKS.  Recorder and observation uiell. Affected by nearby pumpage. 
PERIOD OF RECORD.  Water levels: 1966 - 69, Sept. 1970-73 Cdiscontinuedl. 
EXTREMES FOR PERIOD OF RECORD.  Highest water level 14.40 ft above Isd,
Nov. 29, 1971; lowest mater level , dry Ttsjell plugged at 46.8 ft3.
WATER LEVEL, IN FEET 8ELOW LAND-SURFACE DATUM, SEPTEMBER 1970 TO DECEMBER 1971
INSTANTANEOUS OBSERVATIONS
Date
Sep 
29, 1970
Nov. 
5
Dec. 
1
Oec. 31
Jan. 29, 1971
Feb. 25
a Pulping.
Continued
Water
level
19.80
17.06
18.67
17.11
17.31
17.30
Date
Mar.
Mar.
May
June
Aug.
4, 1971
31
3
3
4
Water
level
21.60
22.04
13.38
a46.57
a44.97
Date
Sept.
Sept.
Oct.
Nov.
Dec.
2, 1971
30^
29
29
30
Water
level
a45.33
a43.37
a43.26
14.40
15.03
APPENDIX 4. - Continued
MEAN-DAILY-WATER LEVEL IN FEET BELOW LAND-SUFACE DATUM 
CALEMDAR YEA* JANUARY 1972 TO DECEMBER 1972
lar« 
Apr. 
May 
June 
July 
Aug. 
Sep. 
Oct,
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
23
29
30
31
15.07
15.11
15.15
15.16
15.19
1S.20
15.21
15.33
15.32
15.36
15.40
15.42
15.42
15.45
15.51
15.50
15.46
15.49
15.42
15.45
15.46
15.47
15.51
15.53
15.53
15.52
15.55
15.58
15.56
15.59
15.55
15.55
15.63
15.70
15.73
15.74
15.78
15.83
15.39
15.93
15.99
16.00
16.05
16.08
16.12
16.15
16.17
16.20
16.25
16.30
16.35
16.39
16.43
16.49
16.52
16.56
16.60
16.25
16.62
16.60
«  
_ __
16.55
16.40
16.21
16.15
16.12
16.12
16.13
16.13
16.16
16.16
16.17
16.20
16.22
16.25
16.30
16.33
16.37
16.40
16.43
16.49
16.51
16.51
16.52
16.52
16.46
16.36
16.63
16.19
16.18
16.19
16.21
16.23
16.27
16.30
16.13
16.37
16.37
16.38
16.42
16.46
16.50
16.51
16.52
16.56
16.59
16.61
16.63
16.70
16.75
16.73
16.31
16.36
16.89
16.93
16.95
17.00
17.03
17.10
17.14
17.20
17.23
     
17.27
17.29
17.35
17. 40
17.45
17.52
17.55
17.63
17.59
17.72
17.79
17. S3
17.87
17.93
17.98
18.03
13.10
17.19
18.27
18.35
13.45
13.52
18.70
18.73
13.76
18.80
18.81
18.83
18.85
13.87
13.90
Continued
ro
CO
23.70
23.66
23.65
23.60
23.30
23.33
22.90
23.22
23.25
23.15
23.03
22.98
22.95
23.00
22.30
22.37
22.90
22.92
22.95
22.96
22.99
23.01
23.02
23.05
23.08
23.10
23.12
23.13
APPENDIX 4. - Continued
MEAN-DAILY-WATER LEVEL IN FEET BELOW LAND-SURFACE DATUM 
CALENDAR YEAR JANUARY 1973 TO DECEMBER 1973
July 
Aug.
1
2
3
4
5
6
7
3
9
10
't1
12
13
   r^r
15
16
17
13
19
20
21
22
23
24
25
26
27
28
29
30
31
23.16
23.20
23.21
23.20
23.15
23.19
23.25
23.24
23.20
23.26
23.28
23.27
22.98
23.26
23.18
23.24
22.98
23.47
23.38
23.39
23.40
23.44
23.46
23.46
23.51
23.53
23.57
23.63
23.69
23.73
23.77
23.80
23.82
23.38
23.90
23.95
23.97
24.11
24.10
24.10
24.11
24.12
24.17
24.18
24.20
24.15
24.14
24.18
24.30
24.30
23.40
23.90
24.22
24.33
24.40
24.41
24.43
24.46
24.55
  
  
  
24.75
24.76
24.77
24.77
24.78
24.81
24.85
24.85
24.90
24.93
24.00
23.30
25.05
24.50
25.01
25.05
25.13
25.15
25.15
25.16
25.21
25.23
25.28
25.30
25.30
25.31
25.33
25.37
25.42
25.46
25.47
25.48
25.50
25.53
25.70
25.71
25.76
25.30
25.85
25.33
25.90
96.00
25.90
25.96
26.00
26.02
26.05
26.09
26.12
26.13
26.20
26.25
26.30
26.30
26.35
26.39
26.42
26.45
26.50
25.80
26.45
  
26.40
  . 
-  
  
  
_.   
  
  
  
25.30
  
  -
   
  
  
  
  -
  
  
  
  
  
  
  
  
-
-.- . 
  
  
  
 ~
27.65
27.75
27.30
27.85
?7.39
27.90
27.94
27.98
27.99
23.05
  
28.10
23.13
23. TT
23.19
23.19
23.20
23.28
23.30
23.34
23.37
28.40
28.42
23.47
28.50
28.51
28.56
28.58
28.60
23.62
  
23.61
28.68
23.63
28.55
23.50
23.55
28.59
28.60
23.65
23.72
28.08
28.76
28.30
2«.ST
23.83
28.88
23.92
29.03
29.22
29.60
30.13
30.22
29.39
30.60
31.00
31.15
31.25
31.43
31.56
31.68
31.75
30.30
  
 _. .
  
  
  
  
    . 
  
23.75
-  
  
___
  
.  
 H   
-   
  
_-_
  
  
  
  
  
  
  
  
  
   
. 
  
   
  
   
  
   
29.79
30.51 
29.80
   
29.80
29.80
   
29.70
   
29.60
   
29.65
   
,. 
   
23.75
   
28.95
   
30.60
   
30.60
   
30.60
   
30.60
   
30.60
   
3   
30.70
   
30.70
   
30.70
30.70
30.70
   
30.72
   
30.75
   
30.75
30.75
   
30.75
30.75
   
30.80
31.00
31.00
31.00
31.00
30.95
31.00
31.02
30.07
31.10
31.15
29.75
31.21
31.23
5O.95
31.08
31.17
31.20
31.20
31.25
31.30
31.30
31.33
31.00
30.82
30.93
31.01
31.12
31.20
31.28
31.38
  
31.50
31.60
31.67
31.70
31.77
31.77
31.78
31.77
31.80
31.82
31.20
31.89
31.90
M.95
31.97
31.99
32.00
32.01
32.03
32.07
32.08
32.10
32.12
32.16
32.18
32.21
32.23
32.26
32.28
32.29
32.36
WATER LEVEL. IN FEET BELOW LAND-SURFACE DATUM
<Oc * 
<D
0)
00
< +
<D *
5"
<
<D
ST
00
<D
3 
« *  
C 
 ^ 
<D
^ 
O
10
APPENDIX 5. WATER LEVELS AT BARREN SPOT WELL
USGS NUMBER.  174316064453800. Local number 8. 
LOCATION.  Lat 17 43* 16", long 64 45* 38". 
OWNER. U.S. Virgin Islands Government. 
MAflE.  Barren Spot 7 well.
AQUIFER.  Limey sediments of Tertiary and Quaternary Age. 
HELL CHARACTERISTICS.  Drilled Water-table production well, 
cased 0-115 ft, perforated 55-115 ft, open hole 115-140
diameter 6-in., 
ft. Depth 140 ft.
DATUM.  Altitude 
1-in hole in
of Isd is 60 ft above mean sea level 
concrete pump base, which is about 1
Measuring 
9 ft above
point: 
Isd.
REMARKS.  Recorder
PERIOD OF RECORD. 
(discontinued). 
EXTREMES FOR PERIOD 
Oct. 22, 1962;
and observation veil.
Water levels: Nov. 1962 to Oct.
1964, Nov. 1970 - 73
OF RECORD.  Highest water level 50.10 ft below Isd, 
lowest water level a67.25 ft below Isd, Dec. 5, 1973.
Date
Nov.
3ec.
Dec.
Jan.
Feb.
Har.
^ar.
May
June
July
Aug.
Sept.
5,
1
31
29,
25
4
31
3
3
1
3
2
Water
lev el
1970 
59.38
a65.59
a64.45
1971 a64.91
a62.35
a62.35
a63.41
a63.38
a62.25
a57.32
a61.10
a61.15
WATER LEVEL, IN FEET 3ELOW LAND-SUFACE DATUM, NOVEMBER 1970 TO DECEMBER 1973
OBSERVATIONS
Water 
level
Date
Nov. 29,
Dec. 30
Feb. 
1,
Feb. 29,
May 
1
May 
31
June 30
Aug. 
1
Sept. 1
Oct. 
3
Nov. 
2
Dec. 
4
1971 a64.90
a64.54
1972 a64.65
1972 a64.-18
a66.17
a5°.01
a63.80
a63.70
a67.13
a63.99
a64.12
a64.98
Date
Jan.
Feb.
Mar.
May
June
July
Aug.
Sept.
Oct.
Nov.
Dec.
4,
1
1
1
1
5
1
6
4
5
5
Water
level
1973 a63.55
a58. 59
a63.21
a63.00
a62.30
a60.70
a62.34
a62.33
a66.65
a65.47
a67.25
a Pumping.
WATER LEVEL. IN FEET BELOW LAND-SUflFACE DATUM
it*o
IDc
O
a
<* 
o n
Oc
 4>
05
3 
O.
CD
05 n n 
O3
CO
 o 
o
<D
H 
O
CD 
-M 
W
fO 
00
APPENDIX 6. WATER LEVELS AT RIVER GUT WELL
USGS NUMBER.  174221054470500. Local number 
LOCATION.  Lat 17 42' 21", long 64 47' 05". 
OWNER.  U.S. Virgin Islands Government. 
NAME.  River Gut well.
DATUM.  Altitude of Isd is about 55 ft 
MEASURING POINT.  3/4-in bronze nipple
above Isd.
REMARKS.  Observation well. 
PERIOD OF RECORD.  4atar levels
Cdiscontinuedl. 
EXTREMES FOR PERIOD OF RECORD. 
Fab. 25, 1971; lowest water
above mean sea level, 
on pump concrete base,
which is 2.6 ft
Nov. 1970 - Dec. 1971, Jan. 1973 - Dec. 1973
highest mater lavsl 16.60 ft below Isd, 
level a43.50 ft below Isd, June 1, 1973,
WATER LEVEL, IN
FEET 3ELOW LAND-SURFACE DATUM, NOVEMBER 1970 
INSTANTANEOUS OBSERVATIONS
DECEMBER 1973
uaie
waTer 
uaie
level
No v .
Oac .
Oec.
Jan.
^=eb.
Mar.
Mar,
May
June
July
5, 1970
1
31
29, 1971
25
4
31
3
3
1
17,
18.
17.
17.
16.
17.
22.
18.
a46.
a47.
06
67
11
31
60
30
04
88
51
95
Aug.
Sep.
Seo.
Oct.
Nov.
Oec.
Jan.
Feb.
Mar.
4,
2
30
29
2
4
4,
1
1
1971
1^73
waxer
level
a44.97
a45.33
a43.37
a43.26
17.68
13.54
a45.20
a43.43
a43.33
uate
Apr.
May
June
July
Aug.
Sep.
Oct.
Nov.
Dec.
3, 1973
1
1
5
1
6
4
5
5
water
level
a43.55
a45.70
a48.50
a47.10
a44.8Q
a47.11
19.17
21.26
17.73
a Pumping.