C.
GERAGHTY
'& MILLER, INC.
Environmental Services
Ground Water 
Engineering 
Hydrocarbon 
Remediation 
Education
April 13, 1994
Wallace Turnball
Turn Cow Corporation
P.O. Box 1841
St. Thomas, U.S. Virgin Islands 00803
Re: 
Proposed Supply Well Pumpage Impact Study, Tutu Wells Site.
Dear Mr. Turnball:
On behalf of the Tutu Environmental Investigation Committee (TEIC), Geraghty &
Miller, Inc. is implementing a remedial investigation (RI) as mandated by the U.S.
Environmental Protection Agency (USEPA). As outlined in Geraghty & Miller's Phase II RI
Work Plan, a study of the impact of supply well pumpage on local groundwater levels is
planned. 
This work plan is being implemented with the cooperation of the Virgin Islands
Department of Planning and Natural Resources (DPNR).
This pumpage study proposes using the Eglin II supply well as a pumping well, the
Eglin I and III supply wells and Monitoring Wells SW-6, DW-2, MW-1 ID, MW-12D, OHMW-
2, OHMW-3 and the Harvey Supply Well will be used as observation wells to collect water-level
data over a period of 6 days (see Figure 1). To perform the study, Geraghty & Miller plans to
install temporary electronic water level recorders in the observation wells. The installation of
these recorders will not damage or permanently alter the wells.
The procedure for the study will include the following:
Installation of temporary water-level recorders in Monitoring Wells SW-6 and
DW-2, MW-1 ID, 12D, OHMW-2, OHMW-3, Supply Wells Eglin I, II, and III
and the Harvey Supply Well.
A 2-day period of non-pumpage of Supply Wells Eglin I, II, and III. During this
time, background water-level data will be collected under static (non-pumping)
conditions. During this 2-day period, water will be drawn from the cistern.
Prior to this shutdown, water should be pumped to fill the cistern. If necessary,
TEIC will provide trucked water to be added to the cistern as needed.
A 3-day period of continuous, constant rate pumpage of Supply Well Eglin II,
during which time water-level data will be collected in nearby observation wells.
To ensure a constant pumping rate, a temporary flow meter and gate valve may
have to be installed on the pumping supply well. For this portion of the study,
sufficient storage volume must be available in the cistern or usage should be
TUT 
006 
1126
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GERAGHTY & MILLER. INC.
maintained to accommodate the continuous pumpage. The volume of the cistern,
usage rate, and the optimal pump rate will be determined before the initiation of
the study.
A 24-hour period of non-pumpage will follow during which time recovery data
will be collected in the observation wells. During this period sufficient volume
should be present in the cistern to accommodate usage or trucked water will be
provided.
The proposed date for this study is April 25 through April 30, 1994. If you have any
questions or would like further clarification of any of the procedures outlined above, please feel
free to contact us at your earliest convenience. Thank you.
Sincerely,
GERAGHTY & MILLER, INC.
'John C. Potenzs
Project Scientist
iorScientist/Proj ect
Daniel A. Nachman
Vice President/Project Officer
JCP:TVD/ls
c: 
Caroline Kwan - USEPA
Adrian Shottroff - DPNR
Ana Gloria Ramos - TEIC
Paul Ryan - Texaco
Tim Knutson - Texaco
Chris Gibson - Archer & Greiner
PR0013.027
PR0013.——WP4/041294
TUT 
OO6 1127