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C. '& MILLER, INC. Environmental Services Ground Water Engineering Hydrocarbon Remediation Education April 13, 1994 Richard Smith Law Offices of John K. Dema, P.C. 1236 Strand Street Suite 103 Christiansted, St. Croix U.S. Virgin Islands 00820-5008 Re: Proposed Supply Well Pumpage Impact Study, Four Winds Plaza, Tutu Wells Site. Dear Mr. Smith: 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 Four Winds I, Four Winds II, and Four Winds III, supply wells and nearby monitoring 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 monitoring wells. The installation of these recorders will not damage or permanently alter the monitoring wells. The procedure for the study will include the following: Installation of temporary water-level recorders in the following wells: CHT-4, SW-2, CHT-1, TT-6, MW-25, MW-9, Four Winds I, and Four Winds II, and Four Winds III. A 2-day period of non-pumpage of Supply Wells Four Winds I, II, and III. During this time, background data will be collected under static (non-pumping) conditions. During these 2-days water will be drawn from the Four Winds cistern. Prior to this shutdown sufficient water should be pumped into the cistern to assure an adequate two-day supply. A 3-day period of continuous, constant rate pumpage of Supply Well Four Winds I during which time water-level data will be collected in nearby monitoring wells. To ensure a constant pumping rate, a temporary flow meter may have to be installed on the pumping supply well. For this portion of the study, sufficient volume should be available in the cistern to accommodate the continuous TUT 006 1124 201 West Passaic Street, 3rd Floor • Rochelle Park, New Jersey 07662'(201) 909-0700'FAX (201) 909-0567/0568 25' *64719* 64719 GERAGHTY & MILLER, INC. pumpage. To assure this, the volume of the cistern and the optimal pump rate must 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 monitoring wells. During this period, sufficient volume should be present in the cistern to accommodate usage. The proposed date of this study is May 1 through May 7, 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. Potenza // Project Scientist / hjvt<Lcc/3 V. Thomas V^Danahy Senior Scientist/project Manager 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 PR0013.0Z7 PR0013.——WP4/041294 TUT 006 1125