Letter with attached table regarding Relocation of Pumping Tests and Revised Schedule, Tutu Service Station Investigation, St. Thomas, U.S. Virgin Islands
& MILLER, INC. Environmental Services Ground Water Engineering Hydrocarbon Remediation Education October 20, 1992 Ms. Caroline Kwan, Project Manager USEPA-Region II 26 Federal Plaza, Room 737 New York, NY 10278 Re: Relocation of Pumping Tests and Revised Schedule Tutu Service Station Investigation St. Thomas, U.S. Virgin Islands Dear Ms. Kwan: Based on information collected from the first round of ground-water sampling of the monitoring wells, Geraghty & Miller, Inc. has decided to relocate the upcoming pumping tests from MW-10 and MW-10D to MW-6R and MW-6D. During the purging of MW-10, the well was pumped dry within 12 minutes at a rate of 2 gallons per minute (gpm) and MW-10D was pumped dry within 25 minutes at a rate of 8 gpm. In comparison, MW-6R and MW-6D maintained a flow rate of 4 gpm and 8 gpm, respectively, therefore providing a sufficient yield for the pumping tests. Table 1 presents an update of the preliminary schedule for the pumping tests. …
Download the original document · Plain text (TXT) · Browse the archive · How this archive works
Original source: https://semspub.epa.gov/src/document/02/64875
SHA-256 0d90f5442a2e885c4c272043c3ae7c26607f61e00f812dea052a9628f8f7770e
Re-using this document
CERCLA administrative record
Our description, tagging, arrangement, extracted text and machine transcripts are released under CC0 1.0. We assert nothing about the document itself.
Archive identifier LF-0d90f5442a2e
Document text
& MILLER, INC. Environmental Services Ground Water Engineering Hydrocarbon Remediation Education October 20, 1992 Ms. Caroline Kwan, Project Manager USEPA-Region II 26 Federal Plaza, Room 737 New York, NY 10278 Re: Relocation of Pumping Tests and Revised Schedule Tutu Service Station Investigation St. Thomas, U.S. Virgin Islands Dear Ms. Kwan: Based on information collected from the first round of ground-water sampling of the monitoring wells, Geraghty & Miller, Inc. has decided to relocate the upcoming pumping tests from MW-10 and MW-10D to MW-6R and MW-6D. During the purging of MW-10, the well was pumped dry within 12 minutes at a rate of 2 gallons per minute (gpm) and MW-10D was pumped dry within 25 minutes at a rate of 8 gpm. In comparison, MW-6R and MW-6D maintained a flow rate of 4 gpm and 8 gpm, respectively, therefore providing a sufficient yield for the pumping tests. Table 1 presents an update of the preliminary schedule for the pumping tests. As requested by the USEPA and agreed to by Ana Gloria Ramos, Designated Coordinator, Tutu Environmental Investigation Committee, the current schedule includes an extension of the pumping test at the deep monitoring well (MW-6D) to possibly 72 hours, in order to allow for stabilization after potential delayed yield. The 72-hour pumping test will be stopped after 24 or 48 hours if the data indicates that a delayed yield is not still present. The field data will be 201 West Passaic Street, 3rd Floor• RocheUe Park, New Jersey 07662'(201) 909-0700-FAX (201) 909-0567/0568 *64875* 64875 GERAGHTY & MILLER, INC. plotted for review by USEPA representatives prior to deciding when to end the test. If you have any questions, please call. c: Ana Gloria Ramos - TEIC Jose Agrelot - Soil Tech Sally Odland - CDM CM:cmw #PR01301-wp3/101392.LTR Sincerely, GERAGHTY & MILLER, INC. Clinton Moffatt Staff Scientist — ^ Thomas V. Danahy (J Senior Scientist/Project Manager Daniel A. Nachman Project Director/Project Officer TUT 006 1729 .^ Table i. Anticipated Schedule for Pumping Tests in October and November 1992, Tutu Service Station Investigation, St. Thomas, U.S. Virgin Islands. Date Activity Thursday, October 29 Friday, October 30 Monday, November 2 @ 10:00 a.m. Thursday, November 5 @ 10:00 a.m. Friday, November 6 Monday, November 9 @ 10:00 a.m. Tuesday, November 10 @ 10:00 a.m. Set—up water—level recorders for pre—pumping trend. 4—hour step-test at MW—6D; record recovery. Set—up recorder for pre—pumping trend for November 2 test Start 72-hour pumping test at MW-6D; pumping rate to be determined from the results of October 30 step-test. End test; record recovery; data analysis. 4-hour step-test at MW-6R; record recovery. Set-up recorder for pre—pumping trend for November 9 pumping test. Start 24—hour pump test at MW—6R; pumping rate to be determined from November 6 step-test. End test; record recovery. PR01301 -#3/91492tbl.wk3 GERAGHTY & MILLER. INC. TUT OO6 173O