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7-Eleven Store#17334 <br /> Quarterly Groundwater Monitoring Report (1Q2006) <br /> April 4, 2006 <br /> Page 4 <br /> (EtBE), and tert-amyl-methyl ether (TAME) by EPA Method 8260B The certified laboratory <br /> analytical report and chain-of-custody documentation are in Attachment B <br /> Groundwater analytical results are presented on Figure 3, and are summarized in Tables 1 <br /> and 2 Petroleum hydrocarbon concentrations were generally consistent with historical data <br /> in wells MW-2, MW-3, MW-4, MW-5A and MW-5B MtBE concentrations continue to <br /> decrease in wells MW-3 and MW-4 <br /> PURGE AND RINSATE WATER DISPOSAL <br /> Water generated during well sampling and equipment cleaning was pumped into a SECOR <br /> truck-mounted water tank The water was transferred into properly labeled 55-gallon drums <br /> and stored on-site The drummed non-hazardous petroleum hydrocarbon contaminated <br /> water is transported quarterly by Belshire Environmental to DeMenno Kerdoon in Compton, <br /> California, for disposal <br /> Sincerely, <br /> SECOR International Incorporated <br /> Prepared by Reviewed by <br /> Colin Ryan Damon Brown <br /> Staff Geologist Project Geologist <br /> Reviewed by <br /> Ed Simonis, P Gcrow- <br /> Sentor Geologist , z <br /> � y <br /> ATTACHMENTS No 4422 <br /> Figures <br /> Tables <br /> Attachment A— Field Notes <br /> Attachment B —Certified Laboratory Analytical Reports and Cham-of-Custody Documentation <br /> cc Mr Harlin Knoll, San Joaquin County Environmental Health Department <br /> Mr James Barton, California Regional Water Quality Control Board, Central Valley Region <br /> Mr John Wainwright, SECOR, 308 East 4500 South, Suite 100, Murray, Utah 84107-3957 <br /> 17334 06-1Q Report doc SECOR Intemahonal Incorporated <br />