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7-Eleven Store#20632 <br /> • Quarterly Groundwater Monitoring Report(4Q2003) <br /> February 20, 2004 <br /> Page 3 <br /> GROUNDWATER SAMPLE ANALYSES AND RESULTS <br /> The groundwater samples collected from MW-1, MW-2, MW-3, MW-4R, MW-5, MW-6, and MW-7 <br /> were analyzed for the presence of TPHg, benzene, toluene, ethylbenzene, and total xylenes <br /> (BTEX), and fuel oxygenates MtBE, tert-butyl alcohol (TBA), diisopropyl ether (DIPS), ethyl-tert-butyl <br /> ether(EtBE), and tert-amyl-m ethyl ether (TAME) using EPA Method 8260B The certified laboratory <br /> analytical report and chain-of-custody documentation are presented as Attachment B <br /> Groundwater analytical results are presented on Figure 3 and are summarized in Tables 1 and 2 <br /> Chemical concentrations were generally consistent with historical data TBA continues to increase in <br /> MW-2 <br /> PURGE AND RINSATE WATER DISPOSAL <br /> Water generated during well sampling and equipment cleaning is pumped into a SECOR truck- <br /> mounted water tank The water is transferred into properly labeled 55-gallon drums and stored on- <br /> site The drummed non-hazardous petroleum hydrocarbon contaminated water is transported <br /> quarterly by Belshire Environmental to Demenno Kerdoon in Compton, California, for disposal <br /> ATTACHMENTS <br /> Figures <br /> Tables <br /> • Attachment A— Field Notes <br /> Attachment B—Certified Laboratory Analytical Reports and Chain-of-Custody Documentation <br /> cc Mr Harlin Knoll, San Joaquin County Environmental Health Department <br /> Mr James Barthovde, Regional Water Quality Control Board-Central Valley Region <br /> 20632 03-4Q Report SECOR Intemational Incorporated <br />