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S <br /> 7-Eleven Store#20632 <br /> • Quarterly Groundwater Monitoring Report (102004) <br /> April 21, 2004 <br /> Page 3 <br /> chain-of-custody documents, and transported on ice to a California state-certified laboratory Copies <br /> of the field notes are included in Attachment A <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), dusopropyl ether(DIPS), ethyl-tert-butyl <br /> ether (EtBE), and tert-amyl-methyl 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 decline in <br /> well MW-4R, but was detected for the first time in well MW-6, an upgradient well <br /> PURGE AND RINSATE WATER DISPOSAL <br /> Water generated during well sampling and equipment cleaning was pumped into a SECOR truck- <br /> mounted water tank The water was transferred into properly labeled 55-gallon drums and stored <br /> on-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 /> • <br /> 20632 04-10 Report doc SECOR Intematlonal Incorporated <br />