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S E C ® IR <br /> 7-Eleven Store#21756 <br /> Quarterly Groundwater Monitoring Report(2Q2003) <br /> July 28, 2003 <br /> Page 3 <br /> presence of liquid-phase petroleum (LPH) using a clear Teflone bailer or an oil-water interface probe <br /> Wells not containing LPH are purged of approximately three casing volumes of water (or to dryness) <br /> using a submersible pump or bailer The equipment and purging methods used for the current <br /> sampling event are noted on the field data sheets included in Attachment A During purging, <br /> temperature, pH, and electrical conductivity are monitored in order to document that these <br /> parameters are stable prior to collecting samples After purging, water levels are allowed to recover <br /> to 80% of the original levels prior to collection of the water sample Groundwater samples are <br /> collected using a disposable Teflon" bailer, placed into appropriate EPA-approved containers, <br /> labeled, logged onto chain-of-custody documents, and transported on ice to a California state- <br /> certified laboratory Copies of the field notes have been included in Attachment A <br /> GROUNDWATER SAMPLE ANALYSES AND RESULTS <br /> The groundwater samples collected from MW-1 through MW4 were analyzed for the presence of <br /> TPHg, BTEX, and fuel oxygenates MtBE, TBA, dusopropyl ether (DIPE), ethyl-tert-butyl ether(EtBE), <br /> and tert-amyl-methyl ether (TAME) using EPA Method 8260B The certified laboratory analytical <br /> 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 <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 A <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 EHD <br /> Mr James Barton, RWQCB, Central Valley Region <br /> 21756 03-2Q Report doc SECOR International Incorporated <br />