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S E C 0 R <br /> 7-Eleven Store#21756 <br /> Quarterly Groundwater Monitoring Report (1Q2003) <br /> May 16,2003 <br /> Page 3 <br /> r� <br /> `� <br /> Teflon° bailer or an oil-water interface probe Wells not containing LPH are purged of approximately <br /> three casing volumes of water (or to dryness) using a submersible pump or bailer The equipment <br /> and purging methods used for the current sampling event are noted on the field data sheets included <br /> in Attachment A During purging, temperature, pH, and electrical conductivity are monitored in order <br /> to document that these parameters are stable prior to collecting samples After purging, water levels <br /> are allowed to recover to 80% of the original levels prior to collection of the water sample <br /> Groundwater samples are collected using a disposable Teflon® bailer, placed into appropriate EPA- <br /> approved containers, labeled, logged onto chain-of-custody documents, and transported on ice to a <br /> California state-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 MW-4 were analyzed for the presence of <br /> TPHg, BTEX, and fuel oxygenates MtBE, TBA, dusopropyl ether (DIPE), ethyl-tert-butyl ether (EtBE), <br /> and tort-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 /> s�. <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 $aa <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- ,r <br /> site The drummed non-hazardous petroleum hydrocarbon contaminated water is transported ky�fi <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 EHD <br /> Mr James Barton, RWQCB, Central Valley Region <br /> a <br /> 5r <br /> 1 <br /> 21756 03-10 Report SECOR Intematfonal Incorporated pa <br /> k r� <br /> Yr <br /> F <br />