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P� IEC ® R 7-Eleven Store#14117 Quarterly Groundwater Monitoring Report(1 Q2004) • June 3, 2004 Page 3 Teflon® bailer or an oil-water interface probe Wells not containing LPH were purged of approximately three casing volumes of water (or to dryness) using a submersible pump or bailer The equipment and purging methods used for the current sampling event are noted on the field data sheets included in Attachment A During purging, temperature, pH, and electrical conductivity were monitored in order to document that these parameters were stable prior to collecting samples After purging, water levels were allowed to recover to 80% of the original levels prior to collection of the water sample Groundwater samples were collected using a disposable Teflon® bailer, placed into appropriate Environmental Protection Agency EPA approved containers, labeled, logged onto chain- of-custody documents, and transported on ice to a California state-certified laboratory Copies of the field notes are included in Attachment A GROUNDWATER SAMPLE ANALYSES AND RESULTS The groundwater samples collected from MW-1 through MW-8 were analyzed for the presence of TPHg, BTEX, and the fuel oxygenates MtBE, tert-butyl alcohol (TBA), dnsopropyl ether (DIPE), ethyl- tert-butyl ether (EtBE), tert-amyl-methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), and 1,2- dibromoethane (EDB) using EPA Method 8260B The certified laboratory analytical report and chain-of-custody documentation are presented as Attachment B Groundwater analytical results are presented on Figure 3, and are summarized in Tables 1 and 2 Chemical concentrations were generally consistent with historical data Dissolved concentrations of TPHg, Benzene, MtBE, and TBA continue to decline in MW-4 TBA was detected in MW-8 for the first time Monitoring and sampling is a coordinated event with the adjacent former Exxon site and SECOR hopes to produce point monitoring data beginning in the second quarter 2004 PURGE AND RINSATE WATER DISPOSAL Water generated during well sampling and equipment cleaning was pumped into a SECOR truck- mounted water tank The water was transferred into properly labeled 55-gallon drums and stored on-site The drummed non-hazardous petroleum hydrocarbon contaminated water is transported quarterly by Belshire Environmental to Demenno Kerdoon in Compton, California, for disposal ATTACHMENTS Figures Tables Attachment A-- Field Notes Attachment B--Certified Laboratory Analytical Reports and Chain-of-Custody Documentation cc Mr Michael Infurna, San Joaquin County Public Health Services Mr James Brathovde, CRWQCB--CVR Sacramento Branch 14117 04-10 Report doc SECOR International Incorporated I