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EC ® R 7-Eleven Store#14117 Quarterly Groundwater Monitoring Report (3Q2003) • December 22, 2003 Page 3 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 are monitored in order to document that these parameters are stable prior to collecting samples After purging, water levels are allowed to recover to 80% of the original levels prior to collection of the water sample Groundwater samples are collected using a disposable Teflon bailer, placed into appropriate 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 have been 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 fuel oxygenates MtBE, tert-butyl alcohol (TBA), diisopropyl ether (DIPE), ethyl- tert-butyl ether (EtBE), and tert-amyl-methyl ether (TAME) using EPA Method 82608 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 MtBE and TBA continue to decline in MW-2, and benzene continues to decline in MW-3 PURGE AND RINSATE WATER DISPOSAL Water generated during well sampling and equipment cleaning is pumped into a SECOR truck- mounted water tank The water is 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 14117 03-30 Report doc SECOR International Incorporated