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July 25, 1996 Il11C'111L11!(i11(1��]1C( J�( 1CllC'Cl u�k Ms Anastasia Duarte-Wilkinson Time Oil Company r, 2737 West Commodore Way Seattle, WA 98199 , SUBJECT: Quarterly Monitoring Report, April - June 1996 Jackpot Food Mart } 14000 East Highway 88 5n E Lockeford, California Y 4 Ms Duarte-Wilkinson t This report presents the results of quarterly groundwater monitoring and sampling conducted at Time Oil Co Jackpot Food Mart at 14000 East Highway, Lockeford, California (the Site, see Figure 1) 1 1 GROUNDWATER MONITORING AND SAMPLING Four groundwater monitoring wells were sampled on May 23, 1996. These wells were installed as . part of an environmental investigation conducted in December 1994 Pnor to sampling, depth to water it each groundwater monitor well was taken and subjective analyses performed. The subjective analyses consisted of checking for floating product or a hydrocarbon sheen by lowenng a clean Teflon bailer down the well and collecting a sample at the groundwater-aur interface Wells were purged of approximately 2 to 4 casing volumes of water or until groundwater parameters of pH, temperature, and conductivity stabilized as measured by portable meters calibrated to a standard buffer and conductivity standard (Attachment 1) Groundwater samples were then collected by lowering a clean disposable bailer into the well and collecting a representative sample of the formation water The groundwater sample was slowly transferred to laboratory-cleaned sample containers, sealed with Teflon lined caps, and transferred to cooled storage The samples were then transported under suitable chain-of-custody to a State of California certified laboratory for the requested testing. Each groundwater sample was analyzed for total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene, and total xylene isomers (BTEX), using modified EPA Method 8015, and EPA Method 602 respectively Groundwater Elevation Data Groundwater at the Site was measured at depths between 72 50 to 84.40 feet below ground surface. A summary of data regarding groundwater levels through May 23, 1996 is presented in Table 1 Since the last sampling event, the groundwater potentiometnc surface elevation has increased an average of 0 57 feet. Generally consistent with the previous five quarters, the groundwater gradient is directed toward the southeast at a magnitude of approximately 0.15 ft./ft. (Figure 2). LCKFRpgm2% J0710.001-01 SECOR July 25 IM 1;r ;1th S/�cc't SC1curlr1t111r, {.1 958/6--00! (916) 1564 31 t916) r56-0110"'4 d 'k