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SCR February 5, 1996 /;?/(,1 national hlc nsl)(»cated Ms Anastasia Duarte--Wilkinson Time Oil Company 2737 West Commodore Way Seattle, WA 98199 SUBJECT: Quarterly Monitoring Report, September - December 1995 Jackpot Food Mart 14000 East Highway 88 Lockeford, California Ms Duarte-Wilkinson This report presents the results of quarterly groundwater monitoring and sampling conducted at Tune Oil Company's Jackpot Food Mart at 14000 East Highway, Lockeford, California (the Site, see Figure 1, Site Location Map) GROUNDWATER MONITORING AND SAMPLING Four groundwater monitoring wells were sampled on December 19, 1995 These wells were installed as part of an environmental investigation conducted in December 1994 Prior to sampling, depth to water in each groundwater monitor well was taken and subjective analyses performed The subjective analyses consisted of checking for floating product or a hydrocarbon sheen by lowering a clean Teflon bailer down the well and collecting a sample at the groundwater-air interface Wells not containing floating product were purged of approximately 2 to 4 casmg 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 I) 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-cIeaned 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 xylenes isomers (BTEX), using modified EPA Method 8015, and EPA Method 602 respectively Groundwater Elevation Data Groundwater at the Site was measured at depths between 73 42 to 85 19 feet below ground surface A summary of data regarding groundwater levels through December 19, 1995 is presented in Table 1 Since the last sampling event, the groundwater potentiometric surface elevation has increased an g495MAN Wpl, 4ECOR International Inc N0005-001 01 5 February 1996 1-N ;olh Nli cc, Saciamellto C l 05510--001 (916)-156-t. .i (9161 15601101,1\ fi