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April 22, 1996 E C t il x" III/o 11alroluol hico1polated Ms Anastasia Duarte-Wilkinson Time Oil Company ^ 2737 West Commodore Way Seattle, WA 98199 SUBJECT: Quarterly Monitoring Report, January - March 1996 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 Time 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 February 28, 1996 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 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 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-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 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 27 to 84.96 feet below ground surface. A summary of data regarding groundwater levels through February 28, 1996 is presented in Table 1 Since the last sampling event, the groundwater potentiometric surface elevation has increased an average of 0.75 feet Generally consistent with the previous four quarters, the groundwater gradient is directed toward the southeast at a magnitude of approximately 0 14 ft !ft (Figure 2). L4CKFRDgm,196 SECOR Nw"01-01 Apr1172.19% _ S Q11) ol101 j� }