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f July 25, 1996 SECOR p` I,rre,„crr,r�,rrrl l,rcr,,�,u,rrrccl v C Ms Anastasia Duarte-Wilkinson Time Oil Company ry 2737 West Commodore Way € r, Seattle, WA 98199-1233 SUBJECT: Biannual Monitoring Report, January - June 1996 s Jackpot Food Mart �. 6 1434 West Yosemite Avenue T; Manteca, California rZile I Ms. Duarte-Wilkinson This report presents the results of biannual groundwater monitoring and sampling conducted May 23, 1996 at Time Oil Co. Jackpot Food Mart at 1434 West Yosemite Avenue, Manteca, California Y n 1 (the Site, see Figure 1). i , i GROUNDWATER MONITORING AND SAMPLING Four groundwater monitor wells were sampled on May 23, 1996 These wells were installed as part of an environmental investigation completed in October 1992. Prior to sampling, depth to a water in each groundwater monitor well was taken and subjective analyses were 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 t' were purged of approximately 3 to 5 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 xylenes (BTEX), using modified EPA Method 8015 and EPA Method 602, respectively Groundwater Elevation Data Groundwater at the Site was measured at depths between 13 45 to 14 62 feet below ground surface A summary of data regarding groundwater levels through May 23, 1996 is presented in Table I Since the last monitoring event, the groundwater potentiometric surface elevation has increased approximately 1.55 feet The groundwater gradient is directed toward the northeast at a magnitude of approximately 0 001 ft /ft (Figure 2) g296MMI RPr SBCOR IntermttlwW Inc. ?u1Y zs,ivAa r—, �,rh Srl t Scru(rr,te,rto, ( 1 95810-7001 (910)-,5()-r 016)q56-0110IAA