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• e January 17, 1995 SECOR k rrn, i f rr,rrrc<rrrrti 9rrtrll n C_nr�xrrrrlrort Ms Anastasia Duarte 1 irr rrr,rrur rrlrrl f rr�uuerrrrg Time Oil Company 2737 West Commodore Way Seattle, WA 98199 SUBJECT Quarterly Monitoring Report, October-December 1994 Jackpot Food Mart 1434 West Yosemite Avenue Manteca, California Ms Duarte This report presents the results of quarterly groundwater monitoring and sampling conducted at Time Oil Company's Jackpot Food Mart at 1434 West Yosemite Avenue, Manteca, California (Site) on October 25, 1994 This report also summarizes the status of soil remediation at the Site for the period between October 1 and December 31, 1994 GROUNDWATER MONITORING AND SAMPLING On October 25, 1994 the four groundwater monitor wells, installed as part of an environmental investigation completed in October 1992, were sampled by SECOR 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 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 A groundwater sample from each monitor well was analyzed for total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene, and xylenes (BTEX), by EPA Methods 8015, 8020 respectively Groundwater Elevation Data Groundwater at the site was found to be present at 15 87 to 17 17 feet below ground surface A summary of data regarding groundwater levels through October 25, 1994 is presented in Table 1 Since the last quarterly sampling event, the groundwater potentiometnc surface elevation has increased approximately 0 25 feet Consistent with previous quarters, the groundwater gradient is directed toward the east at a magnitude of approximately 0 002 (Figure 1) SECOR international, Inc rr Time Oil Company Manteca q l 17 January 1995