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SECOR <br /> lilt(?)national lucotpoiated <br /> April 15, 1998 <br /> Ms Anastasia Duarte-Wilkinson <br /> Time Oil Company <br /> 2737 West Commodore Way <br /> Seattle, WA 98199 <br /> SUBJECT Quarterly Monitoring Report,January - March 1998 <br /> Jackpot Food Mart <br /> 14000 East Highway 88 <br /> Lockeford, California <br /> Ms Duarte-Wilkinson <br /> This report presents the results of quarterly groundwater monitoring and sampling conducted at the <br /> Jackpot Food Mart at 14000 East Highway, Lockeford, California(the site, see Figure 1) <br /> :GROUNDWATER MONITORING AND SAMPLING <br /> Ten groundwater monitor wells were sampled on January 27, 1998 at the site Monitor wells MW-1 <br /> through MW-4 were installed as part of an environmental investigation conducted in December <br /> 1994 In July 1996, monitor wells MW-5 through MW-10 were installed as part of an additional <br /> environmental site assessment Prior to purging each groundwater monitor well, a water sample was <br /> taken and subjective analyses performed The subjective analyses consisted of checking for floating <br /> product or a hydrocarbon sheen by lowering a clean teflon bailer down the well and collecting a <br /> sample at the groundwater-air interface Wells not containing floating product were purged of <br /> approximately 2 to 4 casing volumes of water or until groundwater parameters of pH, temperature, <br /> and conductivity stabilized as measured by portable meters calibrated to a standard buffer and <br /> conductivity standard If the well was slow to recover or purged dry, the water level in the monitor <br /> well was allowed to recover to at least 80 percent of its static level before sampling The <br /> groundwater samples were then collected by lowering a clean disposable bailer into the well and <br /> collecting a representative sample The groundwater samples were slowly transferred to laboratory- <br /> cleaned sample containers, sealed with teflon caps, labelled with the sample number, sample time <br /> and date, and immediately placed on ice in an insulated container Each sample was logged onto a <br /> chain-of-custody record for subsequent delivery to Excelchem Environmental Labs located in <br /> Roseville, California Groundwater samples were analyzed for TPHg, BTEX, and MTBE using <br /> modified EPA Method 8015, and EPA Method 602 respectively Sample MW-DUP was submitted <br /> as a field duplicate for monitor well MW-9 <br /> SECOA <br /> LCKFRDgm 198 Apnl 15 1998 <br /> 7G00"01 o1 ' <br /> 991213wno%Park Dru c 5inie 100 5acra1nelito (A 95827 (916) 364-1880(916) 364-1889 H X tru it :cern cum <br />