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i <br /> SECOR <br /> February 25, 2000 hitc ;11ftlloWd IM O11y'leftc el <br /> Ms Anastasia Duarte-Wilkinson <br /> Time Oil Company <br /> 2737 West Commodore Way <br /> Seattle, WA 98199 <br /> SUBJECT. Quarterly Monitoring Report, October- December 1999 <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) In <br /> addition, the recent installation and start-up of a soil vapor extraction and air sparging remediation <br /> system is briefly described <br /> GROUNDWATER MONITORING AND SAMPLING <br /> Ten groundwater monitor wells were sampled on November 24, 1999 at the site Monitor wells <br /> MW-1 through MW-4 were installed as part of an environmental investigation conducted in <br /> December 1994 In July 1996, monitor wells MW--5 through MW-l 0 were installed as part of an <br /> additional environmental site assessment Prior to purging each groundwater monitor well, a water <br /> sample was taken and subjective analyses performed The subjective analyses consisted of checking <br /> for floating product or a hydrocarbon sheen by lowering a clean teflon bailer down the well and <br /> collecting a sample at the groundwater-air interface Wells not containing floating product were <br /> purged of approximately 2 to 4 casing volumes of water or until groundwater parameters of pH, <br /> temperature, and conductivity stabilized as measured by portable meters calibrated to a standard <br /> buffer and conductivity standard If the well was slow to recover or purged dry, the water level in <br /> the monitor 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, labeled with the sample number, sample time and <br /> date, and immediately placed on ice in an insulated container Each sample was logged onto a chain- <br /> of-custody record for subsequent delivery to Excelchem Environmental Labs located in Roseville, <br /> California Groundwater samples were analyzed for TPHg, BTEX and MTBE using modified EPA <br /> Method 8015, and EPA Method 602 respectively Sample DUP was submitted as a field duplicate <br /> i <br /> for monitor well MW-1 <br /> 0 LTime OMLockefardQ4 99 SECOR <br /> 077 41737 003 February 25 2000 <br /> !(Y1 lrxlru)rcrtlr� I �J�S?� X1)/0) ,0 1 1)16 ,01 15ti�� 1rr <br />