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October 21, 2002 International Incorporated <br /> z 2002 <br /> ENVIRONMENT HEALTH <br /> Ms Anastasia Duarte-Wilkinson PERMIT/SERVICES <br /> Time Oil Company <br /> 2737 West Commodore Way <br /> Seattle, WA 98199 <br /> SUBJECT: Quarterly Monitoring Report, July —September 2002 <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 88, Lockeford, California (the site, see Figure 1) In <br /> addition,the operation of the soil vapor extraction and air sparging remediation system is described <br /> GROUNDWATER MONITORING AND SAMPLING <br /> • Nine groundwater monitor wells were sampled on July 25, 2002 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 liquid- <br /> phase hydrocarbons(LPH)or a hydrocarbon sheen by lowering a clean Teflon bailer down the well <br /> and collecting a sample at the groundwater-air interface Wells not containing LPH 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®-lined caps,labeled with the sample number,sample <br /> time and date, and immediately placed on ice in an insulated container Each sample was logged <br /> onto a chain-of-custody record for subsequent delivery to Excelchem Environmental Labs located in <br /> Roseville, California Groundwater samples were analyzed for TPHg and BTEX using modified <br /> EPA Method 602/8015, and by EPA Method 8260 for fuel oxygenates methyl tertiary butyl ether <br /> (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether <br /> (TAME), and tertiary butanol (TBA) <br /> C 17Ime 0tUA ke[ordQ202 SECOR <br /> 770T 41737 00 0003 <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916 861 0400 916 861 0430 Fax www secor com <br />