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sEcoR July 31, 2001 International Incorporated Ms Anastasia Duarte-Wilkinson Time Oil Company 2737 West Commodore Way Seattle, WA 98199 SUBJECT: Quarterly Monitoring Report,April—June 2001 Jackpot Food Mart 14000 East Highway 88 Lockeford, California Ms Duarte-Wilkinson This report presents the results of quarterly groundwater monitoring and sampling conducted at the Jackpot Food Mart at 14000 East Highway 88, Lockeford, California (the site, see Figure 1). In addition,the operation of the soil vapor extraction and air sparging remediation system is described GROUNDWATER MONITORING AND SAMPLING • Ten groundwater monitor wells were sampled on April 27, 2001 at the site Monitor wells MW-1 through MW-4 were installed as part of an environmental investigation conducted in December 1994 In July 1996, monitor wells MW-5 through MW-10 were installed as part of an additional environmental site assessment Prior to purging each groundwater monitor well,a water sample 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 2 to 4 casing 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 If the well was slow to recover or purged dry, the water level in the monitor well was allowed to recover to at least 80 percent of its static level before sampling The groundwater samples were then collected by lowering a clean disposable bailer into the well and collecting a representative sample The groundwater samples were slowly transferred to laboratory- cleaned sample containers,sealed with Teflon°-lined caps, labeled with the sample number,sample time and date, and immediately placed on ice in an insulated container Each sample was logged onto a chain-of-custody record for subsequent delivery to Excelchem Environmental Labs located in Roseville, California Groundwater samples were analyzed for TPHg and BTEX using modified EPA Method 60218015, and by EPA Method 8260 for fuel oxygenates methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), and tertiary butanol (TBA) • C lreme OiN,ckefoWQ201 1 SECOR 077 41737 OOJ July 31 2001 017 hil�w(( Koad swit /Of) Ran(bo (oidoru ( 1 95670 910 801 0400 916 801 04W 1111 itrr« %<cm UM