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6 SECOR www secorcom <br /> INTERNATIONAL <br /> ® R <br /> INCORPORATED 3017 Kilgore Road Suite 100 <br /> Rancho Cordova CA 95670 <br /> 916-861-0400 TEL <br /> 916-86i-0430 FAX <br /> November 23, 2004 <br /> Mr Mark Chandler <br /> Time Oil Company <br /> 2737 West Commodore Way <br /> Seattle, WA 98199 <br /> RE Quarterly Monitoring Report,July—September 2004 <br /> Jackpot Food Mart <br /> 14000 East Highway 88 <br /> Lockeford, California <br /> SECOR Project No 770T 41737 00 <br /> Mr Chandler <br /> This report presents the results of quarterly groundwater monitoring and sampling conducted at the Jackpot <br /> Food Mart at 14000 East Highway 88, Lockeford, California (the site, see Figure 1) In addition,this report <br /> also includes a quarterly summary of the operation of the soil vapor extraction (SVE)lair sparge (AS) <br /> remediation system at the site <br /> GROUNDWATER MONITORING AND SAMPLING <br /> Nine groundwater monitor wells (MW-1 through MW-4, MW-6 through MW-10)at the site were sampled on <br /> July 23, 2004 Monitor well MW-5 was not sampled as it was dry this quarter Monitor wells MWA through <br /> MW-4 were installed as part of an environmental investigation conducted in December 1994 In July 1996, <br /> monitor wells MW-5 through MW-10 were installed as part of an additional environmental site assessment <br /> Procedures for groundwater monitoring and sampling are described below <br /> Prior to purging each groundwater monitor well, a water sample was taken, and subjective analyses was <br /> performed The subjective analyses consisted of checking for the presence of LPH or a hydrocarbon sheen by <br /> lowering a clean Teflon®bailer down the well and collecting a sample at the groundwater-air interface Wells <br /> not containing LPH were purged of approximately 2 to 4 casing volumes of water or until groundwater <br /> parameters of pH, temperature, and conductivity stabilized as measured by portable meters calibrated to a <br /> standard buffer and conductivity standard If the well was slow to recover or purged dry,the water level In the <br /> monitor well was allowed to recover to at least 80 percent of its static level before sampling Groundwater <br /> samples were then collected by lowering a clean disposable bailer into the well,and collecting a representative <br /> sample The groundwater samples were transferred to laboratory-cleaned sample containers, sealed with <br /> Teflon®-lined caps,labeled with the sample number,sample time and date,and immediately placed on ice in <br /> an insulated container Each sample was logged onto a chain-of-custody record for delivery to Excelchem <br /> Environmental Labs located in Roseville,California Groundwater samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg)and benzene, toluene, ethylbenzene,and xylenes (BTEX)using modified <br /> EPA Method 8015 Modified/8021, and for fuel oxygenates including methyl tertiary butyl ether (MTBE), di- <br /> Isopropyl ether(RIPE),ethyl tertiary butyl ether(ETBE),tertiaryamyl methyl ether(TAME),and tertiary butanol <br /> (TBA) using EPA Method 8260B <br /> GROUNDWATER ELEVATION DATA <br /> Depth to groundwater was obtained from the existing groundwater monitor wells at the site using a water level <br /> indicator graduated to 0 01 foot The depth to groundwater measurement was used to calculate a <br /> groundwater elevation for each well,and construct a groundwater elevation contour map(Figure 2) Using the <br /> groundwater elevation contour map, the local groundwater flow direction and hydraulic gradient were <br /> evaluated Groundwater at the site was measured at depths between 71 74 to 88 61 feet below ground <br /> 1 ITirne OIIILocketord\QMRs12004\Lockeford Q3-04 doc <br />