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SECOR 301MOre rtoaso:�wte 100 <br /> S ® INTERNATIONAL Rancho Cordova CA 95670 <br /> INCORPORATED 918-881.0400 TR <br /> 948-881-0430 FAX <br /> May 17, 2004 <br /> Mr Scott Sloan e=.7 F ILE <br /> Time Oil Company <br /> 2737 West Commodore Way <br /> Seattle, WA 98199 <br /> RE Quarterly Monitoring Report, January — March 2004 <br /> Jackpot Food Mart <br /> 14000 East Highway 88 <br /> Lockeford, California <br /> SECOR Project No 770T 41737 00 <br /> Mr Sloan <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)/air sparge (AS) <br /> remediation system at the site <br /> GROUNDWATER MONITORING AND SAMPLING <br /> Eight groundwater monitor wells (MW-2 through MW-4, MW-6 through MW-10) at the site were sampled on <br /> January 5, 2004 Monitor well MWA was not sampled due to the presence of 0 02 feet of liquid phase <br /> hydrocarbons(LPH) Monitor well MW-5 was not sampled as it was reportedly dry this quarter Monitor wells <br /> MWA through MW-4 were installed as part of an environmental investigation conducted in December 1994 <br /> In July 1996, monitor wells MW-5 through MWA 0 were installed as part of an additional environmental site <br /> assessment 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 slowly transferred to laboratory-cleaned sample containers, sealed <br /> with Teflon'-lined caps, labeled with the sample number, sample time and date, and immediately placed on <br /> ice in an insulated container Each sample was logged onto a chain-of-custody record for delivery to <br /> Excelchem Environmental Labs located in Roseville,California Groundwater samples were analyzed for total <br /> petroleum hydrocarbons as gasoline(TPHg) and benzene,toluene,ethylbenzene,and xylenes(BTEX)using <br /> modified EPA Method 8015 Modified/8021, and for fuel oxygenates including methyl tertiary butyl ether <br /> (MTBE), di-isopropyl ether(DIPS), ethyl tertiary butyl ether(ETRE), tertiary amyl methyl ether(TAME), and <br /> tertiary butanol (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 /> I\Time OillLockefordlQMRs12001-2004\Lockeford 01-04 doe <br />