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SECOR www secorcom R INTERNATIONAL R S E C ® INCORPORATED 3017 Kilgore Road,Sude 104 Rancho Cordova,CA 95670 • 916 861 0400 TEL F 9 1 861 0430 FAX February 4, 2004 R IE CE `W11 i Ms Anastasia Duarte-Wilkinson FEB 12 2004 Time Oil Company 2737 West Commodore Way ENVIRONMENT HEALTH Seattle, WA 98199 PERMIT/SERVICES RE Quarterly Monitoring Report, October— December 2003 Jackpot Food Mart 14000 East Highway 88 Lockeford, California SECOR Project No 770T 41737 00 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, this report also includes a quarterly summary of the operation of the soil vapor extraction (SVE)/air sparge (AS) remediation system at the site • GROUNDWATER MONITORING AND SAMPLING Seven groundwater monitor wells were sampled on October 20,2003 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 MWA0 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 was performed The subjective analyses consisted of checking for the presence of liquid-phase hydrocarbons (LPH)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 LPH 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 delivery to Excelchem Environmental Labs located in Roseville, California Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene,and xylenes(BTEX) using modified EPA Method 801518020,and for fuel oxygenates including methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETRE), tertiary amyl methyl ether (TAME), and tertiary butanol (TBA) using EPA Method 82608 GROUNDWATER ELEVATION DATA Depth to groundwater was obtained from the existing groundwater monitor wells at the site using a water level indicator graduated to 0 01 foot The depth to groundwater measurement was used to calculate a • groundwater elevation for each well,and construct a groundwater elevation contour map(Figure 2) Using the groundwater elevation contour map, the local groundwater flow direction and hydraulic gradient were determined Groundwater at the site was measured at depths between 71 98 to 93 11 feet below ground surface (bgs) The groundwater potentiometnc surface elevation averaged approximately 23 49 feet bgs I\Time Oil\Lockeford\QMRs12001-2003\Lockeford Q4-03 doc