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� rs / YY f S OR Ec h1h itcltt�,ll�ll lalcnl jrrrlrttcrl M1, October 13, 1997 , Ms Anastasia Duarte-Wilkinson ` Time Oil Company 2737 West Commodore Way r Seattle, WA 98199 SUBJECT: Quarterly Monitoring Report, July - September 1997 M 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, Lockeford, California (the site, see Figure 1) • GROUNDWATER MONITORING AND SAMPLING Ten groundwater monitor wells were sampled on July 14, 1997 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 welts 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 a` 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 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, 4.b California Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), and benzene, toluene, ethylbenzene, and xylenes (BTEX), using modified EPA Method 8015, and EPA Method 602 respectively Additionally, two groundwater samples were analyzed for ;? methyl tert-butyl ether (MTBE) using EPA Method 602 Sample MW-I i was submitted as a field 1 duplicate for monitor well MW-1 40 SECOR LCKFRpgm X97 May 6 1997 _ ]0710 001 01 a ,oiolit, r r„!f �11i1, 201 Selz rnr,rrl� r 4 �>>�ti'?� 19I��i ;�1 1�ti'ti1�(91b) ;hl IS8911% frith W-4 <<,ni