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WALLACE • KUHL <br /> January 13, 1998 1 <br /> &ASSOCIATES INC. <br /> Mr, Steve Jerkins •�' ,` P; 13 <br /> Crystal Creamery <br /> rY <br /> 1013 D Street <br /> Sacramento, California 95 814 <br /> Quarterly Status Report <br /> 404 WEST FREMONT STREET <br /> Stockton, California <br /> WKA No. 1628.08 <br /> Dear Mr. Jerkins, <br /> As required by the San Joaquin County Public Health Services, we are submitting <br /> this quarterly status report for the subject property located at 404 West Fremont <br /> Street in Stockton, California (Plate 1). <br /> Most recent ground water elevation measurements of the seven on-site monitoring <br /> wells (MW1 through MW7) and city of Stockton Well SMW2) were obtained on <br /> December 30, 1997. Based on this most recent ground water elevation <br /> measurement, ground water ranges between approximately 17 and 18 feet below <br /> grade (Table 1). The pow direction beneath the site was calculated to be to the <br /> ., northeast with a variable gradient. Groundwater contours for December of 1998 <br /> are presented on Plate 2. <br /> Prior to sampling, the depth to groundwater was measured in each well using a <br /> Solist electronic water level indicator. The depth to groundwater measurements <br /> were used to calculate the volume of water in each well. Once calculated, <br /> ,., approximately three well volumes of water were purged from each well using a <br /> two-inch submersible pump until temperature, pH, and conductivity readings <br /> stabilized and/or the water cleared of sediment. The water samples were then <br /> collected through the sampling pump. Sample water pumped from the well was <br /> poured into appropriate sample containers provided by the laboratory. <br /> The samples were immediately placed in an ice-chest with ice and submitted under <br /> M r, chain-of-custody to a California-certified laboratory for analysis of Total Petroleum <br /> Hydrocarbons (TPH) as gasoline using EPA test method 8015 modified, Benzene, <br /> Toluene, Ethylbenzene and Total Xylenes(BTEX) and Methyl-tertiary-Butyl Ether <br /> (MtBE) using EPA test method 8020/602. The October samples were additionally <br /> analyzed for oxygenated compounds using EPA test method 8260 at the request of <br /> Steve Sasson from San Joaquin County Public Health Services. <br /> k4, <br /> The submersible pump was cleaned with a solution of Liqui-nox and water prior to <br /> purging each well to minimize the potential for cross-contamination. In addition, <br />