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f <br /> Y <br /> KWISS ASSOCLA MS ,i <br /> Lisa Marinaro <br /> March 2, 1989 3 <br /> r <br /> organic free boiled distilled water, supplied by the laboratory, accompanied the samples to <br /> provide quality assurance that contamination was not introduced during sample bottle <br /> transport and sample storage. The water sampling collection records, including depth to <br /> ground water data, and chain of custody forms are included in Attachments A and I3, <br /> respectively. <br /> GROUND WATER GRADIENT <br /> Water levels for all monitoring wells were measured on 16 December 1988 and ground <br /> water elevations arc presented in Table 1. Ground water contours, plotted on Figure 2, <br /> indicate a northeasterly gradient. <br /> TABLE I. Ground Water Elevation Data, 16 December 1988,Chevron Service Station#96465, <br /> Stockton, California <br /> Top-of-Casing Depth to Ground Water <br /> Elevation Water Elevation <br /> Well ID (ft above msl) (ft) (ft relative to rnsl) <br /> MW-1 7.86 '30.33 <-22.47 <br /> MW-2 7.99 31.44 -23.45 <br /> MW-3 8.49 x30.03 a-21.54 <br /> MW-4 7.75 30.81 -23.06 <br /> MW-5 7.72 30.66 -22.94 <br /> MW-6 8.10 31.76 -23.66 <br /> MW-7 3.69 32.24 -23.55 <br /> CHEMICAL ANALYSES <br /> The ground water samples were analyzed for total fuel hydrocarbons (TFIIC) and <br /> benzene, ethyibenzene, toluene, and xylene (BETX) by Fuel Fingerprint Analysis - EPA <br /> Method 524.2/8240. Ground water samples from monitoring well MW-7 next to the waste oil <br /> tank were also analyzed for semi-volatile organic compounds by EPA Mcthod 625/8270. The <br /> results of the water analysis arc tabulated in Table 2 and the analytic reports arc included as <br /> Attachment C. <br /> 4� <br />