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Tab• Pageof 31 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2133 <br /> 2908 Benjamin Holt Dr.,Stockton,California <br /> Well Depth Product Groundwater Groundwater Total <br /> Date Elevation to Water thickness, Elevation Elevation change TPH-G Benzene Toluene Ethylbenzene Xylenes MtBE DO <br /> Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mgll <br /> PR-1 4/19/90 16.12 -- -15.32 -0.06 <br /> (cont.) 5/10/90 16.59 -15.79 -0.47 <br /> 5124/90 16.57 - -15.77 0.02 <br /> 615190 -- -_ <br /> 6118190 16.95 - -16.15 -- <0.5 <0.5 <0.5 <0.5 <br /> 7112/90 17.36 -16.56 -0.41 -- -- -- -- <br /> 8/16190 17.62 -16.82 -0.26 -- -- -- __ -- <br /> 9/17190 17.93 -17.13 -0.31 <50 <0.5 <0.5 <0.5 <0.5 <br /> 9/19190 17.93 -17.13 0.00 <50 <0.5 <0.5 <0.5 <0.5 - <br /> 10/11/90 17.98 -17.18 -0.05 -- -- -- -- __ _ <br /> 12/6/90 17.83 -17.03 0.15 -- -- -- __ -- <br /> 2/11/91 17.53 -16.73 0.30 <50 <0.5 <0.5 <0.5 <0.5 <br /> 2/25/91 17.47 -16.67 0.06 -- -- - -- -- <br /> 4123191 16.53 - -15.73 0.94 <50 <0.5 <0.5 <0.5 <0.5 -- <br /> 7/16/91 18.18 -17.38 -1.65 <50 <0.5 <0.5 <0.5 <0.5 -- <br /> 10/8/91 18.63 -17.83 -0.45 <50 <0.5 <0.5 <0.5 <0.5 <br /> 1/22/92 17.49 -16.69 1.14 <50 <0.5 <0.5 <0.5 <0.5 <br /> 4/22/92 16.90 - -16.10 0.59 <50 <0.5 <0.5 <0.5 <0.5 <br /> 7/29/92 18.40 -17.60 -1.50 <50 <0.5 <0.5 <0.5 <0.5 <br /> 10/29/92 18.84 - -18.04 -0.44 <50 <0.5 <0.5 <0.5 <0.5 <br /> 1/27/93 16.16 -15.36 2.68 <50 <0.5 <0.5 <0.5 <0.5 -- <br /> 4129/93 14.12 -13.32 2.04 <50 <0.5 <0.5 <0.5 <0.5 <br /> 8/5193 15.48 -14.68 -1.36 <50 <0.5 <0.5 <0.5 <0.5 <br /> 11/10/93 15.94 - -15.14 -0.46 <50 <0.5 <0.5 <0.5 <0.5 <br /> 3/21/94 14.62 -13.82 1.32 <10 <0.3 <0.3 <0.3 <0.5 -- <br /> 6/27/94 14.98 - -14.18 -0.36 <10 <0.3 <0.3 <0.3 <0.5 <br /> 9/29/94 16.09 -- -15.29 -1.11 <50 <0.5 <0.5 <0.5 <0.5 - <br /> 1218/94 15.66 -14.86 0.43 <50 <0.5 0 5 <0.5 <0.5 <0.5 <br /> 3/8/95 13.47 -12.67 2.19 <50 <0.5 <0.5 <0.5 <0.5 <br /> 611195 11.94 - -11.14 1.53 <50 <0.5 <0.5 <0.5 <0.5 <br /> 9/11/95 13.82 -13.02 -1.88 <50 <0.5 <0.5 <0.5 <0.5 <br /> 12/5/95 14.22 -13.42 -0.40 -- -- -- -- -- <br /> 3/18196 10.05 -9.25 4.17 <50 <0.5 <0.5 <0.5 <0.5 - <br /> 6/18/95 10.23 -- -9.43 -0.18 -- -- -- -- <br /> 9/25/96 12.55 -11.75 -2.32 <50 <0.5 <0.5 <0.5 <0.5 <5 - <br /> 12/4/96 12.05 -11.25 0.50 -- -- -- -- _- _ <br /> 3/19/97 NP 8.04 - -7.24 4.01 <50 <0.5 <0.5 <0.5 <0.5 0.3 <br /> 615/97 NP 9.27 -8.47 -1.23 <50 <0.5 <0.5 <0.5 <0.5 <5 0.9 <br />