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i Table`1 Pa 1 of 31 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Holt Dr.,Stockton,California Well Depth Product Groundwater Groundwater Total Date Elevation to Water thickness, Elevation Elevation change TPH-G Benzene Toluene Ethylbenzene Xylenes MtBE DO Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mgA E-2 8/26/88 2.86 -- - -- -- -- -- 11/28/88 -- 79 4 5 12 2127189 -- - 300 7.8 9.9 47.6 5/30/89 -- 638 10.3 19.4 75.3 8/22/89 - - 85 <25 <25 <25 - 12/4/89 -- -- -- - 102 8.2 <0.6 53 1/4/90 17.90 -- -15.04 -- -- -- -- -- 2/1/90 17.70 -- -14.84 0.20 -- - 2115/90 17.67 -14.81 0.03 2/22/90 18.44 -15.58 -0.77 -- -- -- -- -- 3/8/90 17.40 -- -14.54 1.04 -- 108 24.5 15.6 33.9 4/5/90 17.69 -14.83 -0.29 -- -- -- -- - -- 4/19/90 17.72 - -14.86 -0.03 -- - - 5/10/90 18.03 - -15.17 -0.31 -- - 5/24/90 17.96 -15.10 0.07 -- -- - 615/90 17.95 -- -15.09 0.01 -- -- -- -- 6/18/90 18.86 - -16.00 -0.91 -- 63.6 8 6.3 8.8 7112190 18.76 -- -15.90 0.10 -- -- -- -- -- 8/16/90 19.05 -16.19 -0.29 9/17/90 19.40 -16.54 -0.35 -- -- -- -- -- 9119/90 19.40 -16.54 0.00 2,000 10 19 80 200 10/11/90 19.49 - -16.63 -0.09 -- -- -- -- 1216/90 19.34 -16.48 0.15 - 2/11191 19.00 -16.14 0.34 -- -- -- 2/25/91 18.93 -16.07 0.07 -- -- -- -- _- 4/23191 18.05 -- -15.19 0.88 1,300 19 <0.5 1.2 1.8 7/15/91 20.75 -17.89 -2.70 1,600 62 20 7.3 43 10/8/91 21.30 -- -18.44 -0.55 2,200 55 <2.5 3.3 6 1/22/92 19.47 -16.61 1.83 2,400 41 14 22 47 4/22/92 18.62 -- -15.76 0.85 1,200 37 2.2 3.7 6 -- 7/29/92 20.07 -17.21 -1.45 1,800 45 4.5 9.3 4.7 10/29/92 20.52 -17.66 -0.45 540 12 <0.5 2.5 1.4 - 1/27/93 17.23 - -14.37 3.29 1,900 47 9.4 75 7.0 - 4/29/93 15.43 -12.57 1.80 3,400 110 15 15 29 8/5/93 17.10 -14.24 -1.67 2,300 45 <5 12 5 11/10/93 -- -- -- -- 3/21/94 16.80 -13.94 1,000 13 8 7 6 -