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i Table 1 PAR of 31 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Holt Or.,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) mgh E-10 312/01 P 6.19 sheen -4.93 2.06 6,830 1,770 <50.0 131 228 19,600 (cont.) 5110101 P 6.62 - -5.36 -0.43 4,500 87.9 22.9 72.1 354 2,760 E-11 8/26/88 3.42 -- -- -- .. __ 11/28/88 -- -- - 440 380 110 460 2127/89 -- 400 250 120 820 - 5/30/89 -- 437 162 97 281 8/22/89 - -- -- 160 36 38 220 12/4/89 -- -- -- 240 26 38 290 1/4190 18.39 - -14.97 -- -- -- -- 2/1190 18.19 -14.77 0.20 -- -- _ 2115/90 18.16 -14.74 0.03 - -- - - 2/22190 1 B.93 - -15.51 .0.77 .- -- __ .- 318/90 17.91 -14.49 1.02 -- 80.1 31.3 75.6 242 - 4/5/90 18.17 -14.75 -0.26 - -- -- -- -- 4119/90 18.25 -- -14.83 -0.08 5/10/90 18.55 -15.13 -0.30 5124/90 18.50 -15.08 0.05 -- 6/5/90 18.47 -- -15.05 0.03 -- -- -- 6/19/90 19.20 - -15.78 -0.73 - 135 16.6 20 11 i 7/12/90 19.30 -- -15.88 .0.10 -- -- 8/16190 19.65 -16.23 -0.35 - -- 9/17/90 19.94 -16.52 -0.29 -- -- -- .. 9119/90 19.94 -16.52 0.00 680 90 8.2 14 110 10/11/90 20.03 -16.61 -0.09 -- -- -- -- -- 12/6190 18.97 - -15.55 1.06 -- -- -- .- 2112191 19.53 -16.11 -0.56 1,400 120 13 21 300 2/25/91 19.40 -15.98 0.13 -- -- -- -- 4/23191 18.56 - -15.14 0.84 400 22 <0.5 1.7 11 - 7/16/91 22.19 -18.77 -3.63 4,100 420 35 40 360 10/8/91 21.73 -18.31 0.46 5,700 410 19 62 380 - 1/22/92 20.00 -- -16.58 1.73 6,200 220 64 <14 120 -- -- 4/22192 19.08 -- -15.66 0.92 14,000 570 57 150 510 7/29/92 20.64 -17.22 -1.56 21,000 790 36 280 830 10/29/92 21.00 - -17.58 -0.36 6,600 390 <20 68 150 1/27/93 17.68 - -14.26 3.32 51,000 830 180 390 950 -- 4/29/93 15.91 -12.49 1.77 28,000 530 <100 156 730