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Pae 1 of 2 • TabO Groundwater Elevation and Analytical Data Former ARCO Service Station#4493 205 North Center Street Stockton,California Well Depth Groundwater Change in TPH as Ethyl- Well Date Elevation to Water Elevation Groundwater Gasoline Benzene Toluene benzene Xylenes MtBE DO Number Sampled feet,MSL feet,TOC feet,MSL feet,MSL b b b b b b m L MW-1 2/1611999 11.94 13.35 -1.41 -- 231 1.35 ND 2.37 ND NW 3/10/1999 13.01 -1.07 0,34 -- -- -- -- -- 06/17/99 11.89 0.05 1.12 <50 3.52 <0.5 <0.5 3.02 <2.02 09/24/99 --------•-----------------Well Inaccessable------------------------------ -- 12/16199 NP 14.39 -2.45 <50 2.35 <0.5 <0.5 3.02 <2.50 2.9 03128/00 P 12.12 -0.18 2.27 132 0.864 <0.5 <0.5 <0.5 <2.50 1.82 06/19/00 P 11.63 0.31 0.49 <50 0.692 <0.500 <0,500 <0.500 20.6 3.77 MW-2 2/16/1999 12.43 14.56 -2.13 -- ND ND ND ND ND NDa -- 3/10/1999 13.70 -1.27 0.86 -- -- -- -- -- 06/17/99 12.62 -0.09 1.18 <50 <0.5 <0,5 <0.5 <0.5 <2.0a 09/24/99 NP 12.24 0.19 0.28 <50 <0.5 <0.5 <0.5 <0.5 <5.0 4.2 12/16/99 NP 15.29 -2.86 -3.05 <50 <0,5 <0.5 <0.5 <0.5 <2.50 4,3 03128100 P 12.95 -0.52 2.34 52.2 <0.5 <0.5 <0.5 1.22 <2.50 2.88 06/19/00 P 12.57 -0.14 0.38 <50 <0.500 <0.500 <0.500 <0.500 <2.50 2.12 MW-3 2/16/1999 12.51 14,64 -2.13 -- ND ND ND ND ND 7.06 -- 3/10/1999 13.99 -1.48 0.65 -- -- -- -- 06/17/99 12.97 -0.46 1.02 <50 <0.5 <0.5 <0.6 2.26 144° 09/24/99 ---------------------------Well Inaocessable------------------------------ -- 12/16/99 NP 16.53 -3.02 -- <50 <0.5 <0.5 <0.5 <0.5 <2.50 4.1 03/28/00 P 13.21 -0.7 2.32 <50 <0.5 <0.5 <0.5 <0.5 246 2.24 06/19/00 P 12.79 -0.36 0.34 <50 <0.500 <0.500 <0.500 <0.500 278 1.98 MW-4 2/16/1999 12.19 14.41 -2.22 -- 15,000 503 ND 707 1,550 9,990 3/10!1999 13.61 -1.42 0.8 -- -- 6/17/1999 12.43 -0.24 1.18 10,800 230 17.7 597 936 766° -- 09/24/99 NP 12.72 -0.53 -0.29 4,880 173 <10.0 262 <10 670 4.9 12/16/99 NP 15.17 -2.98 -2.45 7,830 260 <10.0 570 113 1,310 1.9 03/28/00 P 12.83 -0.64 2.34 5,330 298 <20.0 318 443 4,960 1.00 06/19100 P 12.44 -0,25 0.39 2,860 186 <20.0 223 123 3,790 3.82 1 077.41819.0021GW Tables