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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station 02133 • 2908 Benjamin Holt Drive Stockton, California I Well Depth Product Groundwater Groundwater Ethyl- Xylenes Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (ft,MSL) (ft.TOC) (ft) (M MSE) Change(ft) WWI) WWI) (ugll) (ug") (uglq (ags) (mg)L) MW1 1111011993 1.29 15.69 -14.40 - <50 <0.5 <0.5 <0.5 <0.5 - - 321/1994 15.11 •• -13.82 0.58 00 <0.3 <0.3 <0.3 <0.5 - - V2711994 14.94 -- -13.65 0.17 <10 <0.3 <0.3 <0.3 <0.5 - - 9129/1994 16.06 -- -14.77 -1.12 <50 <0.6 <0.5 <0.5 <0.5 - - 12/811994 15.63 - -14.34 0.43 <50 <0.5 <0.5 <0.5 <0.5 -- » 3/811995 13.21 - -11.92 2.42 <50 <0.5 <0.5 <0,5 <0.5 » » 61111995 11.72 - -10.43 1.49 <50 <0,5 <0.5 <0,5 <0.5 -• » 9111/1995 13.94 - -12.65 •2.22 830 82 100 9 110 - » 12/5/1995 14.26 - -12.97 -0.32 - - - _ _ 3/18/1996 8,93 - -7.64 5.33 720 12 53 24 160 » -- 6/16/1995 9,92 - -8.63 -0.99 - - - _ _ 92511996 12.53 - •11.24 -2.61 1500 110 9.7 94 52 1 25 •- 12/411996 1200, - -10.71 0.53 - - - _ _ 311911997 P 7.45 - -6.16 4.55 <50 0.51 <0.5 <0.5 <0-5 <5 0.2 615/1997 P 9.13 - -7.84 -1.68 - •• - - - - 0.2 8/1911997 NP 10.51 - -9.22 -1.38 <50 <0.5 <0.5 <0.5 <0,5 <5 0.2 11725/1997 P 10.61 - -9.52 -0.30 - -- - _ _ -- _ 3/19/1998 P 4.60 - -3.31 6.21 c50 <0.5 <0.5 <0.5 <05 <5 2.8 624/1998 6.56 - -5.27 -1.96 _ _ -- _ _ _ -- 9110/1998 P 8.28 - -6.99 -1.72 <50 <0.5 <0.5 <0.5 <0.5 <5 » 12117/1998 8.38 - -7.09 -0.10 - - - - _ 311011999 P 6.17 - -4.88 2.21 <50 <0.5 <0.5 <0.5 <0.5 <5 2.3 612211999 8.21 - -6.92 -2.04 - - -- - - - 3.9 911311999 P 9.63 •- -6.34 -1.42 <50 <0.5 <0.5 <0.5 <0.5 4,800 1.8 12/1511999 9,61 - -8.32 0.02 - - - - - - 2.7 3/23/2000 P 5,13 -3.84 4.48 <50 <05 <0.5 <0.5 <0.5 <2.5 6.0 6/21/1000 7.35 - -6,06 -2.22 - - - - -- _ 0.4 9113/2000 P 9.12 - -7,83 -1.77 <50 <0.5 <0-5 <0,5 <0.5 117 1.55 12!1512000 8-56 - -7.27 0.56 - - -- - - -- 0.86 312/2001 P 6-65 - -5.36 1.91 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 4,6 5110/2001 6.65 - -5.36 000 - -- - _ _ - 2.3 672212001 P 9.10 - -7.81 -245 <50 <0.50 <0.50 <0.50 <0,50 16 - 12/512001 8.58 -- -7.29 0.52 - - - - __ _ _ 311212002 P 6.80 -• -5.51 1.78 <50 <0.50 <0.50 <0.50 <0.50 <2.5 1.11 6162002 7.70 - -6.41 -0.90 •• - - - - - 0.14 9124/2002 P 9.45 - -8,16 -1.15 40 <0.50 <0.50 <0.50 <0.50 3.7 0.28 12/17/2002 8.03 - -6.74 1.42 - - _ _ _ _ „ 311812003 P 7.71 - -6.42 0.32 <50 <0.50 <0.50 <0.50 <0.50 <2.5 0.96 611772003 7.91 - -0.62 -0.20 - - - - » - 0.10 824!03 a P 9.50 - -8.21 -1.59 <50 <0,50 <0,50 <0,50 <0.50 <0.50 0.79 12!162003 9.08 - -7.79 0.42 - - _ _ „ - _ 311612004 P 6.72 •5,43 2.36 <50 <0.50 <0,50 <0.50 <0.50 <0,50 -- 6122l2004 6.91 - -7.62 -2.26 - -- -- _ _ - _ 912112004 9.94 - -6.65 -0.94 <50 <0.50 0.50 <0.50 <0.50 1.3 » MW-2 1111011993 2,88 tb.89 - -14.01 - 950 67 72 6.6 120 _ 312111994 16.44 - -13.56 0.45 450 100 6.2 16 83 6/2711994 16.29 - -13.41 0.15 390 55 13 9.6 72 9129194 - - - _ - - 1218194 15.43 - -12.55 - 580 29 27 6.2 130 _ -- 318195 2.54 12.97 - -10.09 2.46 3,800 180 42 89 370 _ - 6l1195 - -• - .- _ _ _ 9111/1995 13.74 -• -11.20 - 4,100 290 51 140 170 121511995 1.15 14.10 - -12.95 -1.75 - - _ „ - 3/18/1996 8.60 - -7.45 5.50 4,800 250 16 56 280 6/1811996 9.61 - -6.46 -1.01 - - _ _ „ • 925/1996 12.20 Y -11.05 -2.59 120 2.7 <0.5 3 18 <5 = 12/411996 11.78 -10.63 0.42 311911997 P 7.33 -6,18 4.45 510 17 0.89 3.1 4.4 0-3 6/5/1997 P 8.83 - -7,68 -1.50 - - - -- -- -- 0.4 811911997 NP 10.33 - -9.18 -1.50 2,400 17 <5 <5 260 <50 0.3 1:1ProjectslARCO121337Ta bleslgwtables2133.a Is 21 of 24