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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station 92133 • 2908 Benjamin Halt Drive Stockton,California 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) (ry) (ft,MSL) Change(ft) WWI) (ugn) Jug/I) (ug/0 (ugll) (uglq (mg1L) E-3 9/1111995 15.91 - -12.72 -2.33 29,000 1,900 <50 640 1,900 -- - (cont.) 121511995 15.22 - -12.93 -0.21 - - _ - _ -- - 311811996 10,40 - -8.11 4.62 15,000 480 12 390 660 .. .. 6118/1996 11,05 - -876 -0.65 - - - -- - _ » 9/25/1996 13,52 - •11.23 -2.47 7,600 160 <5 160 30D <50 » 121411996 12.93 - -10.64 D.59 - - - _ _ _ 311971997 P 6.37 -- •6.08 4.56 4,400 46 6 46 99 - D.2 61511997 P 10.06 -- 4.77 •1.69 - -- -- - _ _ 0.2 811911997 P 11.53 -- -9.24 •1.47 3,900 50 10 41 28 <50 0.1 11/2511997 P 11.70 - -9.41 -0.17 -- - - - _ .- » 312011998 P 5.40 - -3.1 t 6.30 <50 <0.50 <0.50 <0.50 <0 50 <5.0 2.0 612411996 7.42 - -5.13 -2.02 -- -- - - _ -- » 9/10M996 P 9.19 -6.90 -1.77 1,440 14.6 3.91 12.7 5.31 6.51 - 12/17/1996 9.28 -- -6.99 -0.09 - - -- -- _ - .- 311011999 P 7.01 - -4.72 2.27 900 4.54 1.68 7,63 2.45 <5.0 3.3 6/2211999 8.77 -- -6.48 -1.76 - - - - - - 3.6 9113/1999 P 10.78 - -6.49 -2.01 481 1.65 <0.50 2.44 0.1335 <5.0 1.8 12/1511999 10.64 - -6.35 0.14 - - _ _ _ » 8.4 3123/2000 P 5.95 - -3.66 4.69 889 6.09 0.987 5.36 3.05 <2.50 1.5 6121/2000 8.20 - -5.91 -2.25 -- - -- - - - 0.3 911312000 P 9.98 - -7.69 -1.78 977 4.16 0.682 5.42 1.50 3.36 1,37 12/1512000 9.46 - -7.17 0.52 - -- - - _ - 1.47 3/212001 P 7.39 - -5.10 2.07 600 2.52 1.77 2.58 4.01 3.03 2.5 511012001 7,26 - -4.97 0.13 - -- - - - -- 3.3 8@612007 P 10,22 - -7.93 -2.96 410 3�4 7.4 0.52 1.8 <2.5 - 1215/2001 9.38 -7.09 0.84 311 212 0 0 2 P 7.63 - -5,34 1.75 440' 2.1 1.2 1.5 1.3 <2.5 1.43 616!2002 8.56 - -6.27 -0.93 - - - .. - - 0.73 912412D02 P 10.49 -- -8,11 -1.84 <50 <0.50 <0.50 <0.50 <0.50 <2.5 0.61 12/1712002 8.67 -- -6.38 1.73 - -• - _ _ _ 3118r2003 P 8.56 - -6.27 0.11 <50 <0.50 <0,50 <D.50 <0.50 <Z5 1.28 6/17/2003 8.80 - -6.51 -0.24 - - - - -- -- 0.80 9124M3 P 10.70 - •8.41 -1.90 66 <0.50 <0,50 <0.50 <0.50 0-66 0.36 12/1612003 9.91 -- •7.62 0.79 - _ _ _ _ _ _ 3117/2004 P 7.82 -5.53 2.09 86.00 <0.50 <0.50 <0.50 <0.50 <0.50 6122/2004 9.83 -7.54 -2,01 -• - _ _ _ - _ 9/2112004 10.69 -8.60 -1.06 71 <0.50 <0,50 <0.5D <0.50 <0.50 - E-4 812611988 2.33 - - - _ _ 11/26/1966 2/2711969 - - - - - 753 29 123 324 5/3011989 - - - _ _ _ _ 8/2211989 - - _ - - 570 125 44 64 12/4/1989 - - .. _ _ _ - - t1411990 17.38 - -15.05 - 2/111990 17.16 - -14.83 0.22 211511990 17,14 - -14.81 0.02 2!2211990 17.98 - -15.65 -0.84 31811990 16.90 - -14.57 1.08 -- 244 18.2 101 193 .. _ 41511990 17.20 - -14,67 -0.30 - -- _ _ .- _ 411911990 17.21 - -14.68 -0.01 5/1011990 17.54 - -15,21 -0.33 5124!1990 17.49 - -15.16 0.05 61511990 IT42 - -15,09 0.07 6/1811990 18.29 - -15,96 -0.67 -- 7/72/1990 18.25 - -15.92 0.04 611871990 18.55 -16.22 30 911711990 18.90 -D-18.57 -0.35 9/1911990 18.90 -16-57 0.00 4,400 33 37 160 430 10/11/1990 18.98 - -16.65 -0.08 - - _ _ _ 121611990 18.82 - -16.49 0.16 1:1 P roje c ts1A R C 0121331Ta b l e slgwt ab le s2133.x Is 30124