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Table 2 Groundwater Elevation and Analytical data(ARCO) ARCO Service Station#2133 2908 West Benjamin Holt Drive , Stockton,California Well Depth Product Groundwater Groundwater Ethyl- Total Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene benzene Xylenes MtBE DO Number Sampled Notes (ft,MSL) {ft.TOC) (ft) (ft,MSLJ Change{ft) (ug/1) (ugfl) (ug11) (ug11) (ugfl) (ugflJ (mg1L) E-11 8126!1988 3.42 - -- - -- -- -- -- 11128l1988 -- - 440 380 110 460 - - 2/27/1989 - - - -- 400 250 120 820 - - 5/3011989 -- -- -- - 437 162 97 281 - - 8/22/1989 -• - -- -- -- 160 36 36 220 _ - 12/411989 - - -- - - 240 26 38 290 - - 1/411990 16.39 - -14.97 - - - - - - -- -- 211ft990 16.19 - -14.77 0.20 - - - - - -- -- 2/1511990 18.16 - -14.74 0.03 -- - - - - -- -- 212211990 16.93 - -15.51 -0.77 - - - - 3/811990 17.91 - -14.49 1.02 - 60.1 31.3 75.6 242 - -- 4/5/1990 18.17 -- -14.75 -0,26 - -- - - •- -- -• 411911990 18.25 -- -14.83 -0.08 - -- - - •_ -- 511011990 18.55 -- -15.13 -0.30 - - -- - -- - -- 512411990 18.50 -- -15.08 0.05 - - -- -- -- - -- 6/5/1990 18.47 -- -15.05 0.03 -- - -- -- - •- - 611911990 19.20 - -15.78 -0.73 -- 135 16,6 20 114 -• 7112/1990 19.30 - -15.88 -0.11) -- - - - -• •• 8116!1990 19.65 - -16.23 -0.35 - - - - _- 911711990 19.94 - -16.52 -0.29 -- -- -- - - 911911990 19.94 - -16.52 0.00 680 90 8.2 14 110 - - 1011111990 20.03 - -16.61 -0.09 - -- - - - - - 12/6/1990 18.97 -15.55 1.06 - -- -- - - - - 2112/1991 19.53 -16.11 -0.56 1,400 120 13 21 300 - - 2/2511991 19.40 -- •15.98 0.13 -- -- -- - - - - 412311991 18.56 - -15.14 0.54 400 22 <0.5 1.7 11 -- - 7116l91 22.19 -18.77 -3.63 4,100 420 35 40 360 10/8/1991 21.73 - -18,31 0.46 5.700 410 19 62 380 - •- 1122/1992 20.00 - -16.58 1,73 6.200 220 64 <14 120 -- •- 412211992 19.08 - -15.66 0.92 14,000 570 57 150 510 -- -- 7129/1992 2064, - -17.22 -1,56 21,000 790 36 280 830 - 10/2911992 21,00 - -17,58 -0.36 6.600 390 <20 68 150 -- - 1f2711993 17.68 - -14.26 3.32 51,000 830 180 390 950 - - 4l2911993 15.91 - •12.49 1.77 28,000 530 <100 156 730 - - 8/511993 17.53 -- •14.11 -162 54,000 540 <130 200 550 - - 11f1011993 17.56 •- -14.14 -0,03 30,000 290 120 95 280 -- - 3/2111994 17.20 •- -13.78 0.36 4,900 220 16 39 170 -- - 6/27/1994 17.04 -• -13.62 0.16 3,400 210 7.9 22 120 -- •• 9/29/1994 18.12 -• -14.70 -1.08 2,200 180 13 24 65 -- -- 12/811994 17.73 -• -14.31 0.39 1,800 150 7.9 25 28 - - 31811995 15.25 -- -11.83 2.48 8,600 85 <17 35 32 - - 611/1995 13.75 - -10.33 1.50 8,900 180 <17 50 71 - - 9/1111995 15.96 - -12.54 -2.21 7.500 38 <20 32 49 - - 121511995 16.34 - -12.92 -0.38 1.100 13 <8 6 5 - - 311811996 11.00 - -7.58 5.34 2,000 24 <0.5 4.3 6.5 -- - 611811996 12.05 - -8,63 -1.05 620 11 9 3.2 3.2 <5 - 912511996 14.45 -- -11.03 -2.40 400 4 <D,5 1.5 3.3 <5 -- 12t411996 13.93 -- -10.51 0.52 280 3.5 <0.5 1.4 2 <5 -• 311911997 NP 9.50 -- -6.08 443 <50 <0.5 <0.5 <0.5 <0.5 - 1.1 615!1997 NP 11.17 -- -7,75 -1.67 <50 <0.5 <0.5 <0,5 <0.5 <5 1.5 811911997 NP 12.64 - 422 -147 <50 <0.5 <0.5 <D,5 <0.5 <5 1.7 11/2511997 NP 12.85 -- -9.43 -0.21 <5O <0.5 <0.5 <0.5 <0.5 <5 - 3119/1998 NP 6.57 -3.15 6,28 <50 <O.5 <0.5 <0.5 <0.5 <5 3.2 6124/1998 NP 8.66 - .5.24 -2.09 <50 <0.5 <O.5 <0.5 <0.5 <5 1.4 9110/1998 NP 10.30 - -6.88 -1.64 <50 <D.5 <0.5 <D.5 <0.5 <5 1211711998 NP 10.36 - -6.94 -0.06 <50 <0.5 <0.5 <D,5 <0.5 <5 -- 311011999 NP 8.19 - -4.77 2.17 <50 <0,5 <0.5 <0.5 <0.5 <5 3,9 1211999 NP 10.19 -- •6.77 -2.00 <50 <0.5 <0.5 <0,5 <0.6 <5 3.6 . 911311999 NP 11.84 -- -8.42 -1.65 <50 <0.5 <0.5 <0.5 '<0.5 <5 1.9 12/16/1999 NP 11.82 -8.40 0.02 <50 <0.5 <0.5 <0.5 <0.5 <2.5 6.3 312312000 NP 7.10 -- -3.68 4.72 <50 <0.5 <0.5 <0.5 <0.5 <2.5 1.9 612112000 NP 9.35 -- -5.93 -2.25 <50 <0.5 <0.5 <0.5 <0.5 <2.5 1.5 1:l B P-AR C0121331 Ta b le s lg wta b le s 2133.xl s 13 of 24