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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station#2133 2908 Benjamin Holl Drive Stockton,California well Depth Product Groundwater Groundwater Ethyl- Xylenes Wall Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (ft,MSL) (ft,TOG) (ft) (1t.MSL) Change(ft) (ug/1) (ug") (u910 (ugll) 09n) (ugll) (mgrL) E-8 8!2611988 0.97 - .. -- _ - 210 4 21 76 _ _ 1112811986 - -- - -- 210 4 21 76 - - 2/27/1989 -- -. - •- - 227 2.5 5.7 47.8 - - 5/39/1989 - -- _ - 132 $.4 8.1 27.3 - - 0/22/1989 - -- _ .. 535 1.3 2 20 - - 121411989 - .. _ .. 28 1 <0.3 18 - - 1/4/1990 - 2/111990 - 211511990 - 212211990 - 3/8/1990 15.54 - -14,57 - - 38,9 3,4 2.2 15,3 - - 41511990 15.79 - -14.82 -0.25 - -- - _ _ 4/1911990 15.89 - -14.92 -0.10 - 5/10/1990 16.16 - -15.19 -0.27 - 5/24/1990 1614 - -15.17 0.02 - 615/1990 - _ _ - 611811990 16.97 - -1600 - - 147 2.9 2.4 12.7 - - 7112/1990 16.90 -- -15.93 0.07 - - _ _ 811611990 17.30 - -16.33 -0.40 - 9117/1990 17.54 -16.57 -0.24 » 9/1811990 17.54 - -16.57 0.00 140 23 <0.5 1.5 16 -- - 1011111990 17.67 - .16.70 -0.13 -- - - _ - 1216/199D - _ -- 2/1211991 18.13 - -17.16 - 1,300 110 15 17 65 -- 2125/199116.05 - -17.08 0.08 - » - _ _ - » 412314991 16.39 -15,42 1.86 310 9.3 <0.5 <0.5 0.87 7/16191 18.69 - -17,92 -2.50 200 18 <0.5 0.7 215 - -- 1018/1991 19.46 - -18,49 -0.57 <50 7.8 <0.5 <0.5 0.61 - -- 122/1992 17,69 -16.72 1.77 250 2.8 0,6 2.1 <O.5 - » 4/22/1992 16,71 -15.74 0.98 1,200 93 <2.5 3.7 5.3 - » 7/29/1992 18,21 -17.24 -1.50 690 61 1.3 5.7 6 - » 1012911992 16.62 -• -17.65 -0,41 620 87 <0.7 7.1 67 - .- 112711993 15.42 - -14.45 3.20 960 31 <1 1.9 1.6 - -- 4129/1993 13.56 -- -12.59 1.66 360 20 <42 2.2 1.7 - _ 81511993 15.28 -- -14.31 -1.72 320 12 <0,5 2.3 1,6 - -- 11110/1993 15.62 - -14.65 -0.34 310 12 2.4 1.7 1.4 - _ 312111994 15.00 - -14.03 0.62 220 0.9 1.1 1.0 1.3 - _ 6127/1994 14.79 - -13.82 0.21 400 24 2.4 4.6 2.0 - _ 9,2911994 15.76 - -14.79 -0.97 670 46 <0.5 8.9 <0.5 -- _ 1218/1994 15.37 -14.40 0.39 190 3,5 1 1.1 2.4 - •. 316/1995 12.93 - -11.96 2.44 200 13 <0.5 2.9 <0.5 » _ 611/1995 11.46 - -10.49 1.47 650 26 1 8.5 1.5 » _ 911111995 13.66 - -12.69 -2.20 370 7.4 <0.5 2.1 <0.5 •- _ 121511995 14.00 - -13,03 -0.34 150 2.8 <0.5 1.1 <0.5 -. _ 3118!1996 9.05 - -8.08 4,95 2,000 19 <0.5 9.3 13 -- _ 6118!1996 9.80 - .8.83 -0.75 2,300 41 43 18 4.9 <5 - 9125/1996 12.26 - -11.31 -2.48 2,000 31 <1 14 1.4 <10 12/411996 11.73 - -10.76 0.55 1,800 29 <5 15 <5 <50 3/1911997 NP 7.14 - -6.17 4.59 840 19 1.1 9.4 0.82 - 0.1 61511997 NP 8.82 - -7.85 .1.68 900 13 1.4 4.7 1.3 <5 0.2 811911997 NP 10.27 - -9.30 .1.45 1,000 13 4 2,4 0.84 <5 0.2 11125/1997 NP 10.47 -- -9.50 -0.20 140 <0.5 <05 <0.5 <0.5 <5 _ 311911998 NP 4.19 - -3.22 6.28 <50 <0.5 <D.5 <0.5 <0.5 <5 2,4 612411998 NP 6.22 - -5,25 -2.03 <50 <O.5 <D.5 <0.5 <0.5 5.7 1.5 911011995 NP 8.94 -- -7,07 -1.82 54.8 <0.5 <0.5 <0.5 <0.5 <5 .- 1211711998 NP 8.04 -- -7.07 0.00 <50 <0.5 <0.5 <0.5 <0.5 20.5 3/10/1999 NP 5,83 ry -4.86 221 <50 <0.5 <0.5 <0.5 <0.5 <5 -- 6/2211999 NP 7.76 -6.79 -1.93 <50 0.519 <0.5 <0.5 <0.5 <5 2.7 9/1311999 NP 9.51 -8.54 -1.75 <50 <0.5 <0.5 <0.5 <0.5 <5 2.1 12116/1999 NP 9.40 - -6.43 0,11 <50 <0.5 <0.5 <0,5 <0.5 3.07 1,8 312312000 NP 4.73 - -3.76 4.67 <50 <0.5 <0.5 <0.5 <0.5 15.4 1.2 1:1ProjectslARCO12133/Tableslgwtables2133.xis ' 9 of 24