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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station N 2133 2908 West BenjaminH Orive Ca Stockton,Califforniais Well Depth Product Groundwater Groundwater Ethyl. Total Well Date Elevation to Water Thickness Elevation Elevation TPI-Ig Benzene Toluene benzene Xylenes MTBE DO Number Sampled Notes (ft,MSL) (ft,TOC) (it) (H,MSL) Change(ft) (ugli) (Ugfl) (ug") (ug/1) tug") (ugli) (ni E-12 1215!1995 14.88 - -12.92 -1.18 450 <0.5 <0.5 -0.5 <0.5 --{cont.) 311871996 9.18 - -7.22 5.70 450 <0.5 -0.5 -0.5 <0.5 -- - 6118/1996 9.85 - -7.89 -0.67 <50 40.5 <0.5 -0.5 3.3 13 - 9125/1996 12.23 - -10.27 -2.38 <50 <0.5 <0.5 -0.5 40.5 <5 - 12l411996 11.70 - -9.74 0.53 450 -0.5 40.5 <0.5 -0.5 <5 - 3119/1997 6.01 - -6.05 3.69 -50 <0.5 <0.5 <0.5 -0.5 - 8,3 61511997 NP 9.60 -- -7.64 •1.59 -50 40.5 <0.5 40.5 <0.5 <5 10.3 8119!1997 NP 11.07 -9.11 -1.47 -50 -0.5 <0.5 40.5 40.5 <5 6,2 1112511997 NP 11,44 -- •9.48 -0.37 <50 -0.5 40.5 <0.5 40.5 <5 -- 3119/1998 P 5.18 -- -3.22 6.26 450 -0.5 <0.5 -0.5 40.5 <5 4.8 6124/1998 NP 7.24 -- •5.28 -2.06 <50 40.5 40.5 40.5 40.5 <5 1.8 9110/1998 NP 8-83 -- -6.87 -1.59 <50 -0.5 40.5 <0.5 40.5 15 -- 1211711998 NP 8.97 -- -7.01 -0.14 <50 -0.5 40.5 <0.5 40.5 <5 -- 311011999 - 311011999 NP 6.79 _ 4.83 2.18 <50 -0.5 40.5 <0.5 <0.5 <5 3,7 612 211 9 9 9 NP 8.78 _ 6.82 -1.99 <50 -0.5 -0.5 <0.5 <0.5 <5 0.5 911311999 NP 10.43 _ -8.47 -1.65 <50 -0.5 40.5 <0.5 <C.5 <5 6.4 12!1611999 NP 10.30 _ -8.34 0.13 450 <0.5 40.5 40.5 <0.5 42.5 5.0 312312000 P 5.42 - -3.46 4.88 450 40.5 -0.5 40.5 <0.5 <2.5 -- 612112000 P 7.96 - -6.00 -2.54 450 <0.5 <0.5 40.5 <0.5 42.5 0.1 911312000 NP 9.71 - -7.75 -1.75 <50 40.5 <0.5 40.5 <0.5 42.5 1.53 1211512000 P 9.19 - -7.23 0.52 <50.0 -0.500 <0.500 -0.500 -0.500 -2.50 2.32 3/1/2001 P 7.22 - -5-26 1.97 <50.0 <0.500 0.546 <0.500 -0.500 -2.50 3.8 5!1012001 P 7.21 - -5-25 0.01 <50.0 -0.500 <0.500 <0.500 -0.500 -2.50 1.4 812212001 P 9.89 - -7.93 -2.68 <50 <D.50 -0.50 40.50 -0.50 15 - 121512001 P 9.11 - -7.15 0.78 <50 <0.50 <0.50 40.50 -0.50 4.5 0.62 3!1212002 P 7.37 = -5.41 1.74 450 <0.50 -0.50 <0.50 -0.50 42.5 1.72 6/6/2002 P 6.27 -6.31 -0.90 <50 <D.50 -0.50 40.50 -0.50 42.5 0.64 912412002 P 10.11) •8.14 -1.83 <50 <0.50 <0.50 -0.50 <0.50 42.5 0.78 1211712002 P 8.57 - -6.61 1.53 <50 <0.50 -0.50 <0.50 <0.50 <2.0 - 3)1812003 P 8.30 - -6.34 0.27 450 <0.50 -0.50 -0.50 <0.50 <2.5 1.08 6!1712003 P 8.48 - -6.52 -0.18 <50 <0.50 -0.50 -0.50 <0.50 42.5 0.30 9124103 a P 10.24 - -8.28 -1.76 <50 <0.50 -0.50 <0.50 <0.50 <0.50 1.28 1211812003 9.62 - -7.66 0.62 - - •- -- - -- -- 3M6l2004 P 7.54 -- -5.58 2.08 450 -0.50 <0.50 <0.50 <0.50 -0.50 -- 6/2212004 9.48 -7.52 -1.94 -- - - - - -- 912112004 10.51 -- -8.55 -1.03 -50 -0.50 -0.50 -0.50 -0.50 <0.50 -- 12/28/2004 9.19 -7.23 1.32 - -- -- - - -- 31812005 8.34 d.38 2.85 <50 -0.50 <0.50 <0.50 <0.50 <0.50 3.7 PR-1 W2611998 0.60 -- -- -- - _ 40.5 <0.5 <0.5 -0.5 -- -- 11128/1988 -- -- - -- 6.4 29 10.7 44.4 - -- 212711989 - - -- - -- 40.4 <D.5 <0.5 40.5 -- -- 513011989 - - -• - •• 40.5 <D.5 <0.5 <0.5 -• •- <0.5 <D.5 <0.5 -0.5 8722!1969 - - -- -- •• •• -- -0.3 40.3 40.3 0.4 12!4!1969 -- - -- - •• - -- 114/1990 16.41 -- -15.61 - •• -• - - - -- -- 2/111990 16.14 -- -15.34 0.27 - -- -- -- 2115M990 16.12 -- -15.32 0.02 -- 2122/1990 16.94 -- -16.14 -0.82 31811990 15.90 -- -15.10 1.04 -- -U.5 -0.5 40,5 <0.5 - - 41511990 16.06 - -15.26 -0.16 411911990 16.12 -- •15.32 -0.06 -- -- - - - 5110/1990 16.59 - -15.79 -D,47 - - -- -- - - - 5124/1990 16.57 •- -15.77 0.02 - -- - - - - - 61511990 -- - -- - - - - '- - - -• 40.5 <0.5 40.5 <0.5 611811990 16.95 -- -16.15 - -- -- -- 711211990 17.36 - -16.56 -0.41 -- - -- .- 8116/1990 17.62 - -16.82 -0.26 - - - - 9117/1990 17.93 - -17.13 -0.31 450 40.5 40.5 <0.5 <0.5 9119/1990 17.93 = -77.13 0.00 -50 -0.5 40.5 40.5 <0.5 10!11!1990 17.98 -17.18 -0.05 121611990 17,83 - -17.03 0.15 I:1BP-ARCO421331TablesVgwtables2133.x1s 15 of 24