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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station#2133 2908 West Benlamin Holt Drive Stockton,California Well Depth Product Groundwater Groundwater Ethyl- Total Well Date Elevation to Water Thickness Elevation Elevation TP149 Benzene Toluene benzene Xylenes MtBE DO Number Sampled Notes (R,MSLJ (fl,TOG) (ft) (ft,MSL) Change(ft) (ug11) (uglq (ug") (ugli) (ugrl) (ugfl) (mglL) 811911997 NP 10.33 - -9.18 -1.50 2,400 17 <5 <5 260 c50 0.3 MW-2 1112511997 P 10.54 - -9.39 -0,21 - - -- - -- - -- (cont.) 3119!1998 P 4.27 - -3.12 6.27 310 3.6 <0.5 2.4 -0.5 <5 5.5 6124!1998 6.41 - -5.26 -2.14 - -- -- -- - - -- 911011998 P 8.04 - -6.89 -1.63 157 0.783 <0.5 c0.5 0.604 <5 - 1211711998 8.12 - .6.97 -0.08 - - - •- - -3110/1999 P 5.95 -- -4.80 2.17 <50 -0.5 <0.5 <0.5 -0.5 <5 6.4 6122/1999 7.98 -- -6.83 -2.03 - _ _ - - - 4.1 911 311 9 99 NP 9.62 - -6.47 -1.64 <50 -0.5 <D.5 <0.5 <0.5 <5 1.5 1211571999 9.54 -- .8.39 0.08 •- - -• - -- - 0.6 312312000 P 4.86 - -3.71 4.68 <50 <0.5 <0.5 -0.5 <0.5 <2.5 5A 612112000 7.12 -- -5.97 -2.26 -- - - - - - 1.9 < .5 <0.5 <0.5 <0.5 <2.5 1.65 9!1312000 NP 8.87 -- -7.72 -1.75 50 <0 12!15!2000 8.33 -- -7.18 0.54 -- - - - -- - 176 W2120C1 P 6.30 - -5.15 2.03 -50.0 -0.500 <0.500 <0500 -0.500 -2.50 4.2 511072001 6.36 -- -5.21 -0.06 - - - -- -- -- 2.4 6122/2001 P 9.10 -- -7.95 -2.74 <50 <0.50 -0.50 <0.50 -0.50 <2.5 - 121572001 P 8.27 -- -7.12 0.83 -- - - -- - - - 311272002 P 6.53 - -5.38 1.74 <50 <0.50 -0.50 <0.50 -0.50 <2.5 1,43 61612002 7.44 - -6.29 -0.91 - - - -- -- - 0,67 912472002 P 9.23 - -8.08 -1.79 <50 <0.50 -0.50 <0.50 -0.50 3.0 0,24 12/17/2002 7.23 - -6.08 2.00 -- - - - - - - 3/18/2003 P 7.43 - -6.28 -0.20 <50 <0.50 -0.50 <0.50 <0.50 <2.5 1,26 6/17/2003 7.66 - -6.51 -0.23 -- - - -- - - 0.10 9124103 a P 9.41 - -8.26 -1.75 <50 <0.50 <D.50 -0.50 <0.5D 3.8 0,47 12/18/2003 8.79 - -7.64 0,62 - - - - •• - - 3!17!2004 P 6.68 -5.53 2.11 <50 <0.50 <D.50 <0.50 -0.50 0.6 612212004 8.67 - •7.52 -1.99 -- - - - - •- -• 912112004 9.66 - -8.51 -0.94 -- - -- -- - - •- 1212812004 6.32 - -7.17 1_34 -- -- -• -- -- -- •• 31712005 5.49 4.34 2.83 <50 -D.50 <0.50 -0.50 -0.50 1.0 3.8 MW-3 31811995 2.31 14.18 -- -11.87 - <50 <0.5 <0.5 <0.5 -0.5 - -- 611l1995 12.55 -- -1024 1.63 <50 <0.5 <0.5 <6.5 -0.5 - -- 9/1111995 14.84 -- -12.53 -2.29 <50 <0.5 <0.5 <0.5 -0.5 - - 1215/1995 15.20 -- -12.89 -0.36 -- - - - - - -- c50 <0.5 <0.5 -0.5 <0.5 311Bl1996 10.75 - -8.44 4.45 - - 6/1811995 11.05 - -8.74 -0.30 - - - - - - - 912511996 13.51 - -11,20 -2.46 <50 <0.5 <0.5 <0.5 -0.5 45 - 12/411996 12.82 -- -10.51 0.69 - - - - - - - 311911997 P 8.40 -6.09 4.42 <50 <0.5 c0.5 -0.5 <0.5 - 0.3 61511997 10.10 -7.79 -1.70 -- -- -- -- - - 0.2 6119/1997 NP 11.55 - -9.24 -1.45 <50 <0.5 <0.5 c0.5 <0.5 <5 0.2 1112511997 P 11.71 - -9.40 -0.16 -- -- - -- - - - 311971998 P 5.41 - -3.10 6.30 <50 <0.5 <0.5 <0.5 <0.5 <5 6.9 6/24/1998 7.49 - ZAB -2.08 - -- •• -- -- - - 9110/1998 P 9.17 - -6.86 -1.68 - - - - -- - ND 120711998 9.23 - -6,92 -0.06 - - - - -- - - 311 011 9 99 P 7.01 - 4.70 2.22 <50 0.555 1.71 -0.5 0.931 <5 3.0 6/22/1999 9.02 - -6.71 -2.01 - - - - -- -- 3.8 911311999 NP 10.54 - -8.23 -1.52 <50 <0.5 <0.5 <0.5 -0.5 <5 2.3 1211511999 10.60 - -8.29 -0,06 - -- - - -- -- 4.5 312312000 P 5.95 - -3.64 4.65 <50 -0.5 0.552 <0.5 1.18 <2,5 1.6 612112000 8.20 - -5.89 -2.25 -• - - - - - 0.8 911312000 NP 9.97 - -7.66 -1.77 -50 <6.5 <0.5 <0,5 -0.5 <2.5 1.70 1211512000 9.43 -- -7.12 0.54 - - - - -- -- 0.94 312/2001 P 7.32 -- -5.D1 2.11 -50.0 -0.500 0.840 -0.500 1.14 -250 4.1 511012001 7. -5.38 -0.37 _ - - - _ 2-4 8!2212001 P 10.2.2 1 -7.90 -2.52 -50 -0.50 50.50 -0.50 -0.50 <2.5 12!512001 P 9.30 -6.99 0.91 311 212 0 0 2 P 7.58 -5.27 1.72 <50 <0.50 <D.50 -0.50 -0.50 <2.5 D.94 61612002 8,54 -- -6.23 -0.96 -- - -- - -• - D.69 I:IBP-ARCO121331Tableslgwtables2133.K1s 22 of 24