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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station 112133 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 1%MSL) (M TOC) (ft) (ft MSL) Change(ft) (ug") {ugll) (ug") (ug/1) (ug11) (ugfl) {mglL) MW-2 1W511997 P 70.54 -- -9.39 -0.21 - - (cont.) 311911998 P 4.27 -- -3.12 8.27 310 3.6 40.5 2.4 40.5 <5 5.5 6!24!1998 6.41 » -5.26 -2.14 - -- - - - -- » 911011998 P 8.04 -- -6.89 -1.63 157 0.783 <0.5 <0,5 0.604 <5 » 12/1711998 8,12 -- -6.97 -0.08 - - - - - -- » 311011999 P 5,95 - -4.60 2.17 450 <0.5 <0.5 <0,5 <0.5 <5 6.4 6/2211999 7.98 -- -.63 -2.03 - - - - - -- 4.1 911 31 1 9 9 9 NP 9.62 - -8.47 -1.64 <50 <0.5 <0.5 <0,5 40.5 <5 1.5 1211571999 9.54 - -8.39 0,08 - - - - - » 0.6 372 312 0 0 0 P 4.86 - -3.71 4,68 450 <0.5 <0.5 40.5 40.5 <2.5 5.0 6721/2000 7.12 - -5.97 -2.26 - -- - - - - 1.9 9113/2000 NP 8.87 -- -7.72 -1.75 450 40.5 <0.5 40.5 40.5 <2.5 1.65 12115!2000 8,33 -- •7.18 0.54 - - - -- - -- 1.76 31212001 P 6,30 - -5.15 2.03 450,0 <0.500 <0.500 40.500 40.500 <2.50 4.2 511072001 6,38 -- -5.21 -0.06 - - - - - - 2.4 6!2272001 P 9.10 -- •7.95 -2.74 <50 40.50 <0.50 <50 40.50 42.5 - 1275/2001 P 8,27 -- •7.12 0.83 - - - - - - - 3/1272002 P 653 -- -5.38 1.74 <50 40.50 <0.50 <0,50 <0.50 42.5 1.43 616/2002 7,44 - -6.29 -0.91 - - - -- - - 0.67 912472002 P 9,23 - -8.08 -1.79 <50 <0.50 <0.50 40.50 40.50 3.0 0.24 12117@002 7,23 - -6.00 2.00 - - - - - - - 3118/2003 P 7,43 - -6.26 -0.20 <50 <0.50 <0.50 <0,50 <0.50 42.5 1.28 6117/2003 7,66 - -6.51 -0.23 - - - - - - 0.10 9124103 a P 9,41 - -8.26 -1.75 450 40.50 <0.50 <0.50 <0.50 3.8 0.47 1211812003 8.79 -7.64 0.62 - - - - - - _ 3117/2004 P 6,66 -5.53 2.11 450 40.50 40.50 40.50 40.60 0.6 6122!2004 8.67 -- -7.52 -1.99 -- - - - - - - 912112004 9.66 - -8.51 -0.99 -- - - -- - - - MW-3 318!1995 2.31 14.18 » -11.87 -- <50 <0,5 40.5 40.5 40.5 - - 611/1995 12.55 - -1024 1.63 <50 40.5 40.5 40.5 40.5 -- - 911111995 14.84 •- -12.53 -2.29 <50 40,5 40.5 40.5 40.5 - - 121511995 15.20 -- -12.89 -0.36 - -- - -- - •- - 311811996 10.75 -• •8.44 4.45 <50 <0.5 40.5 40.5 40,5 - -- 6l1811995 11.05 - -8.74 -0.30 •• -- - - -• - 912511996 13.51 - -17.20 -2.46 <50 <M <0.5 40.5 <0.5 <5 - 121411996 12.82 - -10.51 0.69 - - » •- - -- 3/1911997 P 8,40 - •-6.09 4.42 <50 <0.5 <0.5 <0.5 <0,5 - 0.3 615!7997 10.10 - -7.79 -1.70 -- - - -- - - 0.2 &1911997 NP 11.55 - -9.24 -1.45 <50 40.5 <0.5 <0.5 <05 <5 0.2 1112511997 P 11.71 - -9.40 -0.16 - - - - - - - ,311911998 P 5,41 - -3.10 6.30 <50 40.5 40.5 <0.5 40,5 <5 6.9 612411996 7,49 - -5.18 -2.08 - - - - - - - 911 011 99 8 P 9.17 - •6-66 -1.68 - - - - - - NO 12!1711998 9.23 - -6.92 -0.06 - - - - - -• - 311 011 99 9 P 7.01 - 4.70 2.22 450 0.555 1.71 <0.5 0.931 <5 3.0 6/2211999 9.02 - -6.71 -2.01 - -• - - - - 3-8 911 311 99 9 NP 10.54 » -8.23 -1.52 450 40.5 <0.5 40.5 40.5 <5 2.3 12115/1999 10.60 - -8.29 -0.06 - - - - - _- 4.5 38312000 P 5.95 -- -3.64 4.65 <50 <0.5 0.552 40.5 1.18 42,5 1,6 68112000 820 - -5.89 -2.25 - •- - » -- - 0.6 9/1312000 NP 9.97 - -7.66 -1.77 450 <0.5 40.5 40.5 <0.5 42,5 1.70 12115/2000 9,43 - -7.12 0.54 - - -- - - - 0.94 31212001 P 7.32 •• •5-01 2.11 450.0 <0.500 0,840 <0.500 1.14 42,60 41 51108001 7.69 - -5.35 -0-37 - - - - - -- 2.4 88212001 P 10.21 - -7.90 -2.52 <50 <0.50 <0.50 40.50 40,50 42.5 - 12J5/20011 P 30 - - .99 0.91 - _ - - - _ _ 311 212 00 2 P TZ58 •55.27 1.72 450 40.50 40.50 40.50 c0,50 42.5 0.84 61612002 8.54 -66.23 -0.98 - 0.69 912480W P 10.39 - -8.08 -1.85 450 40.50 <0.50 <0.50 40.50 <2.5 0.50 1211712002 8,48 - -6.17 1.91 - - -- - - _ I lProjectslAR C 08133,rra bl a sfg wta b le s 213 3.xts � 22 of 24