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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station#2133 2908 Benjamin Holt 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 (ft,MSL) (ft,TOC) (K) (it MSL) Change(ft) (ug") (ugn) lugll) lug/1) (u011) (ug11) (r11glL) E-12 17/511995 14.88 - -12.92 -1.18 <50 <0.5 <0.5 40.5 40.5 (cont.) 3)1811996 9.18 - -7.22 5,70 <50 <0.5 40.5 40,5 <0.5 - 611811996 9.85 - -7.89 -0.67 <50 <0.5 40.5 40,5 3.3 13 - 912511996 12.23 - -10.27 -2.38 <60 40.5 40.5 40,5 <0.5 <5 - 121411996 11.70 - -9.74 0.53 450 '0.5 40.5 405 <0.5 <5 - 311911997 8.01 - -6.D5 3.69 <50 <D.5 40.5 <D.5 40.5 - 6.3 6/5/1997 NP 9.60 -- -7.64 -1.59 <50 <0,5 40.8 40,5 <0.5 <5 10.3 811911997 NP 11.07 -- -9.11 -1,47 <50 <0,5 40.6 40,5 40.5 <5 6,2 11/2511997 NP 11.44 - -9.48 -0.37 <50 <0,5 40.5 40.5 <0.5 <5 - 311911998 P 5.18 - -3.22 6.26 <50 <0.5 <0.5 40.5 <0.5 <5 4.8 i 6124/1998 NP 7.24 - -5.28 -2,06 <50 <0.5 <0.5 40.5 40.5 <5 1.8 9/10/1998 NP 8.83 - -6V .1 59 <50 <0.5 <0.5 40.5 <0.5 <5 - 1211711998 NP 8.97 - -7.01 -0.14 <50 <0,5 40.5 40.5 <0.5 45 - 311011999 NP 6.79 - -483 2.18 <50 <0.5 40.5 40.5 40.5 <5 3.7 612211999 NP 8.78 - -6,82 •1.99 <50 <0.5 <0.5 <0.5 40.5 <$ 05 911311999 NP 10.43 - -8.47 •1.65 450 <0.5 <0.5 <0.5 40.5 <5 6-4 12/1611999 NP 10.30 - -8,34 0.13 '50 <0.5 <0.5 <0.5 40.5 <2.5 5.0 3123/2000 P 542 - -3,46 4.13B 450 40.5 <0.5 <0.5 40.5 <2.5 - 6/2112000 P 7,96 - -6,00 -2.54 '50 40.5 <0.5 <0.5 40.5 <2.5 0.1 9/13/2000 NP 9.71 - -7.75 -1.75 450 40.5 <0.5 <0.5 40.5 <2.5 1.53 1211512DOD P 9.19 - -7.23 0.52 <50.0 '0.500 <0.500 <0.5DD <0.500 <2.50 2.32 311/2001 P 7,22 - -5.26 1.97 <50.0 '0,500 0.546 <0.500 <0.500 <2.50 3.8 5110/2001 P 721 - 5.25 0.01 <50.0 <0,500 '0.500 <0.500 <0.500 '2.50 1.4 1212001• P 9,89 - -7.93 -2.68 450 <0.50 '0.50 -0.50 <D.50 15 - 1215120D1 P 9,11 = -7.15 0.78 450 '0.50 'D.50 '0.50 40.50 <2.5 0.62 3/12/2002 P 7.37 •5.41 1.74 <50 <0.50 40.50 '0.50 <0.50 42.5 1.72 6/612002 P 827 - •6.31 -0.90 450 <0.50 <0,50 '0.50 '0.50 42.5 0-64 9/24/2002 P 10.10 - •8.14 -1.83 450 <0.50 <0,50 '0.50 <0.50 4.5 0.78 1211712002 P 8.57 - •6.61 1.53 450 <0.50 <0.50 '0.50 <0.50 4.0 - 3/18/2003 P 8.30 - -6.34 0.27 <50 <0.50 <0.50 '0.50 <0.50 4.5 1.08 6/17/2003 P 8,46 - -6.52 -0.18 <50 <0.50 <0.50 '0.50 <0.50 42.5 0.30 9124103 a P 10.24 - •8.28 -1.76 450 <0.50 '0.50 '0.50 <0.50 <0.50 128 12/18/2003 9.62 - -7.66 0.82 - 311612004 P 7.54 - -5.58 2,08 450 <0.50 '0.50 '0.50 '0.50 '0.50 - 6122/2004 9.48 - -7.52 -1.94 - - - - -- _ _ 912112004 10-51 - 4.55 •1.03 <60 <0.50 <0.50 <0.50 <0.50 <6.50 - PR-1 812611998 0.80 - - - -- - <0.5 <0.5 40.5 <0.5 _ _ 11/28/1988 - - - » 6.4 29 10.7 44.4 - - 2/27/1989 - - - - -. 40.4 <0.5 <0.5 40.5 - - W3011989 - - - - - <0.5 <0.5 <0.5 40.5 - - 812211989 -- - - - _ <0.5 40.5 <0.5 <0.5 - - 1214/1989 - - - - - <03 40.3 <0.3 0.4 - _ 114/1990 16.41 -- -15-61 - - •- - - _ 21111990 16.14 -• -15.34 0.27 211511990 16.12 - -15.32 0.02 2122/1990 16.94 - -16.14 -0.62 3/8/1990 15.90 - -15.10 1.04 -- <0.5 40.5 <0.5 <0.5 415/1990 16.06 - •15.28 4.16 4/1911990 16.12 - •15.32 .0.08 511011990 16.59 - -15.79 -0.47 5/2411990 16.57 - -1577 0.02 6/5/1990 - - - - 6118/1990 16.95 - -16.15 - - <0.5 40.5 <0.5 <0.5 711211990 17.36 -- -16.56 -0.41 - 8116!1990 17.62 -16.62 -0.26 - •• - - _ _ _ 9117/1990 17.93 = .17.13 -0.31 450 <0.5 40.5 40.5 40.5 _ 9119!1990 17.93 -17.13 0.00 450 40.5 40.5 40.5 40.5 10/1111990 17.98 -17.18 -0.05 121WI990 17.83 -- -17.03 0,15 - -- 211111991 17.53 » -16.73 0,30 450 40.5 <D,5 <0.5 40.5 I:]P rojeCt51ARCO/2133/Tabl etlgwta b les2l 33.xl s 15 of 24