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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station#2133 2908 Benjamin Holt Drive Stockton,Calitomia Well Depth Product Groundwater Groundwater Ethyl- Xylenes Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (it,MSL) (%TOC) (fl) (1t,MSL) Change(R) (ugll) (uglq lug") (ug") (ug/1) Won) (mg1L) E-11 6121/2000 NP 9.35 - -5.93 -2.25 <50 <0.5 <0.5 <0.5 -0.5 <2.5 1.5 (cont.) 9113Y20DO NP 11.11 - -7.69 -1.76 <50 <0.5 <0.5 <0.5 40.5 Q.5 1.31 1211512000 P 10.58 - -7.16 0.53 <50.0 -0.500 <0.500 -0.500 -0.500 -2.50 1.17 31112001 P 8.46 - -5.04 2.12 64.4 0.865 0.717 -0.500 1.73 <2.50 3.3 5/1012001 P 8.63 - -5.21 -0.17 <50.0 -0.500 <0.500 -0,500 -0.500 <2.50 1.8 6/22/2001 P 11.33 - -7.91 -2.70 <50 -0.50 -0.50 -0.50 -0.50 <2.5 - 12/512001 P 10.45 - -7.03 0.88 <50 <0.50 -0.50 -0.50 -0.50 <2.5 0.44 3/11/2002 P 8.72 - -5.30 1.73 <50 -0.50 -0.50 -0.50 -0.50 <2.5 1.38 6WO02 P 9.67 - -0.25 -0.95 <50 <0.50 <0.5D <0.50 -0.50 <2.5 0.37 M412002 P 11.46 - -8.04 -1.79 <50 -0.50 <0.50 -0.50 -0.50 <2.5 0.44 1211712002 P 9.60 - -0.38 1.66 <50 -0.50 <0.50 <0.50 -0.50 <2.0 - 3/1812DO3 P 9.67 - -6.25 0.13 <50 -0,50 <0.50 <0.50 -0.50 <2.5 1.16 6/17/2003 P 9.90 - -6.48 -0.23 <50 <0,50 -0.50 <0.50 -0.50 <2.5 0.10 9124103a P 11.65 - -6.23 -1.75 <50 <050 -0.50 <0.50 -0.50 -0.50 0.63 12/1812003 10.98 -- -7.56 0.87 - - - - - -- » 3/16/2004 P 8,91 -- -5.49 2,07 <50 <0.50 -0.50 -050 <0.50 -0.50 -- 6122/2004 10,88 - -7.46 -1.97 - -- - - _ __ -- 9121/2004 11.95 - -8,53 -1.07 <50 <0.50 -0.50 -0.50 <0,50 <0.50 -- E-12 8126/1988 1.96 - - » - _ - 11/28/1988 - - - - 80 30 8 35 - - 212711989 - - .. - - 121 3.4 2.2 38 - - 513011989 - - - - - 38.4 1.9 1.6 13.1 - - 812211989 - - -- - - 150 2.2 2.3 13,6 - - 121411969 -- - - 250 54 <D.3 91 - 0 - _ -- 114/1990 16.96 -1502 _ 2/1/1990 16.73 - -1477 0.25 - 2115/1990 16.69 -- -1473 0.04 - 2122/1990 17.56 - -15.60 -0.87 - 31811990 16.47 - -14.51 1.09 - 91.7 16,4 3 14.5 - » 41511990 16.64 - -14.68 -0.17 - - - _ _ 4/19/1990 16-66 - -14.70 -0.02 - 5/1011990 -- - -- _ _ 5/2411990 17.05 - -15.09 -- 6/5/1990 17.03 - -15.07 0.02 611911990 17.80 - -15.84 -0.77 -- 151 4.7 2.9 7.6 - - 7/1211990 17.67 - -15.91 -0.07 -. _ _ _ 6/1611990 - -- - - 9/1711990 18.48 -- -16.52 - 911911990 1848 - -16.52 0,00 1,100 180 2.9 9,8 32 - - 10/1111990 18.57 - -16.61 -0.09 - - - - - 12!6/1990 18.43 -- -16.47 0.14 - -- -- _ - 2112/1991 18.10 - -16.14 0.33 500 21 5.8 12 20 - - 212511991 18.08 - -16.12 0.02 - -- - _ _ 4/2311991 17.10 - -15.14 0.98 <50 6.9 <0.5 -0.5 <0.5 - - 7116191 19.74 - -17.78 -264 320 11 <0.5 -0.5 09 - -- 10/8/1991 20.29 - -18,33 -0.55 210 4.5 <0.5 <0.5 <1.0 - » 1/22/1992 18.56 - -16,60 1.73 630 2.9 1.3 -2,5 D.8 - » 4/2211992 17,69 - -15.73 0.87 660 4.3 <3.2 0.9 2.1 _ _ 7/2911992 19.18 - -17.22 -1.49 630 18 2.9 2.7 5.4 _ _ 10129/1992 19.55 - -17.59 .0.37 400 6.7 <0.5 1.3 2.7 - _ 1/2711993 16.26 - -14.30 3.29 380 1.5 2.5 1.2 <1 - 4129/1993 14.43 - -12.47 1.63 520 2.7 <2 <1 <2 8/511993 16.08 - -14.12 -1.65 830 0.6 <0,5 1.6 2.2 11/1011993 16.22 -- -14.26 -0.14 260 <0.7 2.7 <2.4 1.7 312111994 15.77 - -13.81 0.45 200 2,0 1.2 1.8 6.1 6/2711994 15.60 - -13.64 0-17 220 0,8 <0,3 0.3 <0.5 9/29/1994 16-68 - -14.72 -1.08 330 <0.5 <0,5 -0.5 0.8 _ 1218/1994 16.28 -14.30 0.42 150 <0.5 1.0 1.17 2.1 31811995 13.80 - -11.84 2,46 200 <0.5 <1 -0.5 1.8 6/1/1995 12.32 - -10.36 1-48 -50 <0.5 <D.5 <O.5 4.5 9/1111995 13.70 - -11.74 -1.38 <50 <0.5 <0.5 <0.5 <0.5 -- _ I:IProject$fA RC012133f f ables/gwtable s2133.M Is 14 of 24