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Table I Groundwater Elevation and Analytical Data ARCO Service Station No. 2130 7906 N. EL Dorado Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date Pl Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pglL) (pgll-) (pg/L) (pg/L) (pg/L) (pg/L) (pglL) (mg/L) Comments MW-4 12/12/2001 - 14.57 39.37 -24.80 <50 - <1.0[4] <1.0[4] <1.0[4] <1.0[4] <0.50[2] - 3/13/2002 - 14.57 36.43 -21,86 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 6/18/2002 - 14.57 38.70 -24.13 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 9/11/2002 -- 14.57 43.86 -29.29 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 12/18/2002 14.57 41.08 -26.51 <50 - <0.50 <0.50 <0.50 <0.50 <0.5012] -- 03/06/2003 P 14.57 38.79 -24.22 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.6 06/11/2003 P 14,57 38.22 -23.65 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.77 09/23/2003 P 14.57 42.25 -27,68 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 12/09/2003 P 14.57 41.09 -26.52 <50 - <0,50 <0.50 <0.50 <0.50 <0.50[2] - 03/09/2004 P 14.57 38.85 -24,28 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.49 06/23/2004 P 14.57 43.77 -29.20 <50 - 0.80 <0.50 <0.50 0.50 <0.50[2) 2.59 09/20/20041 P 1 14,57 47.95 -33.38 <50 -- <2.5 1 <2.5 1 <2.5 j <2.5 <2.5[2] 2.04 12/20/20041 P 1 14.57 43.18 -28,61 <50 11 0.66 1 <0.50 1 <0,50 <0.50 18[2] 2.74 03128/20051 P 1 14.57 41.50 -26.93 <50 -- <0.50 <0.50 <0.50 <0.50 1.7[21 4.6 MW-5 8/10/1992 - 15.10 64.84 -49.39 NA -- NA NA NA NA NA -- No FP,No S 8/28/1992 -- -- - - 380 - 61 18 2.7 48 NA -- No FP, No S 9/15/1992 - 15.10 64.95 -50.03 NA - NA NA NA NA NA - No FP, No S 10/6/1992 - 15.10 65.10 -50.19 460 - 59 34 2.1 45 NA -- No FP, No S 11!11/1992 -- 15.10 64.40 49.50 NA -- NA NA NA NA NA -- No FP,No S 12/4/1992 -- 15.10 63.67 -48.77 NA - NA NA NA NA NA - No FP,No S 1/20/1993 - 15.10 62.39 -47.50 79 - 9,2 1.3 <0.5 4.2 NA - No FP,No S 3/22/1993 - 15.10 60.51 -45.60 NA -- NA NA NA NA NA -- No FP,No S 4/6/1993 -- 15.10 60,01 -45.08 1,600 - 260 150 12 230 NA -- No FP,No S 7/30/1993 -- 15.10 60.75 -45.79 790 160 88 19 71 NA - No FP, No S 11/29/1993 15.10 59.77 -44,86 9,600 - 1,900 870 140 1,300 NA - No FP, No S 3/23/1994 -- 15.10 -- -- -- - -- - -- -- -- -- Well Inaccessible,No FP, No S 6/22/1994 - 15.10 -- - - -- - - -- -- - Well Inaccessible,No FP, No S 9/28/1994 -- 15.10 -- -- -- -- -- -- _ - -- Well Inaccessible,No FP, No S 10/11/1994 -- 15,10 58.77 43.67 89 -- 21 22 1.8 5.1 NA -- No FP,No S 12/1/1994 -- 15.10 57.70 42.60 870 - 280 23 41 87 NA - No FP, No S Report Date:April 25, 2005 Page 10 of 23