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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 P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (pg/L) (pg1L) (pglL) (pg/L) (pg/L) (mg1L) Comments MW-4 03/28/2005 P 14.57 41.50 -26.93 <50 - <0.50 <0.50 <0.50 <0.50 1.7[2] 4.60 06119/2005 P 14.57 41.55 -26.98 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.80 10911112005 P 14.57 45.77 -31.20 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.80 MW-5 8/10/1992 1 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 5 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!411992 - 15.10 63.67 -48.77 NA -- NA NA NA NA NA - No FP,No S 112011993 - 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 7/30/9993 -- 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 PP, 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 2/28/1995 -- 15.10 54.78 -39.68 310 - 70 1.4 5.9 5 NA -- No FP,No S 5/19/1995 - 15.10 52.85 -37.75 66 -- 8.4 <0.5 0.5 <0.5 NA - No FP,No S 8/28/1995 -- 15.10 54.61 -39.51 130 - 27 <0.5 4.5 0.6 NA ~ No FP,No S 12!7!1995 -- 15.10 53.20 -38.10 <200** - 2.1 <0.5 0.7 <0.5 NA -- No FP,No S 2/5/1996 - 15.10 50.67 -35.57 <200** - 3 <0.5 0.9 <0.5 NA - No FP,No S 5130!1996 -- 15.10 47.70 -32.60 140"' - 15 <0.5 5.2 <0.5 <4** -- No FP,No S 9/18/1996 - 15.10 51.56 -36.46 <300'** - 33 <0.5 9 <0.5 <3 - No FP,No S 11/26/1996 - 15.10 49.34 -34.24 <200**' - 1.9 <0.5 0.5 <0.5 <4** - No FP, No S 3/24/1997 -- 15.10 44.24 -29.14 <200*** - 3.2 <0.5 1.6 3 <8** No FP,No S 5/20/1997 -- 15.10 44.85 -29.75 270 -- 31 5 5 15 <20'* -- No FP,No S 8/19/1997 - 15.10 48.37 -33.27 100 - 20 <0,5 3.8 <0.5 <5 -- No FP,No S Report Date:October 21,2005 Page 11 of 2a