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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No. 2130 7906 N. EL Dorado Street, Stockton, CA TQC Depth to Water Level Ethyl- Total Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (Wg1L) (uglL) (Ng/L) (pg/L) (x g1L) WIL) (pg/L) (mg/L) MW-1 6/18/2002 - 14.58 38,65 -24.07 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] - 9/11/2002 -- 14.58 43.73 -29.15 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 12/18/2002 - 14.58 41.15 -26.57 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 03/06/2003 P '14.58 38.84 -24.26 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 4.40 06/11/2003 P 14.58 38.12 -23.54 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.13 09/23/2003 P 14,58 42.13 -27.55 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] - 12/09/2003 P 14.58 41.18 -26.60 <50 -- <0.50 <0.50 <0.50 <0.50 <0,50[2] - Comments 03/09/2004 P 14.58 38.91 -24,33 <50 - <0.50 <0.50 <0.50 <0.50 UJ <0.50[2]----i70-7- 06123/2004 0.50[2] 2.0706/23/2004 P 14.58 43.70 -29.12 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.11 09/20/2004 P 14.58 47,84 -33.26 <50 -- <0.50 <0.50 <0.50 450 <0.50[2) 1.0 12/20/2004 P 14.58 44.46 -29.68 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 5.30 03/28/2005 P 14.58 41.25 -26,67 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 5.30 06/1912005 P 14.58 41.50 -26.92 <50 - <0.50 <0.50 <0.50 <0.50_ 1.0[2]J 5.70 09/11/2005 P 14.58 45.98 -31.40 51 -- <0.50 <0.50 <0.50 <0.50 0.75[2] 3.80 MW-2 117/1992 -- 15.19 47.11 -31.92 8,000 -- 82 <60 48 170 NA -- No FP,NoS 2!2411992 -- 15.19 61.59 -46.40 NA - NA NA NA NA NA - No FP,No S 3/31/1992 - 15.19 61.37 -46.18 NA -- NA NA NA NA NA - No FP,No S 4/21/1992 -- 15.19 61.70 46.51 1,500 - 16 <0.5 22 53 NA -- No FP, No S 5/11/1992 -- 15.19 62.36 -47,17 NA NA NA NA NA NA -- No FP,No S 6/23/1992 - 15.19 62.44 -47.25 NA NA NA NA NA NA - No FP,No S 7/8/1992 - 15.19 63.66 48.47 2,100 -- 140 3.6 27 45 NA -- No FP, No S 8/10/1992 -- 15.19 64.58 -49.39 NA -- NA NA NA NA NA - No FP,No S 9/15/1992 -- 15.19 65.22 -50.03 NA NA NA NA NA NA -- No FP, No S 90/6/1992 - 15.19 65.38 -50.'19 950 - 90 5.4 12 7.9 NA - No FP,No S 11/11/1992 - 15.19 64.69 49.50 NA - NA NA NA NA NA No FP,No S 12/4/1992 15.19 63,96 48.77 NA - NA NA NA NA NA - No FP,No S 1/20/1993 -- 15.19 62.69 -47.50 1,400 - 41 <2.5 24 6.4 NA -- No FP,No S 3/22/1993 - 15.19 60.79 -45.60 NA - NA NA NA NA NA -- No FP,No S 416!1993 - 15.19 60.27 -45.08 1,000 - 7.1 <2.5 31 8.8 NA - No FP,No S 7/30/1993 15.19 60.98 -45.79 1,200 -- 35 2.6 30 15 NA -- No FP, No S 11/29/1993 -- 15.19 60.05 -44.86 11100 - 28 3.3 18 4.5 NA - No FP,No S 3/23/1994 - 15.19 55.14 -39.95 1,200 -- 14 7.7 6.9 5.2 NA -- No FP,No S 6/22/1994 -- 15.19 55.22 -40.03 1,200 - 54 15 13 5.8 NA - No FP,No S Report Date:October 21,2005 Page 5 of 24