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Table 1 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 ms]) (pg1L) (pgli-) (pg1L) (pg/L) (pg1L) (pg/L) (pg/L) (mg1L) MW-7 9/12/2001 -- 14.16 42.00 -27.84 <50 - <2[4] <2[4] <2[4] <2[4] <2[2] - 12/12/2001 -- 14.16 38.85 -24.69 <50 - <1.0[4] <1,0[4] <1.0[4] <1.0[4] <0.50(2] -- 3/13/2002 14.16 35.93 -21.77 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 6/18/2002 - 14.96 38.18 -24.02 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] - 9/11/2002 -- 14.16 43.28 -29.12 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 12/18/2002 -- 14.16 40.70 -26.54 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 03/06/2003 P 14.16 38.31 -24.15 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2) 4.56 06/11/2003 P 14.16 37.55 -23.39 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.97 09/23/2003 P 14.16 41.57 -27,41 <50 - <0.50 <0,50 <0.50 <0.50 <0.50[2] - 12/09/2003 P 14.16 40.75 -26.59 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 03/09/2004 P 14.16 38.38 -24.22 67 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.45 06/23/2004 P 14.16 43.49 -29.33 <50 -- 0.79 <0.50 <0.50 0.61 <0.50[2] 3.039 09/20/2004 P 14.16 47.29 -33.13 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.92 12/20/2004 P 14.16 43.75 -29.59 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 4.5 03/28/2005 P 14.16 1 40.65 1 -26.49 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 4.7 MW-8 11/29/1993 14.16 58.86 44.40 69 - <0.5 <0.5 <0.5 <0.5 NA - No FP,No S 3/23/1994 - 14.16 53.61 39.45 340 -- 57 66 9.3 42 NA -- No FP,No S 6/22/1994 - 14.16 53.75 39.59 <10 - <0.3 <0.3 <0.3 <0.3 NA -- No FP, No S 9/28/1994 - 94.16 57.41 43.25 <50 - <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S 12/1/1994 - 14.16 53.12 38.96 60 - 27 13 0.8 13 NA - No FP,No S 2/28/1995 -- 14.16 53.54 -39.38 <50 <0.5 1.3 <0.5 <0.5 NA - No FP,No S 5/19/1995 - 14.16 51.66 -37.50 55'" -- <0.5 <0.5 <0.5 <0.5 NA - No FP, No S 8/28/1995 - 14.16 53.34 -39.18 <50 <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S 12/7/1995 - 14.16 52.02 -37.86 <50 -- <0.5 <0.5 <0.5 <0.5 NA -- No FP, Na S 2/5/1996 -- 14.16 -- -- -- -- - -- - -- - - Not Sampled[1] 5/30/1996 14.16 - -- - -- - - - - Not Sampled[1] 7/28/1996 14.16 - - - - - - - -- Well Destroyed MW-10 11/29/1993 14.38 59.30 44.92 1,000 - <11- <3" <1' 1 NA -- No FP,No S 3/23/1994 14.38 54.36 39.98 1,300 - 6.6 6.1 1.6 3.6 NA - No FP,No S 6/22/1994 -- 14.38 54.35 39.97 1,600 -- 5 15 3.3 5.5 NA - No FP,No S 9/28/1994 -- 14.38 58.11 43.67 NA - NA NA NA NA NA - No FP,No S 9/29/1994 - -- -- 1,100 -- <0.5 <0,5 3.6 4 NA - No FP,No S Report Date:April 25, 2005 Page 15 of 23