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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 K[4] thyl- Total Well Date TNP (feet evation Water Elevation TPHg TPHd Benzene nzene Xylenes MtBE DO Number Sampled msl) (feet bgs) (feet msl) (pg/L) (pg/L) (erg/L) pg/L) (pg/L) (pg1L) (mg/L) Comments <50 1.56 <0.5 <0.5 <2.5 MW-6 12/19/2000 -- 14.55 37.39 -22.84 - 3/15/2001 - 14.55 35.14 -20.59 <50 <2[4] 2[4] <2[4] <2[2] -- 6/20/2001 - 14.55 38.35 -23.80 <50 - <2[4] <2[4] <2[4] <2[4] <2[2] -- 9/12/2001 - 14.55 42.68 -28.13 <50 - <2[4] <2[4] <2[4] <2[4] <2[2] -- <1.0[4] <1.0[4] 51.0[4] <1.0[4] <0.50[2] 12/12/2001 - 14.55 39.50 -24.95 73[6] - -- 3/13/2002 14.55 36.63 -22.08 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 6/18/2002 14.55 38.74 -24.19 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] 9/11/2002 -- 14,55 43.84 -29.29 -- - 12/18/2002 - 14.55 41.32 -26.77 71 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 03/06/2003 P 14.55 39.00 -24.45 200 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.47 06/11/2003 P 14.55 38.07 -23.52 53 R - <0.50 <0.50 <0.50 <0.50 <0.50[2) 4.27 09/23/2003 P 14.55 42.05 -27.50 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 12/09/2003 P 14.55 41.37 -26.82 180 - <1.0 <1.0 <1.0 <1.0 9.1[2) 03/09/2004 P 14.55 39.10 -24.55 64 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.44 06/24/2004 P 14.55 43.92 -29.37 57 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.51 Water levels taken on 6/23104 09/20/2004 P 14.55 48.08 -33.53 97 - <0.50 50.50 <0.50 <0.50 <0.50[2] -- 12/20/2004 P 14.55 44.54 -29.99 681 - <0.50 <0.50 <0.50 <0.50 <0.50[2) 3.89 03/29/2005 P i 14.55 41.51 -26.96 55 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.40 Water levels taken on 03/28/2005 06119/2005 P 14.55 41.82 -27.27 65-J -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 2,70 09/11/2005 P 14.55 46.40 -31.85 77 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.30 MW-7 12/4/1992 -- -- 62.51 - 88 -- 2 <0.5 <0.5 <0.5 NA - No FP,No S 1/20/1993 -- 14.16 60.95 46.79 NA - NA NA NA NA NA -- No FP,No S 1/29/1993 -- - -- - 67 - <0.5 <0.5 <0.5 <0.5 NA -- No FP.No S 3/22/1993 - 14.16 59.36 45.20 NA -- NA NA NA NA NA -- No FP,No S 4/6/1993 -- 14.16 58.84 44.68 <50 -- <6*' <0.5 <0.5 <0.5 NA - No FP,No S 7/30/1993 -- 14.16 59.63 45.47 <50 -- <0,5 <0.5 <0.5 <0.5 NA -- No FP,No S 11/29/1993 -- 14.16 58.62 44.46 <50 - <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S 3/23/1994 14.16 53.65 39.49 130 -- 8.8 11 1.7 8.3 NA - No FP,No S 6/22/1994 -- 14.16 53.88 39.72 <10 - <0.3 0.4 <0.3 <0.5 NA - No FP,No S 972811994 - 14.16 57.59 43.43 <50 - 1.2 1.1 <0.5 <0.5 NA - No FP,No S 12/1/1994 - 14.16 56.fi5 42.49 <50 - 6.9 3.5 <0.5 3.8 NA -- No FP,No S Report Date:October 21, 2005 Page 14 of 24