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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 PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet ms]) (pg/L) (pgll-) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (mg/L) Comments MW-6 1/2011993 14,55 61.87 47.32 NA - NA NA NA NA NA - No FP, No S 1/29/1993 - -- - -- 120 - <0.5 <0.5 <0.5 <0.5 NA No FP,No S 3/22/1993 -- 14.55 60.28 45.73 NA - NA NA NA NA NA - No FP, No S 4/6/1993 14.55 59.74 45.19 160 - 0.6 <0.5 <0.5 <0.5 NA -- No FP,No S 7/30/1993 - 14.55 60.40 45.85 170 - <0.5 <0.5 <0.5 -50.5 NA - No FP, No S 11/29/1993 - 14.55 59.61 45.06 150 -- <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S 3/23/1994 - 14.55 54.60 40.05 270 -- 69 69 6 29 NA - No FP, No S 6/22/1994 -- 14.55 54.66 40.11 <10 -- 0.3 <0.3 <0.3 <0.5 NA No FP,No S 9/28/1994 -- 14.55 58.50 43.95 <50 -- 1.2 1 <0.5 <0.5 NA - No FP, No S 12/1/1994 - 14.55 57.46 42.91 <50 - 0.8 <0.5 <0.5 <0.5 NA No FP,No S 2/28/1995 - 14.55 54.54 -39.99 55 -- <0.5 <0.5 <0.5 <0.5 NA - No FP,No S 5/19/1995 -- 14.55 52.59 -38.04 96*** - <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S 8/28/4995 - 14.55 54.25 -39.70 120 - <0.5 <0.5 <0.5 <0.5 NA - No FP, No 5 12/7/1995 - 14.55 52.91 -38.36 <200** -- <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S 2/5/1996 - 14.55 50.39 -35.84 130 -- <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S 5/30/1996 - 14.55 47.38 -32.83 140*** - <0.5 <0.5 <0.5 <0.5 <3 - No FP,No S 9/18/1996 14.55 51.26 -36.71 <200*** -- <0.5 <0.5 <0.5 <0.5 <3 No FP,No S 11/26/1996 -- 14.55 49.01 -34.46 <200*** -- <0.5 <0.5 <0.5 <0.5 <4** -- No FP,No S 3/24/1997 14.55 43.97 -29.42 <50 - <0.5 <0.5 <0.5 <0.5 <3 - No FP, No S 5/20/1997 14.55 44.52 -29.97 180 -- <2** <0.5 <0.5 <0.5 <3 - No FP,No S 8/19/1997 - 14.55 48.12 -33.57 190 -- <0.5 <0.5 <0.5 <0.5 <5 -- No FP,No S 11/19/1997 -- 14.55 .46.26 -31.71 95 -- 3.4 2.1 1 2.5 <5 - 3/4/1998 - 14.55 41.63 -27.08 60 - 1.6 <0.5 <0.5 <0.5 <5 - No FP,No S 6/26/1998 - 14.55 39.33 -24.78 101 -- 0.734 <0.5 <0.5 <0.5 <5 - 9/1/1998 -- 14.55 41.01 -26.46 205 -- 0.684 <0.5 <0.5 <0,5 <5 - 12/2/1998 -- 14.55 38.42 -23.87 124 -- <0.5 <0.5 <0.5 <0.5 <5 -- 3/31/1999 14.55 34.84 -20.29 6.76 - 1.62 <0.5 <0.5 <0.5 <5 - 6/4/1999 - 14.55 36.06 -21.51 118 -- 1.77 <0.5 <0.5 <0.5 8.86 -- 901999 -- 14.55 40.63 -26.08 201 - 2.84 <0.5 <0.5 <0.5 14.1 -- 11/29/1999 - 14.55 38.78 -24.23 53 - 0.839 <0.5 <0.5 <0.5 <2.5 - 3/16/2000 -- 14.55 34.84 -20.29 <50 -- <0.5 <0.5 <0.5 <0.5 <2.5 -- No FP,No S 6/26/2000 - 14.55 37.35 1 -22.80 j 191 - 1.29 1 <0.5 1 <0.5 <0.5 1 <2[2] -- 9/28/2000 -- 14.55 41.61 1 -27.06 <50 -- 2.5 <0.5 <0.5 <0.5 <2[2] -- Report Date:October 21,2005 page 13 of 24