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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 MtSE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (gg1L) (pglL) (,ug1L) (pglL) (pglL) (pg/L) (pglL) (mg1L) Comments MW-4 11/29/1993 - 14.57 -- -- -- -- -- -- - -- - - Well Inaccessible,No FP, No S 3/23/1994 -- 14.57 54.29 39.72 580 - 97 17 4.3 29 NA -- No FP,No S 6/22/1994 -- 14.57 54.41 39.84 1 1,700 - 930 1 4.4 52 20 NA INo FP,No S 9/28/1994 -- 14.57 58.26 43.69 610 - 73 2.2 1.3 1.8 NA INo FP,No S 12/1/1994 - 14.57 57.18 42.61 1,000 - 400 31 59 15 NA INo FP, No S 2/28/1995 -- 14.57 54.27 -39.70 <50 - 0.9 <0.5 <0.5 <0.5 NA -- No FP, No S 5/19/1995 -- 14.57 52.38 -37.81 <50 - <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S 8/28/1995 -- 14.57 54.10 -39.53 <50 - <0.5 <0.5 <0.5 <0.5 NA - No FP,No S 12/7/1995 - 14.57 52.69 -38.12 <50 -- <0.5 <0.5 <0.5 <0.5 NA -- No FP, No S 2/5/1996 - 14.57 50.12 -35.55 <50 - <0.5 <0.5 <0.5 <0.5 NA - No FP,No S 5/30/1996 - 14.57 47.21 -32.64 <50 <0.5 <0.5 <0.5 <0.5 <3 - No FP,No S 9/18/1996 - 14.57 51.80 -37.23 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP, No S 11/26/1996 - 14.57 48.84 -34.27 <50 - <0.5 <0.5 <0.5 <0.5 <3 -- No FP, No S 3/24/1997 - 14.57 43.84 -29.27 <50 -- <0.5 <0.5 <0.5 <0.5 <3 No FP, No S 5/20/1997 -- 14.57 44.34 -29.77 <50 <0.5 <0.5 <0.5 <0.5 <3 -- No FP,No S 8/19/1997 14.57 47.89 -33.32 <50 - <0.5 <0.5 <0.5 <0.5 <5 No FP,No S 11/19/1997 - 14.57 46.01 -31.44 <50 -- 1.1 0.68 <0.5 0.54 <5 - 3/4/1998 14.57 41.64 -27.07 <50 <0.5 <0.5 <0.5 <0.5 <5 -- No FP, No S 6/26/1998 14.57 39.16 -24.59 <50 - 1.41 <0.5 <0.5 <0.5 <5 9!1!1998 14.57 41.83 -27.26 <50 -- <0.5 <0.5 <0.5 <0.5 <5 12/2/1998 - 14.57 38.22 -23.65 <50 <0.5 <0.5 <0.5 <0.5 <5 - 3/31/1999 14.57 34.77 -20.20 <50 - <0.5 <0.5 <0.5 <0.5 <5 -- 6/4/1999 - 14.57 35.86 -21.29 <50 <0.5 <0.5 <0.5 <0.5 <5 9/2/1999 - 14.57 40.59 -26.02 <50 -- <0.5 <0.5 <0.5 <0.5 <5 -- 11/29/1999 -- 14.57 38.78 -24.21 <50 - <0.5 <0.5 <0.5 <0.5 <2.5 3/16/2000 -- 14.57 34.75 1 -20.18 <50 <0.5 <0.5 <0.5 <0.5 <2.5 - 6/26/2000 14.57 37.21 -22.64 <50 - <0,5 <0.5 <0.5 <0.5 <2[2] 9/28/2000 - 14.57 41.58 -27.01 <50 - <0.5 <0.5 <0.5 <0.5 <2[2] - 12/19/2000 -- 14.57 37.20 -22.63 <50 - <0.5 <0.5 <0.5 <0.5 <2.5 -- 3/15/2001 14.57 35.03 -20.46 <50 - <2[4] <2[4] <2[4] <2[4] <2[2] 6/20/2001 14.57 38.33 -23.76 <50 =_ <2[4] <2[4] <2[4] <2[4] <2[2] - 9/12/2001 14.57 42.61 -28.04 <50 <2[4] <2[4] <2[4] <2[4] <2[2] - Report Date:April 25,2005 Page 9 of 23