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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 msl) (,vg1L) (pg/L) (pg/L) (pg/L) (uglL) (pg1L) (pg/L) (mg1L) Comments MW-3 2/28/1995 - 16.10 55.88 -39.78 73 -- 0.7 <0.5 <0.5 <0.5 NA - No FP, No S 5/19/1995 -- 16.10 53.94 -37.84 52'"' -- <0.5 <0.5 <0.5 <0.5 NA - No FP,No S 8/28/1995 - 16.10 55.64 -39.54 <50 - <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S 1217!1995 -- 16.10 54.30 -38.20 <50 - <0.5 <0.5 <0.5 <0.5 NA -- No FP, No S 2/5/1996 16.10 51.73 -35.63 <50 -- <0.5 <0.5 <0.5 <0.5 NA INo FP,No S 5/30/1996 - 16.10 48.79 -32.69 <50 - <0.5 <0.5 <0.5 <0.5 <3 -- No FP,No S 9/98/1996 -- 16.10 52.73 -36.63 <50 - <0.5 <0.5 <0.5 <0.5 <3 - No FP,No S 19/26/1996 -- 16.10 50.41 -34.31 <50 -- 1.9 <0.5 <0.5 <0.5 <3 - No FP,No S 3/24/1997 - 16.10 45.29 -29.19 <50 - <0.5 <0.5 <0.5 <0.5 <3 - No FP, No S 5/20/1997 -- 16.10 45.93 -29.83 <50 - <0.5 <0.5 <0.5 <0.5 <3 -- No FP,No S 8/19/1997 - 16.10 49.56 -33.46 <50 - <0.5 <0.5 <0.5 <0.5 <5 -- No FP,No S 11/19/1997 -- 16.10 47.62 -31.52 <50 -- 1.3 1.1 <0.5 0.83 <5 - 3/4/1998 - 16.10 42.95 -26.85 <50 - <0.5 <0.5 <0.5 <0.5 <5 -- No FP,No S 6/26/1998 16.10 40.67 -24.57 <50 - <0.5 <0.5 <0.5 <0.5 <5 - 9/1/1998 -- 16.10 42.50 -26.40 71.6 - <0.5 <0.5 <0.5 <0.5 <5 12/2/1998 - 16.10 39.75 -23.65 <50 - <0.5 <0.5 <0.5 <0.5 <5 -- 3/31/1999 16.10 36.17 -20.07 <50 - 0.54 <0.5 <0.5 <0,5 <5 - 6/4/1999 -- 16.10 37.56 -21.46 102 -- 0.569 <0.5 4,45 0.885 <5 - 9/2/1999 - 16.10 42.16 -26.06 <50 -- <0.5 <0.5 <0.5 <0.5 <5 -- 11/29/1999 - 16.10 40.24 -24.14 <50 - <0.5 <0.5 <0.5 <0.5 <2.5 - 3/16/2000 - 16.10 36.21 -20.11 <50 - <0.5 <0.5 <0.5 <0.5 <2.5 - 6/26/2000 -- 16.10 38.89 -22.79 . <50 - <0.5 <0.5 <0.5 <0.5 <2[2) - 9/28/2000 - 16.10 43.14 -27.04 59.3[3] -- <0.5 <0.5 <0.5 <0.5 <2[21 12/99/2000 - 16.10 38.72 -22.62 <50 -- <0.5 <0.5 <0.5 <0.5 <2.5 -- 3/15/2001 -- 16.10 36.53 -20.43 <50 - <2[4] <2[4] <2[4] <2[4) <2[2] - 6/20/2001 -- 16.10 39.90 -23.80 <50 <2[4] <2 141 <2[41 <2 14] <2[2] - 9/12/2001 -- 16.10 44.19 -28.09 <50 -- <2[4] <2 141 <2[4] <2[4] <2[21 -- 12/12/2001 - 16.10 40.90 -24.80 <50 - <1.0[4] <1.0[4] <1.0[41 <1.0[41 <0.50[2] -- 3/13/2002 16.90 38.00 -21.90 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 6/18/2002 -- 16.90 40.27 -24.17 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 9/11/2002 - 16.10 45.44 -29.34 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[21 - 12/18/2002 -- 16.10 42.67 -26.57 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[21 - 03/06/2003 P 16.10 40.35 -24.25 <50 <0.50 <0.50 <0.50 <0.50 0.68[2] 2.57 Report Date:October 21,2005 Page 8 of 24