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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 msl) (IrgIL) (pgIL) WL) (pglL) (IigIL). (NgIL) (pglL) (mglL) Comments MW-6 9/1/1998 14.55 41.09 -26.46 205 -- 0.684 <0,5 <0.5 <0.5 <5 - 12l2J1998 14.55'-. 38.42 .:._23.87 1.24: -..:.. <0,5 <0.5 <0.5 a0.5 <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 -- 9/2/1999 -- 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 -22.80 191 - 1.29 <0.5 <0.5 <0.5 <2[2] -- 9/28/2000 -- 14.55 41.61 -27.06 <50 - 2.5 <0.5 <0.5 <0.5 <2[2] - 12/19/2000 -- 14.55 37.39 -22.84 <50 - 1.56 <0.5 <0.5 <0.5 <2.5 - 3/95/2001 14.55 35.14 -20.59 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] -- i 4 _... 6/20/2001 -- 14.55 38.35 -23.80 <50 -- <2[4], <2[4] <2[4] <214]_ <2[2]. E 9/12/2001 - 14.55 42.68 -28.13 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2) - 12/12/2001 - 14.55 39.50 -24.95 73[6] - <1.0[4] <1.0[4] <1.0[4] <1.0[4] <0.50[2] -- 3/13/2002 -- 14.55 36.63 -22.08 <50 -- <0.50 <0.50 X0.50 X0.50 <0.50[2] - 6/18/2002 - 14.55 38.74 -24.19 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 9/11/2002 - 14.55 43.84 -29.29 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 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[21 1.51 Water levels taken on 6123104 09/20/2004 P 14.55 48.08 -33.53 97 -- <0.50 <0.50 <0.50 <0.50 <0.50(2] - 12/20/2004 P 14.55 44.54 29.99 fib J - <0.50 <0.50 <0.50 <0.50 <0,50[2] 3.89 03/29/2005 P 14.55 41.51 -26.96 55 -- <0.50 <0.50 <0.50 <0.50 <0.50[21 2.4 Water levels taken on 03/28/2005 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 Report Date:April 25, 2005 Page 13 of 23