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j 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 msi) (pglL) (pg/L) (pglL) (pg1L) (pgll-) (pg/L) (pg/L) (mg/L) Comments MW-4 11/26/1996 -- 14.57 48.84 -34.27 <50 -- <0.5 <0.5 <0.5 <0.5 <3 INo 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 -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] -- 12/12/2001 - 14.57 39.37 -24.80 <50 - <1.0[4] <1.0[4] <1.0[4] <1.0[4] <0.50[2] - 3/13/2002 - 14.57 .36.43 -21.86 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 6/18/2002 - 14.57 38.70 -24.13 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 9/11/2002 - 14.57 43.86 -29.29 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 12/18/2002 -- 14.57 41.08 -26.51 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 03/06/2003 P 14.57 38.79 -24.22 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.60 06/11/2003 P 14.57 38.22 -23.65 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.77 09/23/2003 P 14.57 42.25 -27.68 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 12/09/2003 P 14.57 41.09 -26.52 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 03/09/2004 P 14.57 38.85 -24.28 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2) 1.49 06/23/2004 P 14.57 43.77 -29.20 <50 - 0.80 <0,50 <0.50 0.50 <0.50[2] 2.59 09/20/2004 P 14.57 47.95 -33.38 <50 - <2.5 <2.5 <2.5 <2.5 <2.5[2] 2.04 12/20/2004 P 14.57 43.18 -28.61 <50 - 0.66 <0.50 <0.50 <0.50 18[2] 2.74 Report Date:October 21, 2005 Page 10 of 24