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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No. 2130 7906 N. Et_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) (pglL) (pg/L) (pgli-) (pglL) (pg/L) (pg/L) (pg/L) (mg1L) jFP, omments MW-7 2/28/1995 - 14.16 53.61 -39.45 <50 - <0.5 <0.5 <0.5 <0.5 NA -- o S 5/19/1995 - 14.16 51.73 -37.57 <50 -- <0.5 <0.5 <0.5 <0.5 NA o S 8/28/1995 -- 14.16 53.51 -39.35 <50 - <0.5 <0.5 <0.5 <0.5 NA - o S 12/7/1995 - 14.16 52.10 -37.94 <50 - <0.5 <0,5 <0.5 <0.5 NA - o S 2/5/1996 - 14.16 49.58 -35.42 <50 - <0.5 <0.5 <0.5 <0.5 NA - o S 5/30/1996 -- 14.16 46.65 -32.49 <50 -- <0.5 <0.5 <0.5 <0.5 <3 - o S 9/18/1996 -- 14.16 50.43 -36.27 <50 - <0.5 <0.5 <0.5 <0.5 <3 -- o S 11/26/1996 - 14.16 48.30 -34.14 <50 <0,5 <0.5 <0.5 <0.5 <3 -- No FP,No S 3/24/1997 - 14.16 43.20 -29.04 <200"` -- <2" <0.5 <0.5 <0.5 <4" - NO FP,No S 5/20/1997 - 14.16 43.81 -29.65 <50 - <0.5 <0.5 <0.5 <0.5 <3 -- No FP,No S 8/19/1997 -- 14.16 47.25 -33.09 <50 - <0.5 <0.5 <0.5 <0.5 <5 -- No FP,No S 11/19/1997 - 14,16 45.42 -31.26 <50 -- 2.6 2.9 0.8 4.5 <5 - 3/4/1998 -- 14.16 40.77 -26.61 <50 - <0.5 <0.5 <0.5 <0.5 <5 - No FP,No S 6/26/1998 - 14.16 38.57 -24.41 <50 -- <0.5 <0.5 <0.5 <0.5 <5 -- 9/1/1998 -- 14.16 40.42 -26.26 <50 - <0.5 <0.5 <0.5 <0.5 <5 - 12/2/1998 -- 14.16 37.70 -23.54 <50 - <0.5 <0.5 <0.5 <0.5 <5 -- 3/31/1999 - 14.16 34.16 -20.00 <50 - 1.11 1.06 0.932 2.73 <5 -- 6/4/1999 - 14.16 35.49 -21.33 <50 - <0.5 <0.5 <0.5 <0.5 <5 -- 9/2/1999 -- 14.16 40.02 -25.86 <50 - <0.5 <0.5 <0.5 <0.5 <5 - 11/29/1999 - 14.16 38.21 -24.05 <50 - <0.5 <0.5 <0.5 <0.5 <2.5 - 3/16/2000 - 94.16 34.14 -19.98 <50 -- <0.5 <0.5 <0.5 <0.5 <2.5 - 6/26/2000 -- 14,16 36.78 -22.62 <50 -- <0.5 <0.5 <0.5 <0.5 <2[2] - 9/28/2000 -- 14.16 41.02 -26.86 <50 - <0.5 <0.5 <0.5 <0.5 <2[2] -- 12/19/2000 -- 14.16 36.63 -22.47 <50 - <0.5 <0.5 <0.5 <0.5 <2.5 -- 3/15/2001 - 14.16 34.50 -20.34 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] -- 6/20/2001 14.16 37.79 -23.63 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] - 9/12/2001 -- 14.16 42.00 -27.84 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] - 12/12/2001 -- 14.16 38.85 -24.69 <50 <1,0[4] <1.0[4] <1.0[4] <1.0[4] <0.50[2] - 3/13/2002 14.16 35.93 -21.77 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 6/18/2002 - 14.16 38.18 -24.02 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] - 9/11/2002 -- 14.16 43.28 -29.12 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 12/18/2002 -- 14.16 40.70 -26.54 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 03/06/2003 P 14,16 38.31 -24.15 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 4.56 Report Date.,October 21, 2005 Page 15 of 24