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.. C" 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) WgIL) (pg/L) (pg1L) .(pg1L) (pg1L) (pg1L) (pglL) (mg1L) Comments MW-1 8/19/1997 14.58 47.78 -33.20 200 - 6.5 <0,5 <0.5 <0,5 <5 No FP,No S 11/19/1997 -- 14.58 45.95 -31.37 170 -- 7 0.77 X0.5 0.63 <5. -- 3/4/1998 -- 14.58 41.33 -26.75 <50 -- 0.51 <0.5 <0.5 <0.5 <5 - No FP,No S ' 6/26/1998 14.58 39.13 -24.55 248 -- 1.73 <0.5 <0.5 <0.5 <5 911/1998 -- 14.58 40.89 -26.31 249 -- 5.19 <0.5 <0.5 <0.5 <5 -- 12/2/1998 -- 14.58 38.20 -23.62 227 - <0.5 <0.5 <0.5 <0.5 12.7 3/31/1999 -- 14.58 34.68 -20.10 152 -- <0.5 <0.5 <0.5 <0.5 <5 -- 6/4/1999 - 14.58 35.98 -21.40 168 -- 2.63 <0.5 <0.5 <0.5 10.9 -- 9/2/1999 - 14.58 40.49 -25.91 232 1.04 <0.5 <0.5 <0.5 <5 - 11/29/1999 -- 14.58 38.64 -24.06 129 -- <0.5 <0.5 <0.5 <0.5 <2.5 - 3/16/2000 - 14.58 34.66 -20.08 55.2 -- <0.5 <0.5 <0.5 <0.5 <2.5 6/26/2000 14.58. 37.26 ... -22,68, 175 - <0.5 <0.5 <0.5 <0.5, _<2[2] 9/28/2000 14.58 41.49 -26.91 86.9[3] - 2.14 <0.5 <0.5 <0.5 <2[2] - 12/19/2000 14.58 37,17 -22.59 <50 -- <0.5 <0.5 <0.5 <0.5 <2.5 - 3/15/2001 -- .14.58 35.00 -20.42 <50 -- <2(4] <2[4] <2[4] <2[4] <2[2] - 6l2012001 - 14.58 38.27 -23.69 <50 - <2[4] <2[4] <2(4] <2[4] <2[2] -- 9/12/2001 - 14.58 42.47 -27.89 <50 - <2[4] <2[4] <2[4] <2[4] <2[2] - 12/12/2001 - 14.58 39.36 -24.78 <50 -- <1.0[4] <1.0[4] <1.0[4] <1.0[4] 0.54[2] - 3/13/2002 14.58 36.46 -21.88 <50 - <0.50 <0.50 <0.50 <0,50 <0.50[2] - 6/18/2002 -- 14.58 38.65 -24.07 <50 - <0.50 <0.50 <0.50 <0.50 <0.50(2] -- 9/11/2002 -- 14.58 43.73 -29.15 <50 -- <0.50 <0.50 <0.50 <0.50 <0,50[2] - 12/18/2002 -- 14.58 41.15 -26.57 <50 -- <0.50 <0.50 <0.50 <0.50 <0,50[2] - 03/06/2003 P 14.58 38.84 -24.26 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 4.4 06/11/2003 .P 14.58 38.12 -23.54 <50. - <0.50 <0:50. <0.50 <0.50. - <0.50[2] _ 2.13 09/23/2003 P 14.58 42.13 -27,55 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 12/09/2003 P 14.58 41.18 -26.60 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 03/09/2004 P 14.58 38.91 -24.33 <50 - <0.50 <0.50 <0.50 <0.50 UJ <0.50[2] 2.07 06/23/2004 P 14.58 43.70 -29.12 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.11 09/20/2004 P 14.58 47.84 -33.26 <50 - <0.50 <0.50 <0.50, <0.50 <0.50[2]. 1.0 12!20/2004 P 14.58 44.46< -29,88 150 - <0.50 <0.50 <0.50 .4 <0.50[2] 5.3 03/28/2005 P 14.58 41.25 -26.67 <50 - <0.50 <0.50 <0.50 <0.50 <0.50(2] 5.3 MW-2 1/7/1992 -- 15.19 47.11 -31.92 8,000 -- 82 <60 48 170 K INo FP, No S 2/24/1992 - 15.19 61.59 -46.40 NA - NA NA NA I NA j K INo FP, No S Report Date:April 25,2005 Page 4 of 23