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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) (pg/L) (IjWL) (pg/L) 44L) (E,g/L) (p9/L) (AVL) (mg/L) Comments VW 7 5/20/1997 4505 56 06 <0 5 <0 5 0 8 4 No FP No S 9/1/1998 4163 - NA NA NA NA NA NA 12/2/1998 3895 NA NA NA NA NA NA 3/31/1999 3866 NA NA NA NA NA NA 6/4/1999 3663 NA NA NA NA NA NA 9/2/1999 4122 NA NA NA NA NA NA 11/29/1999 - Well inaccessible 3/16/2000 - Well inaccessible 6/26/2000 3682 NA NA NA NA NA NA 9/28/2000 4113 NA NA NA NA NA NA 12/19/2002 4169 160 <0 50 <0 50 1 3 <0 50 11 0[2] 03/06/2003 P 3941 440 059 <5 0 <50 <5 0 11[2] 11 06/11/2003 P 3900 - <50 <0 50 <0 50 <0 50 <0 50 0 54[2] 412 09/24/2003 P 4299 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] -- 12/10/2003 P 41 73 210 3 0 <2 5 <2 5 48 9 1[2] 03/08/2004 P 3945 59 <25 <2 5 <2 5 <2 5 6 3[2] 155 06/24/2004 P 4439 - <50 <0 50 <0 50 <0 50 <0 50 1 1[2] 306 Water levels taken on 6123104 09/20/2004 P 4856 <50 <0 50 <0 50 <0 50 <0 50 1 212] - t 2/20/2004 P 4548 300 J <0 50 <0 50 <0 50 <0 50 13[2] 187 03/28/2005 P 4248 280 <5 0 <50 <5 0 <5 0 9 5(2] 1 4 06/20/2005 P 4285 100 J <0 50 <0 50 <0 50 <0 50 3 0[2]J 1 2 Water level taken 6119105 09/12/2005 P 47 38 <50 <0 50 <0 50 <0 50 <0 50 0 93(2] 1 8 Water levels taken on 9/11/05 12/11/2005 P -- 4402 -- 290 — <050 <0 50 <0 50 061 8 8[2]J 097 VW-8 1 5/20/1997 4481 25,000 - 480 290 260 3,900 <120' - No FP, No S 9/1/1998 - 4023 NA NA NA NA NA NA 12/2/1998 3869 NA NA NA NA NA NA - 3/31/1999 3750 NA NA NA NA NA NA 6/4/1999 3656 NA NA NA NA NA NA 9/2/1999 4099 NA NA NA NA NA NA 11/29/1999 3914 -- NA NA NA NA NA NA 3/16/2000 - 3524 NA NA NA NA NA NA Report Date Jan uary 25,2006 Page 21 of 25