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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 P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) W91L) (pg/L) (pg/L) (pg/L) (pglL) (pg/L) (mg/L) Comments MW 2 6/20/2001 1519 3899 2380 <50 <2[4] <2[4] <2[4] <2(4] <2[2] 9/12/2001 15 19 4329 -2810 <50 <2(4] <2[4] <2[4] <2[4] <2[2] 12/12/2001 - 1519 4020 -2501 <50 <1 0[4] <1 0[4] <1 0[4] <1 0[4] 1 2[2] 3/13/2002 1519 3721 -2202 <50 062 <050 <050 <050 2 5[2] 6/18/2002 1519 3738 2219 <50 1 5 <0 50 <0 50 1 7 2 6[2] 9/11/2002 1519 4449 -2930 <50 1 1 <050 <0 50 <0 50 3 0[2] 12/18/2002 - 1519 4194 -2675 <50 - <0 50 <050 <050 <0 50 2 5[2] 03/06/2003 P 1519 3955 2436 <50 <0 50 <0 50 <05 0 <0 50 0 60[2] 1 96 06/11/2003 P 15 19 3899 -2380 <50 <0 50 <0 50 <050 <050 <0 50[2] 266 09/23/2003 P 1519 4297 -2778 <50 <050 <0 50 <0 50 <0 50 <0 50[2] -- 12/09/2003 P 1519 41 99 -26 80 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] -- 03/09/2004 P 1519 3959 2440 <50 <0 50 <050 <0 50 <0 50 <0 50[2] 244 06/23/2004 P 15 19 4444 2925 <50 063 <0 50 <050 <0 50 <0 50[2] 174 09/20/2004 P 1519 4869 -3350 <50 <2 5 <2 5 <25 <2 5 <2 5[2] 12/20/2004 P 1519 4501 -2982 <50 <0 50 <0 50 <0 50 <050 0 60[2] 432 03/28/2005 P 1519 4205 2686 84 <0 50 <0 50 <0 50 <0 50 0 65[2] 4 6 06/19/2005 P 15 19 4237 2718 <50 <0 50 <0 50 <0 50 <0 50 1 0(2],D 51 09/11/2005 P 1519 4682 -3163 <50 072 <050 <0 50 <0 50 1 3[2] 37 .12/1212005, P 1519 4377 -2858 78 -- 1 1 J <050 <050 061 1_5[2] 3 9 MW 3 1/7/1992 1610 6305 4704 2 100 41 <30 <3 0 57 NA -- No FP, No S 2/24/1992 1610 6237 4663 NA NA NA NA NA NA No FP, No S 3/31/1992 1610 6217 4616 NA NA NA NA NA NA No FP, No S 4/21/1992 1610 6261 4641 110 4 9 <0 5 <0 5 46 NA No FP,No S 5/11/1992 16 10 6317 4707 NA NA NA NA NA NA - No FP, No S 6/23/1992 1610 6326 4716 NA - NA NA NA NA NA No FP,No S 7/8/1992 1610 6450 4840 55 15 <05 <05 1 2 NA No FP, No S 8/10/1992 1610 6543 4933 NA NA NA NA NA NA No FP No S 9/15/1992 1610 6607 4997 NA NA NA NA NA NA No FP, No S 10/6/1992 1610 6620 5010 300 58 <0 5 <0 5 18 NA INo FP, No S 11/11/1992 1610 6550 4940 NA NA NA NA NA NA INo FP, No S 12/4/1992 1610 6423 4815 NA NA NA NA NA NA INo FP, No S 1/20/1993 1610 6345 4735 420 65 0 7 <0 5 45 NA No FP, No S 3/22/1993 1610 61 57 j 4547 NA NA NA NA NA NA INo FP No S Report Date January 26,2006 Page 7 of 25