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s • • 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 TPH9 TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msi) (pg/L) {pglL) (pg/L) (pg/L) (Erg/L) (pg/L) (pg/L) (mg/L) Comments MW 1 3/15/2001 1458 3500 -2042 <50 <2[4] <214] <2[4] <2[4] <2[2] 6/20/2001 1458 3827 2369 <50 <2[4] <2[4] <2[4] <2[4] <2[2] 9/12/2001 1458 4247 2789 <50 <2[4] <2[4] <2[4] <2[4] <2[2] 12/12/2001 1458 3936 2478 <50 <1 0[4] <1 0[4] <1 0[4] <1 0[4] 0 54[2] 3/13/2002 1458 3646 2188 <50 <0 50 <0 50 <050 <050 <0 50[2] 6/18/2002 1458 3865 -2407 <50 <0 50 <050 <0.50 <0 50 <0 50[2] 9/11/2002 1458 4373 2915 <50 <0 50 <050 <0 50 <0 50 <0 50[2] 12/18/2002 1458 4115 2657 <50 <0 50 <0 50 <0 50 <050 <0 50[2] 03/06/2003 P 1458 3884 -2426 <50 <050 <0 50 <050 <0 50 <0 50[2] 44 06/11/2003 P 1458 3812 2354 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] 213 09/23/2003 P 1458 4213 2755 <50 <0 50 <050 <0 50 <0 50 <0 50f2] -- 12/09/2003 P 1458 41 18 -2660 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] 03/09/2004 P 1458 3891 2433 <50 <0 50 <0 50 <0 50 <0 50 UJ <0 50[2) 207 06/23/2004 1 P 1458 4370 2912 <50 <0 50 <050 <0 50 <0 50 <0 50[2] 311 09/20/2004 P 1458 4784 -3326 <50 <0 50 <050 <0 50 <0 50 <0 50[2] 10 12!2012004 P 1458 4446 2988 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] 53 03/28/2005 P 1458 41 25 1 2667 <50 <0 50 <050 <050 <0 50 <0 50[2] 53 06/19/2005 P 1458 41 50 -2692 <50 I <0 50 <0 50 <050 <0 50 1 0[2]J 57 09/11/2005 P 1458 4598 31 40 51 <0 50 <0 50 <050 <0 50 0 75[23 38 12/12/2005 P 14 58 4300 -2842 110 -- <050 <050 <050 060 <0 50[2] 40 MW-2 1/7/1992 15 19 4711 31 92 8,000 82 <60 48 170 NA - No FP No S 2/24/1992 1519 6159 4640 NA NA NA NA NA NA No FP No S 3/31/1992 1519 61 37 -4618 NA NA NA NA NA NA No FP,No S 4/21/1992 1519 61 70 4651 1,500 16 <0 5 22 53 NA No FP, No S 5/11/1992 15 19 6236 4717 NA NA NA NA NA NA No FP, No S 6/23/1992 15 19 62 44 -4725 NA NA NA NA NA NA No FP No S 7/8/1992 1519 6366 4847 2 100 140 36 27 45 NA No FP, No S 8/10/1992 1519 6458 4939 NA NA NA NA NA NA No FP, No S 9/15/1992 1519 6522 -5003 NA -- NA NA NA NA NA No FP No S 10/6/1992 1519 6538 5019 950 90 5 4 12 79 NA No FP, No S 11/11/1992 1519 6469 -4950 NA NA NA NA NA NA No FP No S 12/4/1992 1519 6396 4877 NA NA NA NA NA NA No FP No S 1/20/1993 -1,519 6269 -4750 1,400 41 <2 5 24 64 NA No FP, No S Report Date January 25,2006 Page 5 of 26