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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) (pg/L) (pg/L) (pglL) (pg/L) (pg/L) (pg/L) (mg1L) Comments MW 3 9/12/2001 1610 4419 -2809 <50 <2[4] <2[4] <2(4] <2[4] <2[2] 12/12/2001 1610 40 90 -2480 <50 <1 014] <1 0[4] <1 0[4] <1 0[4] <0 50[2] 3/13/2002 1610 3800 -21 90 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] 6/18/2002 1610 4027 2417 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] 9/11/2002 1610 4544 2934 <50 <0 50 <0 50 <050 <050 <0 50[2] 12/18/2002 1610 4267 -2657 <50 <0 50 <0 50 <0 50 <050 <0 50[2] - 03/06/2003 P 1610 4035 -2425 <50 <0 50 <0 50 <050 <050 0 68[2] 257 06/11/2003 P 1610 3981 -2371 <50 <0 50 <0 50 <050 <050 <0 50[2] 318 09/23/2003 P 1610 4378 -2768 <50 <050 <0 50 <050 <050 <0 50[2] -- 12/09/2003 P 1610 4270 -2660 <50 <0 50 <0 50 <050 <050 <0 50[2] -- 03/09/2004 P 1610 4038 2428 <50 <0 50 <0 50 <050 <0 50 <0 50[2] 1 21 06/23/2004 P 1610 4537 2927 <50 <0 50 <0 50 <050 <050 <0 50[2] 206 09/20/2004 P 1610 11 4960 3350 <50 - <0 50 <050 <050 <0 50 <0 50[21 221 12/20/2004 P 1610 4589 2979 <50 <0 50 <050 <050 <0 50 2 2[2] 445 03/28/2005 P 1610 4282 2672 <50 <0 50 <050 <0 50 <0 50 <0 50[2] 42 06/19/2005 P 1610 4322 2712 <50 - 084 J I 069 <0 50 082 <0 50[2] 3 0 09/11/2005 P 1610 4775 -31 65 <50 <0 50 <050 <0 50 <0 50 <0 50[2] 3 4 12/12/2005 P 1610 4435 .2825 <50 -- <0 50 <0 50 <0 50 054 <0 50[2] 32 MW-4 8/10/1992 1457 6434 4977 NA NA NA NA NA NA - No FP, No S 8/28/1992 - - 1,200 310 270 23 140 NA No FP No S 9/15/1992 1457 6445 4988 NA NA NA NA NA NA No FP,No S 10/6/1992 1457 6460 5003 260 26 35 <0 5 22 NA No FP,No S 11/11/1992 1457 6387 4940 NA NA NA NA NA NA No FP,No S 12/4/1992 1457 6312 1 4855 NA I NA NA NA NA NA No FP,No S 1/20/1993 1457 61 83 4726 820 160 6 9 <5' 71 NA No FP, No S 3/22/1993 1457 5995 4538 NA NA NA NA NA NA No FP, No S 4/6/1993 1457 5944 4487 1,000 250 26 <25 120 NA No FP, No S 7/30/1993 1457 6023 4566 880 220 50 45 68 NA No FP, No S 11/29/1993 1457 - - - -- -- - - Well fnaccessible,No FP No S 3/23/1994 - 1457 5429 3972 580 97 17 43 29 NA - No FP,No S 6/22/1994 1457 5441 3984 1,700 930 44 52 20 NA No FP,No S 9/28/1994 1457 5826 4369 610 73 22 1 3 1 8 NA No FP, No S Repoli Date January 25,2006 Page 9 of 25