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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) (4/1-) (ugIL) (lrg/L) {1rgIL) (1rg1L) WgIL) WIL) (mg/L) Comments MW-2 12/20/2004 P 1519 4501 -2982 <50 -- <0 50 <0 50 <0 50 <0 50 0 60[2] 432 03/28/2005 P 1519 4205 -2686 84 – <0 50 <0 50 <0 50 <0 50 0 65[2] 460 06119/2005 P 1519 4237 -2718 <50 -- <0 50 -<050 <0 50 <0 50 10[2]J 5 10 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 6251 4641 110 – 4 9 <0 5 <0 5 4 6 NA -- No FP,No S 5/11/1992 -- 1610 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 7/6/1992 – 1610 6450 4840 55 – 15 <0 5 <0 5 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 <05 <0 5 1 8 NA -- No FP, No S 11/11/1992 -- 1610 6550 4940 NA – NA NA NA NA NA -- No FP, No S 12/4/1992 - 1610 6423 4815 NA -- NA NA NA NA NA -- No 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 6157 4547 NA - NA NA NA NA NA -- No FP,No S 4/6/1993 – 1610 6108 4498 200 – 3 <05 <05 27 NA – No FP, No S 7/30/1993 -- 1610 6182 4572 89 – 1 5 <05 <05 <0 5 NA – No FP, No S 11/29/1993 – 1610 6083 4473 120 - 51 <05 <0 5 19 NA -- No FP No S 3/23/1994 -- 1610 5591 3981 580 – 24 15 2 9 14 NA – No FP,No S 6/22/1994 - 1610 5602 3992 <10 03 <0 3 <0 3 <0 5 NA - No FP No S 9/28/1994 - 1610 5992 4382 <50 07 <0 5 <0 5 <05 NA No FP No S 12/1/1994 -- 1610 5880 -4270 <50 – 0 8 <05 <0 5 <0 5 NA – No FP No S 2/28/1995 1610 5588 -3978 73 -- 07 <0 5 <0 5 <0 5 NA - No FP No S 5/19/1995 - 1610 5394 -3784 52— – <0 5 <0 5 <0 5 <0 5 NA -- No FP No S 8/28/1995 1610 5564 -3954 <50 -- <0 5 <05 <0 5 <0 5 NA -- No FP,No S 12/7/1995 1610 54 30 -3820 <50 – <0 5 <0 5 <0 5 <0 5 NA – No FP No S 2/5/1996 - 1610 5173 -3563 <50 -- <05 <0 5 <0 5 <0 5 NA -- No FP, No S 5/30/1996 – 1610 4879 -3269 <50 – <05 <0 5 <0 5 <0 5 <3 – No FP No S 9/18/1996 1610 5273 -3663 <50 -- <0 5 <0 5 <0 5 <0 5 <3 - No FP No S 11/26/1996 1610 5041 -3431 <50 -- 19 <05 <0 5 <0 5 <3 – No FP No S 3/24/1997 1610 4529 -2919 <50 -- <0 5 <0 5 <0 5 <0 5 <3 No FP No S Report Date July 27,2005 Page 7 of 23