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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No. 2130 7106 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 msi) (pg/L) (pglL) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (mg/L) Comments MW-7 06/11/2003 P 14.16 37.55 -23.39 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.97 09/23/2003 P 14.16 41.57 -27.41 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] - 121/0912003 P 14.16 40.75 -26.59 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] - 03/09/2004 P 14.16 38.38 -24.22 67 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.45 06/23/2004 P 14.16 43.49 -29.33 <50 - 0.79 <0.50 <0.50 0.61 <0.50[2] 3.03 09/20/2004 P 14.16 47.29 -33.13 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.92 1 212 012 004 P 14.16 43.75 -29.59 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 4.50 03/28/2005 P 14.16 40.65 -26.49 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] 4.70 06/19/2005 P 14.16 40.99 -26.83 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.30 09/11/2005 P 14.16 45.52 -31.36 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.90 MW-8 11/29/1993 -- 14.16 58.86 44.40 69 -- <0.5 <0.5 <0.5 <0.5 NA - No FP,No S 3/23/1994 - 14.16 53.61 39.45 340 - 57 66 9.3 42 NA -- No FP,No S 6/22/1994 - 14.16 53.75 39.59 <10 - <0.3 <0.3 <0.3 <0.3 NA -- No FP,No S 9/28/1994 -- 14.16 57.41 43.25 <50 -- <0.5 <0.5 <0.5 <0.5 NA - No FP,No S 12/1/1994 - 14.16 53.12 38.96 60 - 27 13 0.8 13 NA -- No FP,No S 2/28/1995 - 14.16 53.54 -39.38 <50 <0.5 1.3 <0.5 <0.5 NA -- No FP, No S 5/19/1995 -- 14.16 51.66 -37.50 55*** - <0.5 <0.5 <0.5 <0.5 NA - No FP,No S 8/28/1995 - 14.16 53.34 -39.18 <50 - <0.5 <0.5 <0.5 <0.5 NA -- No FP, No S 12/7/1995 - 14.16 52.02 -37.86 <50 - <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S 2/5/1996 -- 14.16 -- - -- -- -- - - -- - - Not Sampled[1] 5/30/1996 -- 14.16 - -- - - - - -- -- -- -- Not Sampled[1) 7/28/1996 - 14.16 -- -- -- - - -- -- -- -- - Well Destroyed MW-10 11/29/1993 - 14.38 59.30 44.92 1,000 <11** <3** <J* 1 NA -- No FP, No S 3/23/1994 = 14.38 54.36 39.98 1,300 - 6.6 6.1 1.6 3.6 NA -- No FP,No S 6/22/1994 - 14.38 54.35 39.97 1,600 - 5 15 3.3 5.5 NA -- No FP,No S 9/28/1994 -- 14.38 58.11 43.67 NA - NA NA NA NA NA - No FP, No S 9/29/1994 -- -- - -- 1,100 - <0.5 <0.5 3.6 4 NA No FP, No S 12/1/1994 - 14.38 57.15 42.77 800 - <0.5 2.3 0.8 1.3 NA -- No FP, No S 2/28/1995 - 14.38 54.24 -39.86 300 -- 0.9 <0.5 <0.5 <0.5 NA - No FP,No S 51119/1995 -- 14.38 52.32 -37.94 370 - 0.9 <0.5 <0.5 <0.5 NA -- No FP,No S 8/28/1995 j 14,38 1 53.70 1 -39.32 1 420 - -j 1.2 <0.5 <0.5 10.5 NA - No FP, No S 12/7/1995 1 14.38 52.61 1 -38.23 490 -- 0.7 10.5 <0.5 <0.5 NA - No FP, No S Report Date:October 21, 2005 Page 16 of 24