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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 msi) (pglL) (pg/L) (pglL) (ugIL) (pg1L) (pg1L) (7rglL) (mg/L) Comments MW-3 9/2/1999 -- 16.10 42.16 -26.06 <50 - <0.5 <0.5 <0.5 <0.5 <5 -- 11/29/1999 -- 16.10 40.24 -24.14 <50 <0.5 <0.5 <0.5 <0.5 <2.5 _ 3/16/2000 -- 16.10 36.21 -20.11 <50 - <0.5 <0.5 <0.5 <0.5 <2.5 - 6/26/2000 16.10 38.89 -22.79 <50 - <0.5 <0.5 <0.5 <0.5 <2[2] - 9/28/2000 -- 16.10 43.14 -27.04 59.3[3] -- <0.5 <0.5 <0.5 <0.5 <2[2] - 12/19/2000 - 16.10 38.72 -22.62 <50 - <0.5 <0.5 <0.5 <0.5 <2.5 -- 3/15/2001 - 16.10 36.53 -20.43 <50 <2[4) <2[4] <2[4] <2[4] <2[2] -- 6/20/2001 -- 16.10 39.90 -23.80 <50 <2[4) <2[4] <2[4] <2[4] <2[2] -- 9/12/2001 - 16.10 44.19 -28.09 <50 <2[4] <2[4] <2[4) <2[4] <2[2] -- 12/12/2001 -- 16.10 40.90 -24.80 <50 -- <1,0[4] <1.0[4] <1.0[4] <1.0[4] <0.50[2] 3/13/2002 - 16.10 38.00 -21.90 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 6/18/2002 -- 16.10 40.27 -24.17 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 9/11/2002 -- 16.10 45.44 -29.34 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 12/18/2002 - 16.10 42.67 -26.57 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 03/06/2003 P 16.10 40.35 -24.25 <50 - <0.50 <0.50 <0.50 <0.50 0.68[2] 2.57 06/11/2003 P 16.10 39,81 -23.71 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2) 3.18 09/23/2003 P 16.10 43.78 -27.68 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 1210912003 P 16.10 42,70 -26.60 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - 03/09/2004 P 16.10 40.38 -24.28 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.21 06/23/2004 P 16.10 45.37 -29.27 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.06 09/20/2004 P 16.10 49.60 -33.50 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.21 12/20/2004 P 16.10 45.89 -29.79 <50 - <0.50 <0.50 <0.50 <0.50 2.2[2] 4.45 03128/2005 P 16.10 42.82 -26.72 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 4.2 MW-4 8!1011992 -- 14.57 64.34 49.77 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 14,57 64.45 49.88 NA - NA NA NA NA NA - No FP,No S 10/6/1992 -- 14.57 64.60 50.03 260 -- 26 3.5 <0.5 22 NA No FP, No S 11/11/1992 - 14.57 63.87 49.40 NA - NA NA NA NA NA - No FP, No S 12/4/1992 -- 14.57 63.12 48.55 NA - NA NA NA NA NA - No FP,No S 1/20/1993 - 14.57 61.83 47,26 820 -- 160 6.9 <5` 71 NA -- No FP,No S 3/22/1993 - 14.57 59.95 45.38 NA - NA NA NA NA NA - No FP,No S 4/6/1993 - 14.57 59.44 44.87 1,000 - 250 26 <2.5 120 NA -- No FP,No S 7/30/1993 -- 14.57 60.23 45.66 880 -- 220 50 4.5 68 NA - No FP,No S Report Date:April 25, 2005 Page 8 of 23