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Table 1 Page 31 of 31 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Holt Dr.,Stockton,California Well Depth Product Groundwater Groundwater Total Date Elevation to Water thickness, Elevation Elevation change TPH-G Benzene Toluene Ethylbenzene Xylenes MtBE DO Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mgll MW-5 3/8/95 1.04 12.91 - -11.87 -11.87 1,800 43 4.7 3.3 60 -- 6/2/95 11.40 -10.36 1.51 1,300 55 2.7 2.3 75 9/11/95 13.65 -- -12.61 -2.25 1,500 87 3 9.1 29 -- 12/5/95 14.03 - -12.99 -0.38 2,200 120 <10(e) 16 11 3/18/96 10.82 -9.78 3.21 8,200 190 19 24 800 -- 6118/96 9.50 - -8.46 1.32 15,000 170 <25 <25 2,500 <250 9/25/96 12.30 -11.26 -2.80 3,800 130 <5 8.4 71 <50 12/4/96 11.63 -- -10.59 0.67 4,200 88 <2 15 44 <20 -- 3/19/97 P 7.18 - -6.14 4.45 1,400 26 5.6 4.6 9.8 -- 0.1 6/5/97 P 8.84 -7.80 '-1.66 1,900 22 5.1 4 14 <10 0.2 8119/97 NP 10.25 -9.21 -1.41 <50 <0.5 <0.5 <0.5 <0.5 <5 0.2 11/25/97 NP 10.48 -9.44 -0.23 210 <0.5 <0.5 <0.5 <0.5 <5 -- 3/20/98 P 4.27 -- -3.23 6.21 <50 <0.5 <0.5 <0.5 <0.5 <5 2.2 6/24198 Well Box Inaccessible -- .. __ -- __ 9/10/98 P 7.79 -6.75 -- <50 <0.5 <0.5 <0.5 <0.5 <5 12/17/98 P 8.06 - -7.02 -0.27 99.5 <0.5 <0.5 <0.5 <0.5 <5 -- 3/10/99 P 5.86 -4.82 2.20 80.6 <0.5 <0.5 <0.5 <0.5 <5 2.8 6/22/99 Well Box Inaccessible -- -- __ .. 9113199 Well Box Inaccessible - _ _ 12/16/99 P 9.25 -- -8.21 -- 186 0.96 <0.5 <0.5 1.03 <2.5 3.3 3123/00 P 4.61 -3.57 4.64 355 0.620 <0.5 <0.5 1.28 <2.5 2.0 6/21/00 P 6.96 -5.92 -2.35 <50 <0.5 <0.5 <0.5 <0.5 <2.5 0.2 9/13100 P 8.68 -7.64 -1.72 <50 <0.5 <0.5 <0.5 <0.5 <2.5 2.41 12/15/00 P 8.16 -7.12 0.52 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 0.83 312/01 P 6.10 - -5.06 2.06 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 3.5 5/10101 P 6.19 - -5.15 -0.09 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 3.0 a =Corrected water-level elevation value where free product is present(Wle=Wlm+(b)(p)),where Wlc=water-level elevation corrected,Wlm=water-level elevation measured, =Indicates not measured,not calculated,or not analyzed. For product thickness,indicates no SPH detected. TPH-G =Total Petroleum Hydrocarbons as Gasoline by USEPA Method 8015,Modified MtBE =Methyl tert-Butyl Ether by USEPA Method 8020 DO =Dissolved Oxygen ppb=parts per billion P =Well purged prior to sample collection mg/l=milligrams per liter NP =Well not purged prior to sample collection. TOC =Top of Casing MSL =Mean Sea Level BTEX Distinction by USEPA Method 8020 Wells E-3, E-4, E-5, E-6,E-7,PA-2,BHD-2,MW-1,MW-2,and MW-3 are on a semi-annual sampling schedule.