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Tao Pa*of 30 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2133 <br /> 2908 Benjamin Holt Dr,Stockton,California <br /> Well Depth Product Groundwater Groundwater Total <br /> Date Elevation to Water thickness, Elevation Elevation change TPH-G Benzene Toluene Ethylbenzene Xylenes MTBE DO <br /> Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mg/I <br /> MW-5 11/25/97 NP 1048 -- -944 -023 210 <0 5 <0 5 <0 5 <05 <5 -- <br /> (cont) 3120198 P 427 — -3 23 6 21 <50 <0 5 <05 <0 5 <0 5 <5 2 2 <br /> 6124198 Well Box Inaccessable — -- -- -- -- -- — — — <br /> 9110198 P 7 79 — -675 -- <50 <0 5 <0 5 <0 5 <0 5 <5 - <br /> 12117/98 P 806 — -7 02 -027 995 <0 5 <0 5 <0 5 <0 5 <5 — <br /> 3110199 P 5 86 — -4 82 220 806 <0 5 <0 5 <0 5 <0 5 <5 2 8 <br /> 6122199 — Well Box Inaccessable — -- <br /> 9113199 — Well Box Inaccessable — -• -- — -- -- — — -- <br /> 12/16/99 P 925 — -821 -- 186 096 <0 5 <0 5 1 03 <2 5 33 <br /> 3123100 P 4 61 -- -357 4 64 355 0 620 <0 5 <0 5 128 <2 5 2 0 <br /> 6121100 P 696 — �5 92 -235 <50 <0 5 <0 5 <0 5 <0 5 <2 5 0 2 <br /> a =Corrected water-level elevation value where free product is present(WIc=Wlm+(b)(p)),where Wlc=water-level elevation corrected Wlm=water-level elevation measured <br /> b=hydrocarbon thickness(in feet),p=specific gravity(0 7)of hydrocarbon <br /> - =Indicates not measured or not calculated <br /> TPH-G =Total Petroleum Hydrocarbons as Gasoline by USEPA Method 8015,Modified <br /> MTBE =Methyl Tert-Butyl Ether by USEPA Method 8020 <br /> DO =Dissolved Oxygen <br /> P =Well purged prior to sample collection <br /> NP =Well not purged prior to sample collection <br /> TOC =Top of Casing <br /> MSL =Mean Sea Level <br /> BTEX Distinction by USEPA Method 8020 <br /> Wells E-3,E-4,E-5,E-6,E-7,PR-2 BHD-2 MW-1,MW-2,and MW-3 on a semi-annual sampling schedule <br /> 077 41930 802/GW Tables <br />