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Tas Pa*f 32 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) mg/l MW-5 11/25/97 NP 1048 — -944 -023 210 <0 5 <0 5 <0 5 <0 5 <5 -- (cont) 3/20/98 P 427 -- -323 621 <50 <0 5 <0 5 <0 5 <0 5 <5 22 6/24/98 Well Box Inac cessabte -- -- -- -- - -- - - 9/10198 P 779 — -675 -- <50 <0 5 <0 5 <0 5 <0 5 <5 12/17/98 P 806 — -702 -027 995 <0 5 <0 5 <0 5 <0 5 <5 - 3/10199 P 586 — -482 220 806 <0 5 <0 5 <0 5 <0 5 <5 28 6/22199 -- Well Box Inaccessable - -- -- - - -- - -- - 9/13/99 Well Box Inaccessable — — — — — — -- -- — 12/16/99 P 925 -- -821 -- 186 096 <0 5 <0 5 103 <2 5 33 3/23100 P 461 — -357 464 355 0 620 <0 5 <0 5 1 28 <2 5 20 6/21100 P 696 -- -592 -235 <50 <0 5 <0 5 <0 5 <0 5 <2 5 02 9113/00 P 868 — -764 .172 <50 <0 5 <0 5 <0 5 <0 5 <2 5 241 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, b=hydrocarbon thickness(in feet),p=specific gravity(0 7)of hydrocarbon =Indicates not measured,not calculated,or analyzed For SPH,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 P =Well purged prior to sample collection 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,EA E-5,E-6,E-7,PR-2,SHO-2 MW-1,MW-2,and MW-3 on a semi-annual sampling schedule 077 41930 803/GW Tables