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To Paeof 17 ie <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2093 R <br /> 3425 Tracy Blvd,Tracy,California <br /> Floating <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/1) <br /> TEX-1 09/16/99 1170 — — — - - - - 24 <br /> (cont) 12122199 1156 -- -- - — - - 183 <br /> 02/29100 10 98 — - -- -- .. _ _ 4 0 <br /> =Indicates not measured or sampled (a)All elevations corrected to an arbitrary datum based on a <br /> TPH-G =Total Petroleum Hydrocarbons as Gasoline temporary on-site benchmark with an assigned elevation of 50 Feet <br /> TOC =Top of Casing (b)Corrected water level elevation value(Wlc=Wlm+(b)(p)),where Wlc=water-level <br /> MSL =Mean Sea Level elevation corrected,Wlm=water-level elevation measured,b=hydrocarbon thickness(feet) <br /> MTBE =Methyl Tertiary Butyl Ether by EPA Method 8020 p=specific gravity(0 7)of hydrocarbon <br /> P =Wells purged prior to sample collection (c)Top of well casing altered Well casing has not been resurveyed Water-level measured <br /> NP =Wells not purged prior to sample collection from the highest point of well casing <br /> * =MtBE confnmatron analytical results(by EPA 8260) <br /> 00 = Dissolved Oxygen <br />