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Table 1 9 i <br /> Groundwater Elevation and Analytical Data <br /> Page 14 of 14 <br /> ARCO Service Station#2093 <br /> 3425 Tracy Blvd,Tracy,Califomia <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 <br /> Sampled (feet,MSL) (feet,TOC) In feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> TEX-1 8111197 <br /> (Cont) 3130198 11 00 <br /> 6126/98 1161 <br /> - Indicates not measured or sampled <br /> TPH-G =Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015,modified BTEX distinction by EPA Method 6020 <br /> TOC =Top of Casing <br /> MSL =Mean Sea Level <br /> MTBE =Methyl Tertiary Butyl Ether by EPA Method 8020 <br /> DO =Dissolved Oxygen <br /> P P=Wells purged prior to sample collection <br /> NP NP=Wells not purged prior to sample collection <br /> =MtBE confnmation analytical results(by EPA 8260) <br /> Wells ATR-1,ATR-3,ATR-6,ATR-9,ATR-10,and ATR-11 on a <br /> semi-annual sampling schedule Sampled during thel st and 3rd quarters <br /> of each year <br /> (a)All elevations corrected to an arbitrary datum based on a <br /> temporary on-site benchmark with an assigned elevation of 50 feet <br /> (b)Corrected water level elevation value(Wlc=WIm+(b)(p)),where Wlc=water-level <br /> elevation corrected,WIm=water-level elevation measured,b=hydrocarbon thickness(feet), <br /> p=specific gravity(0 7)of hydrocarbon <br /> (c)Top of well casing altered Well casing has not been resurveyed Water-level measured <br /> from the highest point of well casing <br /> 7G600-026-001/GW Tables t <br />