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To Pao of 17 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2093 <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 10/26/95 (c) 1286 -- -- -- <350 <5 <0 5 <0 5 <0 5 - <br /> 02/12/96 1090 — — -- -- — - <br /> 04/18/96 1135 — — - <50 <0 5 <0 5 <0 5 <0 5 -- <br /> 07/18/96 1152 - — -- -- - — <br /> 11/15/96 1230 -- - - - — - -- <br /> 03/14/97 — — — -- -- - — - -- <br /> 06/04/97 — — -- — -- —08/11/97 — — -- — - -- _ — <br /> 11/17/97 — — — -- -- -- __ -_ <br /> 03/30/98 1100 — - — - -- _- <br /> 06/25/98 100 — — -- -- -- — _ <br /> 09/11/98 -- -- — -- -- <br /> 12/15/98 1147 -- — -- — - - 01 <br /> 05/14/99 1160 — - -- -- - - -- 480 <br /> 09/16/99 1170 — — -- — - -- - 24 <br /> 12/22/99 1156 _ _ _ _ _ - -- -- 183 <br /> 02/29/00 1098 — — -- - - - -- -- 40 <br /> 06/07100 -- — — -- -- — .. ._ .. -. — <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 confnmation analytical results(by EPA 8260) <br /> DO =Dissolved Oxygen <br />