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TableT PageTBof 18 <br /> Groundwater Elevation and Analytical Data <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 TPHg 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 /> SMW-1 03/30/98 NP 1215 -- - 910 46 <0 5 <0 5 1 1 110 1 6 <br /> (cont) 06/25/98 NP 1270 - - -- 692 0 666 <0 5 <0 5 <0 5 765 16 <br /> 09/11/98 NP 1290 -- <50 <0 5 <0 5 <0 5 <0 5 290 17 <br /> 12/15/98 -- -- - -- -- - - - - <br /> Well no longer monitored or sampled <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 /> 03114/97 -- -- -- <br /> 06/04/97 - - - --08/11/97 -- - - <br /> 11117/97 -- - -- -' -- <br /> 03/30/98 1100 <br /> 06/25/98 100 - -- <br /> 09/11/98 - -- -- - -' -' - <br /> 12J15198 1147 -- -- - 01 <br /> 05/14199 111160 - -- - 4 80 <br /> 09/16/99 1170 -- -- •• -- - 24 <br /> 12122199 1156 - - 183 <br /> 02/29/00 1098 -- -- -• - 40 <br /> 06/07/00 -- -- -- -- .. -- -- -- "' -- <br /> 09/25/00 -- -- -- - -- <br /> 12121100 1188 - - - <br /> 03/27/01 1134 - 054 - <br /> =Indicates not measured or sampled For floating product thickness,indicates not detected <br /> TPHg =Total Petroleum Hydrocarbons as Gasoline <br /> TOC =Tap of Casing <br /> MSL =Mean Sea Level DO=Dissolved Oxygen <br /> MTBE =Methyl Tertiary Butyl Ether by EPA Method 8020 ppb=parts per billion <br /> P =Wells purged prior to sample collection mgll=milligrams per liter <br /> NP =Wells not purged pnor to sample collection (c)Tap of well casing altered Well casing has not been resurveyed Water level measured <br /> * =MtBE analytical results(by EPA 8260) from the highest point of well casing <br />