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TAR Paoof 16 <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) (mgA) <br /> SMW-1 07/18/96 1285 -- — 3,400 200 <5 130 56 60 - <br /> (conk) 11/15/96 1340 -- — — 2,500 180 <25 62 21 590 -- <br /> 03/14/97 NP 133S -- — — 1,700 130 <0 5 <05 <0 5 230 013 <br /> 06/04/97 NP 1273 — — -- 520 36 31 14 1 5 47 005 <br /> 08/11/97 — — - <br /> 11/17/97 NP 1296 -- -- — <50 <0 5 <0 5 <05 <0 5 290 — <br /> 03/30/98 NP 1215 — -- -- 910 46 <0 5 <05 1 1 110 16 <br /> 06/25198 NP 1270 — -- -- 692 0 666 <0 5 <05 <0 5 765 16 <br /> 09/11/98 NP 1290 -- -- — <50 <0 5 <0 5 <05 <0 5 290 17 <br /> 12/15198 -- -. — — <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 11 35 -- — — <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 <br /> 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 1150 -- — -- — -- — _ -- 480 <br /> 09/16199 1170 2 4 <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=WIm+(b)(p)),where Wlc=water-level <br /> MSL =Mean Sea Level elevation corrected,WIm=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 pnor to sample collection from the highest point of well casing <br /> =MtBE contnmation analytical results(by EPA 8260) <br /> DO = Dissolved Oxygen <br />