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Table 1 Page 18 of 18 <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 TPHg Benzene Toluene Ethylbenzene Xylenes MTBE DO <br /> Sampled {feet MSL) (feet TOC) in feet (feet,MSL) (feet) b) ( b (ppb) (mgrl) <br /> 11/17/97 NP 1296 <50 <0 5 <0 5 <0 5 <0 5 290 -- <br /> SMW 1 03/30/98 NP 1215 910 46 <05 <05 1 1 ii0 16 <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) 1236 <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 /> 07118!96 1152 - -- -. .- .. <br /> 11/15/96 1230 -- -. <br /> 03/14/97 .. _. .. <br /> 06/04/97 <br /> 08/11/97 <br /> 11/17/97 - <br /> -- -- -- -- -- - - <br /> 03/30/98 1100 <br /> 06/25/98 100 -- -- _ <br /> 09/11/98 _ <br /> 12/15/98 1147 - - - 01 <br /> 05/14/99 11 50 -- _ 480 <br /> 09/16/99 11 70 - - 24 <br /> 12/22/99 11 56 - 1 83 <br /> 02/29/00 1098 - -- -- -- 40 <br /> 06/07/00 -- <br /> 09/25/00 <br /> 12/21/00 11 88 <br /> =Indicates not measured or sampled For floating product thickness,indicates not detected <br /> TPHg =Total Petroleum Hydrocarbons as Gasoline <br /> TQC =Top of Casing <br /> MSL =Mean Sea Level <br /> MTBE =Methyl Tertiary Butyl Ether by EPA Method 8020 ppb=parts per billion <br /> P =Wetls purged prior to sample collection mg/1=milligrams per liter <br /> NP =Wells not purged prior to sample collection (c)Top of well casing altered Well casing has not been resurveyed Water level measured <br /> =MtBE ana4ytical results(by EPA 8260) from the highest point of well casing <br /> DO =Dissolved Oxygen <br />