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Tab Past 18 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station 42093 <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 00 <br /> Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mgll) <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 <0 5 <0 5 1 1 110 16 <br /> (cant) 06(25!98 NP 1270 -- -- -- 692 0 666 <0 5 <0 5 <0 5 766 16 <br /> 09/11/98 NP 1290 -- -- -- <50 <0 5 <0 5 <0 5 <0 5 290 17 <br /> 1211 M8 -- - - -- - - - - -- <br /> Well no longer monitored or sampled <br /> i <br /> TEX-1 10/26/95 (c) 1286 -- -- -- <350 <5 <0 5 <0 5 <0 5 <br /> 02!12/96 1090 -- - -- -- -- -- - - <br /> 04118(96 1135 -- -- -- <50 <0 5 <0 5 <0 5 <0 5 <br /> 07118(96 1152 -- -- -- -- - -- <br /> 11/16/96 1230 -D3/14/97 -- -- -- -- - <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 /> 12115/98 1147 -- -- -- -- - - -- 01 <br /> 05/14/99 11160 -- -- - - 480 <br /> 09/16/99 1170 - - -- -- 24 <br /> 12/22/99 1156 -- -- - 183 <br /> 02/29/00 1098 -- -- - 40 <br /> 06/07/00 _ <br /> 09/25/00 <br /> =Indicates not measured or sampled For SPH,indicates not detected (c)Top of well casing altered Well casing has not been resurveyed Water level measured <br /> TPHg =Total Petroleum Hydrocarbons as Gasoline from the highest point of well casing <br /> TOC =Top of Casing <br /> MSL =Mean Sea Level <br /> MTBE =Methyl Tertiary Butyl Ether by EPA Method 8020 <br /> P =Wells purged prior to sample collection <br /> NP =Wells not purged prior to sample collection <br /> =MtBE confirmation analytical results(by EPA 8260) <br /> DO =Dissolved Oxygen <br />