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0 0 0 <br /> Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093, Tracy, California <br /> Floating Change Concentrations in µg/L m <br /> Top-of-casing Depth-to- product Water-level since last <br /> Well number elevation, water, thickness elevation, measurement, Total <br /> and date in feet(a) in feet in feet in feet(b) in feet Benzene Toluene Eth lbenzene Xylenes TPH-G MTBE DO <br /> 6/4/97 -- -- -- -- -- -- -- -- -_ <br /> 8/11/97 1171 -- -- -- -- -- -- -- -- -- 045 <br /> 11/17/97 1178 -- __ 007 <br /> (a)All elevations corrected to an arbitrary datum based on a Notes Dash indicates not measured or sampled <br /> temporary on-site benchmark with an assigned elevation of 50 feet TPH-G=Total Petroleum Hydrocarbons ds Gasoline by EPA Melhod 8015,Modified <br /> (b) Corrected water level elevation value(Wlc=Wlm+(b)(p)),where Wlc=water-level BTEX Distinction by EPA Method 8020 <br /> elevation corrected, Wlm=water-level elevation measured,b=liydrocarbon MTBE= Methyl Tertiary Butyl Ether by EPA Method 8020 <br /> thickness(feet), p=specific gravity(0 7)of hydrocarbon DO=DissoIved Oxygen <br /> (c)Top of well casing altered Well casing has not been resurveyed P= Wells purged prior to sample collection <br /> Water level measured from the highest point of well casing NP= Wells not purged prior to sample collection <br /> Sampled during thelst and 3rd quarters of each year <br /> Wells ATR-1,ATR-3,ArR-6,ATR-9,ATR-10,and ATR-i 1 on a Duni-diHiudl sampling tiihLduk. <br /> 47471TABLE512093NOV7 XLS <br />