Laserfiche WebLink
0 <br /> Table 1. Summa f • 0 <br /> Summary o Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093, Tracy, California <br /> Floating Change Concentrations inµg/L ni <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 Ethylbenzene Xylenes TPH-G MTBE DO <br /> 7/18/96 1152 -- -017 -- -- -- -- -- -- __ <br /> 11/15/96 1230 -- -- -0 78 -- -- -- -- -- -- -- <br /> 3/14/97 -- -- -- -- -- -- -- -- -- -- -- <br /> 6/4/97 <br /> (a)All elevations corrected to an arbitrary datum based on a <br /> temporary on-site benchmark with an assigned elevation of 50 feet <br /> (b) Corrected water level elevation value(Wlc=Wlm+(b)(p)), where Wlc=water-level <br /> elevation corrected, Wlin=water-level elevation measured,b=hydrocarbon thickness(feet), <br /> p=specific gravity(0 7)of hydrocarbon <br /> (c)Top of well casing altered Well casing has not been resurveyed Water-level measured <br /> from the highest point of well casing <br /> Notes Dash indicates not measured or sampled <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015, <br /> Modified <br /> BTEX Distinction by EPA Method 8020 <br /> MTBE=Methyl Tertiary Butyl Ether by EPA Method 8020 <br /> DO=DissoIved Oxygen <br /> P= Wells purged prior to sample collection <br /> NP=Wells not purged prior to sample collection <br /> Wells ATR-1, ATR-3, ATR-6, ATR-9, ATR-10, and ATR-11 on a <br /> semi-annual sampling schedule Sampled during theist and 3rd quarters <br /> of each year <br /> 47471TABLESI20931UN7 XLS <br />