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Table 2. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 5450, Stockton, California <br /> t Change <br /> Top-of-casing Depth -to- Product Water-level since last Concentrations in in <br /> Well number elevation, water, thickness, elevation, measurement, Total <br /> and date in feet in feet in feet in feet in feet Benzene Toluene Ethylbenzene Xylenes TPH-G <br /> ft <br /> MW-1 <br /> 7/30/96 0.54 <0.5 <0.5 <0.5 <50 35 <br /> 11/15/96 12.37 <0.5 <0.5 <0.5 <0.5 <50 8 <br /> 3/19/97 8.89 -3.48 <0.5 <0,5 <0.5 <0.5 <50 19 0.26 <br /> Notes: Dash indicates of measured or calculated. <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline <br /> MTBE=Methyl Tertiary Butyl Ether <br /> DO=Dissolved Oxygen,field measurement. <br /> i <br /> i <br /> 4 87OUA B L E M54 50M A V A LS <br />