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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2133, Stockton, California <br /> i <br /> Top-of-casing Depth-to- Product Water-level Change since i Concentrations in pg/L <br /> Well number elevation, feet water, thickness, elevation, last measurement, Total <br /> and date above mean sea level in feet in feet in feet(a) in feet Benzene Toluene Ethylbenzene Xylenes TPH-G MTBE <br /> MW-5 1 04 <br /> 318195 1291 -- -11 87 -- 43 4 7 3 3 60 1800 -- <br /> 612/95 1 1 40 -- -1036 1 51 55 2 7 2 3 75 1300 <br /> 9/11/95 1365 -- -1261 -225 87 3 9 1 29 1500 -- <br /> 12/5/95 14 03 -- -1299 -038 120 <10(e) 16 11 2200 -- <br /> 3/18/96 1082 -- -978 3 21 190 19 24 800 8200 -- <br /> 6/18196 950 -- -846 132 170 <25 <25 2500 15,000 <250 <br /> 9125196 1230 -- -1126 -2 80 130 <5 8 4 71 3,800 X50 <br /> (a)Corrected water-level elevation value where free product is present(Wlc=Wlm+(b)(p)),where <br /> Wlc=water-level elevation corrected, Wim=water-level elevation measured, b=hydrocarbon thickness(in <br /> feet),p=specific gravity(0 7)of hydrocarbon <br /> Notes Dash indicates not measured or not calculated c <br /> TPH-G =Total Petroleum Hydrocarbons as Gasoline by USEPA Method 8015,Modified <br /> MTBE= Methyl Tert-Butyl Ether by USEPA Method 8020 <br /> BTEX Distinction by USEPA Method 8020 <br /> Wells E-3, E-4, E-5, E-6, E-7, PR-1, PR-2, BHD-2 MW-1, MW-2,and MW-3 on a semi-annual sampling schedule <br /> Sampled during the first and third quarters of each year <br /> 33161TABLESU133SEP6 XiS <br />