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• • i <br /> Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2133, Stockton, California <br /> Top-of-casing Depth-to- Product Water-level Change since Concentrations to ltg/L mg/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 I oluene Ethylbenzene Xylenes TPH-G MTBE DO <br /> 9125196 1365 -- -11 11 -2 42 <0 5 <0 5 <0 5 <0 5 <50 <5 -- <br /> 12/4196 1305 -- -1051 0 60 <0 5 <0 5 <0 5 <0 5 <50 1 <5 -- <br /> 3/19/97 865 -- -611 4 40 <0 5 <0 5 <0 5 <0 5 <50 -- 1 62 <br /> MW-5 104 <br /> 318195 1291 -- -11 87 -- 43 4 7 3 3 60 1800 -- -- <br /> 6/2/95 1140 -- -1036 1 51 55 2 7 2 3 75 1300 -- -- <br /> 9111/95 13 65 -- -1261 -2 25 87 3 9 1 29 1500 -- -- <br /> 1215195 1403 -- -1299 -038 120 <10(e) 16 11 2200 -- -- <br /> 3/18196 1082 -- -978 3 21 190 19 24 800 8200 -- -- <br /> 6/18/96 950 -- -846 1 32 170 <25 <25 2500 15,000 <250 -- <br /> 9/25/96 1230 -- -11 26 -280 130 <5 8 4 71 3,800 <50 -- <br /> 12/4/96 11 63 -- -1059 067 88 <2 15 44 4,200 <20 -- <br /> 3/19/97 718 -- -6 14 4 45 26 5 6 4 6 9 8 1,400 -- 0 11 <br /> (a)Corrected water-level elevation value where free product is present(Wlc—Wlm+(b)(p)),where <br /> Wlc=water-level elevation corrected, Wlm=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 <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline by USEPA Method 8015, Modified <br /> MTBE=Methyl Tert-Butyl Ether by USEPA Method 8020 <br /> DO=Dissolved Oxygen <br /> BTEX Distinction by USEPA Method 8020 <br /> i <br /> Wells E-3, E-4, E-5, E-6, E-7, 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 /> i <br /> 47571TABLESU[33MAR7 X1 S <br />