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Table 1. Summa of Groundwater Mon>I'torin Data- Water Elevations and <br /> Summary g Analyses <br /> ARCO Facility 2133, Stockton, California <br /> Top-of-casing Depth-to- Product Water-level Change since Concentrations in pg/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 Till l-G MTBE DO <br /> 3/18/96 1025 -- -771 521 <0 5 <0 5 <0 5 <0 5 58 --6/18/96 1123 -- -869 -098 <0 5 <0 5 <0 5 <0 5 <50 <5 -- <br /> 9/25/96 13 65 -- -11 11 -242 <0 5 <0 5 <0 5 <0 5 <50 <5 -- <br /> 12/4/96 13 05 -- -1051 060 <0 5 <0 5 <0 5 <0 5 <50 <5 <br /> 3/19197 865 -- -6 11 440 <0 5 <0 5 <0 5 <0 5 <50 -- l 62 <br /> 615/97 NP 1035 -- -781 -170 <0 5 <0 5 <0 5 <0 5 <50 <5 156 <br /> MW-5 1 04 <br /> 3/8/95 1291 -- -1187 -- 43 47 33 60 1800 -- -- <br /> 6/2195 1140 -- -1036 151 55 27 23 75 1300 --9/11/95 13 65 -- -1261 -225 87 3 9 1 29 1500 -- -- <br /> 12/5/95 1403 -- -1299 -038 120 <10(e) 16 11 2200 <br /> 3/18/96 1082 -- -978 321 190 19 24 800 8200 -- -- <br /> 6118/96 950 -- -846 1 32 170 <25 <25 2500 15,000 <250 -- <br /> 9/25/96 1230 -- -11 26 -280 130 <5 84 71 3,800 <50 -- <br /> 12/4/96 11 63 -- -1059 067 88 <2 15 44 4,200 <20 <br /> 3/19/97 7 18 -- -6 14 445 26 56 46 98 1,400 -- 0 11 <br /> 6/5/97 P 884 -- -780 4 66 22 51 4 14 1,900 <10 0 17 <br /> I <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 /> BTEX Distinction by USEPA Method 8020 <br /> MTBE=Methyl Tert-Butyl Ether by USEPA Method 8020 <br /> DO=Dissolved Oxygen <br /> P= Well purged prior to sample collection <br /> NP= Well not purged prior to sample collection <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 /> 47571TABLLS121333UN7 XLS <br />