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Table 3. Analytical Results for <br /> ARCO Facility 434,Lodi, California <br /> Monitoring well <br /> number and Concentrations in L <br /> date sam led Benzene Toluene Eth Ibenzene Xylenes TPH-G MBTE <br /> 2/10/92 12 <0.5 <0.5 <0.5 95 -- <br /> 5/12/92 48 <0.5 <0.5 <0.5 170 -- <br /> 8/18/92 29 <0.5 <0.5 <0.5 180 11/17/92 11 <0.5 <0.5 <0.5 <50 -- <br /> 2/22/93 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 4/23/93 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 5/26/93 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 8/23/93 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 11/16/93 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 3/22/94 <03 <0.3 <0.3 <0.5 <10 -- <br /> 6/23/94 <0.3 <0.3 <0.3 <0.5 <10 -- <br /> 9/28/94 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 12/19/94 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 312/95 <0.5 <0.5 <0.5 <0.5 <50 <br /> 5/19/95 <0.5 <0.5 <0.5 <0.5 <50 <br /> 8/11/95 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 11/17/95 (e) <br /> 2/14/96 <0.5 <0.5 <0.5 3.3 <50 -- <br /> . 5/9/96 (e) -- -- -- -- -- -- <br /> 9/6/96 <0.5 <0.5 <0.5 <0.5 <50 <5 <br /> (a)Well obstructed. <br /> (b)New well replaced in same borehole as former well W-2. <br /> (c)Well dry. <br /> (d)Insufficient water for sampling. <br /> (e) Well on a semi-annual sampling schedule. Sampled during the 1 st and 3rd quarters of each year. <br /> (f)Raised MRL due to high analyte concentration requiring sample dilution. <br /> (g)Raised MRL due to matrix interference. <br /> (h)Benzene concentration measured this quarter appears to be anomalous. <br /> (i)Well inaccessible. <br /> Q) TPH-G concentration measured this quarter appears to be anomolous. Well is located upgradient <br /> or crossgradient of former source area. <br /> TPH-G=Total petroleum hydrocarbons as gasoline <br /> MTBE=Methyl Tert-Butyl Ether <br /> Note: Dash indicates not measured or analyzed. Bold indicates samples were analyzed this quarter. <br /> 3382%TABLES1434SEP6.XLS <br />