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Table 4. Historical Groundwater Sample Results Continued, ARCO Facility 434,Lodi,California Monitoring well number and Concentrations in gg/L date sampled Benzene Toluene Ethylbenzene Xylenes TPH-G(a) MTBE 8/18/92 <0.5 <0.5 <0.5 <0.5 <50 -- 11/17/92 <0.7(h) <0.5 <0.5 <0.5 59 -- 2/23/93 <0.5 <0.5 <0.5 <0.5 <50 -- 5/26/93 <0.5 <0.5 <0.5 <0.5 <50 -- 8123/93 <0.5 <0.5 <0.5 <0.5 <50 -- 11/16/93 <0.5 <0.5 <0.5 <0.5 <50 -- 3122/94 <0.3 <0.3 <0.3 <0.5 <10 -- 6/23/94 <0.3 <0.3 <0.3 <0.5 <10 -- 9/28/94 <0.5 <0.5 <0.5 <0.5 <50 -- 12/19/94 <0.5 <0.5 <0.5 <0.5 <50 -- 3/2/95 <0.5 <0.5 <0.5 <0.5 <50 -- 5/19/95 <0.5 <0.5 <0.5 <0.5 <50 -- 8/11/95 <0.5 <0.5 <0.5 <0.5 <50 IIA 7/95 (f) -- -- -- -- -- 2/14/96 <0.5 0.51 <0.5 4.4 <50 -- 5/9/96(f) -- -- -- -- -- W-12 4/23/90 <0.3 2.3 <0.3 0.9 -- -- 10/04/90 <0.5 <0.5 <0.5 <0.5 -- -- 2/2/91 <0.5 <0.5 <0.5 <0.5 -- 4/17/91 <0.5 <0.5 <0.5 <0.5 <50 -- 7/24/91 6.9 <0.5 <0.5 <0.5 90 -- 10/23/91 25 <0.5 <0.5 <0.5 100 -+ 2/10/92 12 <0.5 <0.5 <0.5 95 5112/92 48 <0.5 <0.5 <0.5 170 -- 8/18/92 29 <0.5 <0.5 <0.5 180 -- 11/17/92 11 <0.5 <0.5 <0.5 <50 -- 2/22/93 <0.5 <0.5 <0.5 <0.5 <50 -- 4/23/93 <0.5 <0.5 <0.5 <0.5 <50 -- 5/26/93 <0.5 <0.5 <0.5 <0.5 <50 -- 8/23/93 <0.5 <0.5 <0.5 <0.5 <50 11/16/93 <0.5 <0.5 <0.5 <0.5 <50 -- 3/22/94 <0.3 <0.3 <0.3 <0.5 <10 -- 6/23/94 <0.3 <0.3 <0.3 <0.5 <10 -- 9/28/94 <0.5 <0.5 <0.5 <0.5 <50 -- 12/19/94 <0.5 <0.5 <0.5 <0.5 <50 -- 3/2/95 <0.5 <0.5 <0.5 <0.5 <50 -- 5/19/95 <0.5 <0.5 <0.5 <0.5 <50 -- 8/11/95 <0.5 <0.5 <0.5 <0.5 <50 -- 11/17/95 (f) -- -- -- -- -- -- 2/14/96 <0.5 <0.5 <0.5 3.3 <50 -- 5/9/96(f) -- -- -- -- -- -- (a)Total petroleum hydrocarbons as gasoline. (b)Well obstructed. (c)New well replaced in same borehole as former well W-2. (d)Well dry. (e)Insufficient water for sampling. (f) Well on a semi-annual sampling schedule. Sampled during the 1st and 3rd quarters of each year. (g) Raised MRL due to high analyte concentration requiring sample dilution. (h)Raised MRL due to matrix interference. . (i)Benzene concentration measured this quarter appears to be anomalous. 0)Well inaccessible. Note: Dash indicates not measured or analyzed.