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Table 4 Historical Groundwater Sample Results Continued, <br /> ARCO Facility 434,Lode,California <br /> Monitoring well <br /> number and Concentrations in ggfL <br /> date sampled Benzene Toluene Ethylbenzene Xylenes TPN-G(a) MTBE <br /> 8/18/92 <0 5 <0 5 <0 5 <0 5 <50 <br /> 11117/92 <0 7(h) <0 5 <0 5 <0 5 59 -- <br /> 2/23/93 <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 <0 3 <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 /> 3/2/95 <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(f) -- -- -- -- -- -- <br /> 2/14/96 <0 5 0 5 1 <0 5 44 <50 -- <br /> 5/9/96(f) -- -- -- -- -- -- <br /> W-12 <br /> 4/23190 <0 3 23 <0 3 09 -- -- <br /> 10/04/90 <0 5 <0 5 <0 5 <0 5 -- <br /> 2/2/91 <0 5 <0 5 <0 5 <0 5 -- -- <br /> 4/17/91 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 7/24/91 69 <0 5 <0 5 <0 5 90 -- <br /> 10/23/91 25 <0 5 <0 5 <0 5 100 -- <br /> �S 2/10/92 12 <0 5 <0 5 <0 5 95 =_ <br /> 5/12/92 48 <0 5 <0 5 <0 5 170 <br /> 8/18192 29 <0 5 <0 5 <0 5 180 <br /> 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 <0 3 <0 3 <0 3 <0 5 <10 -- <br /> 6/23/94 <0 3 <0 3 <0 3 <0 5 <10 -- <br /> 928/94 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 12/19/94 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 32/95 <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 11/17/95 (f) -- -- -- -- -- <br /> 2/14/96 <0 5 <0 5 <0 5 33 <50 -- <br /> 5/9/96(f) -- -- I I -- -- -- <br /> (a)Total petroleum hydrocarbons as gasoline <br /> (b)Well obstructed <br /> (c)New well replaced in same borehole as former well W-2 <br /> (d)Well dry <br /> (e)Insufficient water for sampling <br /> (f) Well on a semi-annual sampling schedule Sampled during the 1 st and 3rd quarters of each year <br /> (g)Raised MRL due to high analyte concentration requermg sample dilution <br /> (h)Raised MRL due to matrix interference <br /> (i)Benzene concentration measured this quarter appears to be anomalous <br /> 0)Well inaccessible <br /> Note Dash Indicates not measured or analyzed <br />