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Elizabeth Thayer <br /> August 21, 1995 <br /> Page 4 <br /> It should be pointed out that BTEX compounds which normally drive the risk associated <br /> with hydrocarbon contamination, have never been detected in any of the nine groundwater <br /> sampling events <br /> CONCLUSIONS <br /> McLaren/Hart still believes that the model presented as part of the risk assessment is <br /> correct The model shows that the petroleum hydrocarbons in the soil, conservatively <br /> modeled as tetradecane, will not migrate appreciably toward groundwater <br /> The analytical results of the groundwater samples do not present evidence of diesel or other <br /> petroleum hydrocarbons constituents In other words, there is no evidence of any leaching <br /> of soil contaminants The "unidentified hydrocarbons" that are sporadically present at low <br /> levels could simply be naturally occurring organic material (e.g rotting leaves) or a <br /> laboratory contaminant <br /> After reviewing the recent groundwater monitoring events, we still concur with the findings <br /> O of our Risk Assessment and Closure reports which demonstrate that the chemicals detected <br /> in the groundwater below the Site are not Site-related, and that the petroleum hydrocarbons <br /> in the soil can be left in place without any significant environmental impact. Therefore, we <br /> recommend that groundwater monitoring activities be terminated and the Site be closed <br /> If you have any questions regarding the contents of the report or require further <br /> information, please call Stephanie Chute or Richard Richter at (714) 756-2667 or Del <br /> Monte Corporation's legal counsel, Don Nanney at (213) 617-8000 <br /> Sincerely, <br /> /Ri"chard <br /> Stephanie M Chute O Richter, Ph.D , P E. <br /> Associate Health Scientist Principal Engineer <br /> Enclosures <br /> cc Gregory L Evans - Hill, Farrer & Burrill <br /> Don Nanney - Gilchrist & Rutter <br /> Jeffrey Seilbach - Del Monte Corporation <br /> B 1g\B1khM10601994 ooilrwqcbgwr sum <br /> CLG�M§q <br /> A Division of McLaren/Hart <br /> Environmental Engineering G� <br /> Q y rocW+ed orae. <br />