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i1.2 Site Contamination <br /> Potential site contamination may be addressed in several functional areas, <br /> namely, the presumed leakage of diesel and or asphalt diesel mixtures from USTs east <br /> ' of MW 1 and possible spillage from the loading rack area, further to the east The <br /> proximity of both potential sources makes it difficult to distinguish the initial source(s) as <br /> ' the areas overlap <br /> 1 While contamination of underlying soil ranges up to 15,000 mg/kg of "diesel" <br /> hydrocarbons, detected levels have generally been much lower Extent of higher <br /> contaminated soil is unknown Assuming it covers an area along the eastern side of the <br /> previous UST removal and extends along 100 FT to the site's northeastern corner the <br /> area would be about 10,000 e-The average depth of significant contamination <br /> ' appears to approach 15 FT With an average diesel contamination of 1,000 mg/kg the <br /> potential entrapped diesel like contamination could be 2,000 GA Absent more sampling, <br /> ljo <br /> this calculation is very speculative, but is indicative of the expected order of magnitude of { � <br /> contamination <br /> The identified hydrocarbon mass may be mobilized by precipitation infiltration and <br /> Iposses a threat as an uncontrolled source of contamination to down gradient ground <br /> water Its accessible location and high level of pockets of contamination suggest this <br /> source's removal and remediation Additionally, the examination of the excavation's side <br /> walls as they are exposed will offer more insight into the extent of contamination <br /> Agency 13 A g cy D iscussions <br /> Discussions between Mr ,teff Hopkins and Dr Hans Ho, Western Oil & Spreading <br /> and Mr Dan Barber P E have ensued during the characterization with Mr Jeff Wong <br /> ' REHS, PHS/EHD regarding closure by WO&S <br /> ' 1-4 <br /> 1 <br />