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• - r <br /> It is uncertain whether the presence of the petroleum hydrocarbons <br /> is directly related to the lateral migration of contaminants from <br /> the removed waste oil tank or if the contaminants are being <br /> transported through the groundwater and are being adsorbed onto the <br /> both <br /> soils as the groundwater level occurring coincidentalration ly to <br /> transport mechanisms is probably <br /> varying degrees. <br /> Although clean soil was used to back-fill the tank pit, a limited <br /> amount of contamination may have migrated into these soils from the <br /> above-mentioned processes. <br /> It appears that an area of approximately 40 feet by 40 feet in this <br /> portion of the property has been impacted by actionable levels of <br /> petroleum hydrocarbon contamination. Although the low permeability <br /> clays underlying the site may be acting as a retardant to the <br /> , some off- ite soil <br /> lateral and vertical mi, curred,fespecialiy directly contminantsdown-gradient <br /> contamination mayave h <br /> from the waste oil tank pit. <br /> The vertical extent of contamination will vary, depending on the <br /> principle transport mechanism. Contaminated soils were encountered <br /> at a depth of 6-1/2 feet in the vicinity of the removed waste oil <br /> tank during previous environmental work performed at the site. If <br /> n of the contaminants is occurring, then it <br /> simple lateral migratio <br /> may be expected that soil contamination is present at this depth <br /> outside of the tank pit. If contaminant transport through the <br /> groundwater is the principle made of migration, then the vertical <br />. . dwater <br /> extent of contamination <br /> dwater levebe as �Ifluctuation)h as the e nd may st nextend <br /> level (dependant o g to adsorb <br /> to an unknown depth, depending on the soils affinity <br /> petroleum hydrocarbons. <br /> Southeastern Portion of the Property <br /> The petroleum hydrocarbon Total Oil and Grease was detected at of <br /> a <br /> C of 200:ppm' ins3i1 sTople tal Oileanddfrom a Gre se wasthnot <br /> five feet in soil boring' <br /> detected in the sample collected from a depth of nine feet in the <br /> same boring. Because t vasdetection nex ected£ contamination <br /> s nootherborings were <br /> portion of the property no estimation can be made as to <br /> installed .in this .area. Therefore,. <br /> the lateral ,extent of. this parameter. <br /> i <br /> 1 <br /> PAGE 19 <br /> 275 GRANT LINE ROAD <br />