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5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Laboratory results of soil samples obtained during this Level II Site Assessment indicate <br /> that detectable concentrations of petroleum hydrocarbons and petroleum hydrocarbon <br /> constituents are present within the limits of the EPA 418.1 analytical method. The <br /> results derived from the EPA 418.1 test were not confirmed by the TPH-G or TPH-D <br /> methods and no detectable concentrations of petroleum hydrocarbons or petroleum <br /> hydrocarbon constituents were indicated in the groundwater samples by either of the <br /> laboratory methods. ATEC is therefore of the opinion that the concentrations of <br /> petroleum hydrocarbons and petroleum hydrocarbon constituents detected in the soil <br /> samples by the EPA 418.1 method represent extremely degraded petroleum hydrocarbon <br /> constituents which have transformed into non-discrete, undefinable petroleum <br /> hydrocarbon by-products. The degraded petroleum hydrocarbon constituents do not <br /> contain detectable levels of BTEX compounds or gasoline. <br /> The results of the regulatory review indicate that the three off-site properties suspected <br /> to be of potential concern to the subject site have a relatively low potential to impact the <br /> subject site. Two of the suspect properties are downgradient from the subject site. The <br /> third property is crossgradient from the subject site; low levels of soil contamination <br /> were detected at this property but groundwater is not known to be impacted and it is not <br /> currently the object of regulatory action. <br /> 18 <br />