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1 Report of Findings <br /> Frontier Transportation <br />' 03-28-98 <br /> March 28, 1998 <br /> site. <br /> 8.0) RECOMMENDATIONS <br />' After comparison of the effectiveness of intrinsic and enhanced remediation methods, BEI, <br /> Inc. recommends that passive bioremediation be monitored as cleanup of residual petroleum <br />' hydrocarbons at this site. Residual petroleum hydrocarbons are confined to dissolved phase in the <br /> shallow groundwater in monitoring well MW-3 only. No free phase petroleum product was ever <br /> identified in the shallow groundwater and no drinking wells are screened in this water body. <br /> ' It has been identified by the Lawrence Livermore National Laboratories (LLNL) review <br /> and the National Academy of Sciences and others that enhanced treatment of shallow <br /> ' groundwater is unwarranted for shallow groundwater which is impacted exclusively by dissolved <br /> petroleum as exists at this site. Intrinsic biodegradation has been identified as effective <br /> remediation for isolated, dissolved petroleum hydrocarbons. It is recommended, therefore, that <br /> ' quarterly groundwater sampling be performed for a period no greater than two years to identify <br /> passive bioremediation of dissolved phase petroleum hydrocarbons that exist beneath the site. <br /> ' . Should dissolved phase petroleum hydrocarbons identify an attenuation in concentration, then a <br /> request for closure of mitigation will be submitted to the PHS/EHD. <br /> 1 <br /> 8 <br />