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' 10 June 1999 AGE-NC Project No 97-0290 ' Page 24 of 26 8 4 3 Feasibility ' No feasibility testing or studies concerning natural attenuation have been performed at the site Prior ' to initiation of natural attenuation, additional ground water characterization would probably be necessary as it is necessary to demonstrate stability of the ground water plume Fate and Transport modeling may be used to determine whether or not hydrocarbons in ground water pose a threat to ' area receptors Hydrocarbon concentrations are relatively high at the site, and therefore, natural attenuation is probably not a cost-effective method of remediation ' 8 4 4 Estimated Costs ' It is likely that some additional assessment, including additional laboratory analysis of ground water samples would be required to monitor and verify natural attenuation Furthermore, as stated In Section 7 4 4, a long-term monitoring program,perhaps 25 years, would be initiated Generally, the ' cost for natural attenuation would range from$6,000 to $20,000 annually Quarterly monitoring and sampling generally costs between $5,000 to $15,000 annually, report preparation would generally cost between$1,000 to $5,000 annually �i 9.0. RECOMMENDATIONS ' Pursuant to a meeting on 26 Feb teary1999 attended by the prospective purchaser of the subject ' property, AGE and the PHS-EHD, it is our understanding that the subject property will undergo a parcel split in the coming months The southeast portion of the property, where the USTs were formerly located, will retain the present parcel identification The remaining portions of the site will have a new parcel identification The purpose for the parcel split is to allow development of the "new" parcel without directly being subject to environmental remediation and contanunated site status IThe following recommendations for remediation are based upon data collected during the investigation of the property and with regard for the impending parcel split 91 REMEDIATION OF HYDROCARBON-IMPACTED SOIL IPetroleum hydrocarbon-Impacted soil In the vadose zone appears to be centered near wells VW-1, MW2, SWI and S W2 Impacted soil at the site has an estimated diameter of 160 feet and appears to extend downward to a depth of 60 bsg The grei.test volume of impacted soil is present between P3 and SWI at depths of 15 to 25 feet and 35 so 45 feet, soil with declining hyydrocarbon IAdvanced GeoEnvironmental,Inc I