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1 <br /> w <br /> 16 August 2001 <br /> AGE-NC Project No 97-0312 <br />' Page 18 of 20 <br />' 8 3 4 Estimated Costs <br /> It is likely that some additional laboratory analysis of ground water samples would be required to <br /> x <br /> monitor and verify natural attenuation A long-term monitoring program, ranging perhaps from 10 <br /> to 25 years, may be necessary Quarterly monitoring and sampling could cost between $5,000 to <br />' $15,000 annually, report preparation could cost between$4,000 to $6,000 annually Therefore,the <br /> total cost for natural attenuation could range from $9,000 to $21,000 annually <br /> 8 4 NO FURTHER ACTION <br />' Another alternative,the"no further action"alternative,maybe appropriate for the site A"no further <br /> action" recommendation would be made based on the following <br />' • Impacted ground water at the site is limited Samples collected from the two domestic wells <br /> located at the site have not contained confirmed detectable concentration of the constituents <br />' of concern <br /> o Contaminant concentrations have declined significantly in UST-1 and have remained <br />' relatively stable in the other five monitoring wells Samples collected from perimeter wells <br /> contained concentrations that have consistently been below detectable levels <br /> No cost would be associated with Lhe "no further aWon" alternative <br /> I9.0. RECOMMENDATIONS r <br /> AGE has evaluated three methods to remediate hydrocarbon-impacted soil and ground water on the <br /> I <br /> subject site and discussed no further action as a fourth alternative 'In view of site specific conditions, <br /> the principles of the remedial methods,the advantages and disadvantages of each,remedial method <br /> and AGE's experience with each method,AGE recommends that impacted soil acid ground water at <br /> the site be addressed as described below <br />' 9 1 REMEDIATION OF HYDROCARBON-IMPACTED SOIL <br /> 1 <br /> Petroleum hydrocarbon-impacted soil in the vadose zone appears to be limited to the area containing <br /> soil borings B16, UST-3, B28, B6, B23, B8, B27, B22, B29, B13, UST-2, B5, B3 and B25 "The <br /> • plume of impacted soil at the site has an estimated northeast-southwest diameter of approximately <br /> 180 feet, an northwest-southeast diameter of approximately 70 feet and appears to extend locally <br /> I <br /> Advanced GeoEnvironmentai,Inc <br /> I <br /> r <br />