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Antics ated Cost and Time Frame The anticipated time frame to remove the TPHD <br /> plume may be on the order of 5 to 10 years Anticipated costs would include injection <br /> and extraction well and system installation, O&M, costs, and air permit costs These <br /> costs may range from $100,000 to $300,000 depending on equipment selected and <br /> O&M requirements <br /> Conclusions <br /> Implementation of an active remediation approach does not appear to have benefits <br /> based on source removal activities conducted to date, the site setting, and the limited <br /> effectiveness of these approaches for remediation of TPHD impacts The UST removal <br /> and overexcavation of 1,200 cubic yards of soil have removed sources of groundwater <br /> impact and the vertical limits of excavation methods have been reached The site is <br /> located at an industrial location and the water quality of the first encountered water- <br /> bearing zone is generally poor, based on elevated concentrations of chlorides and <br /> sulfates exceeding MCLS Vapor extraction has limited effectiveness for removal of <br /> TPHD impacts and the higher utility costs that would be incurred for thermal desorption <br /> processes make this method not cost effective Groundwater extraction is unfavorable <br /> based upon the number of responsible parties in the site vicinity and potential for <br /> drawing impacts from other sources onto the site Furthermore, the absence of benzene <br /> • and general absence of PAH constituents shows that the site does not represent a threat <br /> to human health <br /> SAON 1PJ212794127941000 ICS-981cbe11 8 fmcon <br /> E-6 Rev 0,8/5/98 <br />