ARCHIVED REPORTS_XR0012524 - Laserfiche WebLink

Home Browse Search

' 05 May 1997 01 AGE-NC Project No 95-0173 ' Page 28 of 29 ' continue the remediation to acceptable levels Operation of the SVE system at the site should be capable or removing between 80 and 90 percent of volatile contaminant by volume 92 REMEDIATION OF HYDROCARBON-IMPACTED GROUND WATER ' An in-situ remediation method would be more effective, from a cost and operation perspective, over a "pump and treat" method Both in-situ methods (air sparging/soil vapor extraction and ' bioremediation)described in this CAP could be effective to remediate the site However, based upon limited regulatory acceptance and uncertain monitoring requirements, in-situ bioremediation of ground water may not be the most cost-effective remedial alternative for the site ' Remediation of impacted ground water in the"core"area should be conducted concurrently with soil remediation to prevent re-contamination of remediated soil In-situ air sparging/vapor extraction appears to be a viable alternative for remediation of both soil and ground water in the vicinity of the former UST location The system used for soil vapor extraction could also be used for the air sparging/extraction system A sparging/extraction system will also have a secondary effect of 10 bioventing and increasing the natural degradation rate Combined with SVE, the IAS method mechanically strips hydrocarbons without the addition of any ' chemicals or microbe solution into the environment It is a better known and more widely accepted method of volatilizing hydrocarbons As IAS has few, if any, adverse environmental effects, it is likely to be more readily approved for implementation by regulatory agencies A 12- to 24-month remediation period can be expected to reduce concentrations to a level suitable for closure consideration Ground water remediation alternatives, estimated durations and associated costs for the site are summarized on Table 7 ' In summa AGE recommends the following actions for remediation of hydrocarbon-impacted rY, g ground water at the site • Complete assessment of the dissolved petroleum-hydrocarbon plume • Preparation of a Remedial Action Work Plan detailing the proposed installation and operation of the IAS system This work plan should include the installation of sparging points and extraction wells • Installation of a compressor or blower-driven IAS system at the site concurrently with the proposed SVE system • Air should be supplied to IAS points pa-underground piping from an IAS unit capable of approximately 10 to 15 psi t o rate of 2 to 5 scfm -�-�-- Advanced GeoEmuonmental,inc