ARCHIVED REPORTS XR0007820 - Laserfiche WebLink

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In the report,`AGE recommended the use of ground water extraction as an alternative ground water remediation technique at the site Ground water extraction should provide adequate capture of the dissolved hydrocarbons, based on site-specific hydrogeologic conditions and hydrocarbon distnbution The limrted'areal distribution ofhigh concentrations of dissolved h'drocarbons near the source of the release'favors capturing the mayor portion of the dissolved hydrocarbons on the site y A ground water extraction systerh in the source area,along the dawn-gradient portion of significantly ' impacted ground water, should effectively address the plume of impacted ground water AGE +, ' r recommendedApreparation of a remedial action work plan for the installation of additional ground water extraction wells around the former UST area in order to increase 1)the efficiency-o"f-operation' 'R 5 ' of a ground water extraction treatment system and 2)the effectiveness of the ground water extraction systems ability to address the dissolved hydrocarbons „ The AGE-prepared Final Remediation Plan, dated 23 April 2002, recommended the use of ground ` water extraction as an alternative ground water remediation technique at the site, along with soil vapor extraction EHD letter, dated 26 July 2002, issued a denial FRF and requested an additional 'ry4 i cost analysis of remediation technologies µ ' The Ground Water Extraction Clean Up Analysis, dated 31 August 2002, supported the idea that the limited areal distribution of high concentrations of dissolved hydrocarbons near the source of the release favors an aggressive approach, for removing the dissolved hydrocarbon on-site AGE 4 ' recommended a ground water extraction system'in the source area and along the historical down- gradient portion of significantly impacted ground water '. EHD approval letter of FRP technoloy date 28 May 2003 A Final Remediation Plan Addendum, dated 18 July 2003,,was approved by the EHD on 29 July 2003 t SOIL-VAPOR EXTRACTION SYSTEM INSTALLATION The SVE system utilized two-inch diameter, schedule 40 PVC piping installed underground from each well-head at vapor extraction wells and ground water extraction wells EW-1 and EW-2 to the ' inlet of the-vacuum blower, the outlet from the vacuum blower was routed through the catalytic r oxidizing unit A Magnehehc vacuum gauge was attached to the inlet of the blower The air flow was monitored using a Dwyer DS-200 flow sensor The flow from the was determined frothe measured differential pressure and the piping diameter using a`nomograph The vapor stream at the SVE inlet was inomtored for the presence of organic vapor using an OVA ' Sampling ports were installed upstream of the vacuum blower inlet to recover influent soil-gas vapor stream samples, and downstream of the catalytic,converter to recover effluent stream samples to monitor the efficiency of hydrocarbon destruction i SVE System Design and Supplemental Energy, ' 4 ' On 17 November 2003, a Solleco-manufactured EnvioPure 250 catalytic oxidizer soil-vapor • extraction unit (SVE)was delivered tb the site by AGE An SVE network was installed connecting I. ,