A thermal conductive heating (TCH) pilot test was conducted at the Naval Air Warfare Center (NAWC) in West Trenton, New Jersey in 2009 in collaboration with TerraTherm, Inc., the Naval Facilities Engineering Services Center and the United States Geological Survey. The NAWC site was historically used as a jet engine testing facility from the mid-1950s to the late 1990s. During this time, the subsurface was contaminated with trichloroethylene (TCE) which was a common solvent used at the facility. The pilot test consisted of 15 heater/extraction wells installed to a depth of 16.8 m in weathered mudstone and operated for 102 days. Rock core samples were taken pre- and post-remediation to measure the initial TCE concentrations and evaluate the effect the TCH pilot test had. The data collected during the pilot test was used to create a two-dimensional (2D) finite difference model using TMVOC. TMVOC is part of the TOUGH 2 family of codes and is a numerical model that is capable of simulating multiphase flow, heat transfer and transport of volatile organic compounds in three-dimensional heterogenous porous media or fractured rock. The 2D model was used as a screening model to investigate TCE removal from the rock matrix when heating for 100 days with a similar heating pattern to what was employed at the NAWC site. The numerical domain incorporated three primary fractures with competent bedrock in between. As the test pilot was conducted in the weathered bedrock zone, a sensitivity analysis was first completed on the matrix permeability to help to match the TCE removal from the pilot test. The pilot test had a 63.5% removal of TCE from the study area compared to 67% from the baseline model. A limited sensitivity analysis was completed which investigated how the matrix porosity and rate of energy application would have on the success of TCE removal from the rock matrix. It revealed that the TCE removal increases with increased matrix porosity and increased rate of energy application. / Thesis (Master, Civil Engineering) -- Queen's University, 2013-01-02 22:32:05.274

Hur kan livscykelanalyser bistå riskvärderingen vid val av åtgärdsmetod? I det här examensarbetet undersöktes hur resultaten från livscykelanalyser kan användas i beslutstödsverktyget SAMLA för förorenade områden för att bistå val av åtgärdsmetod vid Finspångs centraltvätt. Examensarbetet har genomförts i samarbete med Structor Miljö Öst AB. Livscykelanalyser har utförts för två olika typer av åtgärdsmetoder in situ, stimulerad anaerob reduktiv deklorering samt elektrisk konduktiv uppvärmning. Tidigare studier har visat att olika livscykelanalysmetoder ger olika resultat. Även den här studien bekräftar det. Därför bör inte resultat från olika metoder jämföras. Livscykelanalyser kompletterar SAMLA för förorenade områden väl. De procentuella förhållandena beräknades mellan åtgärdsmetodernas miljö- och klimatpåverkan. I värderingssteget i SAMLA bedöms åtgärdsalternativens påverkan i jämförelse med nollalternativet. En bedömning gjordes av respektive åtgärdsalternativ och korrigering av förhållandet mellan metoderna utfördes genom att samma procentuella förhållande som beräknats fram för miljöbelastningen respektive klimatpåverkan beräknades för värderingspoängen. Med stöd av livscykelanalyser samt riskvärdering bör efterbehandlingsmetoden stimulerad anaerob reduktiv deklorering väljas för Finspångs centraltvätt. / How can life cycle analyzes assist the risk assessment when choosing a remediation method? In this thesis, it was investigated how the results from life cycle analyzes can be used in the decision support tool SAMLA for contaminated sites to assist in the choice of remediation method at Finspång's Centraltvätt. The thesis has been carried out in collaboration with Structor Miljö Öst AB. Life cycle analyzes have been performed for two different types of in situ remediation methods, Enhanced Reductive Dechlorination and Electrical Conductive Heating. Previous studies have shown that different life cycle analysis methods lead to different results. This study also confirms this. Therefore, results from different methods should not be compared. Life cycle analyzes complement SAMLA for contaminated sites. The percentage ratios were calculated between the remediation methods' environmental and climate impact. In the valuation step in SAMLA, the impact of the remediation alternatives is assessed in comparison with the no action alternative. An assessment was made of the respectively remediation alternatives and a correction of the relationship between the methods was performed by calculating the same percentage ratio that was calculated for the valuation points of the environmental and climate impact. With the support of the life cycle analysis and the risk assessment the remediation method Enhanced Reductive Dechlorination should be chosen for Finspång's Centraltvätt.