Article: "Achieving Closure for Multiple TCE Plumes in a Bedrock Aquifer"
"Achieving Closure for Multiple TCE Plumes in a Bedrock Aquifer", Adams, T.V., Murphy, R., The Fifth International Conference on Remediation of Chlorinated and Recalcitrant Compounds, May 2006, Monterey, California.
Chlorinated volatile organic compounds (CVOC) are present in groundwater in a fractured shale/limestone bedrock aquifer at a former electronics manufacturing facility near Kansas City, Missouri (Site). Trichloroethene (TCE; up to 100 mg/l) is the predominant CVOC (along with its breakdown products dichloroethene (DCE) and vinyl chloride) identified at three separate source areas (West Plume, East Plume and South Plume). A remediation program was implemented as part of the closure strategy in order to achieve a “Certification of Completion” determination under the Missouri Department of Natural Resources (MDNR) Voluntary Cleanup Program (10 CSR 25-15.010) Cleanup Levels For Missouri (CALM) Guidance Document. The closure strategy for the soil and groundwater exposure pathways was premised on implementing source reduction technologies coupled with natural attenuation along with guidelines provided in CALM Appendix B (Scenario B Tier 1 Soil Target Concentrations (STARC)), Appendix C (Tier 2 Elimination of Pathways), Appendix D (Tier 3 Distant Point of Compliance for Groundwater Remediation), Appendix E (Institutional Controls), and Appendix G (Engineering Controls). The Tier 3 analysis and use of institutional/engineering controls are the components for achieving a ‘Certification of Completion’ decision demonstrating that there is no risk of exposure on-site to CVOC via the soil and groundwater exposure pathways.
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