Leeson NARPM SERDP ESTCP Info Session June 2009_hs.pdf

Verification of Methods for Assessing theSustainability of Monitored Natural AttenuationLead Investigators:Carmen Lebrón, NAVFAC ESCMark Widdowson, Ph.D., Virginia TechFrank Chapelle, Ph.D., USGSJack Parker, Ph.D., University of TennesseeObjectives:To dem/val an integrated methodology for assessing long-term sustainability of MNAwhich captures the full range of NA processes (diminishing source mass flux, dilutionand dispersion, biological and abiotic transformations, volatilization, andevapotranspiration).• Validate a methodology for calculating bioavailable organic carbon (BOC) by establishingcorrelations with field-measured dissolved oxygen (DO) and chloroethene concentrations,concentrations of natural organic carbon compounds present in aquifer sediment, and rateand extent of reductive dechlorination;• Verify upscaled source zone depletion (SZD) function using site contaminant concentrationdata for a range of source zone geometries• Validate short term sustainability using BOC and DO concentration data and demonstrate longterm sustainability of MNA using SEAM3D v.2.1 at four sites where time of remediation isestimated using the SZD function. Product: framework & methods as well as an interactive computational tool toassess the long-term sustainability of MNA-based remediation strategies. Estimated completion: late 201019th Annual NARPM Training Conference • June 2-5, 2009 • Atlanta, Georgia 35