ADVANCED SIMULATION CAPABILITY FOR ENVIRONMENTAL MANAGEMENT (ASCEM): AN OVERVIEW OF INITIAL RESULTS Mark Williamson,* Juan Meza,† David Moulton,‡ Ian Gorton,§ Mark Freshley,§ Paul Dixon,‡ Roger Seitz,¶ Carl Steefel,† Stefan Finsterle,† Susan Hubbard,† Ming Zhu,* Kurt Gerdes,* Russ Patterson,# and Yvette T. Collazo* *U.S. Department of Energy, Office of Environmental Management, Washington, DC, USA †Lawrence Berkeley National Laboratory, Berkeley, CA, USA ‡Los Alamos National Laboratory, Los Alamos, NM, USA §Pacific Northwest National Laboratory, Richland, WA, USA ¶Savannah River National Laboratory, Aiken, SC, USA #U.S. Department of Energy, Carlsbad, NM, USA The US Department Energy (DOE) Office of Environmental Management (EM) determined that uni- form application of advanced modeling in the subsurface could potentially help reduce the cost and risk associated with its environmental cleanup mission. In response to this determination, the EM Office of Technology Innovation and Development (OTID), Groundwater and Soil Remediation (GWS Simulation; Model; Groundwater; ASCEM BACKGROUND: INTRODUCTION TO EM NEEDS Fifty years of nuclear weapons production and government-sponsored nuclear energy research in the US during the Cold War generated large amounts of radioactive wastes, spent fuel, excess plutonium and uranium, thousands of contaminated facilities, and contaminated groundwater and soil. During most of that half century, the nation did not have the environmental regulatory structure or nu- clear waste remediation technologies that exist to- day. The result was a legacy of nuclear waste that was stored and disposed of in ways now considered unacceptable (11). At the end of US Government Fiscal Year 2010 (FY10), EM had 18 funded sites. Estimates report these sites to contain 40 million m 3 of contami- nated soil and 6.4 trillion L of contaminated groundwater (7). Current groundwater and soil re- mediation challenges that will continue to be ad- dressed in the next decade include cost-effective characterization, remediation, and monitoring of contaminants in the vadose zone and groundwater.
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