Natural Attenuation Software (NAS) Application and Demonstration Case Study

Source-Area Containment of a Trichloroethene Plume, Operable Unit 2, Hill Air Force Base, Davis County, Utah
Operable Unit 2 on Hill Air Force Base, Davis County, Utah, is the location of two unlined trenches that were used for the disposal of waste solvents. The trenches are the source area for a plume of trichloroethene in the subsurface. Ground-water monitoring data from a remedial action to contain the source area is being used to evaluate the ability of the Natural Attenuation Software (NAS) package to estimate cleanup times associated with combining the remediation of a contaminant source-area with using Monitored Natural Attenuation (MNA) to remediate the remaining downgradient contaminant plume. This site is one of eight demonstration sites that make up a diverse set of geologic, hydraulic, and geochemical environments. The evaluation is being conducted by the U.S. Navy, Virginia Polytechnic Institute and State University (Virginia Tech), and U.S. Geological Survey (USGS), with funding from the Environmental Security Technology Certification Program (ESTCP).

Site Information

• Hill Air Force Base, Superfund Program, U.S. Environmental Protection Agency (USEPA)
• Hill Air Force Base, National Priorities List (NPL), Superfund Program, USEPA
• Bioremediation Field Initiative Site Profile: Hill Air Force Base Superfund Site (EPA/540/F-95/506C) (pdf), Technology Innovation Program (TIP), USEPA

NAS Information

• New Version of NAS (Natural Attenuation Software) Available
• Software Provides Estimates of How Long it Will Take for Remediation Efforts to Achieve Their Goals
• Estimating Cleanup Times Associated with Combining Source-Area Remediation with Monitored Natural Attenuation (ER-0436), ESTCP Project Description
• Natural Attenuation Software (NAS) Web Site, A web site where potential users can download the latest NAS software, documentation, and tutorials

Other NAS Demonstration Case Studies

• A Landfill Leaking Chlorinated Ethenes, U.S. Naval Submarine Base Kings Bay, Georgia
• Biodegradation of Chlorinated Ethenes and Benzenes, Site 3, Naval Air Station (NAS) Cecil Field, Jacksonville, Florida
• Biodegradation of Chlorinated Ethenes in Fractured Dolomite, Textron Realty Operations Incorporated, Niagara Falls, New York
• Natural Attenuation of a Chlorinated Benzene Plume, U.S. Naval Air Station in Pensacola, Florida
• Natural Attenuation of Chlorinated Ethenes in a Seasonally Cold Environment, Peger Road Operations and Maintenance Facility, Fairbanks, Alaska
• Natural Attenuation of Ground Water Contaminated with Chlorinated Volatile Organic Compounds, Naval Air Engineering Station (NAES), Lakehurst, New Jersey
• Remediation of Trichloroethylene-Contaminated Ground Water, Ash Landfill, Seneca Army Depot Activity, Romulus, New York

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