(Return matching records with ALLANY of these words.)    ................................................................ state Choose State Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illiniois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississipi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming District of Columbia    regions Choose region Pacific Southwest Midwest Southeast Northeast Mountain-Prairie Alaska California-Nevada All Regions    ................................................................ ................................................................ Journal Entry   Back New Approach Described: The Use of Fluvial Geomorphology to Understand the Nature and Extent of Contamination in Rivers Midwest Region, April 3, 2008 Print Friendly Version An understanding of principles and practices from fluvial geomorphology can be used to greatly improve contaminants data collection and interpretation in rivers and their floodplains.  Lisa Williams, East Lansing ES Field Office, explained the new approach to approximately 80 NRDA practitioners from around the country at the Department of the Interior’s annual NRDA meeting in Phoenix, AZ in April. Traditional characterization of the distribution of contaminants at a hazardous waste site uses samples taken from a rectangular grid and cores sectioned in regular, pre-set intervals. In a river system, fluvial geomorphic features like old oxbows, natural levees, and depositional splays may vary greatly in the amounts of contamination they contain, and vertical layers in sediments and soils may also have very different concentrations of contaminants depending on when they were deposited. By locating samples and dividing cores based on knowledge of these features, a better understanding of the nature and extent of contamination can be obtained than by using a sampling plan based solely on geometry. Lisa described how this approach is being successfully applied at the Tittabawassee River in Michigan and how it is expected to lead to more efficient remediation and restoration there. Contact Info: Midwest Region Public Affairs, 612-713-5313, charles_traxler@fws.gov Send to: From: Notes: ..........................................................................................

Privacy Disclaimer

Feedback/Inquiries

U.S. Fish and Wildlife Service