||Geological Survey, Reston, VA.; Wisconsin Dept. of Natural Resources, Madison.; Earth Tech., Inc., San Antonio, TX.; National Sanitation Foundation, Ann Arbor, MI.; Environmental Protection Agency, Washington, DC.
A hydrodynamic-settling device was installed in 2004 to treat stormwater runoff from a roof and parking lot located at the Water Utility Administration Building in Madison, Wis. The U.S. Geological Survey, in cooperation with the Wisconsin Department of Natural Resources, the City of Madison, cities in the Waukesha Permit Group, Hydro International, Earth Tech, Inc., National Sanitation Foundation International, and the U.S. Environmental Protection Agency, monitored the device from November 2005 through September 2006 to evaluate it as part of the U.S. Environmental Protection Agencys Environmental Technology Verification Program. Twenty-three runoff events monitored for flow volume and water quality at the devices inlet and outlet were used to calculate the percentage of pollutant reduction for the device.