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• W347279927 abstract "In a cooperative conservation effort, the U.S. Department of Agriculture is cleaning up a contaminated aquifer in a rural community and simultaneously improving the community's recreational and educational opportunities. While one component of the cleanup system irrigates school athletic fields that were parched and bare in previous summers, other components have created a nearby public recreational area. The USDA's other partners in this effort are the U.S. Department of Energy's Argonne National Laboratory (ANL) and the U.S. Environmental Protection Agency, Kansas State University, state regulators, local businesses, governmental units, and residents. The groundwater aquifer beneath Murdock, Nebraska, became contaminated with carbon tetrachloride as the result of fumigation of grain stored decades ago in a USDA facility. Contaminant levels in the groundwater (up to 7,800 {micro}g/L at one time) precluded use of the aquifer for drinking water, and discharge of contaminated groundwater to a nearby creek posed health risks. Concentrations of carbon tetrachloride as high as 361 {micro}g/kg in subsurface soil indicated the presence of a soil source. Model simulations of potential leaching indicated that the source would continue to release contaminant for at least 80 years, and migration to the creek would continue after that. The USDA, ANL, and EPAmore » developed an innovative cleanup system that combines multiple technologies. Near the contamination source, pumps extract contaminated groundwater and pass it through a spray irrigation system that dissipates the carbon tetrachloride harmlessly into the air. The treated water irrigates the school's athletic field, nurturing a healthy grassy surface. Supplementing the spray irrigation technology are more than 2,000 trees planted downstream from where the groundwater enters the creek. The trees accomplish phytoremediation by taking up contaminated water and breaking down carbon tetrachloride naturally. Native prairie plants around and between the trees intercept rainwater and force the trees to draw most of their water from the aquifer. The partners are restoring a downstream wetland to intercept lingering traces of carbon tetrachloride and are installing an ADA-accessible, public trail through both the tree plantation and the wetland. Interpretive signs will enhance the visitor's experience and facilitate use of the site as an outdoor 'living' classroom for the local school district. The landowners have welcomed this public outreach aspect of the project. In addition, a visiting scientist program brings technical experts into the school to explain the cleanup effort and answer questions. The EPA has approved a monitoring plan to follow the progress of the cleanup effort and ensure the protection of human health and the environment.« less" @default.
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• W347279927 date "2006-01-01" @default.
• W347279927 modified "2023-09-26" @default.
• W347279927 title "Integrating phytoremediation, wetlands, spray irrigation, and prairie restoration to treat carbon tetrachloride contamination in a rural community." @default.
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