Vadose-Zone Monitoring, Sanitary Treatment Plant Sludge-Drying Beds, Rocky Flats Plant, Golden, Colorado

by James R. Kunkel, (M.ASCE), Advanced Sciences, Inc, Lakewood, United States,
J. Scott Thompson, Advanced Sciences, Inc, Lakewood, United States,

Document Type: Proceeding Paper

Part of: Water Policy and Management: Solving the Problems


The NPDES Federal Facilities Compliance Agreement (NPDES FFCA) of March 25, 1991 between the U. S. Department of Energy (DOE) and the U. S. Environmental Protection Agency (EPA), pursuant to Executive Order 12088, provides for compliance with water pollution control standards and appropriate operation of the Building 995 Sanitary Treatment Plant (STP) at the Rocky Flats Plant (RFP). Since 1952, digested sludge from the STP processes has been dried in seven covered and uncovered drying beds at the Building 995 STP. Because the beds were unlined, some water percolated into the unsaturated soil column beneath the beds. EPA requested that RFP characterize the soils beneath the sludge-drying beds and install and operate a vadose-zone monitoring system to assess the potential for contaminant movement. Statistical tests were used to assess if the concentrations of selected constituents in soil and soil water made these constituents potential contaminants of concern.

Subject Headings: Water treatment plants | Soil pollution | Water pollution | Soil water | Bed materials | Soil treatment | Sludge | Colorado | United States

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