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Title: Final Environmental Assessment and Finding of No Significant Impact: Ground Water Compliance at the Slick Rock, Colorado, UMTRA Project Site

This environmental assessment addresses the environmental effects of a proposed action and the no action alternative to comply with U.S. Environmental Protection Agency (EPA) ground water standards at the Slick Rock, Colorado, Uranium Mill Tailings Remedial Action Project sites. The sites consist of two areas designated as the North Continent (NC) site and the Union Carbide (UC) site. In 1996, the U.S. Department of Energy (DOE) completed surface cleanup at both sites and encapsulated the tailings in a disposal cell 5 miles east of the original sites. Maximum concentration limits (MCLs) referred to in this environmental assessment are the standards established in Title 40 ''Code of Federal Regulations'' Part 192 (40 CFR 192) unless noted otherwise. Ground water contaminants of potential concern at the NC site are uranium and selenium. Uranium is more prevalent, and concentrations in the majority of alluvial wells at the NC site exceed the MCL of 0.044 milligram per liter (mg/L). Selenium contamination is less prevalent; samples from only one well had concentrations exceeding the MCL of 0.01 mg/L. To achieve compliance with Subpart B of 40 CFR 192 at the NC site, DOE is proposing the strategy of natural flushing in conjunction with institutional controlsmore » and continued monitoring. Ground water flow and transport modeling has predicted that concentrations of uranium and selenium in the alluvial aquifer will decrease to levels below their respective MCLs within 50 years.« less
Authors:
Publication Date:
OSTI Identifier:
823432
Report Number(s):
DOE/EA-1458
TRN: US0404088
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 13 Mar 2003
Research Org:
U.S. Department of Energy, Grand Junction Office (US)
Sponsoring Org:
USDOE Office of NEPA Policy and Assistance (EH-42) (US)
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; AQUIFERS; CARBIDES; COMPLIANCE; CONTAMINATION; ENVIRONMENTAL EFFECTS; FEED MATERIALS PLANTS; GROUND WATER; MONITORING; REGULATIONS; REMEDIAL ACTION; SELENIUM; SIMULATION; TAILINGS; URANIUM; URANIUM 228; US EPA EA; CO; UMTRA; SLICK ROCK; GROUNDWATER COMPLIANCE; FONSI; URANIUM