The U.S. Department of Energy (DOE) Office of Legacy Management (LM) is collaborating with Gunnison County, Colorado, to connect more domestic residences with private water wells within the groundwater contamination boundary at the former Gunnison uranium mill site to a municipal water supply.
“This is a major milestone that reflects LM’s mission of protecting human health and the environment,” said Jalena Dayvault, site manager for LM’s Gunnison, Colorado, Site. “Gunnison County Public Works Director, Marlene Crosby, worked diligently to get remaining domestic well users on-board so this project could move forward.”
The Gunnison site is a former uranium ore processing site located about a half-mile southwest of the city of Gunnison. The mill processed approximately 540,000 tons of uranium ore between 1958 and 1962, providing uranium for national defense programs. These ore processing activities resulted in contaminated groundwater beneath and near the site.
In 1994, a water treatment plant, storage tank, and distribution system were partially funded by DOE and installed to supply municipal drinking water to all residences within the contaminated groundwater boundary. This project was part of the remedial action plan at the former uranium mill site and is considered a protective measure in case the contaminated groundwater plume was ever to affect domestic well users within this boundary.
A small handful of homeowners with domestic wells in use before the cleanup continue to use those wells for drinking water. As part of LM’s long-term stewardship activities at the site, the office has monitored these wells annually to verify that mill-related contaminants have remained below U.S. Environmental Protection Agency (EPA) maximum concentration limits for the groundwater.
Working closely with Gunnison County Public Works, LM made funds available in September 2020 to support Gunnison County Public Works in connecting more residences with domestic wells to the municipal water supply. Excavation work began in November to connect the first residence to the alternate water supply.
“We started putting a game plan together back in early January of this year, reaching out to homeowners to get their buy-in and preparing a scope of work and budget for the project,” said Joe Lobato, site lead for the Legacy Management Support Partner (LMSP). “The LM and LMSP team has a great working relationship with Gunnison County.”