The Army Corps of Engineers will apparently “do the right thing” when it comes to taking responsibility for treating one source of Cheyenne’s drinking water for trichloroethylene, or TCE, which is a result of Cold War-era nuclear missile maintenance east of Cheyenne.

Paul Johnston, public affairs officer for the Omaha district of the Army Corps of Engineers, said the Corps is charged by the Department of Defense to administer the FUDS (formerly used defense sites) program.

That means taking care of a range of sites, “from missile sites to old training grounds to WWI and WWII bombing ranges and old munitions storage; the whole gamut,” Johnston said.

But right now, the city is paying the $20,000 a year it takes to remove the TCE from the water before it arrives at residents’ taps.

It also paid $600,000 for the aeration basin that removes the chemical when it was first found in 1998, Jane Francis, geological supervisor at the Wyoming Department of Environmental Quality, said.

“Our first priority is safe drinking water,” Bud Spillman, manager of the water treatment division of the Cheyenne Board of Public Utilities, said in a news release. “We can remove the TCE at the treatment plant and do not allow any water contaminated with TCE to be piped to town.”

But before the water from the newly-acquired Belvoir Ranch can be sent to Cheyenne, the aeration basin at the treatment plant will need to be increased, according to a BOPU news release.

“The cost to increase capacity at the aeration basin is a cost that Cheyenne’s residents shouldn’t have to pay,” Spillman said in the release.

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The Army Corps has been studying the contamination in Cheyenne for the last seven years, Francis said.

They’re making slow progress in trying to find out how long the contamination plume is, she added. It is the position of the department that there is one large plume of TCE that is a result of the chemical being used at the Atlas No. 4 missile site.

Johnston said there are two areas of contamination. One is obviously because of the work at the missile site.

The Army Corps is taking full responsibility for that site, he said, and taking steps to clean it up.

But there is a 2- to 3-mile stretch where there is no contamination, and the TCE picks up again about 10 miles from the missile site. The source of the contamination at that site isn’t clear to the Army Corps, Johnston said.

Working with the Environmental Protection Agency and BOPU, “all of us cannot find a firm link between the two contaminated areas,” he said.

That’s as of yet, anyway. In June, Johnston said the Army Corps plans to have more people out in the field doing studies to determine the source of contamination for the second plume.

If it is found that the water is also contaminated because of the missile maintenance, the Army Corps will take full responsibility and clean it up, he said.

With about 60 percent of Dutchess County residents getting their water supply from groundwater — interest in keeping it clean and abundant, especially with increased pollution, is important to many residents.

On Oct. 29, the Groundwater 2005 Conference will be held at Vassar College in Poughkeepsie from 8:30 a.m. to 4:30 p.m.

Eleven geologists, environmental consultants, hazardous waste engineers, research scientists, state officials and other speakers will present information. The conference is intended for the public, politicians, developers and members of planning and zoning boards.

· 85% of the sites below were discovered 15 yrs ago or more
· over 60% of the potentially eligible sites and over 35% of all sites below report no clean-up activities

The purpose of this document is to provide a synopsis of trichloroethylene (TCE) inhalation toxicity values and provide the corresponding risk-based indoor air concentrations for use in vapor intrusion assessment. Table 1 summarizes the toxicity values and risk-based concentrations. Figure 1 provides a graphic comparison of the ranges of concentrations corresponding to each of the toxicity values.