[CPEO-BIF] McCook, Nebraska TRW plume reduction

[Lenny Siegel <lennysiegel@gmail.com>]

Company releases data showing reduction in contamination


Bruce Baker
McCook Gazette (NE)
March 22, 2011

McCOOK, Nebraska -- The Northrop Grumman Corp. provided further  
information to the Gazette this week that illustrated the history of  
the trichloroethylene plume, originating from the TRW facility site  
in McCook, by tracking its size since 1997 up to the most recent  
report done in 2010. After releasing a 2010 soil analysis and risk  
assessment report earlier this month, that stated the remediation  
system at the site has resulted in a significant reduction in the  
plume size and a decrease in overall TCE concentrations, the  
illustrations offer some easier to understand data about the site.

Northrop Grumman has been supplying the data to the Nebraska  
Department of Environmental Quality on an annual basis. Pumping to  
mitigate the contamination began in 1993 and had been ongoing for  
four years before the first report was sent to NDEQ in 1997. "The  
goal was not only to reduce it [TCE levels] but to halt the movement  
and spread of it," said Jeff Gwinn, local consultant for the project  
with Orion Environmental Inc., an environmental consulting company  
hired by Northrop Grumman.

Illustrations provided by Northrop Grumman show that in 1997 the  
plume was approximately 4,800 feet in length and varied from 300 to  
850 feet in width. It began at the former TRW facility location and  
spread southeast reaching past Kelley Creek. By 2001 the data showed  
that it had been broken into two separate plumes and began retracting  
from its previous southernly spread.

...

For the entire article, see
http://www.mccookgazette.com/story/1712434.html

--

Lenny Siegel
Executive Director, Center for Public Environmental Oversight
a project of the Pacific Studies Center
278-A Hope Street, Mountain View, CA 94041
Voice: 650-961-8918 or 650-969-1545
Fax: 650-961-8918
<lsiegel@cpeo.org>
http://www.cpeo.org

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