[CPEO-MEF] Innovative remedies at four Defense facilities

[Lenny Siegel <lsiegel@cpeo.org>]

The July 2006 issue ot Technology News and Trends, published by U.S. 
EPA's Technology Innovation Office, contains four articles about 
innovative remediation technologies being used at Department of Defense 
facilities. To download the entire newsletter, go to
http://www.epa.gov/tio/download/newsltrs/tnandt0706.pdf.

1. Biological PRB Application Expanded to Accelerate Perchlorate
Degradation in Ground Water.

The success of biological permeable reactive barriers (PRBs) in treating 
contaminated ground water at the Naval Weapons Industrial Reserve Plant 
in McGregor, TX, led to construction of a second PRB system comprising 
7,000 feet of treatment trenches in 2004-2005. [For more information on 
the initial PRB system, see the February 2004 Technology News and 
Trends.] Each PRB system targets one of three contaminated ground-water 
plumes migrating within separate drainage areas toward drinking-water 
reservoirs that serve 500,000 people in central Texas. The treatment 
systems are designed to reduce the mass of commingled contaminants in 
the source area, prevent contamination from exfiltrating to surface 
water, remediate shallow ground water on offsite property within 15 
years, and prevent further migration of contaminated ground water offsite.

...


2. Aquifer Monitoring Shows Complex-Sugar Flushing Increases Potential 
for Enhanced Biodegradation

Aquifer flushing was conducted on a site at the Naval Amphibious Base 
Little Creek (NABLC) in Virginia Beach, VA, in 2002 to remove dense 
non-aqueous phase liquid (DNAPL). The flushing system employed a 
solution containing cyclodextrin (CD) to increase solubility and removal 
efficiency of chlorinated solvents. The extracted CD solution was 
treated through air stripping and reused six months of the injections, 
preliminary results indicated a 50% removal of trichloroethene (TCE). 
[For details on this application, view the January 2003 .] More complete 
analysis of contaminant levels in the extracted solutions now confirms 
that cyclodextrin-enhanced flushing (CDEF) resulted in a 19-fold 
improvement in the volumetric rate at which chlorinated solvents could 
be extracted from a DNAPL-contaminated aquifer.

...


3. Combined Treatment Technologies for TCE Removal Approach Cleanup Closure

Use of soil vapor extraction (SVE) partially enhanced by electrical 
resistance heating (ERH) at the Air Force Plant 4 (AFP4) in Forth Worth, 
TX, over the past 13 years has resulted in successful removal of 
volatile and semivolatile contaminants in the site's vadose and 
saturated zones. Treatment of the contaminated soil and ground water 
posed unique challenges due to the presence of TCE in the vadose zone 
directly below the plant's "Building 181." In one of the building‘s 
monitoring wells, TCE concentrations were as high as 1,400 mg/L.

...

4. Pilot Tests Lead to Expanded ISCO for Vadose-Zone Remediation

Following successful pilot-scale field testing of in-situ chemical 
oxidation (ISCO) in 2001, the USAF began an expanded-scale application 
in 2003 to remove chlorinated solvents from an upgradient source area at 
Air Force Plant 44 in Tucson, AZ. [For information on site conditions 
and details concerning the pilot test, see the January 2003 issue of 
Technology News and Trends.] During both the pilot and expanded 
operations, potassium permanganate solutions were injected to remove 
residual high concentrations of TCE from fine-grained alluvial sediments 
in the upper part of regional aquifer.

...


--


Lenny Siegel
Director, Center for Public Environmental Oversight
c/o PSC, 278-A Hope St., 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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