Enhanced In Situ Bioremediation Process at the ITT Roanoke Site, Roanoke, VA (No Pub. Date)

Site Name:

ITT Roanoke Site


Roanoke, VA

Period of

March 1998 - July 1999


Field demonstration

In situ bioremediation
- Injection well delivers a mixture of air, nitrous oxide, triethyl phosphate, and methane at 15-30 psi and 20 scfm. The composition of the mixture was not specified.
- Groundwater and soil vapor monitoring wells were installed upgradient, down-gradient, and cross-gradient relative to the injection well location to delineate the zone of influence and monitor contaminant levels.

Cleanup Authority:

EPA Contact:
Mr. Vince Gallardo
Project Manager
National Risk Managment Research Laboratory (NRMRL)
26 West Martin Luther King Drive
Cincinnati, OH 45268
Phone: (513) 569-7176
Fax:: (513) 569-7620
E-mail: gallardo.vincente@epa.gov

Chlorinated and Non-Chlorinated Organic Compounds
- Chloroethane - 330 µg/L; 1,1 DCA - 960 µg/L; cis-1,2-DCE - 3,100 µg/L; vinyl chloride - 1,100 µg/L

Waste Source:
Manufacturing of equipment, leaking underground storage tanks containing chlorinated and non-chlorinated compounds used as cleaning solvents

Type/Quantity of Media Treated:

Purpose/Significance of Application:
Field demonstration of the enhanced in situ bioremediation process for chlorinated organics in groundwater in fractured bedrock

Regulatory Requirements/Cleanup Goals:
- 75% reduction (with a 0.1 level of significance) in the groundwater concentration of chloroethane, DCA, DCE, and vinyl chloride within 6 months within the zone of influence

- After 16 months of operation, treatment goals were achieved for cis-1,2-DCE and VC

Cost Factors:
- No information about costs was provided

The ITTNV plant in Roanoke, VA is an active manufacturing plant that produces night vision devices and related products. Groundwater contamination resulted from tank leaks of chlorinated and nonchlorinated compounds used as manufacturing cleaning solvents. The contaminated area included groundwater in fractured bedrock.

Of the four contaminants analyzed, two (cis-1,2-DCE and VC) met the treatment goal of 75% reduction (with a 0.1 level of significance) in the zone of influence. The demonstration was originally intended to last 6 months, but process optimization and modifications resulted in extending the evaluation period to 16 months.