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An industrial metal
fabrication facility in southeast
Massachusetts, groundwater contaminated with perchloroethylene (PCE), trichloroethane
(TCE), and other industrial solvents.
- Groundwater at this facility
was contaminated by a
surface release of used degreasers. Both overburden and bedrock aquifers
were impacted. Assessment of the site indicated that the two are in hydraulic community.
- Eight years and over 5 million gallons of traditional pump
and treatment remediation had not reduced site contaminant concentrations
to the state drinking water standards.
- Contaminant
- Perchloroethylene (PCE), trichloroethane (TCE), and other
industrial solvents.
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Photo of an inoculation point |
- Contaminant
- Perchloroethylene (PCE), trichloroethane
(TCE), and other industrial solvents.
- Treatment Method - in-Situ
- Thirty-two (32) inoculation points were driven to the bedrock surface and set with 1/2
inch PVC well screen. The points were arranged in a grid pattern from upgradients of the
known extent of contamination to the property boundaries. The microbial products were
mixed with nutrients, biocatalyst, and injected into the points and the impacted
monitoring wells.
Groundwater samples were collected prior to injection of
the microbes and at 3 month intervals. The goal of the program
is to achieve PCE levels of 5 ug/L throughout the site. |
