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Project Summary
Confidential Site, Orangeburg, South
Carolina |
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TERRY
completed the Corrective Action Plan (CAP) in September 2001 and
submitted it to the SCDHEC for review and approval. The CAP included
the use of multiple remedial technologies in a “treatment train” type
approach. The inclusion of multiple remedial technologies in a single
CAP significantly reduced the time required to switch between remedial
processes during the project, thereby increasing the overall
efficiency. |
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INITIAL EXCAVATION ACTIVITIES |
Implementation of the corrective action was approved by the SCDHEC in
November 2001. TERRY implemented the CAP by excavating 96 tons of
contaminated “source area” soil and remediating it off-site at a
thermal treatment/recycling facility. These initial activities
resulted in a decrease of contaminant mass on the order of approximately
10,000,000 parts per billion! |
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The excavation was filled and compacted
with clean material. Simultaneously, a permanent injection well was
installed in the source area to provide re-useable access to the
contaminant plume for the application of a proprietary mixture of
hydrocarbon degrading microorganisms and nutrients. Periodic injections of
the microorganism and nutrient solution were performed as needed between
2001 and 2004 to maintain a healthy microbial population and the desired
rate of contaminant destruction. |
LNAPL (PRODUCT) FLOATING ON WATER-TABLE |
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During this period, the store was
renovated and the UST system was replaced and/or upgraded. In February
of 2005 the remedial goals were achieved and the site entered the
verification process.
Two verification
wells were installed in June 2005 in locations chosen by the SCDHEC to
verify complete site remediation. Final closure of the site (including
the abandonment of all remedial equipment) was completed in September
2005. |
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to the effectiveness of combining multiple remediation technologies,
TERRY was able to reduce contaminant levels not only below the site
specific target levels for a risk based closure, but also below the US
EPA drinking water standards. This resulted in the SCDHEC issuing a “No
Further Action” letter for the site. Though the project took longer
than anticipated (for a number of reasons including a remodel of the
store and replacement of the entire UST system during the remediation
project) it was still completed within the original budget. |
