Innovative Technologies And Vadose Zone Treatment Of Chlorinated Volatile Organic Compounds - Case Study Page: 3 of 35
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Over the last 10 years a mix of innovative and conventional characterization techniques
has been used to assess the contamination of vadose zone sediments beneath the pilot-scale test
facility known as TNX at the Savannah River Site (SRS) in South Carolina. Shallow soils and
groundwater beneath the TNX facility are contaminated with chlorinated volatile organic
compounds (CVOCs), trichloroethylene (TCE), carbon tetrachloride (CC14), perchloroethylene
(PCE), and chloroform (CHCl3). An interim pump and treat remediation system was placed in
operation in 1996 to provide hydraulic containment of groundwater containing greater than
500 ug/L dissolved TCE.
In 1994, a vadose zone study was initiated to determine the degree and extent of CVOC
contamination above the contaminated groundwater. Headspace sampling and analysis,
acoustic infra-red spectroscopy, cone penetrometry, and vadose zone pumping tests were used
to determine contaminant concentrations and physical properties related to soil vapor
extraction. In 2001, soil vapor extraction (SVE), a presumptive remedy for CVOCs in soils
similar to those present beneath TNX, was selected to treat the CVOC contamination. Cone
Penetrometer Testing (CPT) with soil vapor sampling provided a detailed understanding of the
subsurface geology and CVOC distribution which was essential for proper well design and
placement. Twelve SVE wells were installed using direct push technology (DPT) and were
tested to determine specific capacity and CVOC concentrations. This information was then
used to develop a strategy for operating the SVE system. Based on the results of the baseline
testing and previous studies, sets of 2 to 3 extraction wells will be treated using SVE at one-
month intervals. This will allow continuous operation of the SVE system and give individual
wells up to 3 months for rebound between treatments. This method of operation is intended to
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NOONKESTER, JAY V.; NICHOLS, RALPH L. & DIXON, KENETH L. Innovative Technologies And Vadose Zone Treatment Of Chlorinated Volatile Organic Compounds - Case Study, article, August 2, 2005; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc875585/m1/3/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.