An Interstate Technology and Regulatory Council (ITRC) forum was recently held that focused on six case studies in which bioremediation of dense nonaqueous-phase liquids (DNAPLs) was performed;the objective was to demonstrate that there is credible evidence for bioremediation as a viable environmental remediation technology. The first two case studies from the forum have been previously published; this third case study involves a pilot-scale demonstration that investigated the effects of biological activity on enhancing dissolution of an emplaced tetrachloroethene (PCE) DNAPL source. It used a controlled-release test cell with PCE as the primary DNAPL in a porous media groundwater system. Both laboratory tests and a field-scale pilot test demonstrated that bioaugmentation can stimulate complete dechlorination to a nontoxic end product and that the mass flux from a source zone increases when biological dehalorespiration activity is enhanced through nutrient (electron donor) addition and bioaugmentation. All project goals were met. Important achievements include demonstrating the ability to degrade a PCE DNAPL source to ethene and obtaining significant information on the impacts to the microbial populations and corresponding isotope enrichments during biodegradation of a source area. O
The GORE Module is a passive sampler that was developed to sample air and water for a variety of volatile and semi-volatile organic compounds (VOCs and SVOCs). Recently, Amplified Geochemical Imaging (AGI) LLC (Elkton, MD) has acquired this technology, and the sampler is now known as the AGI Universal Sampler. The objectives of this project were to determine, when sampling groundwater, if the GORE Modules can provide (1) technically defensible analytical data for VOCs and SVOCs and (2) substantial cost savings when compared with the US Environmental Protection Agency's (US EPA) low-flow purging and sampling method. Sampling was conducted at two sites: the Southern Bush River section of Aberdeen Proving Ground (APG), MD, and the former Pease Air Force Base in Portsmouth, NH. Analytes included chlorinated VOCs and hydrocarbon VOCs and SVOCs. Additional Modules placed in some wells allowed us to examine concentration gradients in those wells with depth both before and after low-flow sampling. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.
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