Record Display for the EPA National Library Catalog


Main Title Selection of Core Samples for Microcosm Studies of Natural Attenuation.
Author Wilson, B. H. ; Wilson, J. T. ; Vardy, J. A. ;
CORP Author National Risk Management Research Lab., Ada, OK. Subsurface Protection and Remediation Div. ;Coast Guard, Elizabeth City, NC.
Publisher 1997
Year Published 1997
Report Number EPA/600/A-97/020;
Stock Number PB97-192942
Additional Subjects Microcosms ; Water pollution sampling ; Ground water ; Drill core analysis ; Industrial wastes ; Tetrachloroethylene ; Trichloroethylene ; Dichloroethylenes ; Vinyl chloride ; Petroleum products ; Hydrocarbons ; Aquifers ; Ecological concentration ; Environmental transport ; Water pollution control ; Biodegradation ; Biological activity ; Dissolved oxygen ; Oxidation reduction reactions ; Site surveys ; Site characterization ; Natural attenuation ; Bioremediation ; Chlorinated solvents ; Elizabeth City(North Carolina)
Library Call Number Additional Info Location Last
NTIS  PB97-192942 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 9p
The North Beach Site at the U.S. Coast Guard Support Facility in Elizabeth City, NC, served as location for incidental disposal of industrial wastes over a period of years. The primary contaminants discovered in the ground water are tetrachloroethylene (PCE) and its daughter products, trichloroethylene (TCE), cis-1,2-dichloroethylene (cis-1,2-DCE), and vinyl chloride (VC). To determine the potential for natural attentuation of the site contaminants, both field and laboratory investigations were undertaken. Cores were obtained at the North Beach location for use in batch microcosm studies. Laboratory rate constants obtained from the microcosm studies will be compared to those obtained from the field investigation. Prior to selection of core material, the location of the interval of highest ground-water flow and geochemical characteristics indicative of biological activity were determined on water sampled with a geoprobe. As part of the investigation, field measurements for geochemical indicators of biological activity were evaluated for their ability to identify contaminated ground water. The identification of ground waters impacted by contamination with petroleum hydrocarbons and chlorinated solvent has been well documented by a low redox potential, no dissolved oxygen, the presence of ferrous iron, and increased alkalinity compared to other ground waters at the site. Contamination is frequently found in the interval with the highest hydraulic conductivity. The selection of core samples for microcosm studies was based primarily on the vertical distribution of PCE and its reduction daughter products and on the vertical extent of hydraulic conductivity.