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Selection of Core Samples for Microcosm Studies of Natural Attenuation.

PB97192942

Publication Date	1997
Personal Author	Wilson, B. H.; Wilson, J. T.; Vardy, J. A.
Page Count	12
Abstract	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.
Keywords	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)
Source Agency	Environmental Protection Agency Office of Research and Development
Corporate Authors	National Risk Management Research Lab., Ada, OK. Subsurface Protection and Remediation Div.; Coast Guard, Elizabeth City, NC.
Supplemental Notes	Presented at the International Symposium on In situ and On-Site Bioremediation (4th). See also PB95-252995. Prepared in cooperation with Coast Guard, Elizabeth City, NC.
Document Type	Conference Proceedings
Title Note	Symposium paper.
NTIS Issue Number	199722

Selection of Core Samples for Microcosm Studies of Natural Attenuation.

Selection of Core Samples for Microcosm Studies of Natural Attenuation.
PB97192942

Publication Date	1997
Personal Author	Wilson, B. H.; Wilson, J. T.; Vardy, J. A.
Page Count	12
Abstract	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.
Keywords	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)
Source Agency	Environmental Protection Agency Office of Research and Development
Corporate Authors	National Risk Management Research Lab., Ada, OK. Subsurface Protection and Remediation Div.; Coast Guard, Elizabeth City, NC.
Supplemental Notes	Presented at the International Symposium on In situ and On-Site Bioremediation (4th). See also PB95-252995. Prepared in cooperation with Coast Guard, Elizabeth City, NC.
Document Type	Conference Proceedings
Title Note	Symposium paper.
NTIS Issue Number	199722