Proceedings of the Symposium on Natural Attenuation of Chlorinated Organics in Ground WaterDIANE Publishing, 1996 |
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Page 20
... feet downgradient (Figure 2A) and indicating methanogenic conditions. Between 170 and 400 feet downgradient, concentrations of sulfate decrease and concentrations of H2S increase (Figure 2B), indicating active sulfate reduction ...
... feet downgradient (Figure 2A) and indicating methanogenic conditions. Between 170 and 400 feet downgradient, concentrations of sulfate decrease and concentrations of H2S increase (Figure 2B), indicating active sulfate reduction ...
Page 21
... feet downgradient, where concentrations of Fe2+ increase, H2 concentrations are in the 0.2 to 0.8 nM range characteristic of iron(III) reduction. A cross section showing the interpretation of these data and including wells screened ...
... feet downgradient, where concentrations of Fe2+ increase, H2 concentrations are in the 0.2 to 0.8 nM range characteristic of iron(III) reduction. A cross section showing the interpretation of these data and including wells screened ...
Page 25
... feet, the temperature in the subsurface is fairly consis- tent on an annual basis. Microcosms should be stored at the average in situ temperature. Biological growth can occur over a wide range of temperatures, although most ...
... feet, the temperature in the subsurface is fairly consis- tent on an annual basis. Microcosms should be stored at the average in situ temperature. Biological growth can occur over a wide range of temperatures, although most ...
Page 29
... feet = 6.4 years Segment B 80 feet = 2.4 years Segment C 200 feet = 10 years First-Order Rate Constants in Segments (per year) 0.54 TCE flow was 2.0 feet per year. With an estimated porosity in this particular glacial till of 0.1, this ...
... feet = 6.4 years Segment B 80 feet = 2.4 years Segment C 200 feet = 10 years First-Order Rate Constants in Segments (per year) 0.54 TCE flow was 2.0 feet per year. With an estimated porosity in this particular glacial till of 0.1, this ...
Page 59
... feet downgradient from the leading edge of the plume or the distance traveled by the ground water in 2 years , whichever is greater . If the property line is less than 500 feet downgradient , the point - of - compliance wells are placed ...
... feet downgradient from the leading edge of the plume or the distance traveled by the ground water in 2 years , whichever is greater . If the property line is less than 500 feet downgradient , the point - of - compliance wells are placed ...
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Common terms and phrases
aerobic Air Force Base anaerobic analysis aquifer assessment attenuation of chlorinated bacteria biodegradation biodegradation rate BIOSCREEN biotransformation BTEX characterization chemical chlorinated aliphatic hydrocarbons chlorinated ethenes chlorinated organics chlorinated solvents cis-DCE cleanup co-metabolic concentrations contaminant plume daughter products degradation dehalogenation determine DNAPL downgradient electron acceptors electron donor Environ estimated evaluated feet field Figure first-order fuel hydrocarbons geochemical ground water ground-water flow hydraulic conductivity hydrogen indicate intrinsic bioremediation intrinsic remediation iron(III J.T. Wilson Laboratory long-term monitoring mass metabolic methane methanogenesis methanogenic mg/L microbial Microbiol microcosm studies microorganisms natural attenuation nitrate occurring organic carbon oxidation parameters pathways Picatinny Arsenal potential present processes protocol pump-and-treat rate constants RBCA receptors redox reductive dechlorination regulatory sampling site-specific soil solvent plumes source area source removal substrate subsurface sulfate tetrachloroethene tion transect transformation transport trichloroethene U.S. Air Force U.S. Environmental Protection U.S. EPA U.S. Geological Survey vinyl chloride Wiedemeier zone µg/L
Popular passages
Page 141 - Bopp, MJ Brennan, ML Haberl, and C. Johnson. 1986. Rapid assay for screening and characterizing microorganisms for the ability to degrade polychlorinated biphenyls. Appl. Environ. Microbiol. 51:761-768.
Page 37 - natural attenuation as: The biodegradation, dispersion, dilution, sorption, volatilization, and/or chemical and biochemical stabilization of contaminants to effectively reduce contaminant toxicity, mobility, or volume to levels that are protective of human health and the ecosystem. In
Page 141 - van der Meer, JR, W. Roelofsen, G. Schraa, and AJB Zehnder. 1987. Degradation of low concentrations of dichlorobenzenes and 1,2,4-trichlorobenzene by Pseudomonas sp. strain P51 in nonsterile soil columns. FEMS Microbiol.
Page 112 - return usable ground waters to their beneficial uses within a timeframe that is reasonable given the particular circumstances of the site.
Page 56 - The chemical behavior of chloride is neutral. Chloride ions generally do not enter into oxidation-reduction reactions, form no important solute complexes with other ions unless the chloride concentration is extremely high, do not form salts of low solubility, are not significantly adsorbed on mineral surfaces, and play few vital biochemical roles
Page iii - (Resource Conservation and Recovery Act [RCRA] and Comprehensive Environmental Response, Compensation, and Liability Act
Page 58 - The long-term monitoring plan consists of locating ground-water monitoring wells and developing a ground-water sampling and analysis strategy. This plan is used to monitor plume migration over time and to verify that natural attenuation is occurring at rates sufficient to protect potential downgradient receptors.
Page 187 - Conservation and Recovery Act [RCRA] and Comprehensive Environmental Response, Compensation, and Liability Act
Page 91 - and M. Martin. 1991. Overview of research activities on the movement and fate of chlorinated solvents in ground water at Picatinny Arsenal, New Jersey. In: Morganwalp, DW, and DA Aronson, eds. US Geological Survey Toxic Substances Hydrology
Page 60 - Bouwer, EJ, and JP Wright. 1988. Transformations of trace halogenated aliphatics in anoxic biofilm columns. J. Contam. Hydrol. 2:155-169.