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Author: Publisher: ISBN: Category : Languages : en Pages : 483
Book Description
This report presents the results of a remediation by natural attenuation treatability study (RNA TS) performed by Parsons Engineering Science, Inc. (Parsons ES) at Fire Training Area 2 (FTA-2), Tinker Air Force Base (AFB), Oklahoma. The RNA TS was performed to evaluate the use of natural attenuation with long-term monitoring (LTM) as a remedial option for dissolved chlorinated aliphatic hydrocarbon (CAM) contamination in the upper saturated zone (USZ). The presence of groundwater contamination and soil contamination at the site was documented during remedial investigations performed by International Technology Corporation (IT) (1994) and Tetra Tech (TT) (1996). This TS focused on the impact of dissolved CAHs, primarily trichloroethane (TCE), on the USZ groundwater system at, and downgradient from, the site. Site history and the results of soil and groundwater investigations conducted previously also are summarized in this report.
Author: Publisher: ISBN: Category : Languages : en Pages : 483
Book Description
This report presents the results of a remediation by natural attenuation treatability study (RNA TS) performed by Parsons Engineering Science, Inc. (Parsons ES) at Fire Training Area 2 (FTA-2), Tinker Air Force Base (AFB), Oklahoma. The RNA TS was performed to evaluate the use of natural attenuation with long-term monitoring (LTM) as a remedial option for dissolved chlorinated aliphatic hydrocarbon (CAM) contamination in the upper saturated zone (USZ). The presence of groundwater contamination and soil contamination at the site was documented during remedial investigations performed by International Technology Corporation (IT) (1994) and Tetra Tech (TT) (1996). This TS focused on the impact of dissolved CAHs, primarily trichloroethane (TCE), on the USZ groundwater system at, and downgradient from, the site. Site history and the results of soil and groundwater investigations conducted previously also are summarized in this report.
Author: Publisher: ISBN: Category : Languages : en Pages : 374
Book Description
This report presents the results of a treatability study (TS) performed by Parsons Engineering Science, Inc. (Parsons ES) at the Area A Service Station (Area A), Tinker Air Force Base (AFB), Oklahoma, to evaluate remediation by natural attenuation (RNA) of dissolved chlorinated aliphatic hydrocarbons (CAHs) and fuel hydrocarbons in groundwater. The TS focused on the fate and transport of dissolved CAHs, particularly trichloroethene (TCE), which are present at high concentrations. Petroleum hydrocarbons INCLUDING BENZENE, TOLUENE, ETHYLBENZENE, AND XYLENES (BTEX) are also present in site groundwater and were considered in this TS. The site history and results of previous soil and groundwater investigations are also summarized in this report.
Author: Publisher: ISBN: Category : Languages : en Pages : 451
Book Description
This report presents the results of a treatability study (TS) performed by Parsons Engineering Science, Inc. (Parsons ES) at CCFTA-2 (FT-17), Cape Canaveral Air Station, Florida to evaluate remediation by natural attenuation (RNA) of chlorinated aliphatic hydrocarbons (CAHs) dissolved in the site groundwater. The TS focused on the fate and transport of dissolved CAHs, particularly trichloroethene (TCE), dichloroethene (DCE), and vinyl chloride (VC); however, petroleum hydrocarbons INCLUDING BENZENE, TOLUENE, ETHYLBENZENE, AND XYLENES (BTEX) are present in site groundwater. Residual and mobile light nonaqueous-phase liquid (LNAPL) present in the vadose zone and phreatic soils serves as a continuing source for the dissolved CAHs and BTEX. Site history and the results of previous investigations are summarized in this report. The use of RNA has been evaluated with consideration to additional remedial actions at CCFTA-2 (FT-17), including source remediation via excavation and soil washing, and a horizontal air sparging system (HASS) that has been installed to reduce CAH concentrations in groundwater that discharges to surface water. Comparison of CAH, BTEX, electron acceptor, and biodegradation byproduct isopleth maps for CCFTA-2 (FT-17) provides strong qualitative evidence of biodegradation of dissolved CAHs. These geochemical data strongly suggest that reductive dehalogenation of dissolved CAHs is occurring at the site as microbes utilize natural organic carbon, BTEX, and other fuel hydrocarbons as substrates. Despite the presence of mobile LNAPL, BTEX concentrations in groundwater are low and will likely continue to drop as fuel compounds are consumed as substrates. Patterns observed in the distribution of CAHs, daughter products of CAHs, electron acceptors, and biodegradation byproducts further indicate that biodegradation is reducing the concentration of CAHs dissolved in site groundwater.
Author: Publisher: ISBN: Category : Languages : en Pages : 587
Book Description
This report presents the results of a treatability study (TS) performed by Parsons Engineering Science, Inc. (parsons ES) at Site LF-06, Columbus Air Force Base, Mississippi, to evaluate remediation by natural attenuation (RNA) of dissolved fuel- hydrocarbons and chlorinated aliphatic hydrocarbons (CAHs) in groundwater. The TS focused on the fate and transport of dissolved CAHs, particularly trichloroethene (TCE), chlorobenzene (CB), and vinyl chloride (VC); however, petroleum hydrocarbons INCLUDING BENZENE, TOLUENE, ETHYLBENZENE, AND XYLENES (BTEX) also are present in site groundwater and were considered. The site history and the results of the soil and groundwater investigations conducted previously also are summarized in this report.
Author: Publisher: ISBN: Category : Languages : en Pages : 328
Book Description
This work plan, prepared by Parsons Engineering Science, Inc. (Parsons ES), presents the scope of work required for the collection of data necessary to conduct a treatability study (TS) for groundwater contaminated with chlorinated aliphatic hydrocarbons (CAHs) and benzene, toluene, ethylbenzene, and xylenes (BTEX) at two sites located at Tinker Air Force Base (AFB), in Oklahoma City, Oklahoma (the Base). The two sites to be investigated are Fire Training Area 2 (FTA 2), and the former Base service station (Area A). Hydrogeologic and groundwater chemical data collected under this program can also be used to evaluate various engineered remedial options; however, this work plan is oriented toward the collection of hydrogeologic data to be used in support of remediation by natural attenuation (RNA) with long-term monitoring (LTM) for restoration of groundwater contaminated with CAHs and BTEX%.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This report presents the results of a treatability study performed by Parsons Engineering Science, Inc. (Parsons ES) at the FT-1 Site, Fairchild Air Force Base, Washington to evaluate remediation by natural attenuation (RNA) of dissolved fuel-hydrocarbons and chlorinated solvents in the shallow groundwater. RNA will supplement the engineered remedial actions prescribed in the Record of Decision (ROD). Residual nonaqueous-phase liquid (NAPL) present within the vadose zone and phreatic soils serves as a continuing source for the dissolved groundwater contamination. There is no evidence of mobile NAPL at this site. This study focused on the fate and transport of dissolved benzene, toluene, ethylbenzene, and xylene (BTEX) in the shallow groundwater system at the site. Dissolved chlorinated aliphatic hydrocarbons (CAHs) also are present in the shallow groundwater; therefore, the potential for RNA of these compounds was investigated as well. Site history and the results of soil and groundwater investigations conducted previously are also summarized in this report. Comparison of BTEX, CAH, electron acceptor, and biodegradation byproduct isopleth maps for Site FT-1 provides strong.
Author: Publisher: ISBN: Category : Languages : en Pages : 76
Book Description
This work plan, prepared by Parsons Engineering Science, Inc. (Parsons ES), formerly Engineering-Science, Inc. (ES), presents the scope of work required for the collection of data necessary to conduct a treatability study (TS) for remediation of groundwater contaminated with petroleum hydrocarbons at Building 1212 located at Fairchild Air Force Base (AFB), 12 miles west of Spokane, Washington (the Base). Hydrogeological and groundwater chemical data collected under this program can be used to evaluate various remedial options; however, this work plan is oriented toward the collection of hydrogeological data to be used as input into groundwater flow and solute transport models in support of remediation by natural attenuation (RNA) with long-term monitoring (LTM) for restoration of groundwater contaminated with benzene, toluene, ethylbenzene, and xylene (BTEX). As used in this report, RNA refers to a management strategy that relies on natural attenuation mechanisms to remediate contaminants dissolved in groundwater and to control receptor exposure risks associated with contaminants in the subsurface. The United States Environmental Protection Agency (US EPA) Office of Research and Development (ORD) and Office of Solid Waste and Emergency Response (OSWER) define natural attenuation as: The biodegradation, dispersion, 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. As suggested by this definition, mechanisms for natural attenuation of BTEX include advection, dispersion, dilution from recharge, sorption, volatilization, and biodegradation. Of these processes, biodegradation is the only mechanism working to transform contaminants into innocuous byproducts.
Author: Publisher: ISBN: Category : Languages : en Pages : 396
Book Description
This report presents the results of a treatability study (TS) conducted to evaluate the use of natural attenuation for remediation of chlorinated aliphatic hydrocarbon (CAM) - contaminated groundwater at Site LF-03, F. E. Warren AFB, Wyoming. The numerical models MODFLOW and MT3D were used in conjunction with site-specific geologic, hydrologic, and laboratory analytical data to simulate the migration and biodegradation of trichloroethene (TCE) dissolved in groundwater. It is likely that contaminants were first introduced into groundwater at this site shortly after the opening of LF-03 around 1960. Solvents, fuels, and other liquid wastes may have been spilled or dumped, or have leaked from containers in the landfill. Contaminants dissolved in leachate are assumed to have entered groundwater over relatively large areas (i.e., the landfill), through point sources due to spills or dumping, or through contact between groundwater and residual non-aqueous phase liquid (NAPL) at or below the water table. Contaminants observed in groundwater at LF-03 at concentrations greater than US Environmental Protection Agency (USEPA) maximum contaminant levels (MCLs) include TCE and cis-1,2-dichloroethene (cis-1,2-DCE). The dissolved CAM plume - appears to have migrated approximately 1,500 feet northeast from the source area at LF-03. Comparison of TCE plumes delineated in 1993 and 1999 indicate that the TCE plume is stable, although TCE concentrations have increased at several locations within the plume.
Author: Publisher: ISBN: Category : Languages : en Pages : 91
Book Description
This work plan, prepared by Parsons Engineering Science, Inc. (Parsons ES) formerly Science, Inc. (ES), presents the scope of work required for the collection of data necessary to conduct a treatability study (TS) for remediation of groundwater contaminated with petroleum hydrocarbons at Installation Restoration Program (IRP) Site SS-16 (a former military gasoline service station site), Langley Air Force Base (AFB) in Hampton, Virginia. Hydrogeologic and groundwater chemical data necessary to evaluate multiple remedial options will be collected under this program; however, this work plan is primarily oriented toward the collection of Hydrogeologic data to be used in support of intrinsic remediation (natural attenuation) for restoration of fuel-hydrocarbon- contaminated groundwater. Other remedial options will be considered in conjunction with intrinsic remediation during the TS, including free product removal; groundwater extraction and treatment (i.e., pump and treat); biosparging; bioslurping; and long-term monitoring.
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