Remedial investigation/feasibility study

No specific information was found on the releases of diisopropyl methylphosphonate to soil. However, diisopropyl methylphosphonate has been detected in soils at the RMA (Williams et al. 1989). Concentrations of diisopropyl methylphosphonate in live surface soil samples at the RMA ranged from <0.05 to 0.24 mg/kg (Williams et al. 1989). Concentrations of diisopropyl methylphosphonate in surface soil samples measured during the Remedial Investigation/Feasibility Study (RI/FS) at RMA ranged from less than the analytical limit of 0.114 mg/kg to 11 mg/kg (Ebasco Services 1991). The most recent sampling conducted in 1995 indicated the concentrations of diisopropyl methylphosphonate in the onpost surface soil samples were less than the analytical reporting limit of 0.342 mg/kg (D.P. Associates 1995). 

If it deems it necessary, the USEPA can require an expedited response action (ERA) at a site that would require an immediate engineering evaluation/ cost analysis (EE/CA). After a removal action is completed or determined unnecessary, the long-term remedial action must be undertaken. First, a remedial investigation/feasibility study (RI/FS) is performed to determine a proper course of action. This can involve ... 

No long-term research studies on the environmental fate of silver were identified. However, environmental monitoring being conducted in conjunction with remedial investigation/feasibility studies at NPL sites where silver has been found should add useful information regarding environmental concentrations, chemical species, fate, and transport of the compounds. 

Environmental Fate. Information on biodegradation in soil under aerobic conditions exists, but degradation products were not identified. Anaerobic biodegradation, as might occur in river bottoms and in Superfund sites, has not been studied and would be valuable. Emissions from waste lagoons have been modelled and measured in bench-top experiments and are measured as part of many Superfund Remedial Investigation/Feasibility studies, but those were not located. 

Long-term research studies on the environmental fate of 1,1-dichloroethane have not been identified. The data generated as a result of the remedial investigation/feasibility studies of the 189 sites on the National Priority List (NPL) known to be contaminated with 1,1-dichloroethane should add to the current knowledge regarding the environmental transport and fate of the compound. 

Remedial investigation/feasibility studies being conducted at the 46 NPL sites where creosote has been found and at the numerous creosote-contaminated Resource Conservation and Recovery Act (RCRA) corrective action sites should provide data on concentrations of the mixture in contaminated media in the vicinity of hazardous waste sites. For example, creosote constituents have been found in surface water impoundments and soil samples taken near wood treatment facility sites in Colorado, Louisiana, Texas, and Montana. 

Based on available information, including a Remedial Investigation / Feasibility Study (RI/FS), the American Creosote Works site in Pensacola, Florida was selected for the investigation. The site was included on the National Priorities List on the basis of the RI/FS study which suggested that the groundwater imder the site was heavily contaminated with both PAHs and PCP. 

Smuin D, Crutcher J. 1991. Applicability of environmental laws to the remedial investigation and cleanup of a site at Naval Air Station Fallon, Nevada. Hazrap Navy remedial action investigation feasibility study. Oak Ridge National Laboratory TN. 

Ongoing remedial investigations and feasibility studies conducted at the NPL sites known to be contaminated with methyl parathion will add to the available database on exposure levels in environmental media, exposure levels in humans, and exposure registries. 

A number of site-specific factors must first be evaluated. Including (1) the chemical characteristics and amount of hazardous waste, (2) the potential for release to the environment, (3) the sensitivity of the particular environment to the hazardous waste, (4) the proximity of the hazardous waste to humans, and (5) Its potential effect on human health. Then the environmental engineer must decide If a field Investigation of the site Is necessary, whether a feasibility study for remedial action Is required, what remedial action Is required to mitigate. If not eliminate, the contamination, and finally, what monitoring plan will enable the efficacy of the remedial action to be evaluated. 

This chapter presents a regulatory overview of on-site remediation, remedial investigations (RI), feasibility studies (FS), remedial technologies, and a simulated case study. The discussion of remedial investigations and feasibility studies also includes the development and selection of remedial technologies. The case study outlines a remedial investigation and feasibility study, as well as the selection of remedial technologies. 

Source From U.S. EPA, Guidance for Conducting Remedial Investigations and Feasibility Studies under CERCLA, EPA/540/G-89/004, October, U.S. EPA, Washington, DC, 1988. 

QA, quality assurance RI, remedial investigation FS, feasibility study SAP, sampling and analysis plan FSP, field sampling plan QAPP, quality assurance project plan OSHA, Occupational Safety and Health Administration. 

No information was located on any on-going studies on the fate and transport of bromomethane. However, two studies related to human exposure to bromomethane are being supported by the U.S. Department of Agriculture and conducted at the University of California, Davis. One project will analyze bromomethane residues on foods, and the second will quantitate exposure levels of field workers to bromomethane and develop appropriate procedures to minimize exposure from this source. Remedial investigations and feasibility studies at NPL sites that contain bromomethane will provide further information on environmental concentrations and human exposure levels near waste sites. 

Remedial investigations and feasibility studies at NPL sites that contain chloroform will also provide further information on environmental concentrations and human exposure levels near waste sites. 

Remedial investigations and feasibility studies at hazardous waste sites are potential sources of information on possible exposures of populations surrounding hazardous waste sites. 

No information was located on any on-going studies on the fate, transport, or potential for human exposure to 2,3-benzofuran. Remedial investigations and feasibility studies at hazardous waste sites may provide information on environmental levels, transport, and transformation of 2,3-benzofuran. 

A feasibility study is necessary after the remedial investigation to make sure the proper remedial action has been selected. Once that has been completed, the USEPA publishes a Superfund Record of Decision (ROD), which describes the remedial action selected. The next step is the remedial design/ remedial action phase, which can include ... 

Remedial investigations and feasibility studies conducted at the 154 NPL sites known to be contaminated with barium will add to the available database on exposure levels in environmental media, exposure levels in humans, and exposure registries and will increase the current knowledge regarding the transport and transformation of barium in the environment. No other long-term research studies pertaining to the environmental fate of barium or to occupational or general population exposure to barium were identified. 

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