Remedial investigations

Sources of tliis information include site descriptions mid data from the preliminary assessment (PA), site inspection (SI), and remedial investigation (RI) reports. Other sources include local soil sur eys, wetland maps, aerial photographs, and reports by the National Oceanograpliic and Atmospheric Association (NOAA) and tlie U.S. Geological Sur ey (USGS). One cmi also consult with appropriate tecluiical e.xperts (e.g., hydrogeologists, air modelers) as needed to cluuacterize tlie site. 

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. 

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). 

Ebasco Services Incorporated. 1992. Remedial Investigation Summary Report, Final Version 3.2. 

Harding Lawson Associates. 1992. Offpost operable unit remedial investigation final addendum. Hardisty JF, Pellerin RJ, Biskup RK, et al. 1977. Reproductive studies with... 

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. 

Remedial investigation including site characterization and a treatability study... 

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. 

The hydrological characterization of the soil may have already been performed as a part of a preliminary remedial investigation, but much of the information has been developed with regard to defining the extent of the contamination and not with remedial solutions in mind, and not all of it may be suitable for your purposes. 

Regarding the requirements for remediation investigations and for the content of remediation plans (Article 13 (1)) to ensure that the Act and the Ordinances based on it are executed within the responsibility of the Federal Ministry of Defence and for the armed forces stationed in the Federal Republic of Germany as a result of agreements under international law by the Federal Ministry of Defence or of bodies chosen by this ministry. 

Evaluation, using trigger values and action values (Tables 9 to 17) Remediation investigation and planning... 

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. 

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. 

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. 

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 ... 

The USEPA established a National Remedy Review Board in 1995 to review all remedies. This board has saved an estimated 31 million, and future cost reductions of more than 725 million are expected (USEPA, 1998b). The remedial investigation (RI) will also include identification of "applicable or relevant and appropriate requirements" (ARARs). These are remediation standards, standards of control, or other criteria or limitations developed by federal or state law. Applicable requirements are those that have been previously used at a CERCLA site for the same waste. Relevant and appropriate requirements are those not formerly used for waste at a CERCLA site but which address the problem. Advisories and guidance to be considered can also be issued, but they are not as binding. 

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 ... 

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