Phase 1 and 2 Feasibility Study Report for the 300-FF-1 Operable Unit
Phase 1 and 2 Feasibility Study Report for the 300-FF-1 Operable Unit

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Published: 2005

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The 300-FF-1 Operable Unit (OU) feasibility study (FS) presented in this document completes the FS process only through the first two study phases: Phase I, Remedial Alternatives Development, and Phase II, Remedial Alternatives Screening in accordance with CERCIA guidance for performing Remedial Investigations and Feasibility Studies (RI/FS) (EPA 1988a). This Phase I/II study provides a generalized view of workable remedial technologies as applied to the site contamination problems as a whole. Phase III, Detailed Analysis of Alternatives, will be performed at a later date to further evaluate screened alternatives based on the nine criteria in the CERCLA RI/FS guidance. The purpose of this Phase I/II FS is to develop and screen a range of alternatives for remediation of contamination present in the vadose zone of the 300-FF-1 OU. The scope of work for this Phase I/II FS includes five primary tasks: 1. Review existing documents and their associated data from relevant investigations and studies; 2. Establish remedial action objectives (RAO) and general response actions (GRA); 3. Identify applicable or relevant and appropriate requirements (ARARS) pertinent to all general response actions (including waste disposal); 4. Develop remedial alternatives (Phase I) applicable to the 300-FF-1 OU including identification and screening of technologies and process options, and assembly of remedial alternatives from representative technology types; 5. Screen alternatives (Phase II) developed in Phase I for implementability, effectiveness, and cost to identify those alternatives which warrant advancement to the detailed analysis phase (Phase III) of the FS.

Phase I and II Feasibility Study Report for the 300-FF-5 Operable Unit
Phase I and II Feasibility Study Report for the 300-FF-5 Operable Unit

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Published: 2005

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The purpose of this Phase I/II feasibility study is to assemble and screen a list of alternatives for remediation of the 300-FF-5 operable site on the Hanford Reservation. This screening is based on information gathered in the Phase I Remedial Investigation (RI) and on currently available information on remediation technologies. The alternatives remaining after screening provide a range of response actions for remediation. In addition, key data needs are identified for collection during a Phase II RI (if necessary). This Phase I/II FS represents a primary document as defined by the Tri-Party Agreement, but will be followed by a Phase III FS that will further develop the alternatives and provide a detailed evaluation of them. The following remedial action objectives were identified for the 300-FF-5 operable unit: Limit current human exposure to contaminated groundwater in the unit; Limit discharge of contaminated groundwater to the Columbia River; Reduce contaminant concentrations in groundwater below acceptable levels by the year 2018.

Remedial Investigation/Feasibility Study, Operable Unit 5, Elmendorf AFB, Anchorage, Alaska. Volume 1. Text
Remedial Investigation/Feasibility Study, Operable Unit 5, Elmendorf AFB, Anchorage, Alaska. Volume 1. Text

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Published: 1994

Total Pages: 715

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This Final Report for Operable Unit 5 (OU 5) is provided per the statement of work for the Remedial investigation/Feasibility Study for (RI/FS) OU 5. The RI portion of the report covers the site background, field investigations, nature and extent of contamination, conceptual model, and baseline risk assessment. The purpose of the RI is to define the contamination at OU 5 and the effects of the contamination on human health and the environment. The FS covers: (1) remedial action objectives, (2) an identification and screening of potentially applicable technologies, (3) a development and screening of alternatives which combine these technologies, and (4) a detailed analysis of the most applicable alternatives. The analysis considers the nine CERCLA evaluation criteria. The alternatives are evaluated according to their combined effectiveness, implementability, and cost scores. Based on the analysis, the most cost-effective alternatives are identified. Remedial action objectives, ARARs, Detailed analysis of alternatives, Operable Unit 5, Remedial investigation/feasibility study, Elmendorf AFB, Alaska.

Remedial Investigation/feasibility Study for the Clinch River/Poplar Creek Operable Unit. Volume 4. Appendix F.
Remedial Investigation/feasibility Study for the Clinch River/Poplar Creek Operable Unit. Volume 4. Appendix F.

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Published: 1995

Total Pages: 513

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This section contains ecotoxicological profiles for the COPECs for the combined Remedial Investigation/Feasibility Study Report for the Clinch River/Poplar Crack (CR/PC) Operable Unit (OU). The ecotoxicological information is presented for only those endpoints for which the chemicals are COPECs. The CR/PC OU is located in Anderson and Roane Counties, Tennessee and consists of the Clinch River and several of its embayments in Melton Hill and Watts Bar Reservoirs. These waters have received hazardous substances released over a period of 50 years from the US Department of Energy's Oak Ridge Reservation (ORR), a National Priority List site established under the Comprehensive Environmental Response, Compensation, and Liability Act. A remedial investigation has been conducted to determine the current nature and extent of any contamination and to assess the resulting risk to human health and the environment. The feasibility study evaluates remedial action alternatives to identify any that are feasible for implementation and that would effectively reduce risk. Historical studies had indicated that current problems would likely include 137Cs in sediment of the Clinch River, mercury in sediment and fish of Poplar Creek and PCBs and pesticides in fish from throughout the OU. Peak releases of mercury and 137Cs occurred over 35 years ago, and current releases are low. Past releases of PCBs from the ORR are poorly quantified, and current releases are difficult to quantify because levels are so low. The site characterization focused on contaminants in surface water, sediment, and biota. Contaminants in surface water were all found to be below Ambient Water Quality Criteria. Other findings included the following: elevated metals including cesium 137 and mercury in McCoy Branch sediments; PCBs and chlordane elevated in several fish species, presenting the only major human health risk, significant ecological risks in Poplar Creek but not in the Clinch River.

Remedial Investigation/Feasibility Study, Operable Unit 5, Elmendorf AFB, Anchorage, Alaska. Volume 2. Text and Appendices A - J.
Remedial Investigation/Feasibility Study, Operable Unit 5, Elmendorf AFB, Anchorage, Alaska. Volume 2. Text and Appendices A - J.

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Published: 1994

Total Pages: 671

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Remedial action alternatives were developed using the potentially acceptable technologies and representative process options identified in Section 9.0. The potential pathways that are addressed in this feasibility study (FS) are as follows: Groundwater; Seep discharges; Soil, and Sediment and surface water in the Snowmelt Pond. The goal of the FS is to evaluate multi-media alternatives (i.e., grouping of actions that, together, address the three pathways). Even with only a small number of actions that address each pathway, the number of combinations that would address multi-media impacts in different parts of the OU would be very large. Therefore, media-specific alternatives are screened in this section and evaluated in detail in Section 11.0. Multi-media alternatives are developed in the comparative analysis section of Section 11.0. Since the Snowmelt Pond has a presumptive remedy of constructed wetlands, the pond is discussed in detail in Section 11.0.