Final Feasibility Study for Explosive Washout Plant - Building 489 (OU6) at the Umatilla Depot Activity (UMDA)
Abstract
This feasibility study (FS) for the Explosive Washout Plant (also designated as Building 489 or Site 5) Operable Unit at the U.S. Army Depot Activity at Umatilla (UMDA) has been prepared to evaluate potential remedial alternatives for mitigating explosive contamination at this site. It was conducted in accordance with the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) as amended by the Superfund Amendments and Reauthorization Act of 1986 (SARA). This FS provides a summary of the remedial investigation and risk assessment information developed by USAEC/Dames & Moore, remedial action objectives, identification and screening of potential remediation technologies, and a detailed evaluation of alternatives assembled from the most promising technologies. The alternatives evaluated in detail are No Action, Sump Cleanout and Controlled Access, Hydroblasting, Hot Gas Decontamination and Demolition and Disposal. Each of the alternatives (except No Action and Sump Cleanout/Controlled Access) also include pretreatment steps (such as solvent flushing of process equipment and solvent wiping metal surfaces) and post treatment by demolition/disposal. The alternatives were evaluated for overall protection of human health and the environment; compliance. with applicable or relevant and appropriate requirements (ARARs); long-term effectiveness; reduction of toxicity, mobility, and volume; short-term effectiveness; implementability; and cost. The No Action alternative failed to provide overall protection of human health and the environment and did not meet ARARs. With the exception of the No Action alternative, all the alternatives meet requirements for overall protection of human health and the environment, compliance with ARARs, short-term effectiveness and implementability. Of all the alternatives, the least costly (controlled access) provided adequate effectiveness and reduction in toxicity, mobility or volume.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 15, 1993
- Accession Number
- ADA427129
Entities
People
- Armand A. Balasco
- Lawrence R. Woodland
- Richard C. Bowen
Organizations
- Arthur D. Little