Superfund Explanation of Significant Difference for the Record of Decision (EPA Region 8): Silver Bow Creek/Butte Area, Silver Bow and Deer Lodge, MT, August 31, 1998

Technical Report · Tue Dec 01 04:00:00 EST 1998

OSTI ID:6481843

This document presents an Explanation of Significant Differences from the Record of Decision (ROD) for one Streamside Tailings Operable Unit (SSTOU) of the Silver Bow Creek/Butte Area National Priorities List (NPL) Site. The significant differences discussed in this ESD are: An increase in the volume of tailings/impacted soil in the operable unit; Modifications to the alignment of Silver Bow Creek and the channel profile (i.e., elevation profile); Use of a temporary stream diversion during and after construction to facilitate dewatering and excavation of near-stream tailings and to enhance floodplain and streambank revegetation efforts; Changes in the criteria for in-stream sediment removal as a result of other design changes; Modifications to the mine waste relocation repository (MWRR) design; The inclusion of sediment basins to contain contaminated overland flow run-on from off-site mine waste sources; Elimination of treatment wetlands as the end land use in Subarea 1; Changes in the estimated schedule to implement the SSTOU remedy; and An increase in the estimated cost of the SSTOU remedy.

• Research Organization: Environmental Protection Agency, Office of Emergency and Remedial Response, Washington, DC (United States)
• OSTI ID: 6481843
• Report Number(s): PB-98-963125/XAB; EPA--541-R98-116
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
540250* -- Environment
Terrestrial-- Site Resource & Use Studies-- (1990-)
540350 -- Environment
Aquatic-- Site Resource & Use Studies-- (1990-)
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