Superfund Record of Decision (EPA Region 8): Milltown Reservoir Sediments, Milltown, Montana (Supplement to 04/14/84 Record of Decision), August 1985

摘要

The Milltown Reservoir Sediments site is located in Missoula County, Montana. The site is adjacent to the Milltown Dam where the Big Blackfoot River joins the Clark Fork River. Constructed in 1906, this hydroelectric dam formed a reservoir that trapped sediments from mining, milling and smelting operations in the upper Clark Fork valley. During the years since construction, the reservoir storage has been almost totally filled with arsenic contaminated sediments. The original ROD was signed in April 1984 approving the installation of an alternative water supply, and the flushing of the plumbing system of each house to remove suspended materials from the water system. This supplemental ROD approves the replacement of household water supply appurtenances and on-going sampling of residential water systems.