Record Display for the EPA National Library Catalog
RECORD NUMBER: 40 OF 44
|OLS Field Name||OLS Field Data|
|Main Title||Superfund record of decision : Milltown Site, MT.|
|CORP Author||United States. Environmental Protection Agency.|
|Publisher||U.S. Environmental Protection Agency, Office of Emergency and Remedial Response ; Reproduced by National Technical Information Service,|
|Subjects||Hazardous waste sites--Montana.|
|Additional Subjects||Earth fills ; Industrial wastes ; Hazardous materials ; Waste disposal ; Site surveys ; Milltown site ; Sediments ; Sites ; Licenses ; Public health ; Water pollution ; Mine waters ; Water quality ; Potable water ; Arsenic ; Water supply ; Solid waste disposal ; Substitutes ; Water wells ; Cost analysis ; Capitalized costs ; Metals ; Montana ; Solid waste management ; Superfund program ; EPA Region 8 ; Municipal wastes ; Land reclamation ; Environmental research ; Remedial actions ; Liquid waste disposal ; Missoula County(Montana)|
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. In May, 1981, Milltown's four community water supply wells were found to be contaminated with arsenic and other heavy metals. The highest arsenic levels measured have been between 0.54 to 0.90 milligrams per liter (mg/l). The selected remedial alternative consists of: construction of a new well from a hydraulically separate aquifer; construction of a new distribution system; flushing the plumbing system of each house to remove suspended materials from the water system and plumbing and testing the water quality in each house to assure that the arsenic standard has been met. The capital cost for the selected alternative is estimated to be $262,714 and annual O&M costs are $4,238.
"04/14/84." "PB85-214070." "EPA/ROD/R08-84/001." "Office of Emergency and Remedial Response."