STUDY NUMBER : 4.4 



ORGANIZATION ; Montana Department of Health and Environmental 

 Sciences (MDHES) - Solid and Hazardous Waste Management 

 Bureau 



TITLE OF STUDY ; Milltown Superfund Site Studies 



CONTACTS ; Barbara Jones - Solid and Hazardous Waste Manage- 

 ment Bureau - MDHES - 444-2821 

 Jim Knoy - EPA Montana Office - 449-5414 

 Duane Robertson - SHWMB Bureau Chief - 444-2821 



OBJECTIVE ; Evaluate alternatives (and select a preferred 

 alternative) to rectify impacts to human health, the aquatic 

 environment and groundwater which have resulted from contam- 

 ination of reservoir sediments by arsenic and heavy metals. 



DURATION ; 1983 - 1986 



CURRENT STATUS ; In May, 1981, four community wells in 

 Milltown were tested by health officials and found to be 

 contaminated by arsenic. Subsequent studies by the Univer- 

 sity of Montana suggested that the contamination source was 

 heavy metal deposits within the reservoir's sediments. The 

 reservoir was designated as a Superfund site and a Remedial 

 Investigation (RI) was begun in July, 1983 to confirm the 

 source and extent of groundwater contamination. The RI was 

 completed in July, 1984: "Arsenic Source and Water Supply 

 Remedial Action Study, Milltown Reservoir." 



Concurrent with the RI, a Focused Feasibility Study was 



conducted to determine the most efficient way to provide safe 



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