Superfund Information Systems: Site Profile

Superfund Site:

MILLTOWN RESERVOIR SEDIMENTS
MILLTOWN, MT

Operable Units

During cleanup, a site can be divided into a number of distinct areas depending on its complexity. These areas, called operable units (OUs), may address geographic areas, specific problems, or areas where a specific action is required. Examples of typical operable units include construction of a groundwater pump and treatment system or construction of a cap over a landfill.

OU ID Name Types of Contaminants
Present at the Time of
ROD Completion
Cleanup Technologies Selected
in the Decision Document
00 SITEWIDE
01 WATER SYSTEM
  • ARSENIC
  • METALS
  • Sampling
  • Water Supply (permanent replacement, other, NOS)
02 RESERVOIR
  • ARSENIC
  • CADMIUM
  • COPPER
  • LEAD
  • ZINC
  • Demolition
  • Dewatering
  • Disposal (offsite)
  • Excavation
  • Hydraulic Control (containment)
  • Institutional Controls
  • Monitored Natural Attenuation
  • Monitoring
  • Revegetation
03 MAINSTEM RIVER
  • ARSENIC
  • CADMIUM
  • COPPER
  • LEAD
  • ZINC

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