Superfund Information Systems: Site Profile

Superfund Site:

ANACONDA CO. SMELTER
ANACONDA, MT

Operable Units

Below, EPA has provided a list of the remedial actions selected pertaining to each operable unit.

EPA issues Records of Decision (RODs) to explain which cleanup methods will be used at Superfund National Priorities List sites. EPA has two primary documents that it may use to identify changes to the remedies selected in RODs. EPA uses a ROD Amendment when it needs to make a fundamental change to the remedy. EPA publishes an Explanation of Significant Differences (ESD) for significant changes.

During cleanup, complex sites may be divided into several distinct areas to make the response more efficient. These areas, called operable units (OUs), may address geographic areas, specific problems, or medium (e.g., groundwater, soil) where a specific action is required. The remedies are displayed for the OU numbers indicated in the original decision document. OU numbers may change over time.

EPA is working to improve data quality. The information presented on this page is undergoing review for accuracy and completeness, and may be subject to change.

OU ID Name Decision Document Cleanup Technologies Selected
in the Decision Document
00 SITEWIDE Not applicable
01 SITE WIDE No decision document
04 WATER, WASTE AND SOILS Record of Decision
September 29, 1998
Consolidate (onsite)
Cover (soil)
Drainage/Erosion Control (other, NOS)
Excavation
Hydraulic Control (containment)
Institutional Controls
Monitored Natural Attenuation
Monitoring (groundwater)
Monitoring (surface water)
Recycling (offsite)
Revegetation
Sampling
Shoreline Stabilization
Soil Amendments
Water Supply (permanent replacement, other, NOS)
Water Supply (temporary replacement, other, NOS)
04 WATER, WASTE AND SOILS Record of Decision Amendment
September 29, 2011
Consolidate (onsite)
Containment (other, NOS, onsite)
ESD/Amd - ARAR(s) Change
ESD/Amd - Significant Volume Change
Excavation
Monitoring
Sampling
04 WATER, WASTE AND SOILS Record of Decision Amendment
Data not available
07 OLD WORKS/EAST ANACONDA Record of Decision
March 08, 1994
Cap (engineered cap)
Consolidate (onsite)
Disposal (offsite)
Engineering Control (other, NOS)
Institutional Controls
Monitoring
Revegetation
07 OLD WORKS/EAST ANACONDA Explanation of Significant Differences
November 06, 1995
Cap (engineered cap)
Cover (soil)
Drainage/Erosion Control (other, NOS)
Monitoring
Revegetation
09 BERYLLIUM REMOVAL No decision document
11 FLUE DUST Record of Decision
September 23, 1991
Bottom Liner
Cap (engineered cap)
Excavation
Institutional Controls
Leachate Control
Monitoring
Residuals Treatment/Disposal (onsite)
Solidification/Stabilization (exsitu, onsite)
12 ARBITER REMOVAL No decision document
14 SMELTER HILL No decision document
15 MILL CREEK Record of Decision
October 02, 1987
Consolidate (onsite)
Demolition
Engineering Control (other, NOS)
Institutional Controls
Monitoring
Population Relocation (permanent)
Revegetation
15 MILL CREEK Record of Decision Amendment
January 06, 1988
ESD/Amd - ROD Error Correction
16 COMMUNITY SOILS Record of Decision
September 30, 1996
Bioremediation (aerobic, insitu)
Cap (engineered cap)
Containment (other, NOS, onsite)
Drainage/Erosion Control (other, NOS)
Engineering Control (other, NOS)
Excavation
Institutional Controls
Operations & Maintenance (O&M)
Revegetation
16 COMMUNITY SOILS Record of Decision Amendment
September 30, 2013
Cap (engineered cap)
Containment (other, NOS, onsite)
Decontamination
ESD/Amd - COC(s) Change
ESD/Amd - Cleanup/Performance Standard Change
ESD/Amd - ICs - Implement or Change
Excavation
Residential Topsoil Replacement
Revegetation
Sampling
Soil Amendments
16 COMMUNITY SOILS Explanation of Significant Differences
June 19, 2017
ESD/Amd - ICs - Implement or Change
ESD/Amd - Remedy Element Addition/Modification
ESD/Amd - Treatment Area Change

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