Superfund Information Systems: Site Profile

Superfund Site:

BASIN MINING AREA
BASIN, 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 TOWN OF BASIN Record of Decision
March 30, 2001
Disposal (offsite)
Excavation
Institutional Controls
No Action
Revegetation
02 BASIN WATERSHED Record of Decision
Data not available
03 LUTTRELL REPOSITORY No decision document
04 BUCKEYE/ENTERPRISE MINES No decision document
05 CRYSTAL MINE Record of Decision
April 24, 2015
Aeration Basin (P&T, exsitu)
Bioremediation (P&T, other, NOS, exsitu)
Cap (engineered cap)
Discharge (surface water/NPDES discharge)
Drainage/Erosion Control (other, NOS)
Excavation
Extraction (collection drain)
Institutional Controls
Monitoring (leachate)
Monitoring (surface water)
Neutralization (P&T, exsitu)
Precipitation (P&T, exsitu)
Repair (pipe/sewer/tank/structure repair)
Revegetation
Streambed/bank Rehabilitation
Wetland for Treatment (constructed engineered wetland)
06 BULLION MINE Record of Decision
April 24, 2015
Bioremediation (P&T, other, NOS, exsitu)
Clarification (sedimentation, P&T, exsitu)
Cover (soil)
Discharge (surface water/NPDES discharge)
Extraction (recovery trench/subsurface collection drain)
Institutional Controls
Monitoring (groundwater)
Monitoring (leachate)
Monitoring (surface water)
Neutralization (P&T, exsitu)
Revegetation
Soil Amendments
Vertical Engineered Barrier (other)

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