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Record of Decision System (RODS)

ANACONDA CO. SMELTER

Abstract

Site Name:  ANACONDA CO. SMELTER
Address:  3 MI SE OF ANACONDA 
City & State:  ANACONDA  MT  59711
County:  DEER LODGE
 
EPA ID:  MTD093291656
EPA Region:  08
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R08-91/053
ROD Date:  09/23/1991
Operable Unit(s):  11
 
Media:  DEBRIS
 
Contaminant:  METALS, ARSENIC, CADMIUM, LEAD
 
Abstract:  THE 6,000-ACRE ANACONDA SMELTER SITE IS A FORMER COPPER AND ORE PROCESSING FACILITY IN DEER LODGE COUNTY, MONTANA. LAND USE IN THE AREA IS PREDOMINANTLY RESIDENTIAL. THE SITE IS BOUNDED ON THE NORTH AND EAST, RESPECTIVELY, BY THE WARM SPRINGS CREEK AND MILL CREEK, BOTH OF WHICH ARE POTENTIAL SOURCES OF DRINKING WATER. FROM 1884 UNTIL 1980 WHEN ACTIVITIES CEASED, THE SITE WAS USED FOR ORE PROCESSING AND SMELTING OPERATIONS. FLUE DUST WAS GENERATED AS A BY-PRODUCT OF COPPER SMELTING OPERATIONS. THE MAJORITY OF FLUE DUST THAT WAS GENERATED WAS REPROCESSED, AND THE REMAINING PORTION WAS STOCKPILED AT NINE LOCATIONS ON AND AROUND THE SITE. IN 1988, EPA CONDUCTED AN INVESTIGATION TO DETERMINE THE NATURE AND EXTENT OF THE FLUE DUST CONTAMINATION. A 1988 ROD ADDRESSED THE MILL CREEK OPERABLE UNIT (OU15) AND DOCUMENTED THE RELOCATION OF RESIDENTS FROM THE COMMUNITY SURROUNDING THE SMELTER SITE AS THE SELECTED REMEDIAL ACTION. THIS RECORD OF DECISION (ROD) ADDRESSES THE FLUE DUST OPERABLE UNIT (OU11). SUBSEQUENT RODS WILL ADDRESS FURTHER SITE CONTAMINATION IN ADJACENT SOIL, GROUND WATER, AND SURFACE WATER. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THIS SITE FROM THE FLUE DUST MATERIALS ARE METALS INCLUDING ARSENIC, CADMIUM, AND LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES EXCAVATING A TOTAL OF APPROXIMATELY 316,500 CUBIC YARDS OF FLUE DUST FROM THE NINE FLUE DUST LOCATIONS AND TREATING THE DUST ON-SITE USING CEMENT/SILICATE BASED STABILIZATION; DISPOSING OF THE TREATED RESIDUALS IN AN ON-SITE ENGINEERED REPOSITORY, WHICH WILL INCLUDE A SOIL OR CLAY LINER AND A LEACHATE COLLECTION SYSTEM; CONDUCTING AIR AND GROUND WATER MONITORING; AND IMPLEMENTING INSTITUTIONAL CONTROLS INCLUDING LAND USE RESTRICTIONS, AND SITE ACCESS RESTRICTIONS. THE ESTIMATED CAPITAL COST FOR THIS REMEDIAL ACTION IS $25,338,000, WITH AN ANNUAL O&M COST OF $10,000.

PERFORMANCE STANDARDS OR GOALS; THE TREATMENT LEVELS OF FLUE DUST CEMENT/SILICATE BASED STABILIZATION WILL RENDER THE MATERIAL NON-HAZARDOUS BY MEETING RCRA TCLP REGULATORY LIMITS, AND INCLUDE LEVELS THAT WILL LIMIT LEACHING OF CONTAMINANTS TO GROUND WATER TO ARSENIC 5.0 MG/L, CADMIUM 1.0 MG/L, AND LEAD 5.0 MG/L.
 
Remedy:  THE FLUE DUST OPERABLE UNIT IS THE SECOND REMEDIAL ACTION TO BE TAKEN AT THE ANACONDA SMELTER SITE. THE FIRST ACTION WAS TAKEN AT THE MILL CREEK OPERABLE UNIT WHICH INVOLVED THE RELOCATION OF RESIDENTS FROM THE COMMUNITY OF MILL CREEK. THE FLUE DUST OPERABLE UNIT ADDRESSES ONE OF THE PRINCIPAL THREAT WASTES (FLUE DUST) REMAINING ON THE ANACONDA SMELTER SITE. THIS ACTION ADDRESSES FLUE DUST AT THE NINE DISCRETE SOURCE AREAS ON THE ANACONDA SMELTER SITE THROUGH REMOVAL, TREATMENT AND CONTAINMENT. FUTURE OPERABLE UNITS WILL ADDRESS REMAINING WASTES ON THE SITE. REMEDIAL AND REMOVAL ACTIONS ON SEVERAL OF THESE FUTURE OPERABLE UNITS ARE ALREADY IN PROGRESS.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;
* REMOVAL AND TREATMENT VIA ON-SITE CEMENT/SILICATE BASED STABILIZATION OF APPROXIMATELY 316,500 CUBIC YARDS OF FLUE DUST MATERIAL LOCATED ON SMELTER HILL;
* DISPOSAL OF TREATMENT RESIDUES IN AN ON-SITE ENGINEERED REPOSITORY; AND
* LONG-TERM MONITORING AND INSTITUTIONAL CONTROLS INCLUDING SITE ACCESS CONTROL.
 
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