Final Site Information Package for National Remedy Review Board ...

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2. Site Regulatory History, Enforcement Activities, and Remedial Actions 2.1 Operable Unit Descriptions The Bunker Hill Superfund Site is located within northern Idaho, in sections of the Coeur d’Alene Reservation, and in northeastern Washington. The Site has three Operable Units (OUs)—OUs 1, 2, and 3. The 2001 NRRB Presentation Information (USEPA, 2001b; see Supplemental CD, File B2-1) 1 focused primarily on conditions in OU 3, which was the focus of the Remedial Investigation/Feasibility Study (RI/FS) for the Coeur d’Alene Basin completed in 2001 (USEPA, 2001c, 2001d). As noted in Part B, Section 1.1, the focus of the current 2010 NRRB Site Information Package is on the SFCDR portion of the Upper Basin of the Coeur d’Alene River, which includes OUs 1 and 2 and the Upper Basin portion of OU 3. Each OU is briefly described below. 2.1.1 Operable Unit 1 OU 1 is located within the rectangular 21-square-mile area surrounding the former smelter complex, commonly referred to as the Bunker Hill “Box”. The Box is located in a steep mountain valley in Shoshone County, Idaho, east of the city of Coeur d’Alene. Interstate 90 (I-90) bisects the Box and parallels the SFCDR. OU 1 is defined as the populated areas of the Bunker Hill Box because it is home to more than 7,000 residents of the towns of Pinehurst, Smelterville, Kellogg, and Wardner, as well as the unincorporated communities of Page, Ross Ranch, Elizabeth Park, and Montgomery Gulch. Residential neighborhoods and the former smelter complex are located on the valley floor. Residences also extend up side gulches and adjacent hillside areas. Populated areas of concern include residential yards, commercial properties, public use areas, and street rights of way. Cleanup activities at the Bunker Hill Superfund Site first began in OU 1 because of the risks posed to human health from exposure to mine and smelter wastes. Current land uses in OU 1 are primarily residential and commercial. Future land uses are expected to remain the same. 2.1.2 Operable Unit 2 OU 2 includes the non-populated, non-residential areas of the Bunker Hill Box. These nonpopulated areas include former industrial areas such as the Mine Operations Area (MOA) in Kellogg; Smelterville Flats (the floodplain of the SFCDR in the western half of OU 2); hillsides, creeks, and gulches; the Central Impoundment Area (CIA), an unlined closed impoundment of tailings, slag, and other wastes; the Central Treatment Plant (CTP), a water treatment facility for acid mine drainage (AMD) and other contaminated water flows from source areas; and the Bunker Hill Mine with its associated AMD. Current land uses in OU 2 are primarily non-residential, industrial, and open space. Future land uses are anticipated to 1 Additional discussion of the 2001 NRRB Presentation Information is provided on pages A-1 and A-2. B2-1
SITE INFORMATION PACKAGE FOR NATIONAL REMEDY REVIEW BOARD PART B, SECTION 2: SITE REGULATORY HISTORY, ENFORCEMENT ACTIVITIES, AND REMEDIAL ACTIONS also include recreational, residential (single and multi-family), commercial, and light industrial development. 2.1.3 Operable Unit 3 OU 3 consists of mining-contaminated areas in the Coeur d’Alene Basin outside OUs 1 and 2. These areas are primarily the floodplain and river corridor of the Coeur d’Alene River, Coeur d’Alene Lake, and the Spokane River, as well as those areas where mine wastes have come to be located as a result of their use for road building or for fill and construction of residential or commercial properties. The SFCDR within OU 2 and the non-populated areas of the Pine Creek drainage are both addressed as part of OU 3. Spillage from railroad operations has also contributed to contamination across OU 3. Since 2002, the focus of remedial activities in OU 3 has been implementation of the human health remedy selected in the ROD for OU 3 (USEPA, 2002), which is ongoing, and multiple prioritized actions to protect environmental receptors—for example, a project to create safe waterfowl feeding areas in the Lower Basin. Current land uses in OU 3 are a mix of residential, commercial, forestry, mining, agricultural, and open space. Future land uses are expected to remain the same. 2.2 CERCLA Investigations, Decision Documents, and Enforcement Summary Since the Bunker Hill Superfund Site was listed on the NPL, numerous technical reports and decision documents related to the three OUs have been prepared. Key documents include the following: • RI/FS for OU 1: − Residential Soil Feasibility Study for the Bunker Hill CERCLA Site Populated Areas Remedial Investigation/Feasibility Study (CH2M HILL, 1991) • ROD for OU 1: − Record of Decision, Bunker Hill Mining and Metallurgical Complex Residential Soils Operable Unit, Shoshone County, Idaho (USEPA, 1991a) • RI/FS for OU 2: − Bunker Hill Superfund Site Remedial Investigation Report, Volumes I, II, and III (McCulley, Frick, and Gilman, 1992a) − Bunker Hill Superfund Site Feasibility Study Report, Volumes I, II, III, and Associated Technical Memoranda (McCulley, Frick, and Gilman, 1992b) • ROD for OU 2: − Record of Decision, Bunker Hill Mining and Metallurgical Complex, Shoshone County, Idaho (USEPA, 1992) (Although not in the title, this ROD for OU 2 addressed the nonpopulated areas of the Bunker Hill Superfund Site, as well as those aspects of the populated areas that were not addressed in the 1991 ROD for OU 1.) B2-2
Page 1 and 2: United States Environmental Protect
Page 3 and 4: Contents Acronyms and Abbreviations
Page 5 and 6: SITE INFORMATION PACKAGE FOR NATION
Page 9 and 10: Acronyms and Abbreviations µg/dL m
Page 11 and 12: RAO remedial action objective RI/FS
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SITE INFORMATION PACKAGE FOR NATION
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12. Potential Applicable or Relevan
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COMMISSIONERS: PFfifiY WHITF CLERK
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Dan Opalski, U.S. EPA March 10,2010
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Dan Opalski, U.S. EPA March 10, 201
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Dan Opalski, U.S. EPA March 10,2010
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Rose Lake ll n e §¨¦ 90 DUDLEY "
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1992-1994 Removal of tailings and c
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The box plot shows the median or 50
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! ( ! ! ( ! ! ! Upper Basin Coeur d
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DUDLEY ") §¨¦ 90 ") St Joe River
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Base Map Data: NHDPlus (Rivers, Wat
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[Two Updated Updated Woodland Ecolo
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Ninemile Creek WALLACE BUNN Upper B
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OSBURN §¨¦ 90 Upper Basin Coeur
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176 E Upper Basin Coeur d'Alene Riv
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§¨¦ 90 ENAVILLE The Bunker Hill
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E 169 §¨¦ 90 Upper Basin Coeur d
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TABLE B2-1 Summary of Ongoing Data
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TABLE B4-2 Screening Level Exceedan
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TABLE B7-1 Preliminary Remediation
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TABLE B8-1 Descriptions of Typical
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TABLE B8-2 Summary of Alternatives
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TABLE B9-1a Comparative Analysis of
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TABLE B9-1b Comparative Analysis of
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TABLE B11-1 Legend of Bureau of Lan
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TABLE B11-1 Legend of Bureau of Lan
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TABLE B11-2 Summary of Estimated Po
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TABLE B11-4 Summary of Remedy Prote
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TABLE B14-1 Estimated Costs Summari
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TABLE B14-2 Summary of Estimated Co
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TABLE B14-2 Summary of Estimated Co
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