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Silver Bow Creek/Butte Area Superfund Site

Submissions from 2025 2025

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Butte Reclamation Evaluation System (BRES) Draft 2024 Corrective Action Plans (dated January 27, 2025), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final 2022 Unreclaimed Sites Sampling: UR-06 Site Evaluation Summary Report (dated April 1, 2025), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final 2022 Unreclaimed Sites Sampling: UR-12 Site Evaluation Summary Report (dated April 8, 2025), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final 2025 Residential Metals Abatement Program (RMAP) Valley Sand & Gravel (Builders FirstSource) Borrow Submittal #1 (dated June 27, 2025), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Residential Metals Abatement Program (RMAP) Quality Assurance Project Plan (QAPP) (Non-Residential Parcels and Residential Daycares) (dated February 26, 2025), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Residential Metals Abatement Program (RMAP) Quality Assurance Project Plan (QAPP) (Residential Parcels) (dated February 26, 2025), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Unreclaimed (UR) Sites UR-13 Site Evaluation Summary Report (SESR) (November 1, 2024), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Insufficiently Reclaimed Sites BRES No. 158 – Waste Rock Dump Remedial Action Work Plan (RAWP) (dated March 28, 2025), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Insufficiently Reclaimed Sites Josephine Shaft (IR-37) Remedial Action Work Plan (RAWP) (dated February 6, 2025), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Unreclaimed Sites UR-22 Site Evaluation Summary Report (dated April 2, 2025), Molly Roby

Re: Comment letter for the Draft Final Butte Priority Soils Operable Unit (BPSOU) 2022 Unreclaimed Sites Sampling: UR-20 Site Evaluation Summary Report (dated March 19, 2025), Molly Roby

Re: Comment letter for the Draft Final Butte Priority Soils Operable Unit Unreclaimed Sites New and Mahoney (UR-23) Construction Completion Report., Molly Roby

Re: Conditional approval letter for the Butte Priority Soils Operable Unit (BPSOU) 2025 Revised Draft Final Unreclaimed Sites Quality Assurance Project Plan (QAPP) (dated May 15, 2025), Molly Roby

Re: Conditional approval letter for the Butte Priority Soils Operable Unit (BPSOU) 2025 Revised Draft Final Unreclaimed Sites Quality Assurance Project Plan (QAPP) (dated May 15, 2025), Molly Roby

Re: Acknowledgement Letter for the Final Blacktail Creek Groundwater Hydraulic Control System Pre-Design Investigation Evaluation Report (dated February 27, 2025), Emma Rott

Re: Approval Letter for BPSOU Blacktail Creek Riparian Actions Draft Field Work Plan: Wetlands Delineation and Functional Assessment (received August 8, 2025), Emma Rott

Re: Approval Letter for BPSOU Blacktail Creek Riparian Actions Revised Draft Final Uniform Federal Policy Quality Assurance Project Plan (dated September 30, 2025), Emma Rott

Re: Approval Letter for Butte Priority Soils Operable Unit (BPSOU) Draft Final 2024 Subdrain Data Summary Report (dated April 30, 2025), Emma Rott

Re: Approval Letter for Butte Priority Soils Operable Unit (BPSOU) Superfund Operation and Maintenance (O&M) Request for Maintenance – Kelley Stormwater Channels (revised on July 23, 2025), Emma Rott

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Butte Treatment Lagoons (BTL) Groundwater Treatment System Quarterly Operation and Maintenance Report – Quarter 1 2025 (dated June 30, 2025), Emma Rott

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Butte Treatment Lagoons (BTL) Groundwater Treatment System Quarterly Operation and Maintenance Report – Quarter 4 2024 (dated March 28, 2025), Emma Rott

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Butte Treatment Lagoons (BTL) Groundwater Treatment System Routine Operations, Maintenance, and Monitoring (OM&M) Plan (dated August 29, 2025), Emma Rott

Re: Approval Letter for the Butte Priority Soils Operable Unit Clark Tailings Consolidated Waste Management Area 2019-2023 Data Summary Report and Response to EPA Comments (dated September 24, 2025), Emma Rott

Re: Approval Letter for the Draft Final Butte Reduction Works (BRW) Air Monitoring for Interim Demolition Activities – Phase I Data Summary Report (dated March 21, 2025), Emma Rott

Re: Approval Letter for the Draft Final Butte Reduction Works (BRW) Smelter Area Mine Waste Remediation and Contaminated Groundwater Hydraulic Control Site Phase III Quality Assurance Project Plan (QAPP) (dated February 27, 2025), Emma Rott

Re: Approval Letter for the Draft Final Butte Reduction Works (BRW) Smelter Area Mine Waste Remediation and Contaminated Groundwater Hydraulic Control Site Quality Assurance Project Plan (QAPP) for Microbial Analysis and Biotreatability Study (dated February 27, 2025), Emma Rott

Re: Approval letter for the Final Butte Priority Soils Operable Unit (BPSOU) Butte Treatment Lagoons (BTL) Groundwater Treatment System Quarterly Operation and Maintenance Report – Quarter 1 2024 (dated August 14, 2025), Emma Rott

Re: Approval letter for the Final Butte Priority Soils Operable Unit (BPSOU) Butte Treatment Lagoons (BTL) Groundwater Treatment System Quarterly Operation and Maintenance Report – Quarter 2 2024 (dated August 19, 2025), Emma Rott

Re: Approval letter for the Final Silver Bow Creek Conservation Area Repository Data Gap Data Summary Report (dated April 4, 2025), Emma Rott

Re: Approval letter with comments for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Annual Operations and Maintenance (O&M) Butte Treatment Lagoons (BTL) System 2024 (dated May 30, 2025), Emma Rott

Re: Comment Letter for BPSOU Blacktail Creek Riparian Actions Revised Draft Final Uniform Federal Policy Quality Assurance Project Plan (dated July 31, 2025), Emma Rott

Re: Comment Letter for BPSOU Draft Final Phase I Design Investigation Evaluation Report and Response to Comments, Blacktail Creek Riparian Actions (dated January 24, 2025), Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit Berkeley Pit Geochemical and Limnological Evaluation Pre-Design Investigation (PDI) Work Plan (dated December 17, 2024), Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Draft 2024 Groundwater Monitoring Data Summary Report (dated May 30, 2025), Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Draft 2024 Site-Wide Surface Water Monitoring Data Summary Report (dated May 30, 2025), Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU), Draft Preliminary (30%) Remedial Design Report, Blacktail Creek Riparian Actions (dated July 28, 2025), Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Notice of Intent to Abandon BPS07-05A and BPS07-05B (dated July 14, 2025), Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Principles for a Greener Cleanup Report (dated December 23, 2024), Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Superfund Operation and Maintenance (O&M) Request for Maintenance – Kelley Stormwater Channels (dated April 22, 2025), Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit Draft Final Leak Infiltration Evaluation (dated July 24, 2025), Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit Subdrain Pump Station 30% Remedial Design Package Submittal (dated January 31, 2025), Emma Rott

Re: Comment Letter for Clark Tailings Consolidated Waste Management Area (CTCWMA) Site Investigation Quality Assurance Project Plan Revision 01 (dated June 6, 2025), Emma Rott

Re: Comment Letter for Diggings East 95 % Remedial Design Package Submittal (dated August 29, 2025), the Silver Bow Creek Conservation Area (SBCCA) – 95 Percent Programmatic Technical Specifications Submittal (dated August 19, 2025), the Draft Final SBCCA Construction Quality Assurance Plan (dated August 20, 2025) and the Butte Priority Soils SBCCA Operations and Maintenance (O&M) Plan (dated August 14, 2025), Emma Rott

Re: Comment Letter for Draft Blacktail Creek Groundwater Hydraulic Control System Preliminary 30% Remedial Design Report (dated October 28, 2024), Emma Rott

Re: Comment Letter for the 2022 Butte Priority Soils Operable Unit (BPSOU) Groundwater Compliance Evaluation (dated March 10, 2025), Emma Rott

Re: Comment Letter for the 2023 Butte Priority Soils Operable Unit (BPSOU) Groundwater Compliance Evaluation (dated March 10, 2025), Emma Rott

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Butte Treatment Lagoons (BTL) Groundwater Treatment System Quarterly Operation and Maintenance Report – Quarter 2 2025 (dated September 30, 2025), Emma Rott

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Butte Treatment Lagoons (BTL) Groundwater Treatment System Routine Operations, Maintenance, and Monitoring (OM&M) Plan (dated December 10, 2024), Emma Rott

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Materials Management Plan (dated November 21, 2024), Emma Rott

Re: Comment letter for the Draft Final Silver Bow Creek Conservation Area Repository Data Gap Data Summary Report (dated January 3, 2025), Emma Rott

Re: Comment letter for the Final Butte Reduction Works (BRW) Smelter Area Waste Remediation and Contaminated Groundwater Hydraulic Control Site Air Monitoring Quality Assurance Project Plan (QAPP) for Interim Demolition Activities (dated May 19, 2025), Emma Rott

Re: Comments on the Draft Final Butte Mine Waste Repository Geotechnical Investigation Work Plan (dated September 23, 2025), Emma Rott

Re: Comments on the Repository, Haul Route, and Pipeline Geotechnical Pre-Design Investigation Summary Report (dated December 30, 2024), Emma Rott

Re: Comments on the Repository, Haul Route, and Pipeline Geotechnical Pre-Design Investigation Summary Report (dated May 13, 2025), Emma Rott

Re: Conditional Approval Letter for Butte Priority Soils (BPSOU) Draft Blacktail Creek Riparian Actions Remedial Design Work Plan (dated May 1, 2025, received July 28, 2025), Emma Rott

Re: Conditional approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Quarterly Operations and Maintenance Report Butte Treatment Lagoons (BTL) System – Third Quarter 2024 (dated December 23, 2024), Emma Rott

Re: Conditional Approval Letter for the Butte Priority Soils Operable Unit Clark Tailings Consolidated Waste Management Area Site Investigation Quality Assurance Project Plan Revision 0 (2025 Update) and Response to EPA Comments. (dated September 16, 2025), Emma Rott

Re: Conditional Approval Letter for the Final Butte Mine Waste Repository Geotechnical Investigation Work Plan (dated November 14, 2025), Emma Rott

Re: Condition Approval Letter for BPSOU Draft Final Phase I Design Investigation Evaluation Report, Blacktail Creek Riparian Actions (dated May 2, 2025, received July 28, 2025), Emma Rott

Re: Letter response to Butte Priority Soils Operable Unit (BPSOU) Continued Use of the Approved Groundwater Quality Assurance Project Plan Silver Bow Creek Butte Area NPL Site (dated September 15, 2025), Emma Rott

Re: Letter response to Butte Priority Soils Operable Unit (BPSOU) Continued Use of the Approved Surface Water Quality Assurance Project Plan Silver Bow Creek Butte Area NPL Site (dated September 15, 2025), Emma Rott

Technical Memorandum - RE: 2022 Butte Priority Soils Operable Unit (BPSOU) Groundwater Compliance Evaluation, Paddy Stoy

TECHNICAL MEMORANDUM - RE: 2022 Butte Priority Soils Operable Unit (BPSOU) Groundwater Compliance Evaluation, Paddy Stoy

Technical Memorandum - RE: 2022 Butte Priority Soils Operable Unit (BPSOU) Groundwater Compliance Evaluation, Paddy Stoy

Technical Memorandum - RE: 2023 Butte Priority Soils Operable Unit (BPSOU) Groundwater Compliance Evaluation, Paddy Stoy

February 2025 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

February 2025 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

Re: 2025 Spring Migration Seasonal Report for Berkeley Pit Waterfowl Protection Plan, Mark Thompson and Loren Burmeister

Re: August 2025 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

Re: December 2024 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

Re: January 2025 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

Re: July 2025 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

Re: June 2025 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

Re: Pilot Project 2025 Annual Update, Mark Thompson and Loren Burmeister

Butte Mine Flooding Operable Unit Berkeley Pit and Discharge Pilot Project – January 2025 Monthly Discharge Monitoring Report, Mark Thompson and Dave Griffis

DISCHARGE SYSTEM FIELD SAMPLING PLAN, 2025 UPDATE SILVER BOW CREEK/BUTTE AREA NPL SITE BUTTE MINE FLOODING OPERABLE UNIT | BUTTE, MONTANA, Mark Thompson and Dave Griffis

Re: Butte Mine Flooding Operable Unit Berkeley Pit and Discharge Pilot Project – August 2025 Monthly Discharge Monitoring Report, Mark Thompson and Dave Griffis

Re: Butte Mine Flooding Operable Unit Berkeley Pit and Discharge Pilot Project – December 2024 Monthly Discharge Monitoring Report, Mark Thompson and Dave Griffis

Re: Butte Mine Flooding Operable Unit Berkeley Pit and Discharge Pilot Project – July 2025 Monthly Discharge Monitoring Report, Mark Thompson and Dave Griffis

Re: Butte Mine Flooding Operable Unit Berkeley Pit and Discharge Pilot Project – June 2025 Monthly Discharge Monitoring Report, Mark Thompson and Dave Griffis

Re: Butte Mine Flooding Operable Unit Berkeley Pit and Discharge Pilot Project – May 2025 Monthly Discharge Monitoring Report, Mark Thompson and Dave Griffis

Re: BUTTE MINE FLOODING SITE CD, CV 02-35 Bu-RFC, 2024 Fourth Quarter Report, Mark Thompson and Dave Griffis

Re: BUTTE MINE FLOODING SITE CD, CV 02-35 Bu-RFC, 2025 Second Quarter Report, Mark Thompson and Dave Griffis

Settling Defendants BMFOU Annual Report Consent Decree for the Butte Mine Flooding Site CD, CV 02-35 Bu-RFC Remedial Action – Implementation of the Remedy Horseshoe Bend Water Treatment Plant 2024 Annual Report, Mark Thompson and Dave Griffis

On-Site Water Management Field Sampling Plan (FSP), 2025 Update, Mark Thompson and Rampart Solutions

Butte Priority Soils Operable Unit Clark Tailings Consolidated Waste Management Area Site Investigation Quality Assurance Project Plan (QAPP) Revision 0, Woodard & Curran

Butte Priority Soils Operable Unit Clark Tailings Consolidated Waste Management Area Site Investigation Quality Assurance Project Plan (QAPP) Revision 0, Woodard & Curran

Clark Tailings Consolidated Waste Management Area (CTCWMA) Site Investigation Draft Data Summary Report 2019 Surface Water, Groundwater Seep, and Soil Characterization 2021-2023 Surface Water and Groundwater Seep Evaluation 2023 Waterloo APS Soil and Groundwater Evaluation, Woodard & Curran

Clark Tailings Consolidated Waste Management Area (CTCWMA) Site Investigation Draft Data Summary Report 2024 Surface Water, Groundwater, and Soil Characterization, Woodard & Curran

DRAFT 2025 Interim Site-Wide Surface Water Monitoring Quality Assurance Project Plan, Woodard & Curran

DRAFT 2026 Interim Site-Wide Groundwater Monitoring Quality Assurance Project Plan, Woodard & Curran

DRAFT 2026 Interim Site-Wide Surface Water Monitoring Quality Assurance Project Plan, Woodard & Curran

Submissions from 2024 2024

PILOT PROJECT QUALITY ASSURANCE PROJECT PLAN 2024 UPDATE, Alloy Group

Butte Priority Soils Operable Unit (BPSOU) Draft Final Unreclaimed Sites Field Sampling Plan (FSP) Package #11: UR-49 and UR-50, Atlantic Richfield Company

TECHNICAL SPECIFICATIONS - Silver Bow Creek Conservation Area - 60% SUBMITTAL April 2024, Atlantic Richfield Company

REVISED FINAL MULTI-PATHWAY RESIDENTIAL METALS ABATEMENT PROGRAM PLAN, Atlantic Richfield Company and Butte Silver Bow

Residential Metals Abatement Program – Interior School Dust – Investigation Summary Report – After the Bell Child Care Center, Thomas J. Beckman, Christopher Berg, and Environmental Resource Management (ERM)

Residential Metals Abatement Program Construction Completion Report (Non- Residential Parcels – Indoor Dust) Butte Career Center / Webster Garfield, Christopher Berg and Thomas J. Beckman

Residential Metals Abatement Program Construction Completion Report (Non- Residential Parcels – Indoor Dust) East Middle School, Christopher Berg and Thomas J. Beckman

Residential Metals Abatement Program Construction Completion Report (Non- Residential Parcels – Indoor Dust) Kennedy Elementary, Christopher Berg and Thomas J. Beckman