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Silver Bow Creek/Butte Area Superfund Site

Submissions from 2025 2025

Revised Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 158 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Revised Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 30 – Atlantic-1 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Revised Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 32 – Corra 2 Dump Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Revised Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 37 – Josephine Shaft Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Revised Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 37 – Josephine Shaft Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Revised Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 38 – Sister Dump Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-06 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-12 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-13 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-20 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-22 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Revised Draft Final Annual Operations and Maintenance (O&M) Report: Butte Treatment Lagoon (BTL) System – 2023, Pioneer Technical Services, Inc.

Revised Draft Final BPSOU Unreclaimed Sites: UR-05 Remedial Action Work Plan (RAWP), Pioneer Technical Services, Inc.

Revised Draft Final Butte Priority Soils Operable Unit (BPSOU) Unreclaimed Sites: UR-03 Site Remedial Action Work Plan (RAWP), Pioneer Technical Services, Inc.

Revised Draft Final Butte Priority Soils Operable Unit (BPSOU) Unreclaimed Sites: UR-08 (Anderson Shaft) Remedial Action Work Plan (RAWP), Pioneer Technical Services, Inc.

Revised Draft Final Butte Treatment Lagoons (BTL) Groundwater Treatment System Routine Operations, Maintenance, and Monitoring (OM&M) Plan, Pioneer Technical Services, Inc.

Revised Draft Final Quarterly Operations and Maintenance Report Butte Treatment Lagoon System – First Quarter 2024, Pioneer Technical Services, Inc.

Revised Draft Final Quarterly Operations and Maintenance Report Butte Treatment Lagoon System – Second Quarter 2024, Pioneer Technical Services, Inc.

Approval Letter for Final BPSOU Insufficiently Reclaimed Sites Belle of Butte (BRES No. 8 & UR-39) Remedial Action Work Plan (RAWP) Request for Change IR-2024-RA-01, Revision 1 (dated December 13, 2024), Molly Roby

Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Unreclaimed Sites (UR-35) Remedial Action Work Plan (RAWP) (dated June 14, 2024), Molly Roby

Comment letter for the Butte Priority Soils Operable Unit (BPSOU) 2025 Draft Final Insufficiently Reclaimed Sites Quality Assurance Project Plan (dated February 14, 2025), Molly Roby

Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Butte Reclamation Evaluation System (BRES) Draft 2024 Field Evaluation Summary and Technical Recommendations Report (dated November 15, 2024), Molly Roby

Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Unreclaimed Sites UR-03 Remedial Action Work Plan (RAWP) (dated January 27, 2025)., Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final 2022 Unreclaimed Sites Sampling: UR-28 Site Evaluation Summary Report (dated April 23, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final 2025 Residential Metals Abatement Program (RMAP) Rock Creek Cattle Company Borrow Submittal #1 (dated May 23, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final BRES No. 35 Del Monte Reclamation Improvement Sites Field Sampling (FSP) (dated August 14, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final BRES No.94 – Rialto Dump Reclamation Improvement (RI) Field Sampling Plan (FSP) (dated August 21, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Insufficiently Reclaimed Sites Field Sampling (FSP): BRES No.177 - North Alice Culvert (dated August 21, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Insufficiently Reclaimed Sites Field Sampling Plan (FSP): BRES No. 100 – Capri Motel-Arctic Dump (dated August 12, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Insufficiently Reclaimed Sites Field Sampling Plan (FSP): BRES No. 18 – Walkerville Ballfield (dated August 13, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Insufficiently Reclaimed Sites Field Sampling Plan (FSP): BRES No. 26 – Cripple Dump (dated August 21, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Insufficiently Reclaimed Sites Remedial Action Work Plan (RAWP): BRES No. 104 – (Colorado Dump) North Slope (dated October 17, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Residential Metals Abatement Program Investigation Summary Report (Non‐Residential Parcels – Indoor Dust) – CCCS Gym Annex (dated October 4, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Final Insufficiently Reclaimed Sites Field Sampling Plan (FSP): UR- 19 – Butte, Anaconda & Pacific Railway from Montana Street to South Arizona Avenue – Montana Street Adjacent Parcel (dated August 13, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Final Multi-Pathway Residential Metals Abatement Program (RMAP) Plan (dated March 27, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Insufficiently Reclaimed Sites Sampling: BRES No. 84 Site Evaluation Summary Report (dated April 11, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 30 – Atlantic-1 Site Evaluation Summary Report (dated October 24, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 32 – Corra 2 Dump Site Evaluation Summary Report (dated October 24, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 37 – Josephine Shaft Site Evaluation Summary Report (dated October 16, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 38 – Sister Dump Site Evaluation Summary Report (dated September 30, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-13 Site Evaluation Summary Report (dated October 22, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-20 Site Evaluation Summary Report (dated October 24, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Insufficiently Reclaimed Sites BRES No. 158 Site Evaluation Summary Report (dated February 24, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Insufficiently Reclaimed Sites Field Sampling Plan (FSP): BRES No. 120 – Bonanza Dump (dated August 12, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Insufficiently Reclaimed Sites Quality Assurance Project Plan (dated May 27, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Reclamation Improvement Sites Field Sampling and Investigation Plan (FSP): BRES No. 45 – Garfield Response to Agency comments (dated August 14, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Unreclaimed Sites (UR-05) Remedial Action Work Plan (RAWP) (dated June 10, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Final Multi- Pathway Residential Metals Abatement Program (RMAP) Plan (dated January 13, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Insufficiently Reclaimed Sites BRES No. 158 – Waste Rock Dump Remedial Action Work Plan (RAWP) (dated June 24, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Unreclaimed Sites UR-46 Temporary Best Management Practices Work Plan (dated October 17, 2025), Molly Roby

Re: Approval letter for the Response to Comment Letter and the Butte Priority Soils Operable Unit (BPSOU) Draft 2024 Butte Reclamation Evaluation System (BRES) Corrective Action Plans for Reclaimed Sites (both dated June 6, 2025), Molly Roby

Re: Approval letter with comment for the Butte Priority Soils Operable Unit (BPSOU) 2025 Revised Draft Final Unreclaimed Sites: UR-03 Site Remedial Action Work Plan (RAWP) (dated June 2, 2025), Molly Roby

Re: Approval of the Butte Priority Soils Operable Unit (BPSOU) Butte Reclamation Evaluation System (BRES) Revised Draft 2024 Field Evaluation Summary and Technical Recommendations Report (dated June 4, 2025), Molly Roby

Re: Comment Letter for 2024 Annual Operations and Maintenance Report Butte Reclamation Evaluation System (BRES) Annual Summary Report for Work Completed in Quadrant 4 (dated May 1, 2025), Molly Roby

Re: Comment Letter for BPSOU Uncontrolled Surface Flow Areas Drainage C 30% Design RAWP (dated June 23, 2025), Molly Roby

Re: Comment Letter for Draft Final BPSOU Unreclaimed Site Anderson Shaft Remedial Action Work Plan (RAWP) (dated June 14, 2024), Molly Roby

Re: Comment Letter for Draft Final Butte Priority Soils Operable Unit (BPSOU) Unreclaimed Sites UR-05 Remedial Action Work Plan (RAWP) (dated March 14, 2025), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) 2022 Draft Final Insufficiently Reclaimed Sites Sampling BRES No. 30 – Atlantic 1 Site Evaluation Summary Report (dated February 24, 2025), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) 2022 Draft Final Insufficiently Reclaimed Sites Sampling: BRES No. 32 Site Evaluation Summary Report (dated December 11, 2024), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) 2022 Draft Final Insufficiently Reclaimed Sites Sampling: BRES No. 37 – Josephine Shaft Site Evaluation Summary Report (December 6, 2024), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) 2022 Draft Final Insufficiently Reclaimed Sites Sampling: BRES No. 38 – Sister Dump Site Evaluation Summary Report (December 31, 2024), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) 2024 Draft Final Backfill and Cover Material Quality Assurance Project Plan (dated September 27, 2024), Molly Roby

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 for the Butte Priority Soils Operable Unit (BPSOU) Revised Unreclaimed Sites UR-08 (Anderson Shaft) – Remedial Action Work Plan (RAWP) (dated October 24, 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: 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 for the Revised Butte Priority Soils Operable Unit (BPSOU) Butte Treatment Lagoons (BTL) Groundwater Treatment System Annual Operations, Maintenance, and Monitoring (OM&M) Plan – 2023 (dated October 29, 2025), Emma Rott

Re: Approval letter for the Revised Draft Final Annual Operations and Maintenance (O&M) Report: Butte Treatment Lagoon (BTL) System - 2023 (dated October 29, 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