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Most Recent Additions*

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

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

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

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 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: 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: Conditional Approval Letter for the Final Butte Mine Waste Repository Geotechnical Investigation Work Plan (dated November 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 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

Final Butte Mine Waste Repository Geotechnical Investigation Work Plan
Pioneer Technical Services, Inc.

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) 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) 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) 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

Final Butte Priority Soils Operable Unit (BPSOU) Insufficiently Reclaimed Sites Remedial Action Work Plan (RAWP): BRES No. 104 (Colorado Dump) North Slope
Pioneer Technical Services, Inc.

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

RE: Silver Bow Creek Butte Area NPL Site 4th Quarter 2023 Butte Priority Soils Operable Unit Interim Site-Wide Surface Water Monitoring Data Report. Consent Decree- Civil Action No. CV 89- 039-BU-SHE
Josh Bryson

RE: Silver Bow Creek Butte Area NPL Site 1 st Quarter 2023 Butte Priority Soils Operable Unit Interim Site-Wide Surface Water Monitoring Data Report. Consent Decree- Civil Action No. CV 89- 039-BU-SHE
Josh Bryson

RE: Silver Bow Creek Butte Area NPL Site Spring Semi-Annual 2023 Butte Priority Soils Operable Unit Interim Site-Wide Groundwater Monitoring Data Report. Consent Decree - Civil Action No. CV 89-039-BU-SHE
Josh Bryson

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

*Updated as of 12/14/25.