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Most Recent Additions*

Butte Priority Soils Operable Unit Final Reclamation Improvement Field Sampling and Investigation Plan: BRES No. 171 – Blaine Center
Pioneer Technical Services, Inc.

Draft Final Quarterly Operations and Maintenance Report: Butte Treatment Lagoon System – Second Quarter 2026
Pioneer Technical Services, Inc.

2026 Final BPSOU Backfill and Cover Material Quality Assurance Project Plan (QAPP)
Pioneer Technical Services, Inc.

RE: Request for Change to the Butte Priority Soils Operable Unit Clark Tailings Consolidated Waste Management Area Site Investigation Quality Assurance Project Plan Revision 0 (2026 Update)
Josh Bryson

Final 2023 Unreclaimed Sites Sampling: UR-42 Site Evaluation Summary Report
Pioneer Technical Services, Inc.

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Draft 2025 Site-Wide Surface Water Monitoring Data Summary Report (dated May 29, 2026)
Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Butte Reduction Works Smelter Area Intermediate 60% Remedial Design Submittal (dated May 19, 2026)
Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Draft 2025 Groundwater Monitoring Data Summary Report January – December 2025 (dated May 29, 2026)
Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) 2025 Surface Water Compliance Evaluation Technical Memorandum (dated June 29, 2026)
Emma Rott

Re: Approval Letter for the Butte Priority Soils Operable Unit (BPSOU) Final 2026 Interim Site- Wide Surface Water Monitoring Quality Assurance Project Plan (QAPP) (dated August 28, 2026)
Emma Rott

Re: Approval Letter for the Final 2026 Interim Site-Wide Groundwater Monitoring Quality Assurance Project Plan (dated August 28, 2026)
Emma Rott

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Reclamation Improvement Field Sampling and Investigation Plan: BRES No. 180 – Tullamore Dump
Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Reclamation Improvement Field Sampling and Investigation Plan: BRES No. 171 – Blaine Center
Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Reclamation Improvement Field Sampling and Investigation Plan: BRES No. 160S – Syndicate Pit Dumps
Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit Draft Final Reclamation Improvement Field Sampling and Investigation Plan: BRES No. 75 – National Dump
Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Reclamation Improvement Field Sampling and Investigation Plan: BRES No. 68 – Little Mina-2
Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Reclamation Improvement Field Sampling and Investigation Plan: BRES No. 57 – Little Mina-1
Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Reclamation Improvement Field Sampling and Investigation Plan: BRES No. 9 – Clark Street Dump
Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit Draft Final 2023 Insufficiently Reclaimed Sites Sampling: BRES No. 93 – Soudan Dump Site Evaluation Summary Report
Molly Roby

RE: Butte Priority Soils Operable Unit (BPSOU) Final BPSOU Unreclaimed Sites Anderson Shaft Remedial Action Work Plan (RAWP) Request for Change UR-2026-RA-01
Mike McAnulty

*Updated as of 10/06/26.