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Most Recent Additions*

Final Unreclaimed Sites Quality Assurance Project Plan (QAPP)
Pioneer Technical Services, Inc.

Final Insufficiently Reclaimed Sites Quality Assurance Project Plan (QAPP)
Pioneer Technical Services, Inc.

Third Butte RMAP Biomonitoring (Phase 3) Report
Ramboll and Atlantic Richfield Company

RFC - REQUEST FOR INFORMATION - Waste Rock Dump Stormwater Runoff Collection System Substitution
Molly Roby

Revised Draft Final Butte Mine Waste Repository Operation and Maintenance (O&M) Plan
Pioneer Technical Services, Inc.

RE: Response to Comment Letter (dated June 11, 2026) for the Butte Priority Soils Operable Unit (BPSOU) Draft 2025 Butte Reclamation Evaluation System (BRES) Corrective Action Plans for Reclaimed Sites (dated January 30, 2026)
Brandon Warner

Re: Approval Letter for the Quarterly Operations and Maintenance Report Grove Gulch Sedimentation Bay for Fourth Quarter 2025 Silver Bow Creek/Bute Area NPL Site – Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE (Dated May 15, 2026).
Emma Rott

Re: Approval Letter for the Quarterly Operations and Maintenance Report Grove Gulch Sedimentation Bay for First Quarter 2026 Silver Bow Creek/Bute Area NPL Site – Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE (Dated May 15, 2026).
Emma Rott

Subject: Quarterly Operations and Maintenance Report Grove Gulch Sedimentation Bay for Fourth Quarter 2025 and First Quarter 2026 Silver Bow Creek/Butte Area NPL Site – Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE
Josh Bryson

BPSOU Grove Gulch Sedimentation Bay Draft Remedial Action Construction Completion Report (CCR)
Woodard & Curran

SEPARATION OF FERRIC IONS FROM WASTE AQUEOUS SOLUTION USING SOLVENT EXTRACTION/PRECIPITATION PROCESS WITH DEEP EUTECTIC SOLVENTS AND RESONANT ACCOUSTIC MIXING
Frank Agyemang

Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 16 Site Evaluation Summary Report
Pioneer Technical Services, Inc.

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

Draft Final Butte Priority Soils Operable Unit Unreclaimed Sites: UR-35 Construction Completion Report (CCR)
Pioneer Technical Services, Inc.

Re: Draft Final Butte Priority Soils Operable Unit Unreclaimed Sites Field Sampling and Investigation Plan: UR-53 – South of Surprise Dump
Mike McAnulty

Re: Draft Final Butte Priority Soils Operable Unit Unreclaimed Sites Field Sampling and Investigation Plan: UR-52 Area West of BRES No. 133 – Dexter Mill
Mike McAnulty

Re: Draft Final Butte Priority Soils Operable Unit Unreclaimed Sites Field Sampling and Investigation Plan: UR-51 –Area near BRES No. 50 – Zelia and Mountain Con Mine
Mike McAnulty

Re: Draft Final Butte Priority Soils Operable Unit Unreclaimed Sites Field Sampling and Investigation Plan: UR-41 – Montana Street and Interstate-90
Mike McAnulty

Draft Final 2023 Reclamation Improvement Sites Sampling: BRES No. 31 – Waste Dump #5 Site Evaluation Summary Report
Pioneer Technical Services, Inc.

Draft Final 2023 Reclamation Improvement Sites Sampling: BRES No. 17 – Paymaster Dump Site Evaluation Summary Report
Pioneer Technical Services, Inc.

*Updated as of 09/15/26.