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Most Recent Additions*

DRAFT FINAL REMEDIAL DESIGN WORK PLAN BLACKTAIL CREEK RIPARIAN ACTIONS BUTTE PRIORITY SOILS OPERABLE UNIT OF THE SILVER BOW CREEK/BUTTE AREA SUPERFUND SITE SILVER BOW COUNTY, MONTANA
HydroGeoLogic, Inc.

DRAFT FINAL PHASE I PRE-DESIGN INVESTIGATION EVALUATION REPORT BLACKTAIL CREEK RIPARIAN ACTIONS BUTTE PRIORITY SOILS OPERABLE UNIT OF THE SILVER BOW CREEK/BUTTE AREA SUPERFUND SITE SILVER BOW COUNTY, MONTANA
HydroGeoLogic, Inc.

RESPONSE TO EPA COMMENTS DATED SEPTEMBER 29, 2025 FOR THE BLACKTAIL CREEK RIPARIAN ACTIONS DRAFT PRELIMINARY (30%) REMEDIAL DESIGN REPORT, SILVER BOW CREEK/BUTTE AREA SUPERFUND SITE SILVER BOW COUNTY, MONTANA
Montana Department of Environmental Quality

DRAFT INTERMEDIATE (60%) REMEDIAL DESIGN REPORT BLACKTAIL CREEK RIPARIAN ACTIONS BUTTE PRIORITY SOILS OPERABLE UNIT OF THE SILVER BOW CREEK/BUTTE AREA SUPERFUND SITE SILVER BOW COUNTY, MONTANA
HydroGeoLogic, Inc.

Draft Final Annual Operations and Maintenance (O&M) Report: Butte Treatment Lagoon (BTL) System – 2025
Pioneer Technical Services, Inc.

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

Draft Final 2024 Reclamation Improvement Sampling: BRES No. 78 – Original Mine Yard Site Evaluation Summary Report
Pioneer Technical Services, Inc.

Re: Conditional Approval Letter for Draft Final 2026 Interim Site-Wide Groundwater Monitoring Quality Assurance Project Plan (dated May 6, 2026)
Emma Rott

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

Re: Comment Letter for Old Butte Silver Bow Landfill/Clark Tailings Consolidated Waste Management Area (CTCWMA) Remedy Effectiveness Evaluation Phase I (Conceptual Site Model) (dated February 27, 2026)
Emma Rott

Re: Conditional approval Letter for the Butte Priority Soils Operable Unit (BPSOU) Clark Tailings Consolidated Waste Management Area (CTCWMA) Site Investigation Quality Assurance Project Plan (QAPP) (dated April 16, 2026)
Emma Rott

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Quarterly Operation and Maintenance Report: Butte Treatment Lagoons (BTL) System– Fourth Quarter 2025 (dated March 30, 2026)
Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit Draft Leak Detection Monitoring Plan (dated February 2026)
Emma Rott

Butte Priority Soils Operable Unit (BPSOU) 2026 Monthly Progress Report. Consent Decree for the Butte Priority Soils Operable Unit. Civil Action No. CV 89-039-BU-SEH
Josh Bryson

Re: Comment Letter for Draft Final 2026 Interim Site-Wide Groundwater Monitoring Quality Assurance Project Plan (dated April 17, 2026)
Emma Rott

Response to 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 April 10, 2025)
Abby Peltomaa

Re: Conditional Approval Letter for Diggings East 95 % Remedial Design Package Submittal (dated March 25, 2006), the Silver Bow Creek Conservation Area (SBCCA) – 95 Percent Programmatic Technical Specifications Submittal (dated March 25, 2026), the Butte Priority Soils Operable Unit (BPSOU) SBCCA Operations and Maintenance (O&M) Plan (dated March 24, 2026), and the SBCCA Final Principles for a Greener Cleanup Report (dated February 4, 2026)
Emma Rott

DRAFT UNIFORM FEDERAL POLICYQUALITY ASSURANCE PROJECT PLAN ADDENDUM
HydroGeoLogic, Inc.

Re: Conditional Approval Letter for Draft Final Silver Bow Creek Conservation Area Materials Management Plan Revision 1 (dated March 24, 2026)
Emma Rott

Re: Conditional Approval Letter for Final Silver Bow Creek Conservation Area (SBCCA) Construction Quality Assurance Plan and Draft Final Silver Bow Creek Conservation Area (SBCCA) Construction Monitoring Quality Assurance Project Plan (dated April 7, 2026)
Emma Rott

*Updated as of 05/24/26.