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Silver Bow Creek/Butte Area Superfund Site

Submissions from 2024 2024

Comment/Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Insufficiently Reclaimed Sites Field Sampling Plans (FSPs) for BRES No. 121 – Travona Dump, BRES No. 125 – Child Harold-2 Dump, BRES No. 34E – Eveline Dump East, BRES No. 45 – Garfield, BRES No. 49 – Old Glory, BRES No. 52 – Moscow, BRES No. 74 – West Gagnon Dump, and BRES No. 78 Original Mine (dated May 7, 2024), Molly Roby

Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Insufficiently Reclaimed Sites Belle of Butte (BRES No. 8 & UR-39) Remedial Action Work Plan (RAWP), Molly Roby

Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Insufficiently Reclaimed Sites Field Sampling Plan (FSP) for BRES No. 181 – Mountain Con-3 Dump, Molly Roby

Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Reclaimed Areas Weed Management Plan (dated April 11, 2024), Molly Roby

Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Residential Metals Abatement Program (RMAP) Yard Submittals Round 2 (dated July 25, 2024), Molly Roby

Comments for the 2024 Butte Priority Soils (BPSOU) Residential Metals Abatement Program (RMAP) – Quality Assurance Project Plan (QAPP) for Non-Residential Parcels and Residential Daycares (dated May 23, 2024), Molly Roby

Comments for the Butte Priority Soils (BPSOU) Residential Metals Abatement Program (RMAP) – Interior School Dust – Investigation Summary Report – Gold Hill Lutheran (dated February 5, 2024), Molly Roby

Conditional approval letter for the 2024 Butte Priority Soils (BPSOU) Residential Metals Abatement Program (RMAP) – Quality Assurance Project Plan (QAPP) Annual Update (Non-Residential Parcels and Residential Daycares) (dated July 1, 2024), Molly Roby

Re: Approval for the Response to Comments Letter (dated May 21, 2024) for the Butte Priority Soils Operable Unit (BPSOU) Butte Reclamation Evaluation System (BRES) Draft 2023 BRES Field Evaluation Summary Report and Technical Recommendations Proposal (dated November 15, 2023) and 2023 Corrective Action Plans (CAPs) for Reclaimed Sites (dated January 31, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU), Draft 2024 Residential Metals Abatement Program Investigation Summary Report (Non-Residential – Interior Dust) After the Bell Child Care Center (dated April 25, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU), Draft 2024 Residential Metals Abatement Program Investigation Summary Report (Non-Residential Parcels – Indoor Dust) – Montana Technological University (Prospector Residence Hall) (dated March 21, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU), Draft Final 2021-2022 Residential Metals Abatement Program – Aware Early Head Start Soil Remedial Action Construction Completion Report (dated April 26, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU), Draft Final 2021 Residential Metals Abatement Program – Head Start (former Lincoln School) Soil Remedial Action Construction Completion Report (dated April 26, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final 2024 Helehan Borrow Material Submittal #2 (dated March 12, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final 2024 Residential Metals Abatement Program Mandan Park Soil RAWP (dated May 10, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final 2024 Residential Metals Abatement Program Park Soil Sampling Field Sampling Plan Submittal #13 [Copper Mountain Park] (dated May 10, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final 2024 Residential Metals Abatement Program Park Soil Sampling Field Sampling Plan Submittal #14 [Silver Bow Homes Park, Butte KOA, Fairmont RV Park, and CCCS Gymnasium] (dated May 10, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final 2024 Type B Borrow Material Submittal #2 (dated February 14, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Borrow Amendment Submittal #1 (dated May 9, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU), Draft Final Residential Metals Abatement Program Investigation Summary Report (Non-Residential – Interior School Dust) - Gold Hill Lutheran Church (Creativity Factory Preschool) (dated April 8, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Residential Metals Abatement Program Investigation Summary Report (Non-Residential Parcels – Indoor Dust) – United Congregational Church (Crayon Academy Preschool) (dated April 2, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Residential Metals Abatement Program (RMAP) – Interior School Dust - Investigation Summary Report – East Middle School (dated January 16, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Revised Residential Metals Abatement Program (RMAP) Quality Assurance Project Plan (QAPP) (Residential Parcels) (dated June 7, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Unreclaimed Sites Field Sampling Plan (FSP) Package #11: UR-49 and UR-50 (dated May 6, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Unreclaimed Sites Field Sampling Plan (FSP) Package #11: UR-49 and UR-50 (dated May 6, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU), Draft Residential Metals Abatement Program Construction Completion Report (Non-Residential Parcels – Indoor Dust) – Kennedy Elementary (dated April 17, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Residential Metals Abatement Program Construction Completion Report (Non‐Residential Parcels – Indoor Dust) – Silver Bow Montessori (dated April 25, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU), Draft Residential Metals Abatement Program Construction Completion Report (Non-Residential Parcels - Indoor Dust) – Small World Daycare (dated April 17, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Residential Metals Abatement Program (RMAP) – Interior School Dust – Investigation Summary Report (ISR) – Kennedy Elementary School Post-Remedial Action Surface Dust Sampling (dated June 12, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Final BPSOU Insufficiently Reclaimed Sites Belle of Butte (BRES No. 8 & UR-39) Remedial Action Work Plan (RAWP) Request for Change IR-2024-RA-02 (dated December 19, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Request for Change (RFC-RMAP-2024-001) (dated May 9, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Request for Change (RFC-RMAP-2024-001) (dated May 9, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Residential Metals Abatement Program (RMAP) Residential Daycares Field Sampling Plan (FSP) – Submittal R- 04941 and R-04947 (dated November 5, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Insufficiently Reclaimed Sites Field Sampling Plans (FSPs) and Response to Agency Comments – BRES No. 34E Eveline Dump East, BRES No. 52 Moscow Dump (dated August 13, 2024) and the BRES No. 78 Original Mine Yard (updated on September 6, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Unreclaimed Sites and Insufficiently Reclaimed Areas – Racetrack Borrow Material Usage (dated December 19, 2024), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit, Residential Metals Abatement Program Construction Completion Report (Non-Residential Parcels-Indoor Dust) - Butte Career Center/Webster Garfield (dated March 29, 2024), Molly Roby

Re: Approval letter with comments for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Insufficiently Reclaimed Sites Field Sampling Plan (FSP) for BRES No. 181 – Mountain Con-3 Dump (dated October 4, 2024), Molly Roby

Re: Approval of the Butte Priority Soils Operable Unit Residential Metals Abatement Program Yard Submittals (dated April 24, 2024) and Draft RMAP Remedial Action Work Plan (dated May 7, 2024), Molly Roby

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Residential Metals Abatement Program (RMAP) Individual Site Work Plan (ISWP) Attic Remediation – 3 Pintlar Peaks Dr. (dated October 24, 2024), Molly Roby

Re: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Residential Metals Abatement Program (RMAP) Plan (dated October 29, 2024), Molly Roby

Re: Comment 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 (dated December 3, 2024), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) 2022 Draft Final Insufficiently Reclaimed Sites Sampling: BRES No. 158 Site Evaluation Summary Report (dated November 21, 2024), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Butte Hill Revegetation Specifications (dated September 2024), Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Insufficiently Reclaimed Sites Field Sampling Plan (FSP) for BRES No. 120 – Bonanza Dump (dated July 22, 2024), Molly Roby

Re: Comments for the Butte Priority Soils Operable Unit (BPSOU) Butte Reclamation Evaluation System (BRES) Draft 2023 BRES Field Evaluation Summary Report and Technical Recommendations Proposal (dated November 15, 2023) and 2023 Corrective Action Plans for Reclaimed Sites (dated January 31, 2024), Molly Roby

Re: Comments for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Unreclaimed Sites Quality Assurance Project Plan (QAPP) (dated February 26, 2024), Molly Roby

EPA Remedial Project Manager Change, Consent Decree for the Butte Priority Soils Operable Unit, Civil Action No. CV89-039-BU-SEH, Molly Roby and Emma Rott

Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Residential Metals Abatement Program (RMAP) (Non-Residential) - Interior School Dust - Investigation Summary Report–– Emerson Elementary (dated October 13, 2023), Emma Rott

Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Quarterly Operations and Maintenance Report Butte Treatment Lagoon System – Fourth Quarter 2022 (dated July 3, 2024), Emma Rott

Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Quarterly Operations and Maintenance Report Butte Treatment Lagoon System -Third Quarter 2022 (dated November 16, 2023), Emma Rott

Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Quarterly Operations and Maintenance Report Butte Treatment Lagoon System – Third Quarter 2023 (dated October 15, 2024), Emma Rott

Comment Letter for BPSOU Draft Phase I Design Investigation Evaluation Report (dated September 25, 2024), Emma Rott

Comment Letter for Butte Reduction Works (BRW) Phase II Interim Demolition Plan Construction Drawings and Floodplain Encroachment Analysis (dated September 3, 2024), Emma Rott

Comment Letter for Draft Final BPSOU Quarterly Operations and Maintenance Report Butte Treatment Lagoon System – First Quarter 2024 (dated June 26, 2024), Emma Rott

Comment Letter for Draft Final BPSOU Quarterly Operations and Maintenance Report Butte Treatment Lagoon System-Second Quarter 2024 (dated September 27, 2024), Emma Rott

Comment Letter for 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 September 25, 2024), Emma Rott

Comments for the Draft Residential Metals Abatement Program – Interior School Dust – Investigation Summary Report – United Congregational (Crayon Factory Preschool) (dated November 16, 2023), Emma Rott

Re: Approval Letter Butte Priority Soils Operable Unit Resubmittal of the Grove Gulch Sedimentation Bay 100% Remedial Design (submitted on July 10, 2024), Emma Rott

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Butte Reduction Works (BRW) Phase II Interim Demolition Plan Construction Drawings and Floodplain Encroachment Analysis (dated November 27, 2024), Emma Rott

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Quarterly Operations and Maintenance Report Butte Treatment Lagoon System – Fourth Quarter 2023 (dated March 28, 2024), Emma Rott

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Residential Metals Abatement Program (RMAP) Construction Completion Report (Non-Residential Parcels – Indoor Soil) – Butte High School (dated February 12, 2024), Emma Rott

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Butte Reduction Works (BRW) Phase III Quality Assurance Project Plan (QAPP) Request of Change BRW-2024-01 (dated August 30, 2024)., Emma Rott

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Quarterly Operations and Maintenance Report Butte Treatment Lagoon System – Second Quarter 2023 (dated October 15, 2024), Emma Rott

Re: Approval of the Draft Final Silver Bow Creek Conservation Area Repository and Haul Route Quality Assurance Project Plan (QAPP) (dated June 10, 2024), Emma Rott

Re: Approval of the Revised Draft Final Silver Bow Creek Conservation Area Repository Data Gap Quality Assurance Project Plan (QAPP) (dated 5/7/24), Emma Rott

Re: Comment Letter for BPSOU Draft Phase I Design Investigation Evaluation Report (dated September 25, 2024), Emma Rott

Re: Comment Letter for BPSOU Draft Phase I Design Investigation Evaluation Report (dated September 25, 2024), Emma Rott

Re: Comment Letter for Draft BPSOU 2023 Groundwater Data Summary Report (dated May 31, 2024), Emma Rott

Re: Comment Letter for Draft BPSOU 2023 Site-wide Surface Water Data Summary Report (dated May 31, 2024), Emma Rott

Re: Comment Letter for Draft BPSOU Blacktail Creek Riparian Actions Remedial Design Work Plan (RDWP) (dated April 4, 2024), Emma Rott

Re: Comment Letter for Draft Clark Tailings Consolidated Waste Management Area (CTCWMA) Site Investigation Draft Data Summary Report 2019-2023 (dated October 3, 2024), Emma Rott

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Diggings East 60% Remedial Design Package Submittal (dated April 23, 2024), Emma Rott

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Butte Treatment Lagoons Stress Test Pre-Design Investigation Work Plan (dated June 17, 2024), Emma Rott

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final 2023 BPSOU Subdrain Data Summary Report (dated May 1, 2024), Emma Rott

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Annual Operations and Maintenance Report Butte Treatment Lagoon System – 2023 (dated May 28, 2024), Emma Rott

Re: Comment Letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Blacktail Creek Groundwater Hydraulic Control System Pre-Design Investigation Evaluation Report (dated September 16, 2024), Emma Rott

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) Silver Bow Creek Conservation Area (SBCCA) Technical Specifications 60 Percent Submittal (dated April 24, 2024), Emma Rott

Re: Comment 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 October 10, 2024), Emma Rott

Re: Comments on the 2024 Draft Final Butte Priority Soils Operable Unit (BPSOU) Interim Site- Wide Groundwater Monitoring Quality Assurance Project Plan (QAPP) (dated November 29, 2023), Emma Rott

Re: Comments on the Repository and Haul Route Geotechnical Pre-Design Investigation Work Plan (dated March 29, 2024), Repository and Proposed Haul Route – Silver Bow Creek Conservation Area Quality Assurance Project Plan (dated March 29, 2024), and Silver Bow Creek Conservation Area Repository Data Gap Quality Assurance Project Plan (dated March 22, 2024), Emma Rott

Re: Conditional Approval Letter Butte Priority Soils Operable Unit Grove Gulch Sedimentation Bay 100% Remedial Design (dated March 22, 2024), Emma Rott

Re: Conditional approval letter for the Butte Priority Soils Operable Unit (BPSOU) Butte Reduction Works (BRW) Phase III Quality Assurance Project Plan (QAPP) Request of Change BRW-2024-01 (dated August 9, 2024)., Emma Rott

Re: Conditional approval letter for the Butte Priority Soils Operable Unit (BPSOU) Silver Bow Creek Conservation Area Repository Data Gap Quality Assurance Project Plan Request for Change to Install Additional Test Pits and Perform Material Characterization (dated August 28, 2024), Emma Rott

2024 Draft Blacktail Creek Remediation and Contaminated Groundwater Hydraulic Control Site Pre-Design Investigation Work Plan, Stantec Consulting Services, Inc.

APPENDIX D COMPARISON OF HISTORICAL COC RESULTS TO GROUNDWATER REMEDIAL GOALS, Stantec Consulting Services, Inc.

BLACKTAIL CREEK (BTC) PUMPING TEST INTERPRETATION TECHNICAL MEMORANDUM, Stantec Consulting Services, Inc.

Draft Final Blacktail Creek Groundwater Hydraulic Control System Pre-Design Investigation Evaluation Report, Stantec Consulting Services, Inc.

GROUNDWATER MODEL TECHNICAL MEMORANDUM, Stantec Consulting Services, Inc.

Response to Agency Comments on the Butte Priority Soils Operable Unit (BPSOU) Draft Blacktail Creek Groundwater Hydraulic Control System Pre-Design Investigation Evaluation Report Prepared for Atlantic Richfield Company By Stantec Consulting Services, Inc. Dated September 12, 2024 Date of Comments: February 1, 2024, Stantec Consulting Services, Inc.

2024 Spring Migration Seasonal Report for Berkeley Pit Waterfowl Protection Plan, Mark Thompson and Loren Burmeister

July 2024 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

June 2024 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

May 2024 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

November 2024 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

October 2024 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

Re: August 2024 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

RFC-Berkeley Pit WPP-2024-02, Mark Thompson and Loren Burmeister

September 2024 Berkeley Pit Migratory Waterfowl Protection Monthly Report, Mark Thompson and Loren Burmeister

Berkeley Pit and Discharge Pilot Project Temperature Evaluation, 2023 Update, Mark Thompson and Dave Griffis

Butte Mine Flooding Operable Unit Berkeley Pit and Discharge Pilot Project - July 2024 MOnthly Discharge Monitoring Report, Mark Thompson and Dave Griffis