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Documents and Resources

Fact Sheets
Thin Layer Cap Pilot Project, updated January 2025
Thin Layer Cap Pilot Anticipated Environmental Impacts, January 2025
Public Participation in Maine DEP Licensing Process, January 2025
Orrington Reach Capping Update: Thin Layer Cap Pilot, updated, August 2024
Remediation Trust Cleanup Progress Update, February 2024
Introducing the Penobscot Trusts, September 2023
Capping Contaminated Sediment in Orrington Reach, July 2023
Monitoring the Estuary Ecosystem For At Least 30 Years, April 2023
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Presentations

"At Last, Restoration of Maine's Longest River: The Unprecedented Cleanup of the Mighty Penobscot," March 3, 2025 – slide presentation and recording

Thin Layer Cap Pilot Project NRPA Permit Application Public Informational Meeting Presentation, February 5, 2025

Introduction to Penobscot Estuary Mercury Remediation Trust, Community Meeting Presentation, Frankfort, August 1, 2024

Overview of Orrington Reach Capping, Community Meeting Presentation, Orrington, July 19, 2023​​​​

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Flyers and Public Notices

Public Notice of Intent to File Application for Natural Resources Protection Act Permit, January 29, 2025

Thin Layer Cap Pilot Project and NRPA Permit Application Public Informational Meeting and Drop-in Session, February 5, 2​025

Remediation Trust Update Community Meeting and Drop-in Session, August 1, 2024

Orrington Reach Capping Community Meeting and Drop-in Session, July 19, 2023​​​

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Long-Term Monitoring Reports
2023–2024 Long-Term Monitoring Report, June 2025
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Work Plans and Investigation Reports​​
Bathymetric Survey Investigation Report, Orrington Reach Capping Remedy, December 2024​
Thin Layer Cap Pilot Project Work Plan, Orrington Reach Capping Remedy, May 2024
Thin Layer Cap Pilot Project Pre-Design Investigation Work Plan, Orrington Reach Capping Remedy, May 2024
River Flow Velocity Monitoring Investigation Report, Orrington Reach Capping Remedy, March 2024
Sediment Pre-Design Investigation Report, Orrington Reach Capping Remedy, March 2024
Sediment Pre-Design Investigation Report, Appendix C (Laboratory Reports), March 2024
Sediment Pre-Design Investigation Work Plan, Orrington Reach Capping Remedy, August 2023
Thin Layer Cap Design Work Plan, Orrington Reach Capping Remedy, July 2023
Coastal Wetland Assessment Plan, Orrington Reach Capping Remedy, July 2023
Long-Term Monitoring Plan, May 2023
Bathymetric Survey Work Plan, May 2023

Field Sampling and Analysis Plan, May 2023

Quality Assurance Project Plan, May 2023
Health and Safety Plan, March 2023

Emergency Response Plan, March 2023
River Flow Velocity Monitoring Work Plan, March 2023​​​

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Audit Reports

Remediation Trust 2022 and 2023 Auditors' Report

Project Trust 2022 and 2023 Auditors' Report

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Other Links

Beyond Holtrachem

Maine Department of Environmental Protection

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Consent Decree, October 2022

Consent Decree Appendices

Court Order on Consent Decree and Proposed Bar Order, August 2022​​

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Monitoring Reports

Black Duck Monitoring Report, April 2021 - Text, Figures, Tables

2020 Sediment, Water Quality, Aquatic Biota Monitoring Report, March 2021 - Text, Figures, Tables

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