--- title: Between the Trees Blog | habitat restoration description: habitat restoration | Our official blog including Brennan company news, videos, and project overviews from the field. image: https://www.jfbrennan.com/hubfs/home_page/Between-the-trees-blog.jpg --- [MENU **](https://www.jfbrennan.com/blog/topic/habitat-restoration#mobile-nav) Submit - ** - [About Us](https://www.jfbrennan.com/about-us) - History - [Culture](https://www.jfbrennan.com/culture) - [Contact Us](https://www.jfbrennan.com/contact-us) - [Blog](https://www.jfbrennan.com/blog) - [Careers](https://www.jfbrennan.com/careers) - [Why Brennan?](https://www.jfbrennan.com/careers/why-brennan) - [Benefits](https://www.jfbrennan.com/careers/professional-and-technical) - [Current Openings](https://www.jfbrennan.com/careers/current-openings) - Online Application - [Brennan Gives Back](https://www.jfbrennan.com/givesback) - [Plan Room](http://www.brennanopr.com/) [![J.F. Brennan Company, Inc.](https://www.jfbrennan.com/hubfs/images/j-f-brennan-company-logo-horizontal.png) ![J.F. Brennan Company, Inc.](https://www.jfbrennan.com/hubfs/images/j-f-brennan-company-logo-horizontal.png) ](https://www.jfbrennan.com/) - [Environmental](https://www.jfbrennan.com/environmental) - [Dewatering Services](https://www.jfbrennan.com/environmental/separation-and-dewatering) - [Environmental Dredging](https://www.jfbrennan.com/environmental/environmental-dredging) - [Hydraulic Dredging](https://www.jfbrennan.com/environmental/hydraulic-dredging) - [Mechanical Dredging](https://www.jfbrennan.com/environmental/mechanical-dredging) - [Amphibious Dredging](https://www.jfbrennan.com/environmental/amphibious-dredging) - [Diver-Assisted Micro Dredging](https://www.jfbrennan.com/environmental/diver-assisted-micro-dredging) - [Material Transport](https://www.jfbrennan.com/environmental/material-transport) - [Hydrographic Survey](https://www.jfbrennan.com/environmental/hydrographic-survey) - [Habitat Restoration](https://www.jfbrennan.com/environmental/habitat-restoration) - [Isolation Barriers](https://www.jfbrennan.com/environmental/isolation-barriers) - [Mobile Water Treatment Trailer](https://www.jfbrennan.com/environmental/mobile-water-treatment-trailer) - [Sand Covers and Capping](https://www.jfbrennan.com/environmental/sand-covers-and-capping) - [Broadcast Capping System](https://www.jfbrennan.com/environmental/broadcast-capping-system) - [Mechanical Placement](https://www.jfbrennan.com/environmental/mechanical-placement) - [Armament](https://www.jfbrennan.com/environmental/armament) - [Treatability Testing](https://www.jfbrennan.com/environmental/treatability) - [Water Treatment ](https://www.jfbrennan.com/environmental/water-treatment) - [Wetland Remediation](https://www.jfbrennan.com/environmental/wetland-remediation) - [Marine Construction](https://www.jfbrennan.com/marine-construction) - [Submarine Cable Services](https://www.jfbrennan.com/submarine-cable) - [Dock Structures & Barge Terminals](https://www.jfbrennan.com/marine-constuction/dock-structures-and-barge-terminals) - [Deep Foundations](https://www.jfbrennan.com/marine-construction/deep-foundations) - [Dredging](https://www.jfbrennan.com/marine-construction/dredging) - [Underwater Inspections & Survey](https://www.jfbrennan.com/marine-construction/underwater-inspections-and-survey) - [Dive Inspections](https://www.jfbrennan.com/marine-construction/dive-inspections) - [Acoustic Imaging](https://www.jfbrennan.com/marine-construction/acoustic-imaging) - [Hydrographic Survey](https://www.jfbrennan.com/marine-construction/hydrographic-survey) - [Side Scan Sonar](https://www.jfbrennan.com/marine-construction/side-scan-sonar) - [ROV](https://www.jfbrennan.com/marine-construction/rov) - [Underwater Construction](https://www.jfbrennan.com/marine-construction/underwater-construction) - [Maritime Security Barrier Systems](https://www.jfbrennan.com/maritime-security-barriers) - [Bridge Construction](https://www.jfbrennan.com/marine-construction/bridge-construction) - [Construction & Replacements](https://www.jfbrennan.com/marine-construction/construction-and-replacements) - [Piers & Abutments](https://www.jfbrennan.com/marine-construction/piers-and-abutments) - [Scour & Erosion](https://www.jfbrennan.com/marine-construction/scour-and-erosion) - [Protection Systems](https://www.jfbrennan.com/marine-construction/protection-systems) - [Marine Support](https://www.jfbrennan.com/marine-construction/marine-support) - [Dam Construction](https://www.jfbrennan.com/dam-construction) - [Concrete Placement](https://www.jfbrennan.com/dam-construction/concrete-placement) - [Mass Pours](https://www.jfbrennan.com/dam-construction/mass-pours) - [Concrete Repairs](https://www.jfbrennan.com/dam-construction/concrete-repairs) - [Precast Components](https://www.jfbrennan.com/dam-construction/precast-components) - [Preplaced Aggregate Concrete](https://www.jfbrennan.com/dam-construction/preplaced-aggregate-concrete) - [Grouting](https://www.jfbrennan.com/dam-construction/grouting) - [Leave in Place Formwork](https://www.jfbrennan.com/dam-construction/leave-in-place-formwork) - [Gates and Actuators](https://www.jfbrennan.com/dam-construction/gates-actuators) - [Intakes & Headworks](https://www.jfbrennan.com/dam-construction/intakes-and-headworks) - [Underwater Inspections & Survey](https://www.jfbrennan.com/dam-construction/underwater-inspections-and-survey) - [Dive Inspections](https://www.jfbrennan.com/dam-construction/dam-inspection-diver-services) - [Acoustic Imaging](https://www.jfbrennan.com/dam-construction/acoustic-imaging) - [Hydrographic Survey](https://www.jfbrennan.com/dam-construction/hydrographic-survey) - [Side Scan Sonar](https://www.jfbrennan.com/dam-construction/side-scan-sonar) - [ROV](https://www.jfbrennan.com/dam-construction/rov-inspections) - [Underwater Construction](https://www.jfbrennan.com/dam-construction/underwater-construction) - [Cofferdams](https://www.jfbrennan.com/dam-construction/cofferdams) - [Scour & Erosion](https://www.jfbrennan.com/dam-construction/scour-and-erosion) - [Harbor Management](https://www.jfbrennan.com/harbor-management) - [Switching and Fleeting](https://www.jfbrennan.com/harbor-management/switching-and-fleeting) - [Barge Cleaning](https://www.jfbrennan.com/harbor-management/barge-cleaning) - [Dry Dock Vessel Repairs](https://www.jfbrennan.com/harbor-management/dry-dock-vessel-repairs) - [Short Haul Towing](https://www.jfbrennan.com/harbor-management/short-haul-towing) - [Marine Assists](https://www.jfbrennan.com/harbor-management/marine-assists) - [Contact Dispatch](https://www.jfbrennan.com/harbor-management/contact-dispatch) - [Customer Login](https://www.jfbrennan.com/customer-login) - [Railroad](https://www.jfbrennan.com/railroad) - [Bridge Construction](https://www.jfbrennan.com/railroad/bridge-construction) - [Construction & Replacements](https://www.jfbrennan.com/railroad/bridge-construction-and-replacements) - [Piers & Abutments](https://www.jfbrennan.com/railroad/piers-and-abutments) - [Scour & Erosion](https://www.jfbrennan.com/railroad/scour-and-erosion-repairs) - [Protection Systems](https://www.jfbrennan.com/railroad/bridge-protection-systems) - [Demolition](https://www.jfbrennan.com/railroad/demolition) - [Underwater Inspections & Survey](https://www.jfbrennan.com/railroad/underwater-inspections-and-survey) - [Culverts](https://www.jfbrennan.com/railroad/culverts) - [Environmental Response](https://www.jfbrennan.com/railroad/environmental-response) - [Marine Support](https://www.jfbrennan.com/railroad/marine-support) [MENU **](https://www.jfbrennan.com/blog/topic/habitat-restoration#mobile-nav) [![J.F. Brennan Company at Thomson Reservoir](https://www.jfbrennan.com/hubfs/2025%20iBoss%20Thomps---Spreader%20Barge-144.jpeg) ](https://www.jfbrennan.com/blog/powdered-activated-carbon-capping-largest-remediation-project) ## [PAC Delivery for the Largest Remediation Project of Its Kind](https://www.jfbrennan.com/blog/powdered-activated-carbon-capping-largest-remediation-project) Posted by [Casey Evenson](https://www.jfbrennan.com/blog/author/casey-evenson) on February 05, 2026 ## **Addressing Dioxin and Furan Contamination ** Under the Great Lakes Legacy Act, and in partnership with the Minnesota Pollution Control Agency (MPCA) and an industry partner, the US Environmental Protection Agency’s (EPA) Great Lakes National Program Office requested construction services to address dioxin and furan contamination within Thomson Reservoir. The project, located in Carlton, Minnesota, was awarded to Brennan in the spring of 2024. Our contract included placing a thin layer of amendment containing 10% powdered activated carbon (PAC) across the reservoir to address approximately 225,000 cubic yards of contaminated sediment. This remedy represents the largest remediation project of its kind implemented in the United States to date and is designed to reduce the bioavailability of toxins in surface sediments to macroinvertebrates, an essential food source for fish. [Read More](https://www.jfbrennan.com/blog/powdered-activated-carbon-capping-largest-remediation-project) [**{count-facebook}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-twitter}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-linkedin}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**](https://www.jfbrennan.com/blog/topic/habitat-restoration#) [![Brennan water tanks and treatment](https://www.jfbrennan.com/hubfs/Kalamazoo%20water%20sampling%201.jpg) ](https://www.jfbrennan.com/blog/what-are-pfas) ## [What Are PFAS and Why Do You Need To Know?](https://www.jfbrennan.com/blog/what-are-pfas) Posted by [Connor McNeely, Chemist](https://www.jfbrennan.com/blog/author/connor-mcneely-chemist) on November 12, 2025 PFAS, often called “forever chemicals,” are at the center of one of today’s most complex environmental challenges. Used for decades in everything from manufacturing processes to firefighting foam applications, these persistent compounds are now found in soil, sediment, and waterways across the country. As research and regulations evolve, organizations are seeking trusted partners who can safely and effectively address contamination. We'll explain PFAS, associated risks, and how Brennan is prepared with the expertise, technology, and experience needed to protect our shared environment. [Read More](https://www.jfbrennan.com/blog/what-are-pfas) [**{count-facebook}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-twitter}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-linkedin}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**](https://www.jfbrennan.com/blog/topic/habitat-restoration#) [![Hydro dam photo of Brennan's finished formwork](https://www.jfbrennan.com/hubfs/2025%20PSE%20Upper%20Baker%20-%20a\)%20Completed%20Concrete%20Form-104.jpg) ](https://www.jfbrennan.com/blog/spillway-stabilization-upper-baker-hydro-dam-repairs) ## [Spillway Stabilization at Upper Baker Dam: Overcoming Challenges in Hydro Dam Repairs](https://www.jfbrennan.com/blog/spillway-stabilization-upper-baker-hydro-dam-repairs) Posted by [David Laack](https://www.jfbrennan.com/blog/author/david-laack) on October 08, 2025 ### Identifying Spillway Failure Risks and Project Background The Upper Baker Dam Spillway Stabilization project addressed potential failure modes in the dam’s spillway chute’s foundation, identified during a 2019 Federal Energy Regulatory Commission (FERC) Part 12D dam safety workshop. After extensive analysis, design, and consultation with FERC, the project came to fruition. [Read More](https://www.jfbrennan.com/blog/spillway-stabilization-upper-baker-hydro-dam-repairs) [**{count-facebook}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-twitter}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-linkedin}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**](https://www.jfbrennan.com/blog/topic/habitat-restoration#) [![](https://www.jfbrennan.com/hubfs/Featured-USACE-Lake%20George-Ribbon%20Cutting.jpg) ](https://www.jfbrennan.com/blog/remediation-restoration-video-lake-george) ## [How Brennan Brought Lake George Canal Back to Life! [with video]](https://www.jfbrennan.com/blog/remediation-restoration-video-lake-george) Posted by [Sam Crawford, Project Manager](https://www.jfbrennan.com/blog/author/sam-crawford-project-manager) on July 29, 2024 Brennan embarked on a vital restoration project for the middle section of the Lake George Canal. The primary goal was to protect aquatic organisms by separating them from contaminated sediment through a multi-layer sediment cap. ## Initial Site Challenges Hydrographic surveys revealed areas of varying slope and stability as the first layer of cap material was placed over the canal bottom. These issues were attributed to soft underlying sediment within the canal footprint. The success of this project hinged on effective collaboration between Brennan and the U.S. Army Corps of Engineers (USACE) to address these types of challenges. [Read More](https://www.jfbrennan.com/blog/remediation-restoration-video-lake-george) [**{count-facebook}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-twitter}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-linkedin}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**](https://www.jfbrennan.com/blog/topic/habitat-restoration#) [![Treatability testing at Brennan](https://www.jfbrennan.com/hubfs/Clarification%20Test-139.jpg) ](https://www.jfbrennan.com/blog/treatability-testing) ## [What Is Treatability: An Important Asset in Environmental Dredging](https://www.jfbrennan.com/blog/treatability-testing) Posted by [Amber Wilson](https://www.jfbrennan.com/blog/author/amber-wilson) on February 29, 2024 Treatability testing uses bench-scale demonstrations and analysis to determine if a material can be effectively treated with a specific chemical or process. At Brennan, we use treatability testing to develop sound technical approaches for dredged material dewatering, in situ or dewatered dredged material stabilization, and water treatment.  [Treatability](https://www.jfbrennan.com/environmental/treatability) data can be used to price a job more accurately and find cost savings for our clients. Treatability testing allows us to select chemical and mechanical processes for treatment and evaluate less costly alternatives. Here's how we do it. [Read More](https://www.jfbrennan.com/blog/treatability-testing) [**{count-facebook}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-twitter}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-linkedin}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**](https://www.jfbrennan.com/blog/topic/habitat-restoration#) [![Photo of Island Building at Pigs Eye Lake](https://www.jfbrennan.com/hubfs/2023%20Pigs%20Eye%20Lake%20-%20St.%20Paul%2c%20MN-101_medium.jpg) ](https://www.jfbrennan.com/blog/island-building-habitat-restoration-pigs-eye) ## [Island Building and Habitat Restoration: Utilizing Dredged Material for Environmental Benefits](https://www.jfbrennan.com/blog/island-building-habitat-restoration-pigs-eye) Posted by [Kimberly Walters](https://www.jfbrennan.com/blog/author/kimberly-walters) on October 19, 2023 Island building and habitat restoration have significant environmental benefits, improving aquatic and land-based ecosystems. Working under LS Marine alongside Ramsey County, the U.S. Army Corps of Engineers, Saint Paul District, and the Minnesota Department of Natural Resources, Brennan built up islands at Pigs Eye Lake in Saint Paul, Minnesota. The project's master plan features seven islands, sand beaches, marsh habitat, and land plantings. We utilized dredged material from the Mississippi River in an environmentally beneficial way to build the islands. Here's how it happened and why it works! [Read More](https://www.jfbrennan.com/blog/island-building-habitat-restoration-pigs-eye) [**{count-facebook}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-twitter}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-linkedin}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**](https://www.jfbrennan.com/blog/topic/habitat-restoration#) [![Photo of Ponds Behind Erie Pier](https://www.jfbrennan.com/hubfs/Still%20Duluth%20Ponds%20behind%20eries%20pier.jpg) ](https://www.jfbrennan.com/blog/sediment-remediation-erie-pier-aoc) ## [Remediating Sediment Contaminated With PCBs, PAHs, Mercury, Chromium: A Successful Clean-up Story](https://www.jfbrennan.com/blog/sediment-remediation-erie-pier-aoc) Posted by [Kimberly Walters](https://www.jfbrennan.com/blog/author/kimberly-walters) on October 12, 2023 The US Environmental Protection Agency ([EPA](https://www.epa.gov/)) and Minnesota Pollution Control Agency ([MPCA](https://www.pca.state.mn.us/)) signed a project agreement to remediate contaminated sediment in the “ponds behind Erie Pier,” two ponds surrounded by shallow marsh wetlands in the St. Louis River Area of Concern ([AOC](https://www.epa.gov/great-lakes-aocs/st-louis-river-aoc#:~:text=Overview-,The%20St.,second%20largest%20U.S.%2Dbased%20AOC.)). The sediment was primarily contaminated with PCBs, PAHs, mercury, and chromium. Here's how we worked with stakeholders to clean up the sediment and the resulting impact of our work. [Read More](https://www.jfbrennan.com/blog/sediment-remediation-erie-pier-aoc) [**{count-facebook}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-twitter}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-linkedin}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**](https://www.jfbrennan.com/blog/topic/habitat-restoration#) [![geotextile tubes and water treatment ](https://www.jfbrennan.com/hubfs/diver%20assisted%20dredging%20-%20Cuyahoga%202.jpg) ](https://www.jfbrennan.com/blog/diver-dredging-capping-cuyahoga) ## [Diver-Assisted Dredging and Capping Used in the Cuyahoga River Improvement Project](https://www.jfbrennan.com/blog/diver-dredging-capping-cuyahoga) Posted by [Kimberly Walters](https://www.jfbrennan.com/blog/author/kimberly-walters) on June 15, 2023 The Cuyahoga Improvement Project in Kent, OH, aims to improve future recreation experiences while protecting existing natural resources. The purpose of our work is to remove areas of petroleum-impacted soft sediments that were deposited decades ago from discontinued industrial practices upstream.  ### **Background on a Burning River** The Cuyahoga River has quite a history: a transportation route; a boundary; an origin for oil, rubber, and steel industries; a power source; and a dumping ground. The river was once 1 of the most polluted in the country. The Cuyahoga has caught fire at least 13 times since the 1860s. [Read More](https://www.jfbrennan.com/blog/diver-dredging-capping-cuyahoga) [**{count-facebook}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-twitter}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-linkedin}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**](https://www.jfbrennan.com/blog/topic/habitat-restoration#) [![geotextile tubes and water treatment ](https://www.jfbrennan.com/hubfs/IAI%20Geotextiles%20Water%20Treatment.jpg) ](https://www.jfbrennan.com/blog/iai-acquisition-2023) ## [Brennan Acquires Dredging & Dewatering Division](https://www.jfbrennan.com/blog/iai-acquisition-2023) Posted by [Kimberly Walters](https://www.jfbrennan.com/blog/author/kimberly-walters) on February 07, 2023 February 6, 2023 — Specialty marine contractor J.F. Brennan Company, Inc. ([Brennan](https://www.jfbrennan.com/)) recently finalized the asset acquisition of the dredging and dewatering division of Infrastructure Alternatives, Inc. ([IAI](https://iaiwater.com/)). The purchase brings dewatering, water treatment, and treatability testing services into the organization for the first time. [Read More](https://www.jfbrennan.com/blog/iai-acquisition-2023) [**{count-facebook}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-twitter}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-linkedin}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**](https://www.jfbrennan.com/blog/topic/habitat-restoration#) [![J.F. Brennan Company amphibious SHERP ATV on a wetland remediation project](https://www.jfbrennan.com/hubfs/Brennan-ATV-Environmental-Work.jpg) ](https://www.jfbrennan.com/blog/top-contractor-america-2022) ## [Brennan Makes List of Top Contractors in America, 5 in Hazardous Waste](https://www.jfbrennan.com/blog/top-contractor-america-2022) Posted by [Kimberly Walters](https://www.jfbrennan.com/blog/author/kimberly-walters) on June 15, 2022 LA CROSSE, Wis., June 14, 2022 ― Engineering News-Record ([ENR](https://www.enr.com/aboutus)) published its annual ranking of the largest U.S.-based general contractors, with specialty contractor J.F. Brennan Company (Brennan) making the list with an overall ranking of 351. Brennan is listed as the 5th largest contractor in the hazardous waste sector. The demand for Brennan’s environmental remediation services has increased year over year on a national scale. Landing at the 5th spot among all hazardous waste contractors, Brennan is in an echelon of its own, as all its projects take place on, under, or alongside bodies of water. [Read More](https://www.jfbrennan.com/blog/top-contractor-america-2022) [**{count-facebook}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-twitter}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**{count-linkedin}](https://www.jfbrennan.com/blog/topic/habitat-restoration#)[**](https://www.jfbrennan.com/blog/topic/habitat-restoration#) [All posts](https://www.jfbrennan.com/blog/all) [Older Posts ![](https://www.jfbrennan.com/hubfs/images/pagination-right.png)](https://www.jfbrennan.com/blog/topic/habitat-restoration/page/2) ### Subscribe Here! ### Latest Blog Posts ### Posts by Topic - [Marine Construction (70)](https://www.jfbrennan.com/blog/topic/marine-construction) - [Corporate Culture (53)](https://www.jfbrennan.com/blog/topic/corporate-culture) - [Employee Engagement (50)](https://www.jfbrennan.com/blog/topic/employee-engagement) - [Great Place to Work (44)](https://www.jfbrennan.com/blog/topic/great-place-to-work) - [Environmental Dredging (41)](https://www.jfbrennan.com/blog/topic/environmental-dredging) - [J.F. 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