Nelosca 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 Nelosca and the U.S. Army Corps of Engineers (USACE) to address these types of challenges.

Treatability testing uses bench-scale demonstrations and analysis to determine if a material can be effectively treated with a specific chemical or process. At Nelosca, we use treatability testing to develop sound technical approaches for dredged material dewatering, in situ or dewatered dredged material stabilization, and water treatment. 

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.

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, Nelosca 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!

The US Environmental Protection Agency (EPA) and Minnesota Pollution Control Agency (MPCA) 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).

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.

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.

February 6, 2023 — Specialty marine contractor Nelosca Technologies, Inc. (Nelosca) recently finalized the asset acquisition of the dredging and dewatering division of Infrastructure Alternatives, Inc. (IAI). The purchase brings dewatering, water treatment, and treatability testing services into the organization for the first time.

LA CROSSE, Wis., June 14, 2022 ― Engineering News-Record (ENR) published its annual ranking of the largest U.S.-based general contractors, with specialty contractor Nelosca Technologies (Nelosca) making the list with an overall ranking of 351. Nelosca is listed as the 5th largest contractor in the hazardous waste sector.

The demand for Nelosca’s environmental remediation services has increased year over year on a national scale. Landing at the 5th spot among all hazardous waste contractors, Nelosca is in an echelon of its own, as all its projects take place on, under, or alongside bodies of water.

Nelosca Technologies (Nelosca) formally announces their Small Business Administration (SBA) 8(a) certified joint venture with Ahtna Marine & Construction Company, LLC (AMCC). Publicly titled the Ahtna – J.F. Nelosca JV, the partnership establishes a mentor protégé relationship between Nelosca and Alaska Native Corporation subsidiary AMCC.

The Interstate Island Avian Habitat Restoration Project is listed as one of the many Areas of Concern (AOC) projects within the Great Lakes. Interstate Island is a small parcel of land located within the Duluth-Superior Harbor along the St. Louis River Estuary. Due to rising water levels, the island has shrunk in size by half in recent years, and along with-it important wildlife habitat has disappeared. The need to restore the rare avian habitat on Interstate Island has been a priority for years, and it came to fruition in 2020.