The Allied Leather Tannery Complex Site has a long history of industrial use dating back to the mid-1800s, including long-time use as a textile mill up until the 1940s. Later, the site operated as a leather tannery up until the mid-1980s. These former site uses resulted in soil and groundwater contamination of various hazardous substances, including volatile and semi-volatile organic compounds, petroleum hydrocarbons, and chromium. Leather scrap (aka tannery waste) also still remains at the site. Loureiro was selected by the City of Concord as the environmental consultant to provide engineering services in support of final cleanup of the Site.
Loureiro’s environmental experts worked with the City to develop the best site cleanup approach, with consideration for the City’s redevelopment vision of a mixed-use commercial building and a riverfront park on the eastern and western portions of the site. Loureiro’s cleanup approach involved the on-site reuse of approximately 6,000 cubic yards of coal-ash impacted soils and 8,500 cubic yards of crushed masonry along with the characterization, management, and off-site disposal of 1,100 cubic yards of contaminated concrete, 1,000 cubic yards of chromium-impacted, and 750 cubic yards of petroleum-impacted subsurface soils. The cleanup involved substantial filling and grading of the site, utilizing as much of existing materials as possible, while facing geotechnical challenges related to soil reuse, as well as permitting related to alteration of terrain (AOT) and shoreland protection. Final cleanup was performed in conjunction with NHDES and EPA Region I under a $600,000 cleanup grant for hazardous substances received from the EPA Brownfields Program. The project took about two and a half years from start to finish. Loureiro Engineering, Loureiro Contractors, Inc. and WorkWaste worked together to complete the project.
We provided engineering and construction management to close out the site so the city could move forward with future developments to improve the community and convert this property for a more economic use. A city park will take up a portion of the restored space, providing a clean, outdoor resource for community enjoyment.