We were hired by a local developer to help navigate the complex environmental issues that were preventing the sale and redevelopment of the Mohawk Tannery property by developing a holistic approach for remediating the two abutting impacted sites (Fimbel Landfill and Broad Street Parkway Asbestos Cell) concurrently.


AWARDED $65,000 IN BROWNFIELDS GRANT – Prepared a successful Brownfields grant application.  Project was awarded over $65,000 from the New Hampshire Department of Environmental Services (NHDES).

IDENTIFIED ALTERNATIVE COST SAVING REMEDIAL SOLUTION.  Due to mounting costs for implementing a solidification/stabilization (S/S) remedial option,  Verdantasdeveloped an alternative plan for the use of a slurry wall to surround and encapsulate the tannery sludge and install  an engineered cap system to cover over the waste enclosure.

INTEGRATED VARIOUS STATE AND FEDERAL REGULATORY PROGRAMS – Verdantas navigated federal CERCLA/Superfund regulations (for Mohawk Tannery), NHDES Solid Waste and Site Remediation rules (for Fimbel Landfill), and NHDES Asbestos Disposal Site (ADS) rules (for the Broad Street Parkway Asbestos Cell) to develop a viable cleanup alternative for the three properties – effectively creating a combined 40-acre redevelopment site with tannery sludge and asbestos waste re-located and consolidated into a 4-acre containment cell.

Scope of Services

  • Brownfields grant proposal preparation
  • Stakeholder engagement (developer, municipality, various state regulators)
  • Federal regulatory agency coordination
  • ASTM/AAI Phase I ESA
  • CERCLA cleanup planning
  • In-situ S/S bench-scale treatability study
  • ADS Work Plan
  • Remedial Design Plans

Project Details

2016: Verdantas evaluated an alternative remedial approach – The use of steel sheet piles or a slurry wall
to surround and encapsulate the tannery sludge and installation of a robust cap system to cover over the enclosure was determined to be a more cost-effective remedial option over S/S.

2017: USEPA “Prioritized” the site for closer oversight by USEPA to fast-track remedial cleanup approvals and facilitate planned redevelopment.

2019: Verdantas prepared 80% Remedial Design Plans for integrated site-wide remediation and
residential redevelopment.

2020: Developer and USEPA execute settlement agreement and Verdantas prepares 100% Remedial
Design Plans.

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