EHS Support was retained to address the historical sources of organic contamination at a multi-use commercial site, which would allow the owner and key stakeholders to achieve site closure and enable site reuse within an expedited timeframe.

Site Complexity:

  • Existing 80,000 sf structure, located near a water body
  • Geology comprised of heterogeneous fill material overlying lower permeability, low density, and low strength clays
  • Shallow saline groundwater
  • VOC mass estimate: ~10-30 tons, predominantly as chlorinated solvent DNAPL
  • Majority of mass located at or below the fill/clay contact (20-55 ft bgs) and beneath the structure (a treatment area of ~25,000 sf)
  • Multiple stakeholderS

Project Overview

Based on the remediation goals and stakeholder needs, thermal remediation was identified as the only viable remedy.

Prior to implementation, a risk assessment was conducted as part of the feasibility study in order to determine the implementability and effectiveness of thermal remediation. Critical design questions included:

  • Implementability: Can thermal remedy be completed within existing building without permanent adverse effects to building?
  • Effectiveness: Will thermal remedy be able to achieve remediation goals given implementability constraints?

Findings from the risk assessment were used to mitigate potential impacts through the remedial design process and develop a risk management plan for potential impacts that could not be avoided through design. The plan focused on monitoring temperatures and movement of various structural building elements before, during, and after remediation and adjusting operations as needed to ensure that the feasibility study criteria could be satisfied. The project is in active remediation with post-remediation monitoring and closure in 2025.


Stakeholder engagement and collaboration in conjunction with technical expertise have been critical to the cleanup at this complex site, especially during the remedy selection and remedy design process.

See more of our project experience.