Case Study
PFAS Multiphase Soil Capping Project
By James L’Esperance, P.E., Consultant
Michael J. Martin, P.E., Senior Engineering Advisor, Technical Director, Engineering
OUR CHALLENGE
Per- and polyfluoroalkyl substances (PFAS) were found at high concentrations in surface soils at an active chemical manufacturing plant, posing a direct contact risk to the plant workers and creating a potential migration-to-groundwater pathway. Our client sought to develop a remedial measure to address PFAS in soil while minimizing the impact on facility operations to the furthest extent possible.
OUR APPROACH
We designed a 1.2-acre low-permeability cap composed of asphalt, concrete, and gravel segments to prevent stormwater infiltration through the soils. We developed a multiphase installation plan to seamlessly conduct construction activities during regularly scheduled plant shutdowns. Our team then oversaw the bidding, construction, and reporting to the regulatory agency.
OUR IMPACT
The soil cap has remained protective for both direct contact and migration to groundwater pathways since construction was completed. The client was pleased that construction did not significantly affect facility operations, and the remedial measure met all operational and environmental requirements.
Published
December 15, 2023
Key Contact
Mr. James L’Esperance is a licensed professional engineer with more than 12 years of experience in project management, environmental remediation,... Full bio
Key Contact
Mr. Mike Martin is a registered professional engineer with 22 years of experience in civil and environmental engineering. Mr. Martin... Full bio