Preliminary Design Investigations and Remedial Designs for LNAPL and Groundwater Remediation System

The site has a rich history of former paint manufacturing operations, causing it to be impacted by inorganic and organic compounds. EHS Support conducted comprehensive LNAPL mobility evaluations, natural source zone depletion (NSZD), and enhanced bioremediation studies at the site. As a result, enhanced bioremediation was chosen as the primary remediation method to address deep saturated zone impacts. This remediation effort is part of a broader plan encompassing multiple remediation programs being conducted at the site and its surrounding streams and lakes.

The Remedial Design incorporates a batch mode bio-stimulant injection approach combined with methane gas capture across the former industrial site and peripheral areas, including roads and adjacent commercial/residential sites. Complexities of the design include development of a flexible system to enable use of adaptive management remedial approaches, integration of infrastructure around services and utilities, and management of aesthetics and nuisance for neighboring properties.

Key elements of this project included:

  1. NSZD Depletion Studies and Biogeochemical assessments.
  2. Enhanced Bioremediation Bench-scale studies
  3. Use of nitrate and sulfate-based stimulants for enhanced biodegradation
  4. Design of subsurface injection and methane capture systems
  5. Focused LNAPL recovery
  6. Permitting and approvals of remedial system components
  7. Procurement and Construction Oversight

At this time, the Preliminary (30%) Remedial Design has been submitted to USEPA. The 90% Remedial Design is in progress and will likely be submitted to USEPA in the Summer of 2024, with Remedial Action construction in beginning in 2025.

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