Future Grand Traverse Greenway Trail Environmental Assessment -Phase I & II ESA
Scope of Work :
ETC provided environmental due diligence services for a commercial warehouse property in Romulus, Michigan to evaluate potential methane vapor intrusion concerns identified during redevelopment planning.
The property has a documented industrial use history, including aboveground and underground storage tanks and subsurface sump features. ETC was engaged to determine the source and extent of methane vapors beneath the building slab and to support environmental risk management for the new property owner.
ETC's Role :
ETC conducted a Phase II Environmental Site Assessment (ESA) focused on identifying and delineating potential methane vapor intrusion pathways beneath the concrete slab of the warehouse.
The investigation included geophysical surveying using Ground Penetrating Radar (GPR) to locate potential subsurface anomalies and sources of vapor migration. Soil sampling was completed using hand auger drilling methods, with sampling depths ranging from approximately 15 to 25 feet below grade in both interior and exterior locations, in accordance with Michigan Part 201 sampling strategies.
The GPR survey extended to depths of approximately 11 feet below grade and identified limited anomalies, with no evidence of buried debris, former septic systems, or significant subsurface disturbance. Field data indicated that elevated methane levels were associated with high groundwater conditions and runoff infiltration beneath the slab, rather than discrete subsurface structures.
Results and Impact :
Based on the results of the GPR survey and subsurface sampling, ETC identified conditions consistent with groundwater inundation beneath the building slab contributing to methane vapor presence. The findings allowed the property to be formally evaluated as a facility under applicable state criteria.
ETC completed a Baseline Environmental Assessment (BEA) for the site, providing liability protection for the new owner and supporting informed decision-making regarding future property use and management.
This investigation provided the client with clear, defensible documentation of subsurface conditions and potential vapor pathways, reducing uncertainty and supporting responsible redevelopment planning.
This project marked ETC’s first engagement with Nomad Towers Services. The assessment established a foundation for future collaboration by delivering thorough environmental evaluation and regulatory-compliant documentation tailored to the client’s operational needs.
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