EGLE/State of Michigan Department of Technology, Management and Budget | Former Sparta Cleaners Vapor Intrusion Mitigation

Environmental investigations identified volatile organic compounds (VOCs) in soil, groundwater, and soil gas at concentrations exceeding regulatory thresholds, posing an indoor air inhalation risk at a historic dry-cleaning facility in Sparta. The source property owner installed a vapor mitigation system (VMS) in the former dry-cleaning building, but subsequent investigations by EGLE detected VOCs in soil gas beneath two adjacent commercial properties.
Fishbeck was retained by EGLE to assess contamination, delineate the extent of VOC impacts, and design, install, and commission a VMS for each of the affected adjacent buildings:
Dance Studio Building (5,200 sf slab-on-grade)
• Three suction points connected to a single vent stack
• OBAR GBR-89 HA compact radial blower
• Remote Telemetry Monitoring System (RTMS) for real-time monitoring
• Seal accessible leakage points and sub-slab pressure monitoring
Commercial Building (4,150 sf mitigated portion, slab-on-grade with partial basement)
• Five suction points connected to a single vent stack
• OBAR GBR-123 UD compact radial blower
• RTMS for real-time monitoring
• Seal accessible leakage points and monitor sub-slab pressure
• Additional basement mitigation efforts, including seepage prevention, sub-slab/subwall
depressurization/ventilation, and vapor-resistant coatings
Fishbeck is conducting quarterly onsite inspections and continuously monitoring system operations via RTMS. The project will remain under evaluation, with ongoing basement mitigation efforts in the commercial building.