Mount Clemens Clinton Place Vapor Mitigation System

ASTI completed methane testing, sub-slab Pressure Field Extension (PFE) testing, and Sub-Slab Depressurization (SSD) system design for the Subject Property. Methane monitors were in use in 94 first-floor residential units to evaluate potential methane migration from the former Mt. Clemens Landfill. In accordance with EGLE requirements, ASTI conducted methane screening using a landfill gas analyzer (LGA) within residential units selected by the client and compared results to monitor performance.

ASTI performed PFE testing at multiple locations across the residential buildings to evaluate vacuum distribution beneath the slab. Temporary fan systems and vacuum monitoring points were installed to determine the radius of influence. Results were used to establish vapor extraction point spacing necessary to meet EGLE’s minimum vacuum requirements.

Following the field investigations, ASTI prepared SSD system plans and specifications, including piping layouts, venting design, and foundation penetration details. Revisions were completed to address EGLE comments. ASTI coordinated with the project architect to finalize riser locations and horizontal collection system design.

Project challenges included conducting testing in occupied residential units and limited building documentation due to the age of the development. These constraints were addressed through strategic scheduling and field verification of existing system components.