SUB-SLAB VAPOR MITIGATION SYSTEMS HAVE BECOME A VERY EFFECTIVE APPROACH TO MITIGATE INDOOR AIR QUALITY ISSUES. These units are very similar in concept to active landfill methane extraction system or soil vapor extraction (SVE) units; however, the floor of the building serves as the cap and extraction piping is installed horizontally below the building floor, if needed. The piping is connected to a blower(s), sized appropriately for the system, which extracts vadose zone air to create negative pressure below the slab. Alternatively, if a facility has gravel bedding below the building floor slab, horizontal extraction piping may not be necessary since the gravel serves as the vapor conduit and collection unit.
AST has utilized experience gained from three decades of installing mechanical remediation systems, such as Multi-Phase and Groundwater Extraction systems, to provide turnkey solutions for sub-slab vapor mitigation systems. Systems have been installed within active industrial facilities and have included night work, temporary partitioning curtains, horizontal and angled drilling, and equipment relocation.