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Energizer Battery Manufacturing, Inc. operated a battery and flashlight manufacturing facility in St. Albans, Vermont from 1947 until 2013. Manufacturing processes utilized bulk quantities of the chlorinated solvent trichloroethylene (TCE), primarily for degreasing and parts cleaning. Storage and use practices at the facility resulted in releases of TCE to building materials and the subsurface. Stone was retained by Energizer’s primary environmental consultant, Environmental Resource Management (ERM), as a specialty contractor to perform vapor intrusion and indoor air assessments at the site to support remedial design of a vapor intrusion mitigation system. Stone utilized fixed-based laboratory analysis and a field portable gas chromatograph/mass spectrometer (GC/MS) for on-site analysis of sub-slab soil gas, indoor air, and mass flux samples to identify vapor intrusion pathways and determine whether the building slab could serve as a long-term indoor air contaminant source. Sampling was conducted under varying heating, ventilation, and air conditioning (HVAC) operational settings to determine optimal HVAC settings to support vapor intrusion mitigation. Stone performed indoor air sampling and remedial system performance monitoring following the installation of six sub-slab depressurization systems.