The project site was formerly operated as Bridgeport Metal Goods, a manufacturer of stamped metal products, metal battery casings, metal flashlights, lanterns, and cosmetic packaging from circa 1919 through 1999. During this period, chlorinated volatile organic compounds (CVOCs) including trichloroethene (TCE), tetrachloroethene (PCE), and 1,1,1-trichloroethane (TCA) were historically utilized by the former site tenant, for chemical stripping and degreasing operations. Releases from the prior use have results in soil, groundwater, soil vapor, and indoor air impacts at the current site building. Partner ESI was engaged by the client for Site Characterization and Vapor Intrusion mitigation services.
Based on elevated concentrations of CVOCs present throughout the site, an active vapor intrusion mitigation system (VIMS) is required to address vapor intrusion impacts and reduce or eliminate soil vapor intrusion into the building’s breathing space.
The facility is made up of nine separate yet connected buildings and there are multiple source areas throughout the buildings. Therefore, diagnostic testing, design, and installation of six VIMS throughout these buildings had to be tailored to the distinctive construction features in each building.
Indoor air samples collected at the site detected chlorinated volatile organic compounds (CVOCs) at concentrations exceeding the CTDEEP indoor air standards within the breathing space of the building. To remediate the indoor air, Partner installed the Sub-Slab Depressurization System (SSDS) / VIMS, which includes 27 extraction points, tied into approximately 1,500 linear feet of piping, and 6 blowers / alarms. Partner’s team onsite is self-performing the installation of the extraction points, piping, blowers, and alarms. One challenge is installing the extraction points, piping, alarms, and blowers in locations that maximum the remedial effect (sub-slab depressurization in contaminant source areas), but not interfering with the operations of the U-Haul storage facility.
Client Benefits
The installation of the VIMS onsite will reduce or eliminate soil vapor intrusion to the indoor air of the building and ensure that the tenants and customers of the onsite U-Haul Facility are not exposed to hazardous chemicals.
