Retro-Coat Utilized to Prevent Harmful TCE and Chloroform Vapor Intrusion
Case study highlights:
- The Retro-Coat barrier and Vapor-Vent system were incorporated into already planned renovations, saving the site owner time and money.
- Retro-Coat is resistant to both TCE and chloroform and is a wearing surface, rated for foot and forklift traffic.
- The Retro-Coat system layers cure quickly, reducing building downtime.
- The combination of Retro-Coat and Vapor-Vent was chosen as a remedial solution to mitigate the risk of harmful vapor intrusion.
This case study reviews a former industrial manufacturing facility in Greenville, SC that was purchased under a Voluntary Cleanup Contract and Brownfields agreement with the South Carolina Department of Health and Environmental Control (SCDHEC). Prior to renovation of the property, it was estimated that two VOCs, chloroform and TCE, had indoor air concentrations above EPA Industrial/Commercial Risk Based Screening Levels (RSL). Environmental consulting firm Bunnell Lammons Engineering recommended the installation of Retro‑Coat®, a vapor intrusion mitigation coating system, in conjunction with a passive sub-slab depressurization system (SSDS) comprised of Vapor‑Vent to protect the structure from vapor intrusion.
Retro-Coat Applied to Former Jazz Club Ensures Protection from Vapor Intrusion
Case study highlights:
- How Maul Foster Alongi achieved 33% cost savings compared to alternative remedial approaches
- Indoor air quality evaluation of TCE and other VOCs
- Retro-Coat application details
- Vapor mitigation performance results and indoor air quality findings after the installation of Retro-Coat
Subsurface contamination caused by chlorinated volatile organic compounds (CVOCs) beneath a former jazz club posed a direct risk to the indoor air quality for a Renton, Washington property. The CVOCs had migrated beneath the property from a neighboring dry cleaning operation resulting in a vapor intrusion (VI) issue. When environmental consultant Maul Foster Alongi performed a cost analysis of different vapor mitigation and remediation approaches, it was found that the Retro Coat™ Vapor Intrusion Coating System would provide an excellent solution at about a third of the cost less than other remedial approaches.
Retro-Coat Helps Speed Real Estate Transaction
Case study highlights:
- Retro-Coat functioned as a vapor intrusion mitigation membrane as well as a long-lasting coating for the basement level
- Retro-Coat was chosen as the most feasible and effective treatment due to compatibility with pre-existing methane mitigation system components
- Retro-Coat is resistant to harmful methane gas intrusion and is a wearing surface, meaning no additional concrete protection is necessary
- The updated vapor intrusion mitigation system allowed for the new tenants to move in quickly
An office building located on the San Francisco Peninsula is located on top of a capped landfill which is a known methane producer. After a recent change in ownership, it was important for the new owner to update the vapor mitigation system to ensure the tenant’s safety from any harmful vapor intrusion. Engineering and consulting firm Langan proposed using Retro-Coat Vapor Intrusion Coating System because of its proven resistance to harmful vapors and its durability. The owner was thoroughly pleased with this application because it accomplished two goals with a single product: it mitigated the harmful vapor intrusion and provided a durable coating for the floor of the basement level. Retro-Coat’s multi-functionality saved the site owner time and money.
Advanced Remedial Technologies Restore Neighborhood
Case study highlights:
- Application of combined REGENESIS technologies to biodegrade contaminants, prevent further plume migration, and protect occupants from the threat of vapor intrusion.
- Reduction of the total cVOC plume extent by 95% and reduced mass by 99.8%.
- Positive results indicating the degradation process is ongoing and processing.
This case study reviews a former plating facility in southwest Michigan that had released chlorinated volatile organic compounds (cVOCs) into shallow groundwater, resulting in a ¼-mile long contaminant plume. In response, the Michigan Department of Environmental Quality (MDEQ) and the environmental firm, DLZ, implemented a combined remedy which included mitigating vapor intrusion in the residential basements and treating the groundwater plume with a novel, multi-phase in situ bioremediation approach.