Project snapshot highlights:

  • Nitra-Seal Protects Indoor Air Quality at Retail Center
  • Petroleum Hydrocarbons Abated
  • 10,000 Square Feet Installed

The project is a commercial retail center in St. Louis, and part of a larger, decade-long redevelopment project. A nearby, historical fuel spill resulted in petroleum hydrocarbon compounds, including benzene, ethylbenzene, and naphthalene, being detected at concentrations exceeding Missouri’s Risk-Based Corrective Action indoor air screening levels. Consequently, the soil gas was considered a vapor intrusion risk to future building occupants and required a vapor mitigation solution. The engineering consultant selected Nitra-Seal® with a TerraVent™ low-profile, passive venting system to address the risk. Selection factors included its ease of installation and superior chemical resistance offered by Nitra-Seal’s spray-applied, nitrile-advanced asphalt latex. Land Science teamed with the engineering consultant in the design process by developing the venting layout and vapor barrier system’s specifications. Additionally, the environmental consultant, a Land Science Certified Inspector, provided oversight on the installation and documented compliance with the project specifications per the development team’s request.