Terra-Petra has completed the vapor intrusion mitigation system design for a new development in San Francisco and is now performing inspections during the installation of the system. The development is comprised of an 18 Story High-Rise, with 1 Level below grade, a basement slab, and with a building footprint of 20,080 SF.

Our standard inspection process for a project like this includes:

  • Document review prior to site visit
  • Jobsite kickoff meeting,
  • Pre-installation field inspection
  • Substrate preparation field inspection
  • Application observation field inspection
  • Testing field inspection
  • Final approval

More about Terra-Petra’s vapor intrusion mitigation system design services:

Vapor Intrusion refers to the migration of Soil Gas Vapors emanating from the earth into an occupied space or structure. The particular vapors of concern are volatile organic compounds (VOCs), including chlorinated solvents, petroleum hydrocarbons, methane, hydrogen sulfide and semi volatile organic compounds (SVOCs) to name a few. Terra-Petra can prevent these vapors from intruding into your structure.

Some governing agencies will require any new structure built on a contaminated site to protect the occupants from potential soil vapor intrusion with a Subslab Building Protection System, while some developers elect to do so voluntarily because of a potential human health risk down the road. Regardless of the reason, Terra-Petra can design a system for you. We routinely design these passive and active Building Protection Systems across numerous cities and counties governed by many different agencies.

A typical Building Protection Systems consists of an impermeable soil vapor membrane and a pressure relief system. Where deemed appropriate, Terra-Petra can design mechanical vapor extraction systems, electronic gas detection and alarm systems; employing the latest technologies.