Chicago Fieldhouse Geo-Seal
Geo‐Seal, a triple‐layer, composite vapor intrusion barrier was installed to protect the users of the fieldhouse from potential exposure to chlorinated solvent vapors.

Project Highlights

  • Geo‐Seal® selected over other vapor barrier options due to its superior chemical resistance, ease of constructibility and cost‐effectiveness
  • Approximately 16,000 square feet of Geo‐Seal successfully installed
  • Vapor‐Vent HD trenchless passive ventilation system utilized to alleviate buildup of vapors beneath the structure
  • Site achieves LEED “Silver” Certification for green construction technology on historic site

Project Summary

A new fieldhouse utilizing the latest in green technology was constructed by the Public Building Commission (PBC) in the city of Chicago, IL. The development incorporated various sustainable design elements and materials to achieve the Commission’s goal of LEED “Silver” Certification. Past use of an adjacent property resulted in chlorinated solvent contamination which presented a vapor intrusion risk on‐site.

Fieldhouse ChicagoGeo‐Seal, a triple‐layer, composite vapor intrusion barrier was installed to protect the users of the fieldhouse from potential exposure to chlorinated solvent vapors. The Geo‐Seal technology was chosen by PBC’s consultants, Parson Corporation and Carnow Cornibear & Associates, based on an evaluation of various gas membrane technologies, including a simple spray‐applied asphalt latex membrane and HDPE sheeting. The Geo‐Seal system was designed and inspected by Terracon Consultants.

Technology Description

Geo-Seal® is a gas vapor management technology designed to eliminate vapor intrusion on Brownfields or any type of environmentally-impaired site. Geo-Seal is a chemically-resistant material placed between the foundation of the building and the soil pad to eliminate vapor intrusion pathways and stop contaminant vapors from permeating through the slab. By deploying Geo-Seal, developers can ensure a healthy indoor environment while reducing the cost of site remediation and expediting site construction.

Vapor‐Vent is a low profile vent system that can be used in lieu of slotted PVC pipe. The speed of installation and the proximity of the vent to the barrier provide cost savings and performance benefits compared to other technologies. Vapor‐Vent can be installed to passively or actively vent vapors from under the building. The movement toward energy efficient buildings and the cost to maintain active venting systems make passive systems an attractive alternative. In addition, a passive system can be converted to active if needed.

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