Skip to main content

VAPOR EXTRACTION SYSTEMS: AIR QUALITY ANALYSIS FOR A SUB-SLAB VENTILATION SYSTEM

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

A recent environmental study was performed to evaluate the potential for vapor migration of volatile organic compounds (VOCs) from soil contaminated with manufactured gas plant (MGP) waste locateddirectly underneath a building at a retail shopping center in New York. Air sampling for potentialVOCs had been conducted on the soil vapor located underneath and immediately adjacent to the building, and the compounds detected included benzene, toluene, and m,p-xylene, having average soil vapor concentrations of 4300, 2000 and 1100 micrograms per cubic meter (μg/m3), respectively. The soil vapor sampling results indicated that soil vapor intrusion pathways cannot be ruled out. A sub-slab ventilation system was designed to remove the VOCs from the soil under the retail store to prevent potential intrusion of the vapor inside the building. This ventilation process(or vapor extraction system) consists of perforated polyvinyl chloride (PVC) insert pipes that penetrate the rear building foundation. A PVC header pipe connects the insert pipes to a blower system that moves air from the header pipe to a PVC exhaust riser. The exhaust riser (ventilation stack) discharges the soil vapor to the ambient air above the roof line of the building. The system is permanent and will operate continuously.

To avoid the appearances of taking VOCs of concern from one environment and discharging them freely to the ambient air, an air dispersion modeling analysis was performed to demonstrate that ambient air impacts due to the emissions from the ventilation stack would comply with all the appropriate air quality criteria. A basic land use analysis, including population density, was performed, and it was determined that the site is located in an urban setting. Air quality impacts at potentialreceptors were evaluated. Impacts in ambient air were determined using the United States Environmental Protection Agency (USEPA) Industrial Source Complex Short Term (ISCST3) dispersion model. These receptor impacts determined by the dispersion modeling analysis were compared to New York StateDepartment of Environmental Conservation (NYSDEC) air toxics criteria (annual guideline concentrations (AGCs) and short-term guideline concentrations (SGCs)). The results demonstrated that all VOCs complied with the AGCs and SGCs.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864706783791010

Publication date: 2006-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more