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TECHNICAL TOUR — HONEYWELL 34TH STREET BSVE FACILITY
Wednesday, December 5, 4:00 pm - 6:00 pm
Included with your conference registration.
A VAPOR INTRUSION SITE CLOSURE SUCCESS STORY
The objective of the Honeywell 34th Street Biologically Enhanced Soil Vapor Extraction (BSVE) system tour is to learn about the innovative approaches used to investigate and then successfully remediate subsurface VOC impacts. The potential for vapor intrusion (VI) into existing buildings was evaluated as part of the site investigation and incorporated multiple lines of evidence (MLE) in order to demonstrate the lack of impacts to occupied buildings. Subslab, indoor, and outdoor measurements of the tracer compound radon were also used to calculate building-specific attenuation factors and ultimately, demonstrate the lack of VI impacts throughout the various air extraction and injection conditions during BSVE treatment.
This tour provides attendees a real-life opportunity to reinforce many of the topics covered during the VI specialty meeting. On-site posters will be available at multiple stations during the tour to highlight the approaches used prior to and throughout the successful implementation of BSVE. One of the posters will include the iterative five-step VI building prioritization process, along with the multiple lines of evidence used during the VI investigation and long-term monitoring. There will be another station highlighting the effective BSVE remediation process. The MLE methodology used to evaluate VI provides a successful framework/menu of options for other VI sites across the nation and world. These lines of evidence included consideration of site history, VOC source areas, and vadose zone soil impacts, groundwater concentrations, exterior soil gas data, building surveys/construction/air exchange, subslab, indoor, and/or outdoor air VOC and radon data, background sources, and building-specific attenuation factors.
This site tour will highlight the successful implementation of BSVE to remediate subsurface impacts in a relatively large area
beneath multiple buildings to achieve site closure under the state’s corrective action program. The findings of the multiple phases of the VI assessment and MLE evaluation provided strong evidence to support the conclusion of no current or future VI concerns, making this an excellent case study for conference participants.