Geosyntec developed the high volume sampling (HVS) method a decade ago (McAlary, 2010) and since that time we have conducted hundreds of HVS tests.
Geosyntec has a large data set from a variety of sites that has been evaluated using a 2-layer flow model that can calculate a radius of influence of a mitigation system based on mass flux and calculate building specific attenuation factors. The presentation will describe a new simplified method to calculate the mitigation system radius of influence and building-specific attenuation factors using data collected during pressure-field extension testing.
The analysis is based on three simple measurements:
- the extraction flow rate,
- cross-slab applied vacuum at a radial distance of 3 feet and
- cross-slab applied vacuum at a radial distance of 10 ft.
The intent is to provide a practitioner with a rapid and useful screening level assessment of whether the benefits of reduced mitigation system costs warrant an investment in a more detailed mathematical analysis of the flow and vacuum data (McAlary, 2018). In addition, this new approach will provide a practitioner with a way to make real-time decisions regarding placement of communication test points during pressure-field extension testing.
- Geosyntec Authors: Paul Nicholson
- All Authors: Paul Nicholson
- Title: RemTEC, The Remediation Technology Summit
- Event or Publication: Event
- Practice Areas: Vapor Intrusion Assessment and Remediation
- Citation: Paul will present at the 2021 RemTEC Virtual Summit on March 9-11, 2021.
- Date: March 11, 2021, 1:50-2:15 p.m. ET
- Location: Webinar, Virtual Conference
- Publication Type: Platform Presentation