Demonstration/Validation of More Cost Effective Methods for Mitigating Radon and VOC Subsurface Vapor Intrusion to Indoor Air: Mitigation System Optimization
Abstract
This technical guide provides a description of suggested activities associated with planning, designing, operating, and decommissioning a mitigation system to address Radon or volatile organic compound (VOC) vapor intrusion to indoor air. This guide provides a comprehensive list of considerations, and the user is encouraged to apply professional judgement to select the relevant and appropriate elements for each building, based on the site-specific conceptual model, and building-specific conditions. Prior to this research, conventional mitigation system design was typically based only on achieving a specified level of applied vacuum below the floor slab (e.g. ASTM E2121, AARST/ANSI Standards, State Guidance documents for VOC Vapor Intrusion and radon posted at: https://www.geosyntec.com/vapor-intrusion-guidance), with verification via indoor air sampling ad analysis. This research provides additional lines of evidence including radial profiles of vacuum, velocity, travel time, and leakage across the floor slab as well as the mass emissions rate, which increase the level of understanding and confidence in the system design and operation and can identify the presence and potentially also the location of preferential pathways from the subsurface to indoor air.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 29, 2019
- Accession Number
- AD1134960
Entities
People
- Todd A McAlary