Vapor Intrusion Testing and Mitigation Services
Vapor Intrusion (VI) is a relatively new area of environmental practice with potentially high liability being applied to a large number of sites, including sites which had previously obtained closure. VI screening will be required as part of ASTM Phase I Environmental Site Assessments (ESAs) beginning in March 2013 using ASTM standard E 2600 as an add-on to the existing ASTM E 1527-05. VI is now often the driving factor in both determining the need for mitigation and obtaining closure for sites. Although some petroleum sites have VI issues, the majority of sites with substantive VI issues are chlorinated solvent sites, with some examples being dry cleaners or industrial sites where degreasers were used.
Troy Risk's staff have worked on numerous VI sites to evaluate the potential for impact to source area site buildings (industrial, dry cleaners, etc.) and structures in the immediate vicinity including industrial, commercial, public, and residential buildings. Troy Risk staff have obtained air samples from:
- Soil Gas
- Ambient Air
- Sub-slab Air
- Crawl Space Air, and
- Indoor Air
Our staff are well-versed on appropriate sampling techniques, including leak detection for sub-slab sampling and the use of evaluating pressure gradients to demonstrate the direction of air flow across slabs.
We have overseen the implementation of both pre-emptive and mandated remediation systems including sub-slab depressurization systems ranging from simple radon-type systems to more sophisticated systems and vacuum extraction systems (SVE and MPE) to mitigate exposure to sub-slab vapors. Our staff have also worked with IDEM staff (Brownfields, State Cleanup, etc.) to evaluate potential VI impacts to new developments.