NJ DEP has formally recommended the use of certified Radon mitigation firms to design and install VOC reduction systems. VOC mitigation is similar in method to Radon mitigation. A sub-slab depressurization system reduces the driving-force that moves the VOC vapors into the building, and at the same time replaces the contaminated soil gas with cleaner makeup air.  

There is a major difference between VOC and Radon mitigation: in the Radon case there is a clear and well-accepted standard for successful mitigation: 4.0 picocuries of Radon per liter of air. For VOCs the standard is not clear. There are professional articles describing the legal liability incurred by property owners and developers where plumes of contamination exist under or near a building site. Site assessments are not reliable in determining pre-construction vapor concentrations, and pre-mitigation and post-mitigation measurements generally cannot accurately predict background vapor concentrations. 

Nevertheless, there is significant and persuasive rationale for VOC mitigation in known or likely cases where vapor intrusion is a risk. 

Radiation Data has designed and installed more than 30 VOC Removal systems from commercial and government buildings, plus more than 100 residential systems. The non-residential sites include a post office, the Philipsburg Armory, a gas station, two dry cleaning sites, a fuel oil distributorship, a strip mall, and a number of various commercial and industrial sites. The residential properties include individual sites and a major new housing development on a known or suspected contaminated tract. 

VOC system designs require careful analysis of sub-slab air flows and pressure field profiles. Our formal proposal includes a description of the extent of the VOC problem, a detailed pressure field map, a list of the system components and their functions, a firm price, and a completion schedule. Unless exceptions are taken, the project cost includes the cost of local construction permit applications and fees.