Vapor Intrusion Services
	Soil Vapor Surveys are critical investigative tools when assessing potential contamination at dry cleaners, gasoline service stations and other sites using volatile organic compounds and cholrinated hydrocarbons. We  conduct soil vapor surveys to assess upward vapor risk from volatile chemicals. Contaminated soil and groundwater can release volatile chemicals (such as PCE, TCE, benzene, toluene, ethylbenzene, and xylenes) in vapor phase. These vapors migrate through subsurface soil, ground surfaces, and flooring in open areas of buildings, causing health risks for building occupants.
Active Collector	Viridian conducts active, passive and flux chamber soil vapor surveys using EPA-supported methods and multi-state guidance. We can collecct soil vapor samples at multiple depths through any type of surface or flooring. We use hand-operated equipment for limited access sites and sub-slab sampling in building interiors. Vapor samples are stored in air tight Tedlar® bags or Summa® canisters that are shipped directly to a laboratory for analysis.
Passive Collector	Services Offered: • On-Site Sample Analysis • Conceptual Site Models • Active and Passive Soil Vapor Surveys • Flux chamber surveys • Sub-slab and Near-slab Sampling • Indoor Air Sampling • Semi-Permanent Vapor Monitoring Probes • Experienced personnel and technicians following ASTM, ITRC, EPA,    and local regulatory accepted standards.