Soil-Gas & Indoor Air Sampling

Overview

Soil gas is defined as the vapors located in the air spaces between soil particles. Contaminants present in soil or groundwater could produce vapors that may move through the spaces between soil particles and enter buildings through openings or cracks in the foundation in a process called “vapor intrusion”. If Vapor Intrusion is identified at a site, measures can be taken to stop the contaminants from entering the building via sealing cracks in the foundation, covering sumps, adjusting the building heating system, and/or installing a ventilation system under the basement floor (Sub Slab Depressurization System).

If contaminants are found to present in soil gas beneath a structure, or if there are others reasons to believe that indoor air has been impacted by OHM, indoor air sampling can be conducted to measure potential human exposure over various time frames.

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