What is the recommended exposure period for the GORE™ Modules?
For site screening using soil gas or subslab vapor sampling, a 10 to 14-day period will most likely allow the samplers to reach a state of equilibrium with the surrounding environment, and provide a representative site distribution. Longer exposure periods do not appear to be beneficial except at sites where depth to contaminated groundwater is great, the contaminant levels are very low, or the contaminants of concern have high molecular weights such as PAHs. GORE™ Surveys have been successful with exposure periods of a few hours to a few days.
