Environmental Investigations Using Versatile, Vapor-Permeable, Adsorbent-based Passive Samplers

Environmental professionals agree that a conceptual site model (CSM) derived from accurate and comprehensive site assessment data will provide the foundation for implementing an efficient and cost-effective site remedy. A well-developed CSM can accelerate the site clean-up and closure process, and minimize the associated sampling and monitoring costs substantially. Vapor-permeable passive samplers provide a unique method for site assessment. Their simplicity, sensitivity and overall cost effectiveness allows one to collect a robust dataset that can be used to focus subsequent more complex and expensive sampling techniques. These versatile samplers can also be used to monitor remedial progress, in vapor intrusion investigations, and in long-term groundwater monitoring.

Passive samplers are capable of sampling soil gas, sub-slab soil gas, air, and water; however, use and performance are a function of sampler design. Typically, passive samplers are easy-to deploy and have minimal operating requirements. The patented GORETM Module is a versatile, diffusion-based passive sampler. The sampler is constructed of a vapor-permeable, waterproof GORE-TEX® membrane, which houses hydrophobic adsorbents. The unique design of the GORETM Module allows it to be deployed directly in unsaturated and saturated soils and sediment, in surface and groundwater, and in indoor, outdoor, and crawlspace air. The GORE-TEX® membrane facilitates vapor transfer to the adsorbent, while protecting the adsorbent from soil, liquid water or other potential interferences, maintaining sample integrity.

Case studies demonstrating its utility in a variety of sampling applications will be presented, along with a discussion of the passive sampler.