Passive Soil Gas Surveys

A Cost Effective Approach to Identifying Vapor Intrusion Pathways

Beacon Environmental Services offers an accurate and cost effective approach to identifying and monitoring vapor migration pathways of volatile and semi-volatile organic compounds (VOCs and SVOCs).

Using a passive soil-gas survey, Beacon Environmental screens for vapor intrusion pathways to identify where a limited number of summa canister or pumped tube samples need to be collected. In this way, the company reserves the more expensive summa canister or pumped tube samples for quantifying (rather than exploring and assessing) the concentrations of contaminants in areas where vapor intrusion pathways have already been identified with the lower cost passive soil gas survey.

As a result, Beacon Environmental increases the number of locations that are sampled, providing a more comprehensive and realistic evaluation of vapor intrusion pathways. At the same time, it reduces the overall sampling budget. In addition, the passive soil gas survey allows for detection of some chemicals at levels below the practical quantitation limits of summa canisters.

Beacon Environmental can sample directly on the ground surface, subsurface and/or in the ambient air in and around buildings to

• effectively characterize the migration pathways of contaminants

• locate and accurately map source areas of contaminants and vapor intrusion pathways into buildings

• identify whether compounds are present in the ambient air

• quantify the actual emission flux rates at the ground surface or through concrete slab surfaces

• measure the concentration present in soil gas or the ambient air

The following video shows the procedures for the installation and retrieval of passive soil gas samples:

Passive Soil Gas Sampling Instructional Video