ALS has the analytical expertise and project management capabilities to support a variety of soil vapor intrusion and indoor air investigations.
ALS has the analytical expertise and project management capabilities to support a variety of soil vapor intrusion and indoor air investigations. Subsurface vapor intrusion has become a topic of particular interest due to many factors including increased recognition of vapor intrusion as an important exposure pathway and greater emphasis on the remediation of contaminated sites that introduce harmful substances into indoor air.
Method and Procedures
Most current guidance documents recommend the use of EPA Methods TO-15 or TO-17 for the analysis of volatile organic compounds (VOCs) in vapor intrusion samples. ALS will work closely with you to set up your project prior to sampling to ensure your data quality objectives are met.
The laboratory provides analytical approaches and reporting limits suitable for both soil vapor and indoor air projects. For the analysis of indoor air samples, ALS has highly trained analysts that can perform EPA Method TO-15 in Selective Ion Monitoring (SIM) mode to provide results in parts per trillion levels for client-specific compound lists.
Soil Gas Tracers
Several state guidance documents recommend the practice of leak testing your soil vapor well with a tracer compound when collecting soil vapor samples to ensure that the well has been constructed and sealed correctly. ALS can support analysis of common tracer compounds such as helium, sulfur hexafluoride (SF6), and other VOCs as needed. Please contact your local ALS Technical Sales Representative for more details about the pros and cons of each tracer compound.