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Volume 4: Investigative approach for petroleum VIAP
Near-slab soil gas or soil gas samples outside of a structure is the primary way to evaluate the VIAP when the vapor source is adjacent to and not beneath a structure. For petroleum, soil gas samples are collected for the evaluation of O2 and chemical analysis as described in Appendix B in the March 2016, Application of Target Detection Limits and Designated Analytical Methods. Oxygen concentrations can be measured with calibrated field screening instruments.
If the O2 in the soil gas is greater than 2%, then there is sufficient O2 to support rapid aerobic degradation and a reduction in the LIZ may be established. Chemical analysis collected should affirm this. The number of sampling events required for a petroleum release for a structure that is adjacent to a vapor source is found in Table C-3.
