ABSTRACT
In the last 15 years the nature of site investigation work has expanded significantly in areas involving environmental-related problems. Many of these problems have been related to the underground storage and accidental release of petroleum products and other contaminants into the subsurface. An attractive site investigation technique that may be used in situations involving light nonaqueous-phase liquid (LNAPL) petroleum contaminants is the measurement of soil gas constituents in the unsaturated (vadose) zone above the water table.
