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Volume 4: Investigative approach for petroleum VIAP
A vapor source may travel from the petroleum source area to a receptor along a preferential pathway such as utility corridors, which could include, but not be limited to, sewer and septic system piping, drains, water and gas lines, and electrical conduits. It may also enter into the utility itself that will act as an underground conduit that can transport vapor and allow direct entry into a structure. Both scenarios are described in more detail in C.3.1 Petroleum Vapor Source within Utility Backfill Material and C.3.2 Vapor Source within an Underground Conduit.
