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Volume 4: Investigative approach for petroleum VIAP
Delineation of the vapor source for a petroleum release is necessary to identify which buildings and properties are within the LIZ (Section 4) and if there is sufficient vertical separation distance to screen out buildings (Section 5). The delineation required for the VIAP risk evaluation associated with a petroleum release will be the delineation of groundwater to the applicable unrestricted groundwater VIAC and the delineation of the NAPL body.
Additional information on vapor source delineation can be found in Attachment B.4 and additional information on NAPL evaluation can be found in EGLE’s Non-Aqueous Phase Liquid – Petroleum Releases Characterization, Remediation, and Management Guidance dated June 2023.
NOTE: Structures and properties outside of the LIZ require no further evaluation. Conduits and utilities outside of the LIZ only require evaluation if they have mobile NAPL that entered the utility within the LIZ and are found to be transporting NAPL or vapors beyond the LIZ.
