Download PDF Applied NAPL Science Review (ANSR) Demystifying NAPL Science for the Remediation Manager Review Board: J. Michael Hawthorne, PG, Board of Chairman, GEI Consultants, Inc. Mark Adamski, PG, BP America Dr. Randall Charbeneau, University of Texas Dr. Sanjay Garg, Shell Global Solutions (US) Inc. Dr. Terrence Johnson, United States Environmental Protection Agency Andrew Kirkman, PE, AECOM Mark Malander, ExxonMobil Environmental Services Perched LNAPL J. Michael Hawthorne, PG - GEI Consultants, Inc. Mark Adamski - BP America Sanjay Garg, PhD - Shell Global Solutions (US) Inc. Andrew Kirkman, PE - AECOM Have you ever wondered why the apparent NAPL thickness (ANT) gauged in wells at a site is large, but increased groundwater extraction does not increase LNAPL recovery rate? The cause may be perched LNAPL. BACKGROUND: Much like groundwater, LNAPL can be perched on finer-grained soils in the vadose zone, although the underlying processes that cause LNAPL and groundwater to perch...

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