Remediation Technology Summit

Lisa Reyenga
Lisa Reyenga

Senior Engineer
GEI Consultants

Lisa Reyenga is a Senior Engineer with GEI Consultants, Inc. She has ten years of experience in the field of characterization and remediation of NAPL contaminated sites. Lisa’s particular specialty is in the quantification of NAPL recoverability under complex hydrogeologic conditions. She earned in BS from Tufts University and MS from the Massachusetts Institute of Technology.

High Resolution Mobile NAPL Interval Identification and Transmissivity Calculations for DNAPL

Dense Non-Aqueous Phase Liquid (DNAPL) distribution can be complex, with multiple mobile NAPL intervals (MNIs) present. These multiple MNIs can result in perched DNAPL with exaggerated thicknesses of DNAPL in wells relative to actual MNI thicknesses in the formation. Published methods for measurement of DNAPL transmissivity yield artificially low values due to falsely large assumed drawdowns. The authors have developed procedures to identify each individual MNI, and to accurately calculate DNAPL transmissivity values for each MNI and for the well in the aggregate. This provides precise determinations of the elevation and thickness of each MNI as well as their associated DNAPL transmissivity values. This data augments the conceptual site model (CSM) to better quantify potential DNAPL migration risk and pathway identification, and design improved remedies. This data can also be used to justify cessation of DNAPL recovery to achieve site closure where no other risk or regulatory driver exists.

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