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Mar
17

LNAPL Transmissivity Measurement Methods: A Preview of Developing Guidance (Webinar by Mike Hawthorne)

written by Andrea

NGWA LogoThe Aquifer Protection Interest Group is proud to present its first brown bag webinar of 2011
March 23, 2011, 1-1:30pm EST

Light Non-Aqueous Phase Liquid (LNAPL) transmissivity (Tn) can provide substantial improvements to LNAPL hydraulic mobility and recoverability analyses over traditional metrics such as LNAPL thickness in wells. Although methods to measure Tn have been available since the mid-1990’s, only within the last few years has widespread acceptance of Tn begun.  A nationwide team from industry, consulting, academia and government agencies has been working on an ASTM International® publication to provide guidance to measure Tn.  Four overall methods of Tn measurement are currently recognized:  1) baildown and slug tests, 2) manual skimming tests, 3) recovery data analysis, and 4) tracer testing.  Each of the four accepted methods varies with respect to its scale of measurement (time and space) and recommended utilization (startup/shutdown versus operational progress metric).  Tn should not be used as a risk-based site closure metric, but is a virtually ideal metric in maps, decline curve analyses, and other evaluations to measure LNAPL hydraulic recoverability.  To register please email rjones@ngwa.org with “LNAPL” in the subject line.

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