LNAPL

LSPA Comments on MassDEP's Second Public Review Draft LNAPL Guidance 

The LSPA submitted comments on December 18, 2015 to MassDEP on its Second Public Review Draft of Light Nonaqueous Phase Liquids (LNAPL) and the MCP: Guidance for Site Assessment and Closure, Policy #WSC‐14‐450. Read our cover letter and comments

MassDEP Bureau of Waste Site Cleanup Updates 

The second public review draft of the Light Nonaqueous Phase Liquid (LNAPL) Guidance is posted under “Draft Policies & Guidance” here.  This document has been updated to reflect public comments received on the first (July 2014) draft.  BWSC will be holding a meeting on the revised draft on Thursday November 12, 2015 at 10:00 am at MassDEP’s Boston Office, One Winter Street 2nd floor conference rooms A & B.  Please submit any written comments on the second public hearing draft by Friday December 18, 2015 to Kendall.Marra@MassMail.State.MA.US

By: Wesley E. Stimpson, Technical Practices Committee

The recent revisions to the MCP, most of which became effective June 20, 2014, substantially change how sites with NAPL are characterized and moved through the MCP process.  In addition to some new terminology, MassDEP has embraced the fundamental scientific principles describing the behavior of fluid flow in porous media necessary to assess NAPL in subsurface strata.  PRPs are now asked to provide multiple lines of evidence to support any endpoint conclusions, and MassDEP will be looking for more data than has historically been provided in support of closing out this type of disposal sites.  The NAPL Upper Concentration Limit of 0.5 inches no longer needs to be met, and in fact is no longer available to be used as a component for obtaining an endpoint. 

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