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MPCA Announces Interim Changes to Indoor Air Screening Levels

By Bruce Schaepe | July 20, 2016

What are ISV's? An important environmental driver on many property investigations and redevelopment projects is the presence of contaminated vapors in the air and in the pore spaces of soil, also known as soil gas. These vapors come from contaminated soil or groundwater and may travel hundreds of feet from the original source of contamination. State and federal regulators have determined that if high concentrations of contaminated vapors are present near or below a building, those contaminated vapors may enter the building through cracks or small openings in the building floor slab, and mix with the indoor air. As a...

Changes to MPCA Hazardous Waste Requirements

By Jennifer Wolff, PG, CHMM, CPG | July 6, 2016

As of April 30, 2016, the Minnesota Pollution Control Agency (MPCA) has reduced the paperwork requirements for most hazardous waste generators. Hazardous waste generators of any size in most of Minnesota (except those located in Anoka and Scott Counties) are no longer required to send copies of any hazardous waste manifests to the MPCA or the respective county government of the generator, unless explicitly requested. Don’t throw those manifests out, though - you will still need to retain the manifest copies in your files. What is a hazardous waste manifest? A hazardous waste manifest is a multi-copy shipping paper that...

MPCA Policy is Changing: Sub-Slab Vapor Sampling Now Required for New Construction

由Chris McElligott | November 18, 2015

The Minnesota Pollution Control Agency’s (MPCA) policies regarding vapor intrusion are changing. If pre-construction soil gas samples exhibit volatile organic compound (VOC) concentrations exceeding ten times the Intrusion Screening Values (ISVs), the MPCA Voluntary Investigation and Cleanup (VIC) program may require follow-up sampling in addition to installing sub-slab vapor mitigation systems and/or vapor barriers in newly constructed buildings. New requirements may also include sub-slab sampling at discrete locations through the newly constructed slabs. Further response actions such as indoor air sampling and upgrading to active venting may also be required if follow-up post-construction sub-slab VOC concentrations are elevated, such as...