Vapor Intrusion; Who’s DEFAULT is it?

Written by Steve Henshaw, P.G., President & CEO, EnviroForensics, in Collaboration with Jeff Carnahan, L.P.G., Senior Project Manager, EnviroForensics.

As seen in the March 2011 issue of Cleaner & Launderer.

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As most drycleaners know, at some time in the not too distant future, you or someone you know will have to deal with the accidental release of perchloroethylene (Perc) or Stoddard solvent.  Even if the release is decades old and unknown to the current owner/operator, soil and/or groundwater contamination may come to light during a property transaction, a refinance or through the course of standard due diligence investigations.  This finding commonly results in a demand by the state environmental regulatory agency to determine the extent of the contamination and if necessary, remediate the contamination. 

Environmental regulatory agencies often prioritize contaminated sites based on whether or not people may come into contact with, or be exposed to toxic chemicals.  The three primary ways (or pathways) that people can come into contact with these chemicals is by getting contaminated soil or groundwater on their skin, eating and ingesting contaminated soil or groundwater, or by inhaling the chemicals that volatilize from the contaminated soil or groundwater.  If it is determined that one of these potential exposure pathways is complete, it becomes a priority to abate the exposure immediately, even before the extent of the impacts have been fully defined.  Continue reading “Vapor Intrusion; Who’s DEFAULT is it?”

State of California Targets Dry Cleaners

Written By Steve Henshaw, P.G., President & CEO, EnviroForensics
As seen in the May 2009 issue of Western Cleaner & Launderer.

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Dating back to March 1992when the California Regional Water Quality Control Board published a report entitled, “Dry Cleaners – A Major Source of PCE in Groundwater,” the state of California has concentrated its regional groundwater investigations on dry cleaning facilities. Although the March 1992 report looked at other industries as potential sources of perchloroethylene (PCE) groundwater contamination, it concentrated its investigation on dry cleaners. Continue reading “State of California Targets Dry Cleaners”

Conducting Site Characterizations

Written by Steve Henshaw, P.G., President & CEO, EnviroForensics

As seen in the February 2009 Western Cleaner & Launderer

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In past articles, we discussed the difference between Phase I and Phase II investigations.  A Phase I generally refers to a due diligence evaluation that address the past land uses of a property or group of properties.  A Phase II generally includes an initial or preliminary investigation to determine whether or not the soil, soil gas or groundwater beneath the subject site is contaminated with metals, petroleum hydrocarbons, chlorinated hydrocarbons (solvents) or other chemicals of concern, based on the past land uses.

Continue reading “Conducting Site Characterizations”