January 2019

Vapor Intrusion Fundamentals 46 – PCE, TCE, DCE, and Vinyl Chloride

Tetrachloroethene (perchloroethene, PCE) and its breakdown products, trichloroethene (TCE), dichloroethene (DCE), and vinyl chloride (VC) are present at virtually every site that Cox-Colvin investigates. According to the ATSDR’s TOXFAQ website, “Tetrachloroethylene has been found in at least 945 of the 1,699 National Priorities List sites”, and “Trichloroethylene has been found in at least 1,045.” As was discussed in Focus on the Environment August 2017 and February 2018 issues, TCE is especially problematic, so it’s worth understanding the relationship between these compounds. To learn more about these common vapor-intrusion constituents, read on……

Use of Temporary Authorizations in RCRA Permitting

EPA or authorized states may temporarily authorize a permittee of a hazardous waste facility for an activity that would be the subject of a Class 2 or Class 3 permit modification in order to, among other things, facilitate timely implementation of closure or corrective action, to prevent disruption of ongoing waste management activities, or to facilitate other changes to protect human health and the environment. To see how else RCRA temporary authorizations can be used, read more…

Waters of the United States Rulemaking Update

On December 11, 2018, U.S. EPA (EPA) and U.S. Army Corps of Engineers (USACE) unveiled the latest proposal to define Waters of the United States (WOTUS) and limit the jurisdiction of the Clean Water Act (CWA). EPA water chief David Ross and the acting EPA administrator stated that the new rule would be much more limited in scope and simpler to apply than the 2015 Obama-era Clean Water Act.

RSL, MCL, MCLG, UPUS – What’s it all mean?

While many people understand that there is a limit to how much contamination can be present in groundwater, they are often surprised to learn that there is not just one limit. These numbers vary depending on the contaminant, regulatory agency or program, best available analytical and treatment technologies and costs, and other factors. For a quick crash course on this alphabet soup, read more …

Widely Utilized EPA Regional Screening Levels Updated

EPA recently updated its widely used Regional Screening Levels . The updated RSLs (dated November 2018) replace the May 2018 version. The new RSLs reflect changes in the toxicity and chemical-specific parameters for a limited number of select compounds.  To learn more about RSLs and find out what the update included and how to stay apprised of changes to the RSLs, read more …   

Cox-Colvin & Associates, Inc.

Project Spotlight

Coming Soon in the February Newsletter

  • 2017 Hazardous Waste Biennial Report
  • Michigan Science Panel Shares Findings on PFAS

Upcoming Events

Colvin & Associates, Inc. personnel are actively involved in the technical and regulatory aspects of the environmental field as it evolves. Cox-Colvin will be participating as presenters, sponsors, or exhibitors at the following environmental conferences in the coming months.

March 26-27, 2019: Cox-Colvin & Associates will be at the 28th Annual Sustainability & EHS Symposium in Cincinnati, OH. Stop by our booth to say hello.