• Vapor Intrusion as a Major Cleanup Driver
    April 19, 2018
    Vapor Intrusion Emerges as a Major Cleanup Driver When I started work as an environmental professional in 1986, I do not recall thinking about or even being aware of the risks posed by vapor intrusion …
  • Settlement of Structures Part 2 – “The Fix”
    April 2, 2018
    In Part I of this topic, we discussed the assessment and the identification of the cause of settlement of existing structures.  Once the causes have been identified, we can then provide alternatives t …
  • What is Connecticut Valley Varved Clay?
    March 20, 2018
    Large areas of the Connecticut River Valley are underlain by a type of soft soil deposit known as Connecticut Valley Varved Clay (CVVC).  This deposit formed at the bottom of a large glacial lake, com …
  • New Book! – Manufactured Gas Plant Remediation: A Case Study
    March 16, 2018
    Well, it’s done.   I’m proud and distinctly relieved to announce the publication of my book, Manufactured Gas Plant Remediation: A Case Study (2018, CRC Press).  Like any proud parent, I can’t fight t …
  • PCB Regulations: Why the 50 ppm cut-off?
    February 15, 2018
    The other day I got an email asking a good, basic question about the federal PCB regulations: “Where did the 50 ppm regulatory cut-off for PCBs come from?”  Is it a science based number? Or did the 50 …
  • Geotechnical Engineering Series: Building Settlement issues in Western New England
    January 9, 2018
      The OTO geotechnical group will feature a series of blogs discussing soil settlement concerns and mitigation.  Topics will include forensic studies and remediation alternatives for existing building …
  • An Ounce of Prevention
    October 2, 2017
    A lot of what OTO does involves helping clients manage risks. Sometimes we do this in a reactive mode– digging up leaking gasoline tanks, capping abandoned landfills, and otherwise resolving problems …
  • Why do I have to remove my old underground storage tank?
    August 23, 2017
      The Underground Tank Problem If you own an old underground storage tank (UST) in Massachusetts, particularly a single-walled steel tank, chances are you have heard about the push to remove these old …
  • Changes to the RCRA Generator Requirements
    May 31, 2017
    With all the hubbub in Washington DC lately, it’s been largely overlooked that some of the regulatory changes that started under the previous administration are only now coming to fruition. For exampl …
  • PCBs in Buildings: Primary Sources, Secondary Sinks and Tertiary Sinks
    May 9, 2017
    PCBs, polychlorinated biphenyls, are a group of related chemicals that were used for a variety of applications up until the 1970s.  In the 1960s the development of improved gas chromatography methods …