Contaminated Site Clean-Up Information (CLU-IN): Internet Seminar Audio Archives

Since 1998, The Contaminated Site Clean-Up Information (CLU-IN) website has presented Internet Seminars covering a wide variety of technical topics related to hazardous waste characterization, monitoring, and remediation. For each seminar topic, we have selected the highest-quality offering for placement in our archives. Beginning in May 2005, we began offering these archives via podcast, and this feed contains all seminars archived in the last 6 months. For a complete list of seminars archived since 2000 and videos of selected seminars archived since 2012, please visit Our Rehabilitation Act Notice for reasonable accommodation is available at CLU-IN was developed by the U.S. Environmental Protection Agency (EPA) but is intended as a forum for all waste remediation stakeholders. For more information and to view upcoming live offerings, please visit For a complete list of RSS feeds available on CLU-IN, please visit


Audio for "Enforcement 201: The CERCLA Lien - What Can It Mean? Issues Related to CERCLA Lien Choateness, Priority, and Jurisdiction," Mar 3, 2020

During the webinar we will address some background information on federal liens, the origin of CERCLA liens and how they function, including when they arise, how they are recorded and enforced, procedural requirements, and what happens when they meet the competition. Issues will include lien priority in light of the competition for often limited monies, consensual liens, involuntary liens, and what is "circular priority." To view this archive online or download the slides associated with this seminar, please visit


 2020-03-04  n/a