These two methods form the foundation of where the sampling for most of the other stack methods are applied and the determination of the mass emission rate of their target species. The presentation will cover the origin and evolution of the methods and their derivatives and provide in depth treatments of the theoretical and practical aspects of them.  This will include the method applicability and limitations, equipment, and techniques. Information will also be provided on the current state of the art, evolving technologies, and drivers for improving these measurements.

This presentation will provide an overview of the most pressing risk, remediation, and waste management issues associated with PFAS (perfluorinated alkyl substances).  There are thousands of individual PFAS chemicals, although only a handful have been studied or regulated. The webinar will discuss the toxicity and the adverse health effects linked to PFAS, regulatory management strategies, and current approaches for managing and remediating and PFAS-impacted soil and ground water. In addition, approaches used by the US Air Force to evaluate and manage PFAS contamination at their facilities will be discussed.

This webinar addresses current issues associated with transitioning from the old landfill rules to the new landfill rules. The webinar will provide an overview of the substantive rule changes and implementation challenges due to overlapping regulatory requirements. This webinar will provide both a regulatory and legal perspective of the current landfill rules and include:  

•          A brief overview and comparison of existing (NSPS WWW) vs new (NSPS XXX/EG Cf)  requirements.

•          A brief summary of the possible changes to NESHAPs requirements and how these changes  may impact NSPS/EG compliance. 

•          Implementation challenges associated with overlapping requirements and compliance timelines.

•          Challenges to and approaches for modifying Title V permits to include new requirements.

•          Status of final rulemaking. 

On November 20, 2019, the US EPA published revisions to its AP-42 emission factor guide, Chapter 7.1, for estimating air emissions from storage tanks. This webinar will review the final revisions, highlight differences from the proposed revisions, and identify the more significant potential impacts including:

-           Methodology for estimating tank cleaning emissions,

-           Revision of tank temperature equations,

-           Guidance for tanks storing hot stocks,

-           Increase of the default vapor pressure for No. 6 Oil,

-           Addition of emission factors for new deck fitting options, and

-           Statement that EPA's TANKS software “is known to have errors, and is no longer supported.”