4 The record articles

4 The Record is a publication from ALL4’s team that takes an in-depth look at technical and regulatory topics.


State-Specific Considerations for SPCC Plans in Maryland

Posted: August 31st, 2021

This blog is part of a series that will cover key state-specific requirements for petroleum containing aboveground storage tanks (ASTs) with respect to Spill Prevention, Control, and Countermeasure (SPCC) compliance with 40 CFR Part 112.7(j).  In this edition, I will […]

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What’s New with New Source Review?

Posted: August 18th, 2021

During the previous administration, we saw quite a bit of work by the U.S. Environmental Protection Agency (EPA) around New Source Review (NSR).  As a reminder, the NSR permit program includes the prevention of significant deterioration (PSD) and the nonattainment […]

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Ambient Monitoring Networks and Environmental Justice

Posted: August 5th, 2021

In May 2021 the Air & Waste Management Association (A&WMA) virtually presented the Air Quality Measurements Conference.  Amongst the many discussions around the advancements in measurements of air quality, the most common themes revolved around the advancement of citizen-science air […]

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U.S. EPA to Reconsider PM2.5 NAAQS

Posted: July 23rd, 2021

On June 10, 2021 U.S. EPA announced that it would reconsider the previous administration’s decision to retain the particulate matter less than 2.5 microns (PM2.5) National Ambient Air Quality Standard (NAAQS).  The previous administration made its final decision to retain […]

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PFAS: State-by-State Regulatory Update

Posted: July 22nd, 2021

Given the current lack of all-encompassing federal environmental regulation around per- and polyfluoroalkyl substances (PFAS), states are taking it upon themselves to set their own standards amid growing public scrutiny.  With proposed house bills, rejections of bills, and other PFAS […]

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