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.


Revisions to Proposed California Hazardous Waste Generator Rules

Posted: July 11th, 2023

Changes proposed to California’s hazardous waste program earlier this year are now undergoing a proposed modification and the revisions are open to public comment until July 20, 2023.  The United States Environmental Protection Agency implemented the Hazardous Waste Generator Improvements […]

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How to Properly Locate Stack Monitoring Equipment

Posted: July 5th, 2023

One of the biggest challenges with any continuous monitoring system (CMS) is the collection of representative data. While the technology has been around for decades, it continues to suffer from several issues such as low flow rates, non-laminar flow, sample […]

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