4 The Record is a publication from ALL4’s team that takes an in-depth look at technical and regulatory topics.
U.S. EPA Finalizes Revisions to Appendix W Modeling Guidelines
Posted: December 19th, 2024
On November 20, 2024, the United States Environmental Protection Agency (U.S. EPA) published the final rule revising 40 CFR Part 51 Appendix W: Guideline on Air Quality Models (Appendix W). Appendix W outlines the U.S. EPA […]
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U.S. EPA Releases TANKS 5.1
Posted: December 18th, 2024
On October 9, 2024, United States Environmental Protection Agency (U.S. EPA) released version 5.1 of their TANKS software in conjunction with updates to Section 7.1 – Organic Liquid Storage Tanks of the AP-42 Compilation of Air Pollutant Emission Factors. TANKS […]
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U.S. EPA Finalizes Revisions to the Secondary NAAQS
Posted: December 18th, 2024
On December 10, 2024, the United States Environmental Protection Agency (U.S. EPA) issued its finalized revisions to the secondary National Ambient Air Quality Standards (NAAQS). The relatively minor proposed changes, first proposed in April 2024, only affect the secondary standards […]
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Final Amendments to National Emission Standards for Hazardous Air Pollutants: Rubber Tire Manufacturing
Posted: December 11th, 2024
The U.S. Environmental Protection Agency (U.S. EPA) has published final amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Rubber Tire Manufacturing (40 CFR 63, Subpart XXXX) to establish emissions standards for the rubber processing subcategory. The […]
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U.S. EPA Issues Memo on Adjusting Condensable PM Test Results
Posted: December 10th, 2024
On November 21, 2024, the U.S. Environmental Protection Agency (EPA) issued a short Memorandum entitled: Condensable PM Adjustment for Ammonium Sulfate Formation in M202 Test Results. The actual correction method is provided by OTM-59, Method for the Correction of Residual […]
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U.S. EPA Releases Proposed Updates to Stationary Combustion Turbines NSPS
Posted: December 4th, 2024
On November 22, 2024, U.S. Environmental Protection Agency (EPA) proposed the first of what is expected to be three new or revised rules related to the emissions of criteria pollutants, air toxics, and greenhouse gasses (GHG) for stationary combustion turbines. […]
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New Lead Regulations in California: A Closer Look at Changes to the California Lead Standard
Posted: December 4th, 2024
With new lead standards approved by the California Occupational Safety and Health Standards Board (Cal/OSHA) on February 15, 2024, California is moving toward greater protections for employees exposed to lead. These changes, set to take effect on January 1, 2025, […]
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U.S. EPA Releases Draft Interim Framework for Advancing Consideration of Cumulative Impacts
Posted: December 3rd, 2024
On November 21, 2024, the U.S. Environmental Protection Agency (U.S. EPA) published the long awaited draft Interim Framework for Advancing Consideration of Cumulative Impacts. This document, while perhaps meant to fulfill the main priority for the Biden administration to present […]
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Enforcement Alert: Solid Waste. U.S. EPA Enforcement Initiative for Landfills to Meet Greenhouse Gas Compliance
Posted: November 21st, 2024
The United States Environmental Protection Agency (U.S. EPA) recently issued an Enforcement Alert signaling a critical move toward stricter regulation of municipal solid waste (MSW) landfills to address non-compliance with air quality standards, specifically around monitoring and controlling greenhouse gas […]
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The LCRR Compliance Deadline has Passed-What is Next?
Posted: November 20th, 2024
On October 8th, the Biden Administration finalized the rule for Lead and Copper Rule Improvements (LCRI). This came just 8 days before the October 16th compliance deadline for the Lead and Copper Rule Revisions (LCRR). Under the LCRR an initial […]
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