4 The Record is a publication from ALL4’s team that takes an in-depth look at technical and regulatory topics.
Appendix W Revision: The New Era of Air Quality Modeling – SO2 Modeling Updates
Posted: March 1st, 2017
If you’ve visited ALL4’s website within the past few weeks (c’mon, don’t you visit daily?), you’ve likely seen a wealth of information regarding the U.S. Environmental Protection Agency (U.S. EPA) revisions to 40 CFR Part 51, Appendix W…
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Comment Period Extended for General Permit (GP)-5 and GP-5A
Posted: February 24th, 2017
The Pennsylvania Department of Environmental Protection (PADEP) has announced that the comment period for the proposed General Permit 5 (for Natural Gas Compressor Stations, Processing Plans and Transmission Stations) and the proposed General Permit 5A…
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Confidence, Consulting and Expensive Diplomas
Posted: February 23rd, 2017
In my opinion, the most important building block for the foundation of a successful career in any consulting field is confidence; Confidence in the advice and guidance that you’re giving to your clients. But you can’t have confidence without knowledge; Knowledge that…
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Clean Air Act, the Foundation of Air Quality Regulations
Posted: February 23rd, 2017
ALL4 prides itself on the foundational knowledge of air quality regulations and the historical perspective that accompanies the nearly 50 years of air quality laws and statutes in the United States. However, we recognize that the pool of air quality professionals…
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Refinery Fenceline Monitoring Data of Concern: Now What?
Posted: February 14th, 2017
In the December 2016 edition of 4 The Record (4TR), Nick Leone of All4 Inc. (ALL4) provided insight on where facilities that are subject to the Petroleum Refinery Sector Rule in 40 CFR Part 63, Subpart CC (National Emission Standards […]
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Appendix W Revision: The New Era of Air Quality Modeling – (Re)Introducing MMIF, an Alternative Option for Met Data
Posted: February 9th, 2017
As a self-described computational meteorologist, I get pretty obsessed with weather models, especially models of severe storms like hurricanes or big winter storms. If the coverage on the local news or weather networks is any indication, I don’t think I’m alone in this. My…
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Appendix W Revision: The New Era of Air Quality Modeling – Introduction
Posted: January 26th, 2017
(UPDATE 1/26/17) The long awaited revisions to the 40 CFR Part 51, Appendix W (also known as the Guideline on Air Quality Models referred to as Guideline hereafter) were finally published in Federal Register (FR) on January 17, 2017. The final Guideline, which was signed by U.S. EPA…
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What-If Island
Posted: January 25th, 2017
This blog is about making a distinction and then doing something about it. At ALL4, we embrace a coaching management philosophy and we believe that by facilitating conversations that prompt self-discovery great things happen…
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2017 Air Quality Look Ahead
Posted: January 17th, 2017
Changes in the Wind | John Egan For over 40 years I’ve been involved in the business of environmental regulation, and more specifically air pollution control. From my early days as a field enforcement officer in Pennsylvania’s hard coal region […]
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Appendix W Revision: The New Era of Air Quality Modeling – AERMOD Modeling System Updates
Posted: January 17th, 2017
(UPDATE 1/26/17) I have to say, I personally was prettyyyy excited for 2017 to finally get here [and according to the internet (which is obviously never wrong), I wasn’t the only one]. Likewise, the air quality modeling team here at ALL4 has been anxiously awaiting the…
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