NSPS EG rules

September 15, 2021

EPA Alternative Test Method


The EPA issued a newly approved alternative test method (ALT-143) for compliance with the enhanced monitoring provisions in the National Emission Standards for Hazardous Air Pollutants (NESHAPs) for MSW Landfills (40 CFR 63 Subpart AAAA updated March 26, 2020). The approved alternative method instead of Method 10 allows for direct monitoring of CO at a landfill gas well using a portable gas analyzer. The NESHAP requires weekly monitoring of CO at the landfill gas well if the gas temperature is over 145F and the regulatory agency has approved no higher operating value under the NSPS/EG rules or NESHAPs. The Solid Waste Working Group (SWWG) coordinated with landfill gas meter manufacturers (QED, Elkins Earthworks) to prepare this method.

EIL approved sharing a flow chart and Excel file that can be used for monitoring/documentation purposes when using this approved alternative “field instrument method.” Don’t hesitate to get in touch with your SCS air emissions/compliance expert or contact us at for details.

EPA will post the alternative test method to the Broadly Applicable Approved Alternative Test Methods | US EPA website page. Take note that the hyperlink in EPA’s letter is out of date.

Pending Approval
The Solid Waste Working Group (SWWG) also submitted two alternative methods in lieu of Method 10 to EPA for approval using grab sample (canister, foil bag) and laboratory analysis, one with GC/FID and the other GC/TCD instrumentation. The SWWG coordinated with several national laboratories on the methods. EPA is completing its review of the two proposed methods, anticipating EPA approval before September 27, 2021, the effective date of the enhanced monitoring provisions.






Posted by Diane Samuels at 4:53 pm

March 19, 2018

A look at the confusion stemming from regulatory uncertainty of new rules limiting air emissions from municipal solid waste landfills by David Greene, P.E., SCS Engineers – Asheville, NC.

The landfill industry continues to work with EPA Administration to get a longer-term stay to work out needed NSPS/EG rule changes. At this time, industry representatives are hopeful both these related goals can be achieved.

While the new NSPS/EG rules became effective back in 2016, the concerns with the rules raised at the time still remain unresolved. Despite this, we can expect resolution though it may take some time to fix. The fog should be lifting, yielding changes that are expected to be more workable for both the landfill industry and state/local regulators. In the meantime, stay tuned and stay informed.

Read the full article with links to the NSPS/EG update in a recently published SCS Technical Bulletin.



Posted by Diane Samuels at 6:00 am