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### Stout, Alan

From: Stout, Alan Sent: Monday, July 28, 2014 1:36 PM To: John McKnight; Lowry, Jeff@ARB; Guerry, William M.; Roger T. Gault; Brian Campbell; Jim Watson; Monday, Scott@ARB Cc: Julia Giuliano Subject: RE: Draft Regulatory Amendments

Dear colleagues,
In the file I sent last week with amendments to diu rnal emission test procedures for nonroad equipment , we had an oversight that led to canister preconditioning spec ifications that should have applied only for nonmar ine fuel tanks. As noted below, the text of §1060.525 should include a different preconditioning step for testing marine systems.

I hope to send around a final file that incorporate s all the input from the various parties once the r eviews are complete. Since this one omission is more substant ial than the rest, I want to get the word out soone r to make sure everyone had a chance to comment on the intended ch ange to the regulation.

Alan

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§1060.525 How do I test fuel systems for diurnal em issions? (a) * * * (4) If the fuel tank is equipped with a carbon cani ster, load the canister with butane or gasoline vap ors to its canister working capacity as specified in §1060.240(e)(2)(i) and attach it to the fuel tank in a way that repre sents a typical inuse configuration. Purge the canister as follows to prepare for emissi on measurement: (i) For marine fuel tanks, perform a single heating and cooling cycle as specified in paragraph (a)(7) of this section without measuring emissions. (ii) For nonmarine fuel tanks, establish a characteristic purge volume by running an engine with the fuel tank installed to represent an in-use configuration. Me asure the volume of air flowing through the caniste r while the engine operates for 30 minutes over repeat cycles o f the appropriate duty cycle used for certifying th e engine for exhaust emissions. Set up the loaded canister for testing by purging it with the characteristic p urge volume from the engine simulation run.

From: Stout, Alan
Sent: Thursday, July 24, 2014 11:26 AM
To: 'John McKnight'; 'Lowry, Jeff@ARB'; 'Guerry, Willi am M.'; 'Roger T. Gault'; 'Brian Campbell'; Jim Wat son Cc: Julia Giuliano Subject: Draft Regulatory Amendments

Dear colleagues, The attached file includes a variety of draft amend ments to the regulations for Small SI engines in 40 CFR part 1054 and for Nonroad SI equipment in 40 CFR part 1060. Thes e amendments involve several corrections, clarifica tions, and minor adjustments to the regulations. We do not anticipa te that any of these changes add new requirements o r involve any
controversial elements. We therefore intend to inc lude them in a direct final rule that we hope to co mplete later this year. Since this rulemaking process depends on us not receiving adverse comments, we want to share th e draft language just to make sure people have a chance to weigh in before we go ahead with the published fina l rule. Feel free to share this with others as appropriate to help us make sure everything is on target.

If we can get any comments on the draft text by Aug ust 5 or so, that would keep us on a good track for finishing the rule in an orderly timeframe.2 Thanks for your help.

Alan

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Alan Stout U.S. EPA Office of Transportation and Air Quality 2000 Traverwood Dr. Ann Arbor, MI 48105 734-214-4805 734-214-4816 (fax) stout.alan@epa.gov www.epa.gov/otaq/