### Posting an FDMS Docket without a Federal Register Notice

MEMORANDUM SUBJECT: FROM:

Thru: Post ing EPA- HQ-OAR-20 I 0-1 059 to Regulation s.goy ror Public Access Larry D. Wa llace

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## Jtfch~~~ Damberg Acting G roup Leader, SLPG, AQPD**~PS** 

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# \A;Uq-y This memorandum au th o ri zes th e posting 0 EPA -HQ -OAR-ZOI 0- 1 059 to Regu la t io n s.goy for public access. On September 22, 20 1 1, EPA posted its draft non-binding guidance tit l ed , "Guidance for I -Hour S02 NAAQS SIP Submi ssions" on it s website a nd invited public comme nts on this gu idan ce document. As a result of the comments that EPA receiv e d on the draft g ui dance, we decided to draft a White Paper re l ated to o ur current thinkin g on how we s hould move forward with implementation of the I

- h our S02 NAAQS are seeki ng comme nts on the Whi te Paper. T h e purpose of thi s paper i s to fac ili tate input from s tate s, tribes, and o th er inte res ted stakeho lders on EPA's im pl ementation of the prim ary I-hour su l fur dioxide (S0 2) Nat ional Ambient Air Quality Standard (NAAQS). In particular , thi s paper focuses on the determinatio n of whether the air qua li ty in a give n area currently meet s the NAAQS. This determination occurs primarily in the context of des ig nating areas as attainme nt , nonattainment , or unclassifiable; an d in th e context of redesignatin g areas from nonattainment , attainment, or unclassifiable to another status. EPA anticipates that some combination of enhan ced ambient monitoring and tec hnically credible dispersion modeling (th e combination of which we refer to as a " hybrid approach") i s like l y need e d to make this det erm in ation i n these contexts. To identify a workable approac h , EPA is so li citing stake ho ld er input on h ow be st to determine w hether an area attain s th e S02 NAAQS (e.g., by defining and establishing a robust, representative monit o rin g ne twork for S02 acros s the country, and/or by app l ying an appropriate modelin g approach). EPA is also so li citi ng input o n h ow best to impl e ment s u ch an approach (e.g. , impl emen tation opt ions and SIP tim e lin es for areas in w hi c h vio l ations ma y be identifi ed). This p aper addresses the se top ic s and poses severa l "c h arge" quest i ons intended to focus upcoming stakeh older discussions. T hi s document w ill be ope n for public comme nt from OS / 25 / 20 1 2 to 06122 120 1 2. ] Submit y our comments, identi fied by Docket ID No. EPA -H Q-OAR-201O-1059, by one of the following meth ods: • www.regulat ion s.gov: Follow the o n - lin e instruction s for s ubmittin g

### comments. EPA' s policy is that all comments rece iv e d will be includ ed in th e public docket w ith o ut change and m ay be made available o nline at http :// www. regu lat io n s.gov , i nclud in g any p erso na l information provided, unle ss the comment includ es information claim e d to be Co nfid e ntial Business Inform ation (CBI) o r oth er information whose disclosure i s restricted b y statut e. Do not s ubmit in f o rmation th a t yo u consider t o b e CB I or oth erw i se protected throu gh http ://www.regu!ations.govore-mail. The http ://www. regulations.gov Web si te is an "ano nym ou s access " system , w hi ch means EPA w ill no t know you r identity or contact inf o rmation unl ess you provid e it in the bod y of yo ur co mment. If yo u se nd an e-ma il com me nt directly to EPA without go i ng th ro ugh http ://www.regu lati o n s. gov. yo ur e-mai l address w ill be automatically cap tured and includ e d as part of th e comment that is placed in th e publi c dock e t and m ade avai l ab le on the Internet. If yo u s ubmit an e lectron ic comment , E PA r eco mm e nd s that yo u inclu de your n ame and other co ntact information in the bod y of yo ur comment and with any di sk or CD

- ROM yo u su bmit. If EPA canno t rea d yo ur co mment due to technical difficultie s and cannot co ntact you for clarification, EPA ma y not be ab le to cons id er you r com me nt. Electronic file s s hould avoid the use o f special characters, avo id an y form of encryption, and b e free of any defects o r viruses

. For add iti o n a l inf o rma ti o n abou t EPA's pub l i c docket, vis it the EPA Docket Ce nter homepa ge at http j/www

. epa.gov/ epahom e/docket s. htm

. Should you have an y questions regarding this memorandum , ple ase contact Eric S hult z at (202) 566 -1 883 , or v i a email atsch ul tz.e ric@epa.gov.