6560-50-P ENVIRONMENTAL PROTECTION AGENCY 40 CFR Part 49, 51, 52, 60, 70, and 71 [EPA-HQ-OAR-2013-0685; EPA-HQ-OAR-2010-0505; EPA-1-IQ-OAR-2014-0606; EPAI-IQ-OAR-2015-0216; FRL- ] Source Determination for Certain Emission Units in the Oil and Natm·al Gas Sector; Oil and Natural Gas Sector: Emission Standards for New and Modified Sources; Review of New Sounes and Modifications in Indian Country: Federal Implementation Plan for Managing Air Emissions from True Mino1· Sources Engaged in Oil and Natural Gas Production in Indian Country; and Release of Draft Control Techniques Guidelines for the Oil and Natural Gas Indu s try AGENCY: Environmental Protec tion Agency (EPA).

ACTION: Propo sed rule ; extens ion of comment period. SUMMARY: On September 18, 2015, the Envi ronm e ntal Protection Agency (EPA) proposed three rules titled, "So urc e Determination i:or Certain Em iss ion Un itsin the Oil and Natural Gas Sector," "Oi l and Nat ural Gas Sec tor: Emission Standards tor New and Modified S ource s," and "Rev iew ofNew Sources and Modifications in Indian Country : Federal Impl ementation Plan for Managing Air Emissions from True Minor Sou r ces Engaged in Oil and N atural Gas Production in Indian Cou ntr y." The EPA also ann ounced the avai lab ilit y ofa draft Cont rol Techniques Guidelines (CTG) document titl ed, "Re l ease of Draft Co ntrol Techniques Guide lin es for the Oil and Natural Gas Industry, "ina notice published on September 18, 2015. The EPA is extending the comment period on the three proposed rules and the notice of ava ilability of the draft CTG document that was sch eduled toclose on November 17 ,2015 . The EPA has received several lett ers from trade and business organizations, states and tribes reque s ting add i tiona l time to review and comment on the three proposed rule revi s ion s, and the notic e of ava il ability of the draft CTG document. Pa ge I of3DATES: The public comment period for the three propo sed rul es and notice of avai lability ofthe CTG document publi shed in the Federal R eg;ste ron September 18, 2015 (80 FR 56579, 80 FR 56593, 80 FR 56553 and 80 FR 56577), is being extended. Written comme nts mu stbe recei ved on or before Dec e mber 4, 2015. ADDRESSES: The EPA has esta blished se parate dockets for each of the three proposed rulemaking s and the draft C T'G document (avai l able at http :// www.regulations.gov). For the propo sed rulemaking titled , "Source Determination for Certain Emission Units in the Oil and Natural Gas Sector ," the Dock etID No. is EPA-HQ-OAR-2013-0685. For the proposed rul emaki ng titled, "O il and Na tural Gas Sector: Emi ss ion Standards for New and Modified Source s," the Docket ID No. is EPA-HQ-OAR-2010-0505. For the proposed rulemaking titled , "Review ofN ew Sources and Mod ific ations in Ind ian Country: Fede ral impl e mentation Plan for Managing Air Emissions from True Minor Sou rces Engaged in Oil and Natura l Gas Production in Indian Country," the Docket ID No. isE PA-HQ-OAR-2014-0606. For the notic e of availabi lity titled , "Release of Draft Contro l Tec hniqu es Guide lin es for the Oil and Natural Gas Indu stry ," the Docket ID No. is EPA-HQ-OAR-20 1 5-0216. Inform a tion on all of the se actions is posted at ht!p :l/ www. e pa.gov /a irquality lo ilandgas/a c tions. html. Submit your comments, identified by the appropriate Docket ID,to the Fed e ral e Rulemaking Portal: http ://ww w. regulations.gov. Foll ow the on lineins truction s for submitting comments. Once submitted, comments cannot be edited or withdrawn. The EPA may publish any co mment received to its public doc ket. Do not s ubmit electronica lly any information you consider to be Confidential Business Information (CBI) oroth er information whose disclosure is restricted by statute. If you need to include CBI as part of yo ur comment, ple ase visit

http:/ / www.epa .go v/docket. s!co mments.html for instructions. Multimedia submissions (audio , Pa ge 2 of3video, etc.) must be accompanied by a written comment. The written comment is considered the official comment and should include discussion of all points you wish to make. For additional submission methods, the full EPA public comment policy, and general

guidance on making eff ec tive comments, please visit http://www.epa.govldockets/comments.html. FOR FlJRTHER INFORMATION CONTACT: For additional information on this action, contact Cheryl Vetter, Office of Air Quality Planning and Standards, Environmental Protection Agency (C504-03), Research Triangle Park, North Carolina 2771 1; telephone number (91 9) 541- 4391; fax number (919) 541-5509; email address: vefler.cheryl@epa.gov. SUPPLEMENTARY INFORMATION: After considering the reque sts to extend the public comment period received from various trade and business organizations, states and tribe s, the EPA has decided to extend the public comment period until December 4, 2015 . This extension will ensure that the public has additional time to review the three proposed rules and the draft CTG document. 11-5--/)Dated: Page 3 of3