UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

NATIONAL CENTER FOR ENVIRONMENTAL ASSESSMENT 

WASHINGTON, DC 20460 

February 8, 2016 

MEMORANDUM 

OFFICE OF 

RESEARCH AND DEVELOPMENT 

SUBJECT: 

FROM: 

Posting EPA-HQ-ORD-2013-0430 to Regulations.gov for Public Access 

Vicki Soto U./~1\./"" National Center for Environmental Assessment 

IRIS Division 

Thru: Gina Perovich 

Deputy Director, IRIS Division 

Office of Research and Development 

National Center for Environmental Assessment 

This memorandum authorizes the opening ofEPA-HQ-ORD-2013-0430 to 

Regulations.gov for public access from February 8, 2016 to December 31, 2016. 

EPA is actively working on the IRIS assessment of Hexahydro-1 ,3,5-trinitro-1 ,3,5-

triazine (RDX). During 2016, materials related to the RDX assessment may be discussed 

at an IRIS public science meeting or other public meetings related to the IRIS 

assessment. As part of the effort to increase the opportunity for public input, this docket 

will be used to accept public comments related to the IRIS assessment of RDX. 

Comments on the IRIS assessment ofRDX should be submitted to Docket ID No. EPAHQ-ORD-2013-0430 by one ofthe following methods: 

• http://www.regulations.gov. Follow the on-line instructions for submitting 

comments. 

• E-mail: Docket ORD(ci!epa.gov. 

• Fax : 202-566-9744. 

• Mail: U.S. Environmental Protection Agency, EPA Docket Center, (ORO 

Docket), Mail Code: 28221T, 1200 Pennsylvania Avenue, N.W., Washington, DC 

20460. 

• Hand Delivery: The ORO Docket is located in the EPA Headquarters Docket 

Center, EPA West Building, Room 3334, 1301 Constitution Avenue, N.W., 

Washington, DC 20004. Such deliveries are only accepted during the Docket's 

normal hours of operation, and special arrangements should be made for 

deliveries of boxed information. 

EPA's policy is that all comments received will be included in the public docket without 

change and may be made available online at http://www.regulations.gov, including any 

personal information provided, unless the comment includes information claimed to be 

Internet Address (URL) • http://www.epa.gov 

Recycled/Recyclable • Printed with Vegetable 011 Based Inks on 100"/o Postconsumer, Process Chlorine Free Recycled Paper 
Confidential Business Information (CBI) or other information whose disclosure is 

restricted by statute. Do not submit information that you consider to be CBI or otherwise 

protected through http://www.regulations.gov or e-mail. The http://www.regulations.gov 

Web site is an "anonymous access" system, which means EPA will not know your 

identity or contact information unless you provide it in the body of your comment. If you 

send an e-mail comment directly to EPA without going through 

http://www.regulations.gov. your e-mail address will be automatically captured and 

included as part of the comment that is placed in the public docket and made available on 

the Internet. If you submit an electronic comment, EPA recommends that you include 

your name and other contact information in the body of your comment and with any disk 

or CD-ROM you submit. If EPA crumot read your comment due to technical difficulties 

and cannot contact you for clarification, EPA may not be able to consider your comment. 

Electronic files should avoid the use of special characters, avoid any form of encryption, 

and be free of any defects or viruses. For additional information about EPA's public 

docket, visit the EPA Docket Center homepage at http://www2.epa.gov/dockets. 

Should you have any questions regarding this memorandum, please contact Eric Shultz at 

(202) 566-1883, or via email at schultz.eric(a),epa.gov.