FROM: 

TO: 

SUBJECT: 

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

WASHINGTON, D.C. 20460 

FEB 0 1 2013 

~~ JeffMorris , ~ r r~:"'<!i4~~\...._"'"""o::::::==-- Deputy Director or t grams 

Office of Pollution Prevention and Toxics 

Siloxane Enforceable Consent Agreement Interested Parties 

OFFICE OF CHEMICAL SAFETY 

AND POLLUTION PREVENTION 

Siloxane Enforceable Consent Agreement Negotiation: Next Steps 

I am writing to share the latest developments in the effort to establish an enforceable 

consent agreement (ECA) to collect environmental monitoring data on 

octamethylcyclotetrasiloxane (D4). As you know, the ECA negotiation time period was recently 

extended to February 27, 2013. This extension was granted at the request of the Silicones 

Environmental Health and Safety Council of North America (SEHSC) to allow time for the 

revision of their monitoring proposal. 

It is clear that the scientific issues associated with developing a D4 monitoring program 

are numerous and complex. Because EPA plans to conduct a risk assessment of D4 

http://ww~ .epa.gov/oppt/existingchemicals/pubs/workplans.html), it is important that any 

monitoring data that result from the ECA are appropriate to the scope and policy objective of the 

risk assessment. To that end, EPA is developing a risk assessment plan for D4 and plans to have 

it reviewed in a peer consultation. This risk assessment plan will describe how EPA would assess 

D4 hazards, exposures, and risks. As part of the peer consultation, EPA will ask for input on 

aspects of the SEHSC and EPA monitoring proposals discussed in past ECA negotiation 

sessions. Advice from the reviewers on monitoring data needs will inform the ECA negotiations. 

The development and review of the risk assessment plan could take months. Therefore, 

interested parties should expect additional extensions of the ECA negotiation period until these 

activities are completed. For background on peer consultation, including how it differs from peer 

review, please refer to EPA's Peer Review Handbook at: 

http://epa.gov/pecrrcvicw/pdfs/peer review handbook 20 l2.pdf. 

Internet Address (URL) . http.//www.epa.gov Page 1 of2 

Recycled/Recyclable • Pnnted with Vegetable Oil Based Inks on 100% Postconsumer Process Chlonne Free Recycled Paper 
Recognizing that interested parties may need additional information regarding the 

developments described above, the agency will be scheduling an ECA meeting for mid February 

2013. We also hope to hear more about SEHSC's enhanced monitoring proposal at that meeting. 

If you have any questions about this letter, please feel free to contact either of the EPA leads for 

the ECA process, Ward Penberthy at (202) 564-8171 or Paul Lewis at (202) 564-6738. 

Siloxane Enforceable Consent Agreement Interested Partics 1 

Paul C. De Leo, American Cleaning Institute 

J Christopher York, Bluestar Silicones USA Corporation 

Kathleen P. Plotzke, Dow Corning Corporation 

Russell B. Mait, Evonik Goldschmidt Corporation 

Lisa M. DuMars, Momentive MPM Silicones, LLC 

Cynthia A. Finley, National Association of Clean Water Agencies 

John F. Krowka, Personal Care Products Council 

Jun 1-Iamuro, Shin-Etsu Silicones of America Inc. 

Karluss Thomas, Silicone Envirorunental Health and Safety Council of North America 

Trent M. Doyle , Keller and Heckman LLP 

Jack Linard, Unilever 

Hugh A Flack Jr., Wacker Chemical Corporation 

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