1. OPPT R ISK A SSESSMENT P ROGRAM N OVEMBER 13, 2013

2. R ISK A SSESSMENT & R EDUCTION  Risk assessments focused on specific uses subject to TSCA control  If the final risk assessment indicates significant risk, OPPT will evaluate and pursue appropriate risk reduction  If no significant risk is found, OPPTwill conclude work on that chemical  OPPT will update its TSCA Work Plan over time Office of Pollution Prevention & Toxics 2

3.  In March 2012, EPA’s Office of Pollution Prevention and Toxics (OPPT) identified a work plan of 83 chemicals for risk evaluation  OPPT plans to use the results of the risk assessment process to focus and direct the activities of the Existing Chemicals Program under the Toxics Substances Control Act (TSCA)  ATO was part of the 83 work plan chemicals initially selected for risk assessment  In August 2012, OPPT published the peer review plan for the ATO risk assessment and requested public input  In January 2013, the draft ATO risk assessments were published in the Federal Register announcing public input for the draft and request for nominations for the peer review panel Office of Pollution Prevention & Toxics 3 B ACKGROUND

4. P EER R EVIEW PROCESS  EPA requests that no individuals or organizations contact in any way its contractor or subcontractors panel members regarding the subject of the peer review, send them written materials regarding the subject of the peer review or make any requests appeared linked to peer review.  Contractor will direct panel members to report any such contacts and will take appropriate action in consultation with EPA to ensure independence and impartiality of peer review process. Office of Pollution Prevention & Toxics 4

5. R ESOURCES To learn more about TSCA Work Plan Chemicals and Assessments: http://www.epa.gov/oppt/existingchemicals/pubs/workplans.html http://www.scgcorp.com/ATO2013/