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EPA/SWER RIN: 2050-AF08 Publication ID: Fall 2011 
Title: Emergency Planning and Community Right-to-Know Act: Modification to the Threshold Planning Quantity Methodology for the Extremely Hazardous Substances That are Solids in Solution 
Abstract: EPA is considering an alternative approach for the threshold planning quantity (TPQ) for chemicals on the Extremely Hazardous Substances (EHSs) List that are handled as solids in solution. The current TPQ for solids in solution is based on the assumption that the entire quantity of the solid chemical at a facility could potentially be released to air in the event of an accident. EPA is considering revising the TPQ for solids in solution. EPA is pursuing this in part based on industry's request to revisit the TPQ rationale for the chemical paraquat dichloride (handled as a solid in aqueous solution). EPA has evaluated various experimental data for accidental air releases of solutions containing solid chemicals when developing revised TPQs. EPA is also considering public comment on the appropriateness of considering aerosol size as a factor for potential off-site exposure to communities. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 355   
Legal Authority: 42 USC 1102   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  04/15/2011  76 FR 21299   
NPRM Comment Period End  06/14/2011    
Final Action  08/00/2012    
Additional Information: EPA publication information: NPRM - http://www.regulations.gov/#!documentDetail;D=EPA-HQ-SFUND-2010-0586-0001; EPA Docket information: EPA-HQ-SFUND-2010-0586
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Local, State 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL: www.epa.gov/oem  
RIN Data Printed in the FR: No 
Agency Contact:
Kathy Franklin
Environmental Protection Agency
Solid Waste and Emergency Response
1200 Pennsylvania Avenue NW, Mail Code 5104A,
Washington, DC 20460
Phone:202 564-7987
Email: franklin.kathy@epa.gov

Sicy Jacob
Environmental Protection Agency
Solid Waste and Emergency Response
1200 Pennsylvania Avenue NW, Mail Code 5104A,
Washington, DC 20460
Phone:202 564-8019
Fax:202 564-2625
Email: jacob.sicy@epa.gov