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EPA/SWER RIN: 2050-AF08 Publication ID: Spring 2010 
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 (EHS) 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 a rule proposing revisions to the TPQ for solids in solution. EPA is pursuing this proposal 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 intends to evaluate 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: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 355   
Legal Authority: 42 USC 1102   
Legal Deadline:  None
Action Date FR Cite
NPRM  11/00/2010    
Additional Information: SAN No. 4753.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Kathy Franklin
Environmental Protection Agency
Solid Waste and Emergency Response
5104A, 1200 Pennsylvania Avenue NW.,
Washington, DC 20460
Phone:202 564-7987
Fax:202 564-2625

Sicy Jacob
Environmental Protection Agency
Solid Waste and Emergency Response
5104A, 1200 Pennsylvania Avenue NW.,
Washington, DC 20460
Phone:202 564-8019
Fax:202 564-2625

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