 ADVANCE \y63 

	UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

	REGION III

1650 Arch Street

	Philadelphia, Pennsylvania  19103-2029

May 13, 2010

Mr. Ali Mirzahkhalili, Administrator

Air Quality Management

Division of Air and Waste Management

Department of Natural Resources and Environmental Control

89 Kings Highway

Dover, Delaware 19901

Dear Mr. Mirzakhalili:

On April 16, 2010, U.S. Environmental Protection Agency (EPA) received a
revision to the Delaware State Implementation Plan (SIP) from the
Department of Natural Resources and Environmental Control amending
Section 3.0 of 7 DE Admin. Code 1125 to cite explicitly that nitrogen
oxide (NOx) is a precursor to the formation of ground-level ozone.  EPA
has determined that the submittal is administratively and technically
complete, and is reviewing it to prepare a Direct Final Rulemaking
Notice (DFRN) action. 

If members of your staff have any questions, they may direct them to
Sharon McCauley, Office of Permits and Air Toxics, at (215) 814-3376. 
She is the principal contact for this rulemaking.    

	Sincerely, 

						/s/

           David L. Arnold, Acting Division Director

                                                                      
Air Protection Division   

 

	Customer Service Hotline: 1-800-438-2474

