Department of Natural Resources and Environmental Control 

Air Quality Management Section responses to United States Environmental 

Protection Agency comments received on August 03, 2009 on 

Delaware’s Ozone, Fine Particulate Matter (PM2.5) NAAQS and Visibility and 2006 

24-Hour PM2.5 NAAQS State Implementation Plans (SIP) 

Comments on the Proposed DE Infrastructure SIP Submittals 

A. Addendum to Ozone, Fine Particulate Matter (PM2.5) NAAQS and 

Visibility SIP

Comment 1: Title page: Change “Revision to...” to “Addendum to the...” 

Response: Delaware agrees with this comment, and revised accordingly.

Comment 2: Table (pages 4 -5): The following Regulations were not found in the EPA 

approved SIPs for Delaware and also not found in 40 CFR 52.420(c): Regulations, 18, 

22, 29, 34, 43, 45. 

Response: Delaware agrees with this comment, and References to Delaware

Regulations, 18, 22, 29, 34, 43, and 45 were deleted. 

Comment 3: Table on page 8 – Certification section: §110(a)(2)(G) – Delete second 

paragraph (underlined). This is mentioned in the SIP revision section – page 17. 

Response: Delaware agrees with this comment, and this Paragraph was deleted. 

Comment 4: Page 14 – under §110(a)(2)(D): Delete the first bullet (authority to 

regulate sources). 

Response: Delaware agrees with this comment, and this bullet was deleted. 

Comment 5: Check numbering of footnotes. 

Response: Footnotes were corrected.

B. 2006 24-Hour PM2.5 NAAQS SIP 

Comment 1: Title page: Change “...Requirements in...” to “...Requirements of...” 

and add PM2.5 to “Implementation, Maintenance, and Enforcement of the 2006 24-Hr 

PM2.5 NAAQS.” 

Response: Title was changed as requested.
Comment 2: Page 3, 3rd paragraph, second sentence... Change “in September” to “on 

October 17, 2006...” 

Response: Dates changed as requested. 

Comment 3: Table, page 4, insert Regulation before 46. 

Response: “Regulation” inserted as requested.

Comment 4: Table (pages 4 -5): The following Regulations were not found in the EPA 

approved SIPs for Delaware and also not found in 40 CFR 52.420(c): Regulations, 18, 

22, 29, 43, 45. 

Response: Delaware agrees with this comment, and References to Delaware

Regulations, 18, 22, 29, 43, and 45 were deleted. 

Comment 5: Table on page 7 – Certification section: §110(a)(2)(G) – Delete second 

paragraph. This is mentioned in the SIP revision section – page 14. 

Response: Delaware agrees with this comment, and the second paragraph on page 7 

in the table was deleted. 

Comment 6: Page 11, under §110(a)(2)(D): Delete the first bullet (authority to regulate 

sources). 

Response: Page 11, first bullet was deleted as requested. 

Comment 7: Page 11, under §110(a)(2)(D)(i)(I): What does this number refer to - [3] ? 

There is a number 3 footnote on page 10. 

Response: This was a typo and was corrected. 

Comment 8: Page 12: Regulation 1142, Section 2, Control of NOx Emissions from 

Industrial Boilers and Process Heaters at Petroleum Refineries, has not been submitted to 

EPA as a SIP revision. 

Response: Delaware agrees with this comment, and the reference to Regulation 1142, 

Section 2, Control of NOx Emissions from Industrial Boilers and Process Heaters at 

Petroleum Refineries was deleted. 

Comment 9: Page 14: §110(a)(2)(G) – Delete: “For the 1997 and 2006 PM2.5 NAAQS, 

the emergency episode plan will be updated after EPA develops new thresholds per 40 

CFR 52.420(c), as necessary.” This sentence will make this element incomplete. Copy 

the sentence on page 17 – revised December 2007 submittal. 

Response: Delaware agrees with this comment, and revised as requested.
Comment 10: Page 15: §110(a)(2)(H) – Delete: “For the 2006 24-hr fine particulate 

matter.5 NAAQS, the attainment demonstration is not yet due under the CAA, and will 

be developed as a SIP revision, as required.” This sentence will make this element 

incomplete. 

Response: Delaware agrees with this comment, and this sentence was deleted. 

Comment 11: Page 15: §110(a)(2)(I) – Delete: “For the 2006 24-hr PM2.5 NAAQS, any 

remaining applicable requirements which are not yet due under the CAA, will be 

developed as SIP revisions, as required.” This sentence will make this element 

incomplete. 

Response: Delaware agrees with this comment, and this sentence was deleted 

Comment 12: Page 16: §110(a)(2)(I) – Delete: “For the 2006 24-hr PM2.5 NAAQS, any 

remaining applicable requirements which are not yet due under the CAA, will be 

developed as SIP revisions, as required.” This sentence will make this element 

incomplete. 

Response: Delaware agrees with this comment, and this sentence was deleted 

Comment 13: Page 17: §110(a)(2)(K) – Delete: “For the 2006 24-hr PM2.5 NAAQS, 

any remaining applicable requirements which are not yet due under the CAA, will be 

developed as SIP revisions, as required.” This sentence will make this element 

incomplete. 

Response: Delaware agrees with this comment, and this sentence was deleted