Connecticut Departmentof ENERGY & ENVIRONMENTAL PROTECTION 79 Elm Street • Hartford, CT 06106-5127 www.ct.gov/deep AffirmativeAction/Equal Opportunity Employer



### David B. Conroy, Chief Air Programs Branch December 24, 2014 United States Environmental Protection Agency

- Region 1 5 Post Office Square

- Suite 100 Boston, MA 02109-3912 

### Re: Withdrawal of Provision in aRevision to the ConnecticutStateImplementation Regarding Connecticut'sAmbient Air Quality Standards Dear Mr. Conroy: OnApril 22, 2014, I submitted materials to you as a revision to the State Implementation Plan (SIP) concerning updates to Connecticut's ambient air quality standards. I made that submission in answer to your request to update those standards to support your approval ofinfrastructure SIPs for the National Ambient Air Quality Standards (NAAQS). Among the Connecticut ambient air quality standards included in that submission is a standard for dioxin, for which there is no equivalentNAAQS. With this letter, I withdraw the submission ofthe Connecticut ambient air quality standard for dioxin, which is set out in subsection (m) of section 22a-174-24 ofthe Regulations ofConnecticut State Agencies. Attachment A ofthe April 22, 2014 submission is attached to this submission, with subsection (m) in strikeout font. No other element ofthe April22, 2014 submission is changed bythis letter. Ifyou require additional information or have any questions about this submission, please contact Merrily Gere ofthe Bureau ofAir Management at (860) 424-3416 or merrily.gere@ct.gov. Sincerely, 

# Q.._.o-L



# ~-- Anne R. Gobin Chief, Bureau ofAir Management

cc: David Mackintosh, EPA Region 1

### Attachment A This attachment is the same as Attachment A ofthe April22, 2014 SIP submission with the addition ofstrikeout font to subsection (m) ofRCSA section 22a-174-24 onpage 7.REGS-1 Rev. 09/2013 Page 1 of 9

State of Connecticut 

### REGULATION ofthe NAME OF AGENCY:

**En~rgy** and Environmental Protection 

### Concerning SUBJECT MATTER OF REGULATION: 

### Amendment ofSections 22a-174-24, 22a-174-1(10), 22a-174-1(88), 22a-174- 3a(k)(5) and 22a-174-28(a)(5) ofthe Regulations ofConnecticut StateAgencies Section 

## i. Subdivision (10) ofsection 22a-174-1 ofthe Regulations ofConnecticut State Agencies is revised as follows: (10) "AAQS" or "[Ambient] ambient air quality standard" means any standard [which] that establishes the largestallowable concentration ofa specificpollutant inthe ambient air [ofa region or subregion] as establishedby the [United States Environmental Protection·Agency] Administrator in40 CFR 50 orby the commissioner [andwhichis listed] in section 22a-174-24 ofthe Regulations ofConnecticut State Agencies. 

### Sec 2. Subdivision (88) ofsection 22a-174-1 ofthe Regulations ofConnecticut State Agencies is revised as follows: (88) "PM 10" means particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers as measured by a reference method set forth in40 CPR 50, Appendix [M] 

## .J, and designated as a reference method in accordance with 40 CPR 53 orby an equivalent method approved bythe Administrator in accordance with40 CPR 53. 

### Sec. 3. Subdivision (5) ofsection 22a-174-3a(k) ofthe Regulations ofConnecticut State Agencies is revised as follows: (5) Ambient Monitoring 

### (A) ::»r-w ..-.... The permit application



### sh~ll contain an analysis ofthe effect on



### ambie:Qi~ 

# = quality inthe area ofthe subject source or-modification, ofthe



## followiu~:~~ 20 --;-1.1- ::c pollutants:

**~~~** 1

**2:5~~** ...J
· **ZM~** (i) those thathave allowable emissions inexcess ofthe amount

**liS;tcl~;in T~le** 
. . <()
- 3a(k)-1 ofthis subsectiOn, or

**U):-.!~** '7:"

**as.?~** . Z(;/irrJ ,CPage 2 of 9
(ii) those [listed in section 22a-17 4-24 ofthe Regulations ofConnecticut State Agencies,] for which an ambient air quality standard exists;
r (B) For anypollutant listed in Table 3a(k)-1 ofthis subsection for which [aNational AmbientAir Quality Standard] an AAQS does not exist, the analysis shall contain such air quality monitoring data as the commissioner determines is necessary to

.assess ambient air quality for thatpollutant in any areathat suchpollutant may affect; (C) For anypollutant [(other than nonmethane hydrocarbons)] for which [aNational AmbientAir QualityStandard] an AAQS exists, the analysis shall contain [continuous] air.quality monitoring data approved bythe commissioner and gathered for purposes ofdetermining whether emissions ofthat pollutant would cause or contribute to a violation ofsuch standard or a Prevention ofSignificant Deterioration increment listed in Table 3a(k)-2 ofthis subsection; (D) The [continuous] air quality monitoring datathat is requiredby subparagraphs (B) and (C) ofthis subdivision shall have been gathered over a period ofone (1) year and shall represent the year precedingreceipt ofthe application, unless the commissioner determines inwriting that a complete and adequate analysis can be accomplished with monitoring data gathered over a period shorter than one (1) year, butnotto be less thanfour (4) months; (E) The owner or operator shall, after construction ofthe subject source or modification, conduct such ambient monitoring as the commissioner determines is necessary to determine the effect whichthe emissions from such source or modificationmayhave, or are having, on air quality in any area. 

### In addition, the owner or operator shall submit the results ofsuch ambient monitoring to the commissioner withinthirty (30) days ofdata collection; and (F) The owner or operator shall meet the requirements of40 CFR 58, Appendix [B] A during the operation ofmonitoring. Sec. 4. Section 22a-17 4-24 ofthe Regulations ofConnecticut State Agencies is revised as follows: Sec. 22a-174-24. Connecticut primary and secondary ambient air quality standards (a) [Definitions.Page 3 of 9
(1) "Ambient air" means that portion ofthe atmosphere, external to buildings, to which the general public has access. (2) "Reference method" means a method ofsampling and analyzing for an air pollutant, as described in Title 40 Code ofFederal Regulations part 50, as from time to time may be amended. (3) "Equivalentmethod" means any method ofsampling and analyzing for an air pollutant that has been designated in accordance with Title 40 ofFederal Regulations part 53, as from time to time maybe amended. (4) "Acceptable method" means a reference method, an equivalent method, or any other method determined bythe Commissioner.] 

### Reserved. (b) The concentration ofpollutants in the ambient air, as measuredby [an acceptable method] a reference or equivalent method designated in 40 CFR 50 or40 CFR 53, shall conform with levels specified [below] inthis section as the applicable air quality standards for these [substances] air pollutants throughout Connecticut. No person shall operate [a] any stationary source, which has a significant impact on air quality [listed inTable 3a(i)-l set forth] as described 

### in section 22a-174-3a(i)(l) ofthe Regulations ofConnecticut State Agencies for the pollutants listed in Table 3a(i)-1 ofsection 22a-174-3a ofthe Regulations ofConnecticut State Agencies, in such a manner as to cause.or contribute to a violation ofan ambient air quality standard [listed in Section 22a-174-24]. 

### (c) [Reference conditions. All measurements ofair quality are correctedto a reference temperature oftwenty (20) degrees C. and to a reference pressure of760 millimeters ofmercury (1,013.2 millibars or 29.92 inches ofmercury).] 

### Reserved.Page 4 of 9



### (d) Connecticut primary and secondary ambient air quality standards for sulfur oxides (sulfur dioxide). 

## ill The level ofthe Connecticut primary 1-hour ambient air quality [

**standar~s]** standard for sulfur oxides, measured as sulfur dioxide, [are: (1) 80 micrograms per cubic meter (0.03 ppm)-- annual arithmetic mean. (2) 365 micrograms per cubic meter (0.14 ppm)-- maximum 24-hour concentrationnot to be exceeded more than once per year.] is 7 5 parts per billion, as set out in 40 CFR 50.17. 

## ill The level ofthe Connecticutprimary 24-hour ambient air quality standard for sulfur oxides, measured as sulfur dioxide, is 0.14 parts per million, as set out in 40 CFR 50.4. 

## ill The level ofthe Connecticut primary annual ambient air quality standard for sulfur oxides, measured as sulfur dioxide, is 0.030 parts permillion, as set out 

### in40 CFR 50.4
. .(42 The level ofthe Connecticut secondary 3-hour ambient air quality standard for sulfur oxides, measured as sulfur dioxide, is 0.5 parts per million, as set out in40 CFR 50.5. 

### (e) [Connecticut secondary ambient air quality. standards for sulfur oxides (sulfur dioxide). The Connecticut secondary ambient air quality standard for sulfur oxides, measured as sulfur dioxide, is: (1) 1,300 micrograms per cubic meter (0.5 ppm)-- maximum 3-hour concentrationnotto be exceeded more than once per year. (2) 260 micrograms per cubic meter (0.1 ppm)-- maximum 24-hour concentration notto be exceeded more than once peryear. (3) 1,300 micrograms per cubic meter (0.5 ppm)-- maximum 3-hour concentrationnotto be exceeded more than once per year.] 

### Connecticutprimary and secondary ambient air quality standards for PM 10. The level ofthe Connecticut primary and secondary 24-hour ambient air quality standards for particulate matter, measured as PM_lO, is 150 micrograms per cubic meter, as set out in40 CFR 50.6.Page 5 of 9
(f) Connecticut primary and secondary ambient air quality standards for PM2.5 (fine particulate.matter}. (1) [The level ofthe Connecticutprimary 24-hour ambient air quality standard for particulate matter, measured as PM10, is 150 micrograms per cubic meter (ug/m3), 24-hour average concentration. The standard is attained whenthe expected number ofdays per calendar year with a 24-hour average concentration above 150 (ug/m3), as determined in accordance with Appendix K ofTitle 40 Code ofFederal Regulations Part 50 revised as ofJuly 1, 1989,

**i~** equal to orless than one.] The level ofthe Connecticutprimary annual ambient air quality standard for fine particulate matter, measured as PM_2.5, is 12.0 micrograms per cubic meter, as set outin40 CFR 50.18. (2) [The level ofthe Connecticutprimary annual standard for particulate matter, measured as PM10, is 50 micrograms per cubic meter (ug/m3), annual arithmetic mean. The standard is attained when the expected annual arithmetic mean concentration, as determined in accordance with Appendix K ofTitle 40 Code ofFederal Regulations Part 50 revised as ofJuly 1, 1989, is equal to or less than 50 (ug/m3).] The level ofthe Connecticut secondary annual ambient air quality standard for fine particulate matter, measured as PM 2.5, is 15.0 micrograms percubic meter, as set out in40 CFR 50.13. 

## ill The level ofthe Connecticutprimary and secondary 24-hour ambient air quality standards for fine particulate matter, measured as PM 2.5, is 35 micrograms per cubic meter, as set out 

### in40 CFR 50.18 and 40 CFR 50.13, respectively. (g) [Connecticut secondary ambient air quality standards for particulate matter (1) The level ofthe Connecticut secondary 24-hour ambient air quality standard for particulate matter, measured as PM10, is 150 micrograms per cubic meter (ug/m3), 24-hour average concentration. The standard is attained whenthe expectednumber ofdays per calendar year with a 24- hour average concentration above 150 (ug/m3), as determined in accordance with Appendix K ofTitle 40 Code ofFederal Regulations Part 50 revised as ofJuly 1, 1989, is equal to orless than one. (2) The level ofthe Connecticut secondary annual standard for particulate matter, measured as PM10, is 50 micrograms per cubic meter (ug/m3), annual arithmetic mean. The standard is attained when the expected annual arithmetic mean concentration, ·as determined in accordance withAppendix K ofTitle 40 Code ofFederal Regulations Part 50 revised as ofJuly 1, 1989, is equal to or less than 50 (ug/m3).] Reserved.Page 6 of 9 

### {h) Connecticut primary [and secondary] ambient air quality standards for carbon monoxide. [The Connecticutprimary and secondary ambient air quality standards for carbon monoxide, are:] The levels ofthe Connecticut primary ambient air quality standards for carbon monoxide, as set out in 40 CFR 50.8, are as follows: (1) [10 milligrams per cubic meter (9 ppm)

-- maximum 8-hour concentration notto be exceeded more than once per year.] 9 parts per million for an 8-hour average concentration; and (2) [40 milligrams per cubic meter (35 ppm)-- maximum 1- hour concentration notto be exceeded more than once per year.] 35 parts permillion for a 1-hour average concentration. 

### (i) Connecticut primary and secondary ambient air quality standards for ozone. [(1) 

### Connecticut 8-hour primary and secondary ambient air quality standards for ozone. (A) The level ofthe Connecticut 8-hourprimary and secondary ambient air quality standards for ozone is 0.08 parts permillion, daily maximum 8-hour average, measured by a reference method based on 40 CFR 50, Appendix D. (B) The Connecticut 8-hour primary and secondary ambient air quality standards are met at an ambient air quality monitoring site when the average ofthe annual fourth-highest daily maximum 8-hour average ozone concentration is less than or equal to 0.08 parts permillion, as determined in accordance with40 CFR 50, Appendix 

### I. (2) 

### Connecticut 1-hour primary and secondary ambient air quality standards for ozone. (A) The level ofthe Connecticut 1-hourprimary and secondary ambient air quality standards for ozone is 0.12 parts permillion (235 J.Lg/m3), measured by a reference method based on40 CFR 50, Appendix D. (B) The Connecticut 1-hourprimary and secondary ambient air quality standards are met when the expected number ofdays per calendar year with maximumhourly average concentrations above 0.12 parts permillion is equal to or less than one day, as determined by 40 CFR 50, Appendix H.] 

## ill The level ofthe Connecticut 8-hour primary and secondary ambient air quality standards for ozone, measured by a reference methodbased onAppendix D ofCFR 50.10 and designated 

### in accordance with40 CFR 53, is 0.08 parts per million, as set outin 40 CFR 50.10.Page 7 of 9 

## ill The level ofthe Connecticut 8-hour primary and secondary ambient air quality standards for ozone is 0.075 parts per million, daily maximum 8-hr average, as set out in 40 CFR 50.15. (j) 

### [Connecticutprimary and secondary ambient air quality standards for hydrocarbons. The hydrocarbons standard is for use as a guide in achieving oxidant standards. The Connecticut primary and secondary ambient air quality standard for hydrocarbons is: 160 micrograms per cubic meter (0.24 ppm)-- maximum 3-hour concentration (6 am to 9 am) notto be exceeded more than once per year.] 

### Reserved. (k) Connecticutprimary and secondary ambient air quality standards for [nitrogen dioxide]

**oxi~es** 

### ofnitrogen (nitrogen dioxide). [The Connecticut primary and secondary ambient air quality_ standard for nitrogen dioxide, is: 100 micrograms per cubic meter (0.05 ppm)

-- annual arithmetic mean.] 

## ill The level ofthe Connecticut primary and secondary annual ambient air quality standard for oxides ofnitrogen, measured as nitrogen dioxide, is 53 parts perbillion, as set outin40 CFR 50.11. 

## ill The level ofthe Connecticut primary 1-hour ambient air quality standard for oxides of nitrogen, measured as nitrogen dioxide; is 100 parts perbillion, as set out in 40 CFR 50.11. 

### (I) 

### Connecticut primary and secondary ambient air quality standards for lead. The Connecticut primary and secondary ambient air quality [standard} standards for lead and its compounds[, measured as elemental lead is: 1.5 micrograms per cubic meter, maximum arithmetic mean averaged over three consecutive calendar months.] are 0.15 micrograms per cubic meter, as set out in 40 CFR 50.16. (m) C91l&sgtigat priBUlFf amhie&t tti£ (jHttlity sta&tlttFd ffiF diana. 

### Ths ConasstisYt

., primary ambieat air EJ:Ualfty stElflflaFEl fer dimdn is 1.0 pioografH:s psr sYl:>is

**mgt~r** 

### annual averagg,

**Fe~t** 

### the purposes of

### detefffttmftg eeH:lpliaHee vtttfl: -this 

### s1:oodard Fhs 

### so:133:FF.I:issioasr

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### uss a eon:eentration-ef--7.0

**piee~gratn5** 

### per ettbie 

### meter

**8-he~tu** 

### average. ['Nith:iR -tmee 

### yeafs ofthe effective date 

### ofthis subsection, 

### the

**ee~m:mi55ioner** 

### 5hail refer thi5 5tandmd for review and

**-'----cf'l4o~m"""nn:eflt--by** 

### the b:EW:afaol:ls 

### aiF pollutafl:t ad.:visory paael.] Sec. 5. Section 22a-174-28(a)(5) ofthe Regulations ofConnecticut StateAgencies is revised as follows: (5) "Control period" means the period from November 1 to the last day ofFebruary for the Central Control Area and the Southwestern Control Area ifa violation ofthe ambient air qualityPage 8 of 9 standard for carbon monoxide, [as listed in subsection 22a-174-24(h) ofthe Regulations of Connecticut State Agencies] as determined in accordance with the procedures specified in [Title 40 Code ofFederal Regulations Part 50] 40 CFR 50, occurs within such Control Area after November 1, 1998. Ifsuch violation occurs between December 1 and September 1, the Control Period for the Control Areain which suchviolation occurred begins the following November. If _such violation occurs between September 1 and December 1, the Control Period for the Control Area in which such violation occurred begins sixty (60) days after such violation for the initial Control Period and begins November 1 for each succeeding year.
Statement ofpurpose: The purpose ofthis proposal is to update the Department's ambient air quality standards as required bythe U.S. Environmental Protection Agency (EPA). EPAhas established ambient air quality standards for each ofsix criteriCl: pollutants at levels necessary to protect public health with an adequate margin ofsafety. EPA reviews each standard on a five-year cycle andupdates the standard ifwarranted bythe latest science. As the Department has notrevisited the Connecticut air quality standards in a number ofyears, many standards require a change inthe level ofthe standard in Connecticut's regulation. The proposal also clarifies that the ambient air quality standards are relevant to emissions from stationary sources regardless ofwhether the source is subject to an individual air quality permit or not. As some ofthe sources without permits are old and high emitting, a prohibition on individual source emissions inrelation to an ambient air quality standard is a useful enforcement tool, particularlyas many ofthe newer ambient standards look at e!!lissions over a short period oftime, such as a day or an hour. As the federal ambient

**ai~** quality standards apply to Connecticut independently, Connecticut's air isjudged against the most current and strict federal standards. Thus, the legal effect ofthese changes is consistency between state and federal ambient air quality standards, which is an elementrequired byEPA before EPA may fully approve Connecticut's State Implementation Plan as sufficient for the regulation ofrecently adopted federal standards.REGS-1 Rev. 09/2013 Page 9 of9 

### CERTIFICATION

• hereby certifythatthe above Regulation(s). · · ) is/are (check all thatapply) 

## 0 adopted 

### [8:1 amended 

## 0 repealed by this agency pursuant to the following authority (ies}: (complete
· aflthatapply) a. ConnecticutGeneral Statutes section(s) 22a-174. 22a-19B. b. Public Act Number(s)
__ .

. And I further certify 2) that Notice of Intentto adopt, amend, or repeal said regulation(s) was electronically submitted to the Secretary ofthe State on 8/28/13, and posted to the Secretary's regulations website on 8/29/13; 3) and that a public hearing regarding the proposed regulation(s) was held on 10/9113 or 

# 0 that no public hearing was held; 4) and that notice of Decision to Take Action on said regulations was electronically submitted to the Secretary ofthe State on January 8. 2014. and posted to the Secretary's regulations website on · 5)" and that said regulation(s} is/are EFFECTlVE 

# t8J When posted online bythe Secretary ofthe State. OR 

## D on (inse date)
__• 6) OFFICIAL TITLE, DULYAUTHORtZED
. DATE 

# Ce7MJvU



# 55~r,]>f£ff 

# t/J/11

. APPROVED bythe Atto DATE OFFICIAl TrrlE, DULYAUTHORIZED
Proposedregulations are DEEMEDAPPROVED y the Attorney Generalin accordance with CGS Section 4-169, as amended, ifthe AttorneyGeneral to give notice to the agencyofanylegalf!Jiu tciency within thirty (30) days ofthe receipt ofthe proposedregulation.
Review · APPROVED

## D inWHOLE orWITH [g{echnlcal corrections



## ~letions 

## 0 substitute pages 

# 0 DEEMED APPROVED, pursuant to CGS 4-170(c), as amended. 

# 0 Rejected



### witho~t Prejudice 

# 0 Disapproved, pursuant to CGS

**4~170(c),** as amended. By the legislative Regulation Review DATE Committee in accordance with CGS Section 4·170. as amended

**~'\1\arO,** 

### d.'$ 1

**~\** 

## L{ In accordancewith CGS Section 4-172, as amended by PA 13-247and PA 13-27 4t one certified paper copy and one electronic copy with agency head certification statement received on the date(s} specified below. DATE SIGNED (Secretaryof

**th~** State} BY
(ForSecretaryofthe State Use ONLY) SOTS file stamp! Date Posted to SOTS Regulations Website: 

# • I I ).1l•r-t.n **~** !;!f2r'1

**~** ::::!(;;\£ 

### === Date Electronic Copy Forwarded to the

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**·~** · Commission on Official Legal Publications:

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