# Department of Environmental Quality

Toprotect, conserve andenhance the qualityofWyoming's environmentforthe benefitofcu",sntandfuture generations.

Matthew H. Mead, Governor August 19.2011



### Mr. James B. 

### Martin Regional Administrator USEPA Region 8 Mail Code: 8P-AR 1595 Wynkoop Street Denver, CO 80202-1129 

### RE: 110 Infrastructure SIP for 2006 

### PM2.5 NAAQS Dear Mr. Martin: John Corra, Director

Section I 1O(a)(l) ofthe Clean Air Act (CAA) requires that each state, after a new or 

### revised alional Ambient Air Quality Standard (NAAQS) is promulgated, review its State Implementation Plans (SIPs) to ensure that they meet the requirements ofthe "infrastructure clements" ofSection II0(a)(2) ofthe 

### eAA. The State ofWyoming updated the list of documentation required to demonstrate that the State has addressed all fourteen basic infrastructure clements. The list was then taken out for public notice beginning on July 16,2011. A public hearing was held on August 16,2011 in Green River, Wyoming. Afterreceiving one positive comment. the State ofWyoming has made a detcnnination that the PM2.S Infrastructure SIP contains all ofthe necessary provisions to address the requirements for the 2006 PM2.5 NAAQS. Ifyou have any queslions regarding this submittal, please feci free to contact Steven A. Dielrich, Air Quality Administrator, at 307-777-7391. Sincerely,

Director Department ofEnvironmental Quality

Enclosures: Highlighted 110 SIP Infrastructure SIP and Clean Copy ofII0 Infrastructure SIP

cc: Steven A. Dietrich, AQD Administrator Christine Anderson, AQD Carissa Krey. AQD

Herschler Building

. ADMINIOUTREACH ABAHOONEO MINES (301)111·1158 (301)**m~I-45** FAX 117·1882 FAX 117-&462 122 West 25th Street· Cheyenne, WY 82002

. http://deq.st8te.wy.us AIR QUAUTY INOUSTRIAL SITlNO lANO QUALITY saUD' HAZ. WASTE WATER QUALITY (307)117·7391 (307)117·7369 (301)771·7756 (307j717·7152 (307)777.7781 FAX711-$16 FAX 711--8937 FAX 117·5864 FAX 711·5973 FAX711·5973STATE OFWYOMING 110 SIP INFRASTR CTURE ELEMENTS (Reviewed July 201 I) 

### Emission limits and othercontrol measures: Section 11O(a)(2XA) requires SIPs to include enforceable emission limits and othercontrol measures, means ortechniques, schedules for compliance and otherrelated matters. Non-regulatory Document'! 1. Control Strategy Document a. Original State non-regulatory SIP document submitted to EPA on 1/28/72 

### b. Approved 

### by EPA 5/31/72; 37 FR 10842 2. Source Surveillance Document a. Original State non-regulatory SIP document submitted to EPA on 1/28/72 

### b. Approved 

### by EPA 5/31/72; 37 FR 10842 

### 3. Compliance Schedule Document a. Original State non·rcgulatory SIPdocument submitted to EPA on 1/28/72 

### b. Approved 

### by EPA 5/31/72; 37 FR 10842 Regula/oryDocuments 

### 1. Wyoming Air Quality Standards and Regulations, Section2, Definitions a. Original State regulations submitted 1/28/72 

### b. Approved 

### by EPA 5/31/72; 37 FR 10842 2. Wyoming Air Quality Standards and Regulations, Section 18, Diluting and concealing emiSSions 3. Original State regulations submiued 1/28/72 

### b. Approved 

### by EPA 5/31/72; 37 FR 10842 3. Wyoming Air Quality Standards and Regulations, Section 19, Abnormal conditions and equipment malfunction 3. Original State regulations submiucd 1/28/72 

### b. Approved 

### by EPA 5/31/72; 37 FR 10842 4. Wyoming Air Quality Standards and Regulations, Section 14, Control ofparticulate emiSSions 3. Original State regulations submitted 1/28/72 

### b. Approved 

### by EPA 5/31/72; 37 FR 10842 5. Wyoming Air Quality Standards and Regulations, Section 10, Nitrogen oxides a. Original State regulations submitted 1/28/72 

### b. Approved 

### by EPA 5131/72; 37 FR 10842 6. Wyoming Air Quality Standards and Regulations, Section 4, Sulfuroxides a. Original State regulations submitted 7/22/74, resubmitted 8/7/74 b. EPA approved via FRdate of6/10/75 7. Wyoming Air Quality Standards and Regulations, Section 12, Carbon monoxide a. Original State regulations submitted 1/28/72 

### b. Approved 

### by EPA 5/31/72; 37 FR 108428. Wyoming Air Quality Standards and Regulations, Section 9, Hydrocarbons a. Original State regulations submitted 1/28/72 b. Approved by EPA 5131172; 37 FR 10842 9. Wyoming Air Quality Standards and Regulations, Section4, Sulfuroxides 3. Original Stateregulations submitted 7/22/74, resubmitted 8/7/74 b. EPA approved via FR date of6110175 10. Wyoming Air Quality Standards and Regulations, Section 5, Sulfuric acid mist a. Original State regulations submitted 1/28/72 b. Approved by EPA 5/31/72; 37 FR 10842 11. Wyoming Air Quality Standards and Regulations, Section 10, Nitrogen oxides a. Original Statc regulations submittcd 1128/72 b. Approved by EPA 5/31/72; 37 FR 10842 12. Wyoming Air Quality Standards and Regulations, Section 25, SweetwaterCounty nonattainmcnt area particulate mattcrregulations a. Original State rcgulations submitted 

### 1/25/79 b. Approved by EPA 7/2/79; 44 FR 38473 13. Wyoming Air Quality Standards and Regulations, Section 13, Open burning restrictions a. Original State regulations submittcd 1/28/72 b. Approved by EPA 5/31/72; 37 FR 10842 14. Wyoming Air Quality Standards and Regulations, Section 15, Wood waste burners a. Original State regulations submitted 1128/72 b. Approved by EPA 5/31/72; 37 FR 10842 15. Wyoming Air Quality Standards and Regulations, Section 17, Motor vehicle pollution control a. Original State regulations submitted 1/28/72 b. Approved by EPA 5/31/72; 37 FR 10842 16. Chapter I, Section 3, Definitions a. Most recent State regulatory SIP document submitted to EPA 9/12/2003 b. EPA Final Federal Register 7/28/2004; 69 FR44965 17. Chapter I, Section 4, Diluting and concealing emissions a. Most rccent State regulatory SIPdocument submitted to EPA 9112/2003 b. EPA Final Federal Register7/28/2004; 69 FR44965 18. Chapter I, Scction 5, Abnonnal conditions and equipment malfunction a. Most recent Statc rcgulatory SIP documcnt submitted to EPA 911112008 b. EPA Final Federal Register4/1612010; 75 FR 19886 19. Chapter 3, Section 2, Emission standards for particulate mattcr a. Most reccnt State regulatory SIP document submitted. to EPA 

### 9/1212003 b. EPA Final Federal Register712812004; 69 FR44965 20. Chapter 3, Section 3, Emission standards for nitrogen oxides a. Mostrecent Stateregulatory SIP document submittedto EPA 911212003 b. EPA Final Federal Register712812004; 69 FR 44965 21. Chapter 3, Section4, Emission standards for sulfuroxides a. Most recent Stateregulatory SIP document submittedto EPA 

### 9/1212003 b. EPA Final Federal Register 7128/2004; 69 FR44965



### 222. Chaptcr3, Section 5. Emission standards for carbon monoxide a. Most recent Stateregulatory SIPdocument submittcd to EPA 9/1m003 b. EPA Final Federal Register7/28/2004; 69 FR44965 23. Chapter3, Section 6, Emission standards for volatile organic compounds a. Mostrecent Stateregulatory SIP document submitted to EPA 9/1m003 b. EPA Final Federal Register7/28/2004; 69 FR44965 24. Chapter4. Section 2, Existing sulfuric acid productionunits a. Most recent State regulatory SIP document submitted to EPA 911212003 b. EPA Final Federal Register 7/28/2004; 69 FR44965 25. Chapter4, Section 3, Existing nitric acid manufacturing plants a. Most recent Statc regulatory SIP document submitted to EPA 9/1212003 b. EPA Final Federal Register 7/28/2004; 69 FR 44965 26. Chapter 8, Section 2, Sweetwater County particulatematterregulations a. Most recent State regulatory SIP document submitted to EPA 9/12/2003 b. EPA Final Federal Register 7/28/2004; 69 FR44965 27. Chaptcr 8, Section 3, Conformity ofgeneral federal actions to state implementation plans a. Most recent State regulatory SIPdocument submittcd to EPA 9/1212003 b. EPA Final Federal Register7/28/2004; 69 FR44965 28. Chapter 10, Section 2, Open burning restrictions a. Most recent State regulatory SIPdocument submitted to EPA 9/1212003 b. EPA Final Federal Register7/28/2004; 69 FR44965 29. Chapter 10, Section 3, Wood wa'ite burners a. Most recent State regulatory SIPdocument submitted to EPA 9/1212003 b. EPA Final Federal Register 7/28/2004; 69 FR44965 30. Chapter 13, Section 2. Motorvehicle pollution control a. Most recent State regulatory SIPdocument submitted to EPA 9/12/2003 b. EPA Final Federal Register 7/28/2004; 69 FR44965 Ambient air qUlIlity monitoring/data system: Section 11 O(a)(2)(B) requires SIPs to include provisions to provide for establishment and operation ofambient airquality monitors, collecting and analyzing ambient airquality data, and making thesc data available to EPA upon rcqucst. Non-regu/"tory Documents I. Air Quality Surveillance Document a. Original State non-regulatory SIP document submitted to EPA on 1/28/72 

### b. Approved 

### by EPA 5/31/72; 37 FR 10842 2. AirQuality Surveillance Network Document a. State non-regulatory SIP document submitted to EPA on 8/26/81 

### b. Approved 

### by EPA 2/9182; 47 FR 5892 3. Implementation Plan for Lead a. Original Stalc non-regulatory SIP document submitted to EPA on 8/29/84 

### b. Approved 

### by EPA 10/11/84; 49 FR 39843



### 3RegulatoryDocuments 

### I. Wyoming Air Quality Standards and Regulations, Section 3, Particulates a. Original State regulations submitted 

### 1128/72 b. Approved by EPA 5131/72; 37 FR 10842 

### 2. Wyoming Air Quality Standards and Regulations, Section 10, itrogen oxides a. Original Stateregulations submitted 1128172 b. Approved by EPA 5131/72; 37 FR 10842 

### 3. Wyoming Air Quality Standards and Regulations, Section 4, Sulfuroxides a. Original State regulations submitted 1128172 b. Approved by EPA 5/31/72; 37 FR 10842 

### 4. Wyoming Air Quality Standards and Regulations, Section 12, Carbon monoxide a. Original State regulations submitted 

### 1/28/72 b. Approved by EPA 5/31/72; 37 FR 10842 

### 5. Wyoming Air Quality Standards and Regulations, Section 8, Photochemical oxidants 3. 

### Original State regulations submitted 1/28/72 b. Approved by EPA 5/31/72; 37 FR 10842 

### 6. Wyoming Air Quality Standards and Regulations, Section 6, Sulfation a. Original State regulations submittcd 1/28/72 b. Approved by EPA 5/31/72; 37 FR 10842 

### 7. Wyoming Air Quality Standards and Regulations, Section26, Ambientairquality standard for lead 

### a. Original State regulations submitted 

### 8129184 b. Approved by EPA 10/11/84; 49 FR 39843 

### 8. Chapter2, Section 2, Ambient standards for particulate mattcr a. Most recent State regulatory SIP document submitted to EPA 

### 9/1212003 b. EPA Final Federal Register7/28/2004; 69 FR44965 

### 9. Chapter2, Section 3, Ambient standards for nitrogen oxides a. Most recent Stateregulatory SIPdocument submitted to EPA 

### 9/1212003 b. EPA Final Federal Register 7/28/2004; 69 FR44965 

### 10. Chapter2, Section 4, Ambient standards lor sulfuroxides a. Most reccnt State regulatory SIPdocument submitted to EPA 

### 9/12/2003 b. EPA Final Federal Register 7/28/2004; 69 FR44965 

### II. Chapter2, Section 5, Ambient standards for carbon monoxide a. Most recent Slate regulatory SIP document submitted to EPA 

### 9/1212003 b. EPA Final Federal Register7/28/2004; 69 FR44965 

### 12. Chapter2, Section 6, Ambient standards for ozone a. Most recent State regulatory SIP documcnt submitted to EPA 

### 9/1212003 b. EPA Final Federal Register7/28/2004; 69 FR44965 

### 13. Chapter2, Section 8, Ambient standards for suspended sulfates a. Most recent Stateregulatory SIPdocument submitted to EPA 

### 9/1212003 b. EPA Final Federal Register7/28/2004; 69 FR44965 

### 14. Chapter2, Section 10, Ambient standards for lead a. Most recent Stateregulatory SIPdocument submitted to EPA 

### 9/1212003 b. EPA Final Federal Register 7/28/2004; 69 FR44965



### 4

### Program for enforcement ofcontrol measures: Section 11O(aX2XC) requires States to include a program providing for enforcement ofall SIP measures and the regulation of constructionofnewormodified stationary sources to meet prevention ofsignificantdeterioration (PSD) and nonattainment NSR requirements. Non-regulatory**DocumenJ.~** 

### 1. Legnl Authority Document a. Original Slate non-regulatory SIPdocument submitted to EPA on 1/28172 

### b. Approved by EPA 5/31/72; 

### 37 FR 10842 2. Source Surveillance Document a. Original State non-regulatory SIPdocument submitted to EPA on I128n2 

### b. Approved by EPA 5131/72; 37 FR 10842 3. Review ofNew Sources and Modifications Document a. Original State non-regulatory SIPdocument submitted to EPA on 1128n2 

### b. Approved by EPA 5/31/72; 

### 37 FR 10842 4. 3/3/08 Memorandum From CynthiaCody, EPA Region 8, clarifications regarding SIP 110 infrastructure submissions for PMu , 

### specifically addressing the current unavailability ofEPA rules or guidance on PM2.5 implementation through the PSD program RegulatoryDocuments 

### I. 1974 Wyoming Air Quality Standards and Regulations. Section21, Permit requirements forconstruction. modification and operation a. Original State regulations submitted 7!22174, 

### resubmitted 817n4 

### b. EPA approved via FRdate of6/10/75 

### 2. 1979 Wyoming Air Quality Standards and Regulations. Section24, Prevention of significant deterioration a. Original State regulations submitted 1/25n9 

### b. EPA approved 7/2/79;

### 44 FR 38473 3. Chapter6. Section 2, Permit requirements for construction. modification, and operation a. Mostrecent State regulatory SIP document submittedto EPA 9/12/2003 

### b. EPA Final Federal Register 7/28/2004; 

### 69 FR44965 4. Chapter6. Section 4, Prevention ofsignificantdeterioration a. Most recent State regulatory SIPdocument submitted to EPA 5/1012011 5. Chapter6, Section 13, onattainmentpennitrequirements a. Most recent Slate regulatory SIPdocument submitted to EPA 5/1012011 Interstate and international transport provisions: Section 110(a)(2)(D) requires SIPs to include provisions prohibiting any source orother type ofemissions activity in one State from contributing significantly to nonauainment. or interfering with maintenance, ofthe NAAQS in anotherState, or from interfering with measures required to prevent significant deterioration

# or airquality orto protect visibility in another State, as well as insuring compliance with applicable requirements ofsections 126 and liS.



### 5Non-regulatoryDocument I. Original Wyoming InterstateTransport SIP [ on-Regulatory] (per Section IIO(a)(2)(D)(i) ofthe CM) submitted to EPA on 513107, and consisting of: a. Memorandumdated 

### 5/3/07 from David A. Finley, AQD Administrator, to John V. Corra, DEQ Director b. Letterdated 5/3107from John V. Corra, DEQ Director, to Robbie Roberts, EPA Region 8 Regional Administrator c. Certification Page For State Implementation Plans ForThe Air Quality Division OfThe Department OfEnvironmental Quality; SIP Adopted by DEQ on 3115/07; DEQ Adoption ofSIPApproved by Governor Dave Freudenthal on 4/15/07 d. Memorandum dated

### 4/9107 from John V. Corra, DEQ Director, to Governor Freudenthal e. Lelterdated 

### 4/24/07 from Nancy Vehrofthe Office ofthe Attorney General to Dave Finley, AQD Administrator f. Public Notice ofAir Quality Advisory Board Meeting ofDecember 11,2006 g. Dates ofpublication ofPublic Notice in five Wyoming newspapers h. Sign-in sheet for attendees of 12111/06 Air Quality Advisory Board Meeting I. Air Quality Advisory Board Meeting Agenda j. Negative Declaration Demonstration 2. Approved by EPA 

### 5/812008; 73 FR 26019 RegulatoryDocument 1. Chapter6, Section 2, Pennitrequirements for construction, modification. and operation a. Most recent State regulatory SIPdocument submitted to EPA 

### 9/1212003 b. EPA Final Federal Register712812004; 69 FR44965 Adequate resources: Section 11O(a)(2)(E) requires States to provide for adequate personnel, funding, and legal authority under State law to carry out its SIP, and related issues. Non-regulatory Documents 1, Resources Document a. Original State non-regulatory SIPdocument submitted to EPA on 1/28/72 b. Approved by EPA 5/31/72; 37 FR 10842 2. Legal Authority Document 3. Original State non-regulatory SIPdocument submitted to EPA on 1/28/72 b. Approved by EPA 5/3 1/72; 37 FR 10842 RegulatoryDocument I. Chapter 1, Section 2, Authoritv a. Most recent State regulatory SIP document submitted to EPA 911212003 b. EPA Final Federal Register712812004; 69 FR44965 2. Wyoming Environmental Quality Act, Articles 1 and 2 (Chapter II, Title 35 ofthe Wyoming Statutes) Stationary source monitoring system: Section llO(a)(2)(F) requires States to establish a system to monitoremissions from stationary sources and to submitperiodic emissions reports.

6RegulatoryDocuments 

### I. 1979 Wyoming Air Quality Standards and Regulations, Section23, Continuous monitoring requirements forexisting sources a. Original State regulations submitted 1125179 b. EPA approved 7/2/79; 44 FR 38473 2. Chapter6, Section2, Pennit requirements forconstruction, modification, and operation a. Most recent State regulatory SIP document submittcd to EPA 9/1212003 b. EPA Final Federal Register7/28/2004; 69 FR44965 3. Chapter 7, Section 2, Continuous monitoring requirements for existing sources a. Most recent State regulatory SIP document submitted to EPA 9112/2003 b. EPA Final Federal Register 7/28/2004; 

### 69 FR44965 Emergency power: Section 110(a)(2)(0) requires States to provide for authority to address activities causing imminentand substantial endangennent to public health, including contingency plans to implement the emergency episode provisions in theirSIPs. Non.regulatorv Documents 

### 1. Emergency Episode Plan Document a. Original State non-regulatory SIPdocument submitted to EPA on 1128172 b. 

### Approved by 

### EPA 5/31/72; 

### 37 FR 10842 2. Emergency Episode Contingency Plan Document a. Original State non-regulatory SIPdocument submitted to EPA on 8126/81 b. 

### Approved by 

### EPA 2/9182;

### 47 FR 5892 3. 3/3/08 Memorandum From Cynthia Cody, EPA Region 8, clarifications regarding SIP 110 infrastructure submissions for PMzs, specifically addressing the current unavailability ofEPA rules or guidance on PM2.S implcmentation through emergency episode plans. As a Priority III area (as defined under40 CFR 51.151), thc State of Wyoming is nol required to submit an Emergency Episode Plan. RegulatoryDocuments 

### I. 1972 Wyoming Air Quality Standards and Regulations, Section 20, Airpollution emergency episodes a. Original State regulations submitted 1128172 b. 

### Approved by 

### EPA 5/31/72; 

### 37 FR 10842 2. Chapter 12, Section 2, Air pollutionemergency episodes a. Most recent State regulatory SIPdocument submitted to EPA 9/1212003 b. EPA Final Federal Register7/28/2004; 69 FR 44965 3. Wyoming Environmental Quality Act, Article I, Powerofthe directorto issue emergency orders (Section 35-11-115 ofthe Wyoming Statutes) Future SIP revisions: Section I1O(a)(2)(H) requires States to have the authority to revise their SIPs in response to changes in the NAAQS, availability ofimproved methods forattaining the NAAQS, orin response to an EPA finding that the SIP is substantially inadequate.

7Non.regulatory Documenl 

### I. Implementation Plan Reviews Document a. Original State non.regulatory SIPdocument submitted to EPA on4/30/81 

### b. Approved by EPA 4/19/83; 48 FR 16682 RegulmoryDocument I. 

### Wyoming Environmental Quality**Act~** 

### Article 1 (Chapter 11. Title 35 ofthe Wyoming Statutes) 2. Wyoming Environmental Quality Act, Article 2, Establishment ofStandards (Section 35- 11-202orthe Wyoming Statutes) Consultation with government officials: Section 110(a)(2)(J) requires States to provide a process for consultation with local governments and Federal Land Managers carrying out NAAQS implementation requirements pursuant to section 121 relating to consultation. NCJn·regulatorv Documenl 

### 1. Consultation Document a. Original State non-regulatory SIPdocument submitted to EPA on 1/25/79 b. Approved by EPA 7/2/79; 44 FR 38473 Public notification: Section II0(aX2)(J) further requires States to notify the public irNAAQS arc exceeded in an area and to enhance public awareness ofmeasures that can be 

### taken to prevent exccedances. Non-regulatoryDocumenl 

### 1. Public Notification ofAir Quality Document a. Original State non-regulatory SIPdocument submitted to EPA on 1/25/79 b. Approved by EPA 712/79; 44 FR 38473 PSI) and visibility protection: Section 110(3)(2)(J) also requires States lo meet applicable requirements ofpart C related to prevention ofsignificant deterionttion and visibility protection. Non.regulatory Documenl.\' 

### I. Wyoming State hnplcmentation Plan ForClass 1Visibility Protection Document a. Original State non·regulatory SIP document submittedto EPA on 9/6/88 b. Approved by EPA 2/15/89; 54 FR 6912 2. 3/3108 

### Memorandum From CynthiaCody, EPA Region 8, clarifications regarding SIP J

### 10 infrastructure submissions for PM2

### s. specifically addressing the current unavailability ofEPA rules orguidance on PMu 

### implementation through the PSD program RegulatoryDocuments 

### 1. 1979 Wyoming Air Quality Standards and Regulations, Section 24, Prevention of significantdeterioration a. Original State regulations submitted 1/25/79 b. EPA approved 7/2/79; 44 FR 38473



### 82. Chapter6, Section4, Prevention ofsignificantdeterioration a. Most recent Stateregulatory SIPdocument submitted to EPA 5/1012011

Air Quality modeling/dala: Section II0(a)(2)(K) requires that SIPs provide for performing air quality modeling for predicting effects on airquality ofemissions from any NAAQS pollutant and submission ofsuch datato EPA upon request. RegulatoryDocuments 1. 1974 Wyoming Air Quality Standards and Regulations, Section 21, Pennit requirements forconstruction, modification and operation a. Original State regulations submitted 7/22/74, resubmitted 8/7174 b. EPA approved via FRdate of6/1 0/75 2. 1979 Wyoming Air Quality Standards and Regulations, Section 24, Prevention of significant deterioration a. Original State regulations submitted 1/25179 b. EPA approved 7/2/79; 44 FR 38473 3. Chapter6, Section 2, Permitrequirements for construction, modification. and operation a. Most recent Slate regulatory SIPdocument submitted to EPA 9/1212003 b. EPA Final Federal Register 7/28/2004; 69 FR44965 4. Chapter6, Section 4, Prevention ofsignificantdeterioration a. Mostrecent Stateregulatory SIPdocument submitted to EPA 5/1012011 Permitting fees: Section 110(a)(2)(L) requires SIPs to require eaeh major stationary source to pay pcnnitting fees to coverthe costofreviewing, approving, implementing and enforcing 

### a pcnnit. RegulatoryDocuments I. 

### t993 Wyoming Air Quality Standards and Regulations, Section 21, Permit requirements forconstruction, modification, and operation a. State regulations submitted 11/12/93 b. EPA approved 11/29/94; 59 FR 60905 2. Chapter6, Section 2, Permit requirements forconstruction, modification, and operation a. Most recent State regulatory SIPdocument submitted to EPA 9/1212003 b. EPA Final Federal Register7/28/2004; 69 FR 44965 Consultation/participation by affccted local entities: Section 1IO(a)(2)(M) requires States to provide forconsultation and participation in SIP developmentby local political subdivisions affected by the SIP. Non-regulatorv Document I. Intergovernmental Cooperation Document a. Original State non-regulatory SIP document submitted to EPA on 1/28/72 b. Approved by EPA 5/31/72; 37 FR 10842

9