State ofCalifornia AIR RESOURCES BOARD Approval and Submittal ofthe Town of Mammoth Lakes PM1o Maintenance Plan and Redesignation Request Resolution 14-27 September 18, 2014 Agenda Item: 14-7-2

WHEREAS, the Legislature in Health and Safety Code section 39602 has designated the State Air Resources Board (ARB or Board) as the air pollution control agencyfor all

.purposes setforth in federal law; WHEREAS, ARB is responsible for preparing the State Implementation Plan (SIP) for attaining and maintaining the national ambient airquality standards (NAAQS) as required by the federal Clean AirAct (the Act; 42 U.S.C. section 7401 et seq.), and to this end is directed by Health and Safety Code section 39602 to coordinate the activities ofall local and regional air pollution control and air quality managementdistricts (districts) necessaryto comply with the Act; WHEREAS, section 39602 ofthe Health and Safety Code also provides that the SIP shall include onlythose provisions necessaryto meetthe requirements ofthe Act; WHEREAS, ARB has responsibility for ensuring districts meettheir responsibilities underthe Act pursuantto sections 39002, 39500, 39602, and 41650 ofthe Health and Safety Code; WHEREAS, ARB is authorized by section 39600 ofthe Health and Safety Code to do such acts as may be necessaryfor the proper execution of its powers and duties; WHEREAS, sections 39515 and 39516 ofthe Health and Safety Code provide that any power, duty, purpose, function orjurisdiction ofthe Board may be delegated to the ARB Executive Officer as the Board deems appropriate; WHEREAS, the districts have primary responsibility for controlling air pollution from non-vehicular sources and for adopting control measures, rules, and regulations to attain the NAAQS within their boundaries pursuantto sections 39002, 40000, 40001, 40701,40702, and 41650 ofthe Health and Safety Code; WHEREAS, the Great Basin Unified Air Pollution Control District (District) was established pursuantto section 40150 ofthe Health and Safety Code as the air pollutionResolution 14-27 

### 2

control district responsible for carrying outthese responsibilities in Alpine, lnyo, and Mono Counties; WHEREAS, the Mammoth Lakes Planning Area (Mammoth Lakes) within Mono County was automatically designated as a "moderate" PM1o nonattainment area forthe 24-hour PM 10 standard of 150 j.Jg/m3 with an attainment date of December 31, 1994; WHEREAS, in December 1990, the District and the Town of Mammoth Lakes adopted the 1990Air Quality Management Plan (1990 Plan) to control emissions from residential wood combustion and road sanding; WHEREAS, the District submitted the 1990 Plan and subsequently-adopted plan amendments to ARB with requests that the 1990 Plan be approved and submitted to United States Environmental Protection Agency (U.S. EPA); WHEREAS, ARB submitted the 1990 Plan and subsequent amendments to U.S. EPA on September 11, 1991, and March 11, 1992, respectively; WHEREAS, U.S. EPA approved the 1990 Plan and amendments as afully approved revision to the California SIP on June 24, 1996; WHEREAS, implementation ofthe 1990 Plan reduced winter PM1o emissions to the extentthat an exceedance ofthe 24-hour PM 10 standard has not occurred since 1993 in Mammoth Lakes; WHEREAS, section 107(d)(3)(D) ofthe Act provides that a state may request U.S. EPA to redesignate an area from nonattainmentto attainmentforthe NAAQS; WHEREAS, section 107(d)(3)(E) ofthe Actsets forth the requirements which must be metfor U.S. EPAto redesignate an area from nonattainmentto attainment; WHEREAS, the District developed the Town of Mammoth Lakes PM1o Maintenance Plan and Redesignation Request (Maintenance Plan/Redesignation Request) to addressthe requirements ofthe Act; WHEREAS, consistent with section 107(d)(3)(E)(i) ofthe Act, the District demonstrated continued attainment in Mammoth Lakes with no violations ofthe PM1 0 NAAQS recorded since the 1991-1993 period, based on quality-assured federal reference monitoring method data from the local monitoring network; WHEREAS, consistent with section 107(d)(3)(E)(ii) ofthe Act, the 1990 Plan was approved by U.S. EPA on June 24, 1996, with respect to the requirements of section 11O(k) and other applicable requirements ofthe Clean AirAct; WHEREAS, consistentwith section 107(d)(3)(E)(iii) ofthe Act, the Maintenance Plan/Redesignation Request documentsthe changes in residential wood burning andResolution 14-27 

### 3

road sanding practices that resulted from implementation of Mammoth Lakes' town ordinances thatwere responsible for reductions in PM1oemissions and improvementsto PM 10 air quality in Mammoth Lakes between 1990 and 1993; WHEREAS, consistentwith section 107(d)(3)(E)(iv) ofthe Act, the District prepared the Maintenance Plan/Redesignation Request to documentthat PM10 peak-day emissions in Mammoth Lakes remain substantially below levels that would result in an exceedance ofthe NAAQS and conform with U.S. EPA guidance; WHEREAS, consistent with section 107(d)(3)(E)(v) ofthe Act, the District prepared the Maintenance Plan/Redesignation Request in partto meetthe applicable requirements ofsection 110 and Title I, part D ofthe Act; WHEREAS, consistent with section 176 ofthe Act, the District developed transportation conformity budgets for PM 10 using the most recent estimates ofemissions for 2012 and projections to 2030; WHEREAS, the District conducted a public hearing on May 5, 2014, after giving 30 day public notice ofthe Maintenance Plan/Redesignation Request availability for public review and comment prior to the hearing date; WHEREAS, atthe May 5, 2014, public hearing the District Board voted to: 1. Adopt the Maintenance Plan/Redesignation Request to fulfill the applicable requirements ofthe Actfor maintenance of an attainment area forthe PM1o NAAQS; and 2. Request a redesignation for Mammoth Lakes to attainment ofthe PM 10 NAAQS; WHEREAS, during the 30-day public comment period, the District modified thetext of the publicly-available draft Maintenance Plan/Redesignation Request, including portions devoted to transportation conformity budgets; WHEREAS, the District submitted the Maintenance Plan/Redesignation Requestto ARB as a revision to the SIP on May 22, 2014, in accordance with State and federal law; WHEREAS, ARB is providing a 30-day public comment period for the modified text related to the transportation conformity budgets; WHEREAS, on August 18, 2014, ARB staffcirculated for public review the proposed Maintenance Plan/Redesignation Request; WHEREAS, the California Environmental Quality Act requires that no projectwhich may have significant adverse environmental impacts be adopted as originally proposed if feasible alternatives or mitigation measures are available to reduce oreliminate such impacts;Resolution 14-27 4 WHEREAS, the Maintenance Plan/Redesignation Request contains already adopted regulations and rules thatwere subjectto environmental review at the time oftheir adoption, and any measure that may be developed or amended as a contingency provision will undergo environmental review at the time ofadoption; WHEREAS, the Board finds that: 1. California's air pollution control programs have successfully reduced PM10 ambient concentrations leading to PM 10 NAAQS attainment in Mammoth Lakes; 2. The Maintenance Plan/Redesignation Request complies with the requirements of section 107(d)(3)(E) ofthe Act; 3. The Maintenance Plan/Redesignation Request is necessaryfor U.S. EPAto redesignate Mammoth Lakes to attainmentforthe PM10 NAAQS; 4. The Maintenance Plan/Redesignation Request addresses current attainment and continued maintenance ofthe 24-hour PM 10 NAAQS through 2030; 5. The Maintenance Plan/Redesignation Request includes an attainment emission inventory; commitments by the District to continue operating the PM10 monitoring network; and a process to verify continued PM10 attainment; 6. The Maintenance Plan/Redesignation Request includes contingency provisions to assure prompt correction ofany post-redesignation violation ofthe PM 10 NAAQS; 7. The Maintenance Plan/Redesignation Request has identified PM10 emission budgets fortransportation conformityfor 2012 and 2030 based on current emissions and activity data, and the budgets are adequate to ensure continued maintenance ofthe PM10 NAAQS; 8. The Maintenance Plan/Redesignation Request relies entirely on adopted regulations to demonstrate continued maintenance; and WHEREAS, the Board furtherfinds thatARB staff has reviewed and considered the Maintenance Plan/Redesignation Request along with the comments presented by interested parties and thatARB stafffinds that the Maintenance Plan/Redesignation Request meets the requirements ofthe Act. NOW, THEREFORE BE IT RESOLVED that the Board hereby adopts the Maintenance Plan/Redesignation Request as a revision to the California SIP. BE IT FURTHER RESOLVED that the Board directs the Executive Officerto submitthe Maintenance Plan/Redesignation Request togetherwith the appropriate supporting documentation, to U.S. EPAfor approval as a revision to the California SIP.

### Resolution 14-27 

### 5

BE IT FURTHER RESOLVED that the Board directs the Executive Officerto work with the District and U.S. EPA and take appropriate action to resolve any completeness or approvability issues that may arise regarding the SIP submission. BE IT FURTHER RESOLVED thatthe Board authorizes the Executive Officerto include in the SIP submittal anytechnical corrections, clarifications, or additions that may be necessarytosecure U.S. EPA approval. BE IT FURTHER RESOLVED thatthe Board hereby certifies pursuantto 40 CFR section 51.102 thatthe Maintenance Plan/Redesignation Request was adopted after notice and public hearing as required by40 CFR section 51.102. I hereby certify thatthe above is a true and correct copy of Resolution 14-27 as adopted bytheAir Resources Board.

Tracy Jensen, Elekofthe Board