SIP-Related Documents 

The U.S. Environmental Protection Agency (EPA) develops National Ambient Air Quality Standards (NAAQS) to protect human health and the environment.  DAQ is required to develop long-term planning documents such as State Implementation Plans (SIPs) to demonstrate how the NAAQS will be achieved, maintained, and enforced.  After an area reaches attainment, a Redesignation/Maintenance Plan is developed to demonstrate maintenance for at least the next 10-year period.  These Maintenance Plans also become part of the State SIP. DAQ also develops Transportation Conformity Plans, in collaboration with the Regional Transportation Commission of Southern Nevada (RTC) to address transportation conformity issues in Southern Nevada.

Currently, portions of Clark County are classified as nonattainment for Particulate Matter (PM₁₀), Carbon Monoxide (CO) and Ozone (O₃ – 1997 Standard).  Attainment SIPs for PM₁₀ and CO have been submitted to and approved by the U.S. EPA.

Particulate Matter (PM₁₀)

The Las Vegas Valley within Clark County is classified nonattainment for PM₁₀ pending the development and submittal of a maintenance plan and a request for redesignation to attainment.  DAQ submitted a State Implementation Plan in 2001, which explains how the area will attain the NAAQS for PM₁₀.  The document is the cumulative program of all pollution control strategies, control measures, emission inventories, attainment demonstration, and state statute and local rules implemented. Final U.S. EPA approval of the plan was effective July, 2004.

Subsequently, DAQ submitted a Milestone Achievement Report (MAR) in June 2007.   The MAR documents Clark County’s attainment of the 24-hour PM₁₀ NAAQS.  EPA made the determination that the Las Vegas Valley is in attainment with the PM10 NAAQS on August 3, 2010 (75 FR 45485), and will redesignate the area to attainment upon approval of the pending maintenance plan and request for redesignation.

The Natural Events Action Plan describes the actions and programs DAQ uses to mitigate the effects of high-wind events on levels of particulate matter in the Las Vegas and Apex Valleys.  The plan exceeds the current requirements of the March, 2007, EPA Exceptional Events Rule.

SIP Documents	Document Elements
Milestone Acheivement Report (2007)		Milestone Achievement Report (2007) – without Appendices App A – Monitoring Data App B – High Wind Events App C – Saturation Monitoring Study App D – Land and Road Soil Stabilization Study App E – Refined Emission Factors App F – Construction Inventory App G – RTP Chapter 5 App H – Proportional Rollback Model
Natural Events Action Plan (2005)		NEAP (without Appendices) App A – EPA Natural Events Policy App B – Geography and Climatic Summary App C – Public Health & Outreach Materials App D – Clark County Air Quality Regulations App E – Contracted Water Truck policy App F – Example High Wind Event Justification Package App G – Public Notice and Review App H – Public Comments and Responses
PM10 State Implementation Plan for Clark County (2001)		PM10 SIP Plan (without Appendices) App A - Design Value Determination App B - Emission Inventory Methodology App C - Estimation of Valley-Wide PM10 Emissions App D - PM10 Emissions Inventory of Sources Surrounding Monitoring Sites App E - Inventory Projections Methodology and Calculations App F - Control Measure Development Process App G – Air Quality Regulations and Section 94 Handbook App H – Clark County Health District Resolutions App I -  Letter from Nevada Department of Motor Vehicles and Public Safety App J - Street Sweeping Equipment and Paved Road Cleanup Programs App K – Rollback Methodology App L – Controlled Emission Inventory Development App M – Reasonable Further Progress Inventory of 2003 App N – Mobile Source Emissions Budget App O – Public Review Process App P – Comments Received App Q – Public Hearing Documentation App R – Residential Wood Combustion Control Measures
EPA Approval Notices		75 FR 45485: Determination of Attainment for PM10 for the Las Vegas Valley Nonattainment Area, NV 68 FR 2954 EPA Notice of Proposed Approval 69 FR 32273 EPA Notice of Approval EPA Fact Sheet for proposed approval of PM10 SIP EPA Technical Support Document

Carbon Monoxide (CO)

DAQ submitted a CO State Implementation Plan in 2000.  This plan describes the control measures and technologies to bring the Las Vegas Valley into compliance with the CO NAAQS.  A Revision of the SIP was submitted in 2005 to update the CO emissions budgets using the latest model approved by EPA for transportation conformity determinations (MOBIL6).  A Federal Register notice denoting EPA's determination of attainment for CO NAAQS within the Las Vegas Valley was issued in June 2005.  A CO Maintenance Plan and formal request for redesignation to attainment was submitted to the EPA in 2008 and was approved on September 27, 2010.

SIP Documents	Document Elements
CO Maintenance Plan and Redesignation Request (2008)	Maintenance Plan and Redesignation Request (2008) ( without Appendices) App A – Wintertime Gasoline Spec Study App B – Technical Support Document App C – Public Review Process NDEP Review of CO Maintenance Plan and Recommendations to EPA
EPA Approval Notices	75 FR 59090: EPA Redesignation Approval 75 FR 44734: EPA Redesignation Proposal EPA Fact Sheet for proposed final approval
Carbon Monoxide State Implementation Plan Revision (2005)	Carbon Monoxide State Implementation Plan Revision (without Appendices) App A - Technical Support Document App B - Carbon Saturation Study App C - Effectiveness of I&M App D - Airport Modeling Studies App E - RTC Support letter App F - Public Review Process
EPA Approval Notices	71 FR 26910 EPA Notice of Proposed Approval 71 FR 44587 EPA Notice of Approval EPA Fact Sheet for proposed approval of CO SIP Revision
Carbon Monoxide State Implementation Plan for the Las Vegas Valley (2000)	Carbon Monoxide State Implementation Plan for the Las Vegas Valley (without Appendices) App A – Emission Inventory App B – Transportation Documentation App C – Modeling Documentation App D – regulations and policies App E – Supplemental Technical Support Documentation
EPA Approval Notices	68 FR 4141 EPA Notice of Proposed Approval 69 FR 56351 EPA Notice of Approval EPA Fact Sheet for CO SIP EPA Technical Support Document

Ozone (O₃)

EPA made the determination that Clark County is in attainment with the 1997 Ozone NAAQS on March 29, 2011 (76 FR 17343).EPA will redesignate the area to attainment upon approval of the Ozone Redesignation Request and Maintenance Plan submitted to EPA Region IX in early April 2011. 

The Ozone Redesignation Request and Maintenance Plan is a formal request by DAQ to the U.S. EPA to redesignate the Clark County ozone nonattainment area to attainment for the 1997 8-hour ozone NAAQS.

An Ozone Early Progress Plan that provides the basis for establishing early transportation conformity budgets for the Clark County, Nevada, 8-hour Ozone nonattainment area was submitted to EPA in 2008, and approved in 2009.

SIP Documents		Document Elements
Ozone Redesignation Request and Maintenance Plan (2011) Entire Document			Ozone Redesignation Request and Maintenance Plan  (2011) - without Appendices App A – Technical Support Document App B – EPA AQS Design Value Report 2006-2009 App C – Documentation of the Public Review Process
EPA Approval Notices
Ozone Early Progress Plan (2008) - Entire document			Ozone Early Progress Plan (without Appendices) App A – Consolidated Emissions Inventory App B – Air Quality regulations App C – 2005 CCROPS Study App D – Public review Process
EPA Approval Notices	76 FR 17343: Determination of Attainment for the Clark County 8-Hour Ozone Nonattainment Area 74 FR 22738: Adequacy Status of Motor Vehicle Emissions Budgets in Submitted Early Progress Plan

Transportation Conformity Plans  

The Transportation Conformity Plan details consultation criteria, policies, and procedures that applicable local, state and federal agencies must follow when addressing transportation conformity issues within Clark County.  DAQ updated the plan in 2008. In July 2008, EPA issued a finding that the Transportation Conformity Plan fulfilled the requirements in 40 CFR Part 51, Appendix V. Subsequently, EPA issued a direct final rule in November 2008.

SIP Documents		Document Elements
Transportation Conformity Plan (2008) - Entire document
EPA Approval Notices	EPA Completeness Finding Letter (July 2008) Federal Register – Direct Final Rule (November 2008) Federal Register – Proposed Rule (November 2008) Federal Register – Technical Support Document for Proposed Rule (November 2008)

For more information or questions about SIP documents contact Rodney Langston (702) 455-1661 for particulate matter, Robert Tekniepe at (702) 455-4063 for CO and transportation conformity, and Jean-Paul Huys (702) 455-1684 for ozone.