STATE OF COLORADO 

John W. Hickenlooper, Governor 

Christopher E. Urbina, MD, MPH, Executive Director and Chief Medical Officer 

COLORADO AIR QUALITY CONTROL COMMISSION 

http://www.cdphe.state.co.us 

4300 Cherry Creek Drive South 

OED-OLRA-A5 

Denver, Colorado 80246-1530 

Phone (303) 692-3100 

Fax (303) 691-7702 

TDD (303) 691-7700 

Colorado Department 

of Public Health 

and Environment 

May 11, 2012 

James B. Martin 

Regional Administrator 

US EPA Region VIII 

1595 Wynkoop Street 

Denver, Colorado 80202 

Dear Mr. Martin: 

The following action is submitted to EPA for final approval and incorporation into the Colorado 

State Implementation Plan (SIP) pursuant to 40 CFR Part 51, Appendix V, 2.1(a). One hard 

copy and a CD of the materials needed for your review of each action are included with this 

letter. 

• Steamboat Springs PM10 Maintenance Plan and the Air Quality Standards, Designations 

and Emission Budgets Regulation — The revised plan includes updated PM 10 monitoring 

data showing ongoing compliance with the federal PM10 standard. Given the ongoing 

compliance, no new control strategies are included in the plan. Updated mobile source 

emission inventories and a revised emission budget utilized for transportation planning 

are included in the revised plan. 

We look forward to your timely review and approval of this request. 

The Office of the Colorado Air Quality Control Commission may submit any additional 

technical support documentation or information that you may need for review directly to the 

EPA. 
James B. Martin 

May 28, 2012 

Page 2 of 2 

Should there be any questions regarding these materials, please contact the Air Quality Control 

Commission Office at 303-692-3478. 

Thank you. 

Sincerely, 

Christopher E. Urbina, MD, MPH 

Executive Director and Chief Medical Officer 

Colorado Department of Public Health and Environment 

cc. Martha Rudolph 

Mike Silverstein 

Mark Komp 
Air Quality Standards, Designations and Emission 

Budgets Regulation and 

Steamboat Springs PM1O Maintenance Plan 

ADMINISTRATIVE MATERIALS 

Copies of the following administrative materials are included in this submittal of revisions to 

the Air Quality Standards, Designations and Emission Budgets Regulation and Steamboat 

Springs PM 10 Maintenance Plan. Hearing held on December 15, 2011. 

• Hearing Notice and Proposed Language as Published in the CCR and on the 

Commission Website 40 CFR Part 51 Appendix V 2.10 

• Meeting Agenda where Public Hearing Occurred and Notice published in the Legal 

Ads of the Denver Post 40 CFR Part 51 Appendix V 2.10 

• Procedural Documents of the Commission (this includes the Agenda Item Control 

Sheet, the Memorandum of Notice, the Economic Impact Analysis) 

• Parties Hearing Documents (this includes a list of the parties, the parties prehearing 

statements and rebuttal statements, and any orders by the Commission - - do not 

include all the attachments from the parties) 

• EPA Comments 40 CFR Part 51 Appendix V 2.1(h) 

• Public Comments 40 CFR Part 51 Appendix V 2.1(h) 

• Adopted Statement of Basis, Specific Statutory Authority and Purpose 

• Adopted Language by the Commission (in redline & footer noting adoption date and 

page numbers) 

• State Implementation Plan Element Adopted by the Commission 40 CFR Part 51 

Appendix V 2.1(d) 

• Colorado Air Quality Control Commission Meeting Minutes 40 CFR Part 51 

Appendix V 2.1(g) 

• Legal Opinion of the Colorado State Attorney General 40 CFR Part 51 Appendix V 

2.1(c) and (e) 

• Regulation or Regulation Revisions as published in the Colorado Code of Regulations 

(this is the version that is published by Lexis Nexis) 40 CFR Part 51 Appendix V 

2.1 (b) 
Hearing Notice and Proposed Language 

as Published in the CCR 

and on the Commission Website 

40 CFR Part 51 Appendix V 2.10 

Includes: 

- Hearing Notice 

- Proposed revisions to Air Quality Standards, Designations and 

Emission Budgets Regulation 

- Proposed revisions to Steamboat Springs PM10 Maintenance Plan 

- Proposed revisions to the Technical Support Document 
STATE OF COLORADO 

John W. Hickenlooper, Governor 

Christopher E. Urbina, MD, MPH, Executive Director and Chief Medical Officer 

Dedicated to protecting and improving the health and environment of the people of Colorado 

COLORADO AIR QUALITY CONTROL COMMISSION 

http://www.cdphe.state.co.us 

4300 Cherry Creek Drive South, EDO-AQCC-A5 

Denver, Colorado 80246-1530 

Phone (303) 692-3100 

Fax (303) 691-7702 

TDD (303) 691-7700 

vir 

* 'R 18 76. 

Colorado Department 

of Public Health 

and Environment 

NOTICE OF PUBLIC RULEMAKING HEARING 

BEFORE THE 

COLORADO AIR QUALITY CONTROL COMMISSION 

Regarding proposed revisions to: 

Steamboat Springs PM10 Maintenance Plan and the 

Air Quality Standards, Designations and Emission Budgets Regulation 

SUBJECT: 

The Air Quality Control Commission will hold a rulemaking hearing to consider a proposed 

revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area. 

Approval of the associated documents by both the City of Steamboat Springs and Routt County 

is anticipated by December 2011. Additionally, a change to the "Air Quality Standards — Air 

Quality Standards, Designations and Emission Budgets" regulation is proposed to update the 

PM10 emission budget for the Steamboat Springs area. 

HEARING SCHEDULE: 

DATE: December 15, 2011 

TIME: 9:00 AM 

PLACE: Colorado Department of Public Health & Environment 

4300 Cherry Creek Drive South, Sabin Conference Room 

Denver, Colorado 80246 

The hearing may be continued at such places and time as the Commission may announce. Interested 

parties may contact the Commission Office at 303-692-3476 to confirm meeting dates and times. 

PUBLIC COMMENT: 

The Commission encourages all interested persons to provide their views either orally at the 

hearing or in writing prior to or at the hearing. The Commission especially solicits comments 

and analyses from persons whO will incur directly some cost or benefit from the proposed 

revisions. Public testimony will be taken as close to the start of the hearing as possible and 

during the hearing as necessary. Written and/or electronic submissions are requested, but not 

required to be submitted prior to the hearing to allow review prior to presentation at the hearing. 

Written and/or electronic submissions should be mailed to the Commission Office at least 14 

days prior to the hearing. 

Page 1 of 3 
PARTY STATUS: 

In order to obtain party status at the hearing, compliance with several requirements as defined in 

the Commissions Procedural Rules is necessary. A petition for party status must be filed by 

electronic mail with the Office of the Air Quality Control Commission no later than close of 

business on October 18, 2011. The petition must: 1) identify the applicant; 2) provide the name, 

address, telephone and facsimile numbers, and email address of the applicants representative; 

and 3) briefly summarize what, if any, policy, factual, and legal issues the applicant has with the 

proposal(s) as of the time offiling the application. Electronically mailed copies must also be 

received, by this same date, by the Division staff person and the Assistant Attorneys General 

representing the Division and the Commission identified below. 

Any person may petition the Commission to file documents in paper copy format if they are 

unable for any reason to comply with the requirements of 1.3.8(2) of the Commission's 

Procedural Rules. An original and a specified number of paper copies must be filed in the Office 

of the Air Quality Control Commission, Colorado Department of Public Health and 

Environment, 4300 Cherry Creek Drive South, Denver, Colorado 80246. Individuals may also 

obtain party status through the submittal of an initial alternative rule to the proposed rule. The 

submittal of an alternative proposal must be accompanied by an electronic copy of the initial 

alternative proposed rule and all other associated documents as required by the Commission's 

procedural rules and must be filed by electronic mail with the Office of the Commission by the 

date specified for party status requests. Initial alternative rules must also be filed by electronic 

mail with the Division staff person and with each of the Assistant Attorneys General. 

Theresa L. Martin 

Air Quality Control Commission 

4300 Cherry Creek Drive South, EDO-AQCC-A5 

Denver, CO 80246 

Theresa.Martin@state.co.us 

Attorney for the Commission 

Andrea Gelfuso-Goetz 

Attorney General's Office 

1525 Sherman Street, 7thFloor 

Denver, CO 80203 

Andrea.Goetz@state.co.us 

Christopher Dann 

Air Pollution Control Division 

4300 Cherry Creek Drive South, APCD-Bl 

Denver, CO 80246 

Christopher.Dann@state.co.us 

Attorneys for the Division 

Tom Roan 

Attorney General's Office 

1525 Sherman Street, 7thFloor 

Denver, CO 80203 

Tom.Roan@state.co.us 

Requests received beyond the above stated deadline shall only be considered upon a written 

motion for good cause shown. The Commission reserves the right to deny party status to anyone 

that does not comply with the Commission's procedural rules. 

STATUS CONFERENCE: 

A status conference will be held October 25, 2011 at 10:00 a.m., at the Department of Public 

Health and Environment to ascertain and discuss the issues involved, and to ensure that parties 

are making all necessary efforts to discuss and resolve such issues prior to the submission of 

prehearing statements. Attendance at this status conference is mandatory for anyone who has 

requested party status. 

Page 2 of 3 
PREHEARING CONFERENCE/PREHEARING STATEMENTS: 

Attendance at the prehearing conference is mandatory for all parties to this hearing. A 

prehearing conference will be held November 22, 2011 at 10:00 a.m. in the Commission 

Offices at 4300 Cherry Creek Drive South, Denver. All parties must submit by electronic mail a 

prehearing statement to the Commission Office by close of business November 15, 2011. In 

addition, electronically mailed copies of these documents must be delivered by that date to all 

persons who have requested party status. A copy of the prehearing statement must also be 

electronically mailed to the Division point of contact and each of the Assistant Attorneys General 

identified above by close of business November 15, 2011. Any revisions to the prehearing 

statement must be submitted to the Administrator of the Commission at the prehearing 

conference and by electronic mail to the Commission Office on the day of the prehearing 

conference. Any exhibit included in the prehearing statements will be electronically mailed to 

individual Commissioners for review prior to the hearing, provided the party files electronic 

copies of such exhibit. Rebuttals to the prehearing statement may be submitted to the 

Commission Office and all other parties by close of business November 29, 2011. 

EXCEPTIONS TO FILE DOCUMENTS BY ELECTRONIC MAIL: 

The Commission's Procedural Rules provide for an exception to file documents by electronic 

mail. If granted an exception to electronic filing pursuant to the provisions of 1.3.8(3) of the 

Commission's Procedural Rules, the applicant for party status shall file an original and fifteen 

copies of the prehearing statement in the Office of the Air Quality Control Commission, and 

shall also deliver copies to each other party, applicant for party status, the Assistant Attorneys 

General representing the Commission and Division, and the Division staff person for theproceedings, by electronic mail or as otherwise provided by the exception granted under 

Subsection 1.3.8(3), by that same day. 

STATUTORY AUTHORITY FOR THE COMMISSION'S ACTIONS: 

The Commission promulgates this regulatory change pursuant to its authority under § 25-7- 

105(1)(a)(I), C.R.S. to adopt a comprehensive state implementation plan that meets the 

requirements of the federal Clean Air Act. 

The rulemaking hearing will be conducted in accordance with Sections 24-4-103 and 25-7-110, 

110.5 and 110.8 C.R.S., as applicable and amended, the Procedural Rules of the Commission and 

as otherwise stated in this notice. This list of statutory authority is not intended as an exhaustive 

list of the Commission's statutory authority to act in this matter. 

Dated this 16th day of September 2011 at Denver, Colorado 

Colorado Air Quality Control Commission 

Michael Silverstein, Administrator 

Page 3 of 3 
PM10:2015 through 2021: 54 tons/day; 2022 

and beyond: 55 tons/day. 

Nitrogen Oxides:2015 through 2021: 70 

tons/day; 2022 and beyond: 56 tons/day 

Trading provisions: Trading of PM10 for NOx, or 

NOx for PM10 to adjust emission budgets for 

purposes of demonstrating transportation 

conformity shall be allowed using the emission 

trading formula as follows: 

For trades necessary to increase a primary 

PM10 budget, 15.0 tons/day of NOx will be 

taken from the NOx budget to increase the 

primary PM10 budget by 1.0 tons/day, a ration 

of 15 to 1. 

For trades necessary to increase a NOx budget, 

1.0 tons/day of primary PM10 will be taken from 

the primary PM10 budget to increase the NOx 

budget by 12.0 tons/day, a ratio of 1 to 12. 

Implementation of trading provisions: In the 

event the MPO cannot demonstrate consistency 

with the specific PM10 and NOx mobile source 

emission budgets, the trading provisions may be 

utilized only after the MPO has considered all 

reasonably available local control measures to 

meet the budgets. The MPO must demonstrate 

the need for trading through the usual 

consultation procedures for state implementation 

plan development delineated in Section IV (F) of 

AQCC Regulation Number 10, Criteria for 

Analysis of Conformity. 

If trading is utilized, the MPO shall include the 

following information in the transportation 

conformity determination: 

(1) The budget for primary PM10 and NOx 

for each required year of the conformity 

Denver 

Attainment/Maintenance 

Area (Modeling 

Domain) 

DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT 

Air Quality Control Commission 

AIR QUALITY STANDARDS, DESIGNATIONS AND EMISSION BUDGETS 

5 CCR 1001-14 

V.A. Budgets 

V.A.1. The following Motor Vehicle Emission Budgets shall be utilized to assess the conformity of 

Transportation Plans, TIPs, and where appropriate, Projects, for the applicable periods and 

geographic areas indicated: 
determination, before trading is employed; (2) 

The portion of the original budget to be used to 

supplement a wanting budget, for each required 

year for the conformity determination; (3) The 

increased budget that results from trading, along 

with relevant calculations, and (4) the resulting 

primary PM10 and NOx budgets for each 

required year of the conformity demonstration. 

The MPO shall then compare projected 

emissions to the adjusted PM10 and NOx motor 

vehicle emission budgets to demonstrate 

conformity. 

Denver Attainment Ozone Precursors (attainment/maintenance 

Maintenance Area area boundary) NOx 2002 and beyond 134 tpsd 

VOC 2002 and beyond 119 tpsd (tpsd = tons per 

summer day) Carbon Monoxide 

(attainment/maintenance area boundary) 2013 

through 2020: 1625 tons/day; 2021 and beyond: 

1600 tons/day. 

Denver Metro Regional Emissions Budgets 

Area/North Front Range NOx: 122.9 tons/day 8-Hour Ozone 

Nonattainment Area VOCs: 109.2 tons/day 

Southern Sub-Regional Emissions Budgets 

NOx: 102.4 tons/day 

VOCs: 89.7 tons/day 

Northern Sub-Regional Emissions Budgets 

NOx: 20.5 tons/day 

VOCs: 19.5 tons/day 

Aspen PM10 2023 and Beyond: 1,146 lbs./day 

Attainment/Maintenance 

Area 

Carlon City PM10 2020 and Beyond: 1,613 lbs./day 

Lamar (Modeling Area) PM10 2015 and Beyond: 7,534 lbs./day 

Pagosa Springs PM10 2021 and Beyond: 946 lbs./day 

(Modeling Area) 

Steamboat Springs 

(Modeling Area) 

PM10_2015 and Beyond: 21,773 lbs./day 

PM102015 and Beyond: 21,773 lbs./day 

Telluride (Modeling 

Area) 

PM10 2021 and Beyond: 1,008 lbs./day 
Longmont 

Attainment/Maintenance 

Area 

Carbon Monoxide 2010 through 2014: 43 

tons/day 2015-2019: 43 tons/day 2020 and 

Beyond: 43 tons/day 

Colorado Springs 

Attainment/Maintenance 

Area 

Carbon Monoxide 2010 and Beyond: 531 

tons/day 

Ft. Collins 

Attainment/Maintenance 

Area 

Carbon Monoxide 2005 through 2009: 99 

tons/day2010 through 2014: 98 tons/day2015 

and Beyond: 94 tons/day 

Greeley Area 

Attainment/Maintenance 

Area 

Carbon Monoxide 2005 through 2009: 63 

tons/day2010 through 2014: 62 tons/day2015 

and Beyond: 60 tons/day 

VIII. Statements of Basis, Specific Statutory Authority and Purpose 

VIII.BB. Steamboat Springs 

Adopted: December 15, 2011 

Basis and Purpose 

The purpose of this amendment is to update the PM10 emission budget for the Steamboat Springs area 

in connection with the adoption of the Revised PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area. 

Specific Statutory Authority 

The Commission promulgates this regulatory change pursuant to its authority under § 25-7-105(1)(a)(I), 

C.R.S. to adopt a comprehensive state implementation plan that meets the requirements of the federal 

Clean Air Act. 

Findings Pursuant to § 25-7-110.8 

The mobile source emission budgets are based on EPA-approved methods for calculating PM10 

emissions as required by federal regulations. All methodologies and information made available by 

interested parties have been considered. The emission budgets reduce the potential for air pollution by 

capping emissions from mobile sources. In adopting this rule, the Commission chose the most costeffective alternative. 
Revised PM10 Maintenance Plan for the 

Steamboat Springs Attainment/Maintenance Area 

Colorado Department 

of Public Health 

and Environment 

10-year Revision: 

In Draft, September 2011 

Original Redesignation Request and Maintenance Plan adopted by: 

• The U.S. Environmental Protection Agency, October 25, 2004 

(effective November 24, 2004) 

• Colorado Air Quality Control Commission, November 15, 2001 

Revision Prepared By: 

Air Pollution Control Division 

Colorado Department of Public Health and Environment 

4300 Cherry Creek Drive South 

Denver, Colorado 80246 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 1 
[Blank Page] 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 2 
TABLE OF CONTENTS 

TABLE OF CONTENTS 3 

SECTION 1: INTRODUCTION 4 

A. BACKGROUND 5 

1. PM10 National Ambient Air Quality Standard (NAAQS) 5 

2. Health and Welfare Effects of PM10 5 

3. Steamboat Springs Nonattainment Area Classification History 6 

4. Steamboat Springs Attainment/Maintenance Area Boundary 6 

Figure 1: Map of the Steamboat Springs Attainment/Maintenance Area 7 

B. ORGANIZATIONS INVOLVED IN PREPARING/APPROVING PLAN 8 

SECTION 2: PM10 ATTAINMENT HISTORY 9 

A. MONITORING HISTORY 9 

Table 1: Steamboat Springs PM10 Monitoring Record 9 

B. DESIGN VALUE DETERMINATION 9 

SECTION 3: STATE IMPLEMENTATION PLAN APPROVAL 11 

A. 1995 SIP ELEMENT 11 

B. 1996 SIP ELEMENT 11 

C. PM10 MAINTENANCE PLAN 11 

SECTION 4: PERMANENT AND ENFORCEABLE IMPROVEMENT IN AIR QUALITY 12 

A. OVERVIEW 12 

B. CONTROL MEASURES 12 

1. Woodburning Emission Controls 13 

2. Street Sanding Controls 13 

3. Street Sweeping Requirements 13 

4. Control of Emissions from Stationary Sources 13 

5. Federal Motor Vehicle Emission Control Program 14 

SECTION 5: MAINTENANCE PLAN 15 

A. REQUIREMENTS 15 

B. EMISSION INVENTORIES 16 

1. 2008 Base Year Emission Inventory 16 

Table 2: 2008 PM10 Base Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 17 

2. 2016 Interim Year Emission Inventory 17 

Table 3: 2016 PM10 Interim Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 17 

3. 2024 Maintenance Year Emission Inventory 18 

Table 4: 2024 PM10 Maintenance Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 18 

C. MAINTENANCE DEMONSTRATION 19 

D. PM10 EMISSION BUDGET 20 

E. MONITORING NETWORK/VERIFICATION OF CONTINUED ATTAINMENT 20 

F. CONTINGENCY PLAN 20 

1. Tracking 20 

2. Trigger and Response 21 

3. Potential Contingency Measure's 22 

G. SUBSEQUENT MAINTENANCE PLAN REVISIONS 22 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 3 
SECTION 1: INTRODUCTION 

This document is the second PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area. The U.S. Environmental Protection Agency (EPA) first 

approved a PM10 redesignation request and maintenance plan for the Steamboat 

Springs area on October 25, 2004 (69 FR 62210), which became effective on 

November 24, 2004. The redesignation request and maintenance plan was adopted by 

the Colorado Air Quality Control Commission on November 15, 2001. 

This second maintenance plan, as revised in 2011, revises the first maintenance plan 

adopted by the commission in 2001. The 2011 plan includes updated emission 

inventories and projections using the latest EPA-approved tools. This plan also revises 

the PM10 mobile source emission budget from 21,773 pounds per day in 2015 to 1,103 

pounds per day in 2024 and beyond. 

The City of Steamboat Springs, Routt County, and the state of Colorado request 

continuation of "attainment/maintenance" status for the Steamboat Springs PM10 

Attainment/Maintenance Area. The Steamboat Springs area originally was designated 

as nonattainment for the National Ambient Air Quality Standard (NAAQS) for particulate 

matter with an aerodynamic diameter of ten microns or less (PM10) in 1993 (effective 

January 20, 1994). The area presently is demonstrating attainment with the PM10 

NAAQS. The Maintenance Plan section of this document has been updated and will 

demonstrate that the area will be able to maintain compliance with the NAAQS through 

the year 2024. The benefits of maintaining attainment/maintenance status include: 

1. Areas that maintain attainment/maintenance status no longer carry the stigma 

associated with nonattainment of the NAAQS. 

2. Attainment areas will not become "serious" nonattainment areas even if a 

violation of the NAAQS occurs in the future. This means that specific control 

measures can be applied to address a violation without going through a rigorous 

federal process, where serious areas must implement mandatory control 

measures and be subject to numerous administrative activities. 

3. Prevention of Significant Deterioration (PSD) permitting requirements continue to 

replace New Source Review (NSR) permitting requirements for new and 

modified major stationary sources. These permitting requirements are important 

for large industrial facilities that currently are not located, nor likely to locate, in 

the Steamboat Springs area. 

This plan is designed to document and ensure continuing attainment and maintenance 

of the NAAQS for PM10 in the Steamboat Springs area. This document is intended to 

comply with requirements of the federal Clean Air Act (CAA), and with relevant 

procedures and policies of the U.S. Environmental Protection Agency (EPA). 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 4 
A. BACKGROUND 

1. PM10 National Ambient Air Quality Standard (NAAQS) 

In 1971, the EPA set NAAQS for several air pollutants, including total suspended 

particulates (TSP), defined as particles with an aerodynamic diameter of less than 40 

microns. In 1987, the EPA changed the TSP standards by setting NAAQS for PM10, 

defined as particles with an aerodynamic diameter of ten microns or less (PM10). The 

current PM10 NAAQS allow for a maximum 24-hour average concentration of 150 

ug/m3. The 24-hour PM10 NAAQS may not be exceeded more than once per year on 

average over any three-year period. 

There are both primary and secondary air quality standards. The primary standards are 

set to protect human health with a margin of safety to protect the more sensitive 

persons in the population like the very young, elderly and the ill. Secondary standards 

are set to protect property, materials, aesthetic values and general welfare. For PM10, 

the national primary and secondary standards are the same. The numerical levels of 

the standards are subject to change, based on new scientific evidence summarized in 

air quality criteria documents. In 2006, the EPA revoked the annual PM10 standard but 

retained the 24-hour average of 150 ug/m3 (71 FR 61144) for both the primary and 

secondary NAAQS. 

In general, demonstrating attainment requires collecting representative air monitoring 

data and using approved measuring instruments and procedures, with adequate quality 

assurance and quality control. Air quality measurements in the Steamboat Springs 

area satisfy this requirement, as shown in Section 2 (Table 1 — Steamboat Springs 

PM10 Monitoring Record). 

2. Health and Welfare Effects of PM10 

Particulate matter is the term given to tiny particles of solid or semi-solid material 

suspended in the atmosphere. PM10 refers to a subset of particulate matter 10 

micrometers in diameter and smaller. PM10 is inhalable. In the Steamboat Springs 

area, PM10 is created primarily from re-entrained road dust, carbon black (from 

automobile and diesel engines) and soot (from fireplaces and woodstoves). PM10 from 

these combustion sources contains a large percentage of elemental and organic 

carbon, which contributes to atmospheric haze and to health problems. 

Additional PM10 sources, to a lesser degree, include restaurant grills and aircraft. 

Epidemiological studies and laboratory studies of humans and animals indicate that 

particulate matter can be inhaled deeply into the respiratory system, resulting in 

aggravation of existing respiratory and heart diseases, damage to lung tissue, 

impairment of breathing and respiratory functions, alterations to the body's physical and 

immune system defenses, and even premature death. Many particles also are 

composed of compounds that are known or suspected human carcinogens. People 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 5 
most sensitive to particulate matter are the elderly, children, and those with chronic lung 

disease, cardiovascular disease, influenza, and asthma. 

The welfare effects of particulate air pollution are widespread. Chemical and 

photochemical reactions involving the particles may occur in the air, or once they have 

been deposited on environmental media or structures. Such soiling and acid deposition 

cause visibility degradation, climate changes, and damage to crops, natural vegetation, 

water bodies, and aquatic life. In addition, sculpture and architecture may be damaged 

or destroyed by particulate soiling and acid deposition. 

3. Steamboat Springs Nonattainment Area Classification History 

Because of observed problems with air particles, monitoring for PM10 began in 1985. 

Based upon numerous exceedances of the 24-hour PM10 NAAQS, the Steamboat 

Springs area was designated by the EPA as a "moderate" nonattainment area in 1993 

pursuant to section 107(d)(3)(B) of the Clean Air Act. 

4. Steamboat Springs Attainment/Maintenance Area Boundary 

The boundary for the Steamboat Springs PM10 Attainment/Maintenance Area is 

defined as follows: 

On the East: The Routt National Forest 

On the South: The southern border of sections 19, 20, 21, T4N, R84W of the 6 th 

 P.M. and the southern border of sections 23, 24, T4N, R85W of the 

6th P.M. 

Beginning at the southwestern corner of section 23, T4N, R85W of 

the 6thP.M., north along the western border of sections 23, 14, 11, 

T4N, R85W. Thence, along the ridge which bisects sections 35, 

36, 25, 24, 13, 14, 11, 12, 1, T5N, R85W, and sections 36, 25, 24, 

T6N, R85W. Thence, heading northwest along the ridge which 

bisects sections 23, 15, 10, 9, 4, T6N, R85W of 6 th P.M. Thence 

heading northeast along the ridge which bisects sections 33, 34, 

35, 36, 25 T7N, R85W and sections 30 and 19 of T7N, R84W. 

Thence, north along the N 1/2 of the western edge of section 19, to 

the NW corner of section 18, T7N, R84W. 

On the West: 

On the North: The northern boundary of sections 16, 17, 18 T7N, R84W of the 6 th 

P.M. 

A map illustrating the area boundary is shown in Figure 1. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 6 
Steamboat Springs PM-10 Attainment Area 4474,1.6.41.mtleo 

-1- 

Legend 

1- Col oradoAirports08nei 

* Point Sources 

CITY 

* PM 10 Monitor 

--H-+ RAILLIN ES 

Major Roads 

HIGHWAYS 

Local Roads 

City of Steam boat Springs 

NAME 

L ; Steamboat Springs Attainment Area 

0 1.26 2.5 II I 

5 Miles 

I 

I I 

Figure 1: Map of the Steamboat Springs Attainment/Maintenance Area 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 7 
B. ORGANIZATIONS INVOLVED IN PREPARING/APPROVING PLAN 

Preparation of this revised maintenance plan was a cooperative effort of the City of 

Steamboat Springs, Routt County, and the Air Pollution Control Division (APCD) of the 

Colorado Department of Public Health and Environment. The EPA, through its regional 

office in Denver, provided policy advice and technical assistance, and is responsible for 

final approval of this revised maintenance plan. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 8 
SECTION 2: PM10 ATTAINMENT HISTORY 

A. MONITORING HISTORY 

Monitoring for PM10 in Steamboat Springs began in 1985. Numerous exceedances of 

the 24-hour PM10 NAAQS were the basis for the Steamboat Springs area being 

designated as a "moderate" nonattainment area in 1993 (effective January 20, 1994). 

Table 1 lists the yearly maximum, yearly estimated exceedances and the 3-year 

average estimated exceedances for the Steamboat Springs monitoring site(s) for the 

10-year period from 2001 through 2010. The state of Colorado maintains a PM10 

monitor at 136 6thStreet in Steamboat Springs. 

Table 1: Steamboat Springs PM10 Monitoring Record 

Year 

Maximum 

Concentration 

(ug/m 3 ) 

Yearly 

Estimated 

Exceedances 

3-yr Average 

Estimated 

Exceedances 

2001 100 0 0 

2002 119 0 0 

2003 149 0 0 

2004 94 0 0 

2005 86 0 0 

2006 87 0 0 

2007 99 0 0 

2008 124 0 0 

2009 83 0 0 

2010 99 

B. DESIGN VALUE DETERMINATION 

The "design value" is the critical air quality value upon which the maintenance plan is 

based. The design value, and the conditions that occurred on the day which it was 

measured, are utilized to develop emission inventories and serve as a baseline for 

modeling ambient concentrations into the future. The selection of the design value 

used in this revised maintenance plan utilized the EPA's table look-up method from the 

EPA's "PM10 SIP Development Guideline" document. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 9 
Based on the number of samples collected during the 2008 - 2010 period (999), the 

third highest concentration is the design value, according to this guidance. The three 

highest concentrations measured during the period 2008 -2010 are as follows: 

** 124 ug/m3 — February 18, 2008 

** 111 ug/m3 — February 20, 2008 

** 99 ug/m3 — February 3, 2010 

Consequently, the design value used for this revised maintenance plan is 99 ug/m3. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 10 
SECTION 3: STATE IMPLEMENTATION PLAN APPROVAL 

The following presents a brief summary of the development and the approval of the 

Steamboat Springs PM10 Nonattainment State Implementation Plan (SIP) Element. 

A. 1995 SIP ELEMENT 

The first Steamboat Springs SIP Element was adopted by the Colorado Air Quality 

Control Commission (AQCC) in September 1995. The control measures included: 1) 

local restrictions on woodburning devices, 2) specifications for street sanding materials 

(no more than 1% fines allowed), and 3) street sweeping requirements on Lincoln 

Avenue (once after each sanding event). The plan also included monitoring data, 

emission inventories, and dispersion modeling which demonstrated attainment of the 

PM10 NAAQS by December 1999 and continuing through December 2002. The EPA 

did not approve this SIP Element at the request of the state due to revisions to control 

measures and modeling that occurred before EPA could take action on the plan. 

B. 1996 SIP ELEMENT 

A new Steamboat Springs PM10 SIP Element was adopted by the AQCC in October 

1996. The control measures were revised to include: 1) local restrictions on 

woodburning devices, 2) specifications for street sanding materials (no more than 2% 

fines allowed), 3) street sweeping requirements on Lincoln Avenue (four times after 

each sanding event), and 4) street sand reductions of 10% on state highways. The plan 

also included revised monitoring data, emission inventories, and dispersion modeling 

which demonstrated attainment of the PM10 NAAQS by December 1999 and 

continuing through December 2002. In addition, contingency measures (additional 

street sweeping if the area violated the NAAQS and an emergency episode plan 

(suspension of open burning, voluntary wood and coal burning curtailment, and 

voluntary driving reductions if a NAAQS exceedance was expected) were adopted. This 

SIP Element was approved by the EPA on December 31, 1997 (62 FR 68188). 

C. PM10 MAINTENANCE PLAN 

The Colorado Air Quality Control Commission approved the Steamboat Springs PM10 

Maintenance Plan on November 15, 2001. The EPA subsequently approved the plan 

on October 25, 2004, which became effective on November 24, 2004. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 11 
SECTION 4: PERMANENT AND ENFORCEABLE IMPROVEMENT IN 

AIR QUALITY 

The state of Colorado must demonstrate, based on Section 107(d)(3)(E) of the Clean 

Air Act, that the improvement in air quality leading to attainment and continued 

compliance with the NAAQS is based on permanent and enforceable measures, and 

that the reductions are not the result of temporary reductions in emissions or unusually 

favorable meteorology. 

A. OVERVIEW 

It is reasonable to attribute the continued attainment of the PM10 NAAQS in the 

Steamboat Springs Attainment/Maintenance Area to emission reductions that are 

permanent and enforceable. These emission reductions are the result of local, state, 

and federal actions, not economic factors or unusual meteorology. 

Economic conditions are not responsible for improved ambient levels in the Steamboat 

Springs Attainment/Maintenance Area. It is assumed that growth in population and tax 

revenue are indicators of increased activities that cause increased PM10 emissions and 

the potential for elevated PM10 concentrations. Information obtained for the City of 

Steamboat Springs shows that, during the period 2000 through 2007, general sales and 

use revenues increased by 71.21 percent, while Routt County population increased by 

16.85 percent over the same period. During this period, attainment of the PM10 

NAAQS was demonstrated with no exceedances recorded. 

Favorable meteorology also is an unlikely reason. Although winter and spring 

meteorological conditions are highly variable in mountain settings, there is no evidence 

to suggest that meteorological conditions experienced in the 2000s have not been 

"typical" (though it is difficult to make concrete conclusions based on short-term 

meteorological records). Because there has not been a violation of the PM10 NAAQS 

in Steamboat Springs since 1996, the Air Pollution Control Division concludes that the 

good air quality in the Steamboat Springs area is the result of the implementation of 

emission reduction measures, not meteorological fluctuations. 

B. CONTROL MEASURES 

The following control measures resulted in the area's attainment of the PM10 NAAQS, 

and these measures should ensure continued maintenance of the PM10 NAAQS 

through the year 2024, which is the duration of the maintenance period. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 12 
1. Woodburning Emission Controls 

The City of Steamboat Springs and Routt County have adopted local ordinances and 

resolutions that limit the number and types of woodburning devices in new construction 

in the Steamboat Springs area. Installation of new solid fuel burning devices is limited 

to one approved device for any building. These requirements were adopted locally in 

the late 1980s and early 1990s and included in state regulation in 1995 {Section VIII.E. 

of the "State Implementation Plan-Specific Regulatons for NonattainmentAttainment/Maintenance Areas (Local Elements)}. The rule was approved by the U.S. 

EPA in 1997. The requirements will remain part of state regulation and the federal State 

Implementation Plan (SIP). 

2. Street Sanding Controls 

There is a requirement that any user that applies street sanding materials in the 

Steamboat Springs Attainment/Maintenance Area must use materials containing less 

than two percent fines, except on U.S. Highway 40 from the junction of U.S. Highway 

131 toward Rabbit Ears Pass. This requirement was adopted in 1996 and approved by 

the U.S. EPA in 1997, and is defined in detail in Section VIII.B. of the {State 

Implementation Plan-Specific Regulations for Nonattainment-Attainment/Maintenance 

Areas (Local Elements)}. The requirement will remain part of state regulation and the 

federal SIP. 

3. Street Sweeping Requirements 

There are street sweeping requirements for a defined section of Lincoln Avenue 

(Highway 40 in Steamboat Springs). Beginning with the effective date of the U.S. EPA's 

approval of the initial maintenance plan (November 24, 2004), street cleaning using 

vacuum sweepers or any other sweepers with equal efficiency must occur two times 

within the four-day period of the roadways becoming free and clear of snow and ice 

following each sanding deployment use. These requirements are defined in detail in 

Section VIII.D. of the {State Implementation Plan-Specific Regulations for 

Nonattainment-Attainment/Maintenance Areas (Local Elements)}. The requirements will 

remain part of state regulation and the federal SIP. 

4. Control of Emissions from Stationary Sources 

The state's comprehensive permit rules limit emissions from any new source that may, 

in the future, locate in the Steamboat Springs area. These rules include: 1) CAQCC 

Regulation No. 3, "Air Pollution Emission Notices, Construction Permits and Fees, 

Operating Permits, and Including the Prevention of Significant Deterioration," 2) the 

"Common Provisions" regulation, and 3) CAQCC Regulation No. 6, "standards for 

Performance for New Stationary Sources." 

The Common Provisions, and Parts A and B of CAQCC Regulation No. 3, already are 

included in the SIP. CAQCC Regulation No. 6 implements the federal standards of 

performance for new stationary sources. As was the case with the initial maintenance 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 13 
plan, this revised maintenance plan makes no changes to these regulations. This 

reference to CAQCC Regulation No. 6 shall not be construed to mean that this 

regulation is included in the SIP. 

Emissions of PM10 from new or modified major stationary sources are controlled under 

CAQCC Regulation No. 3's nonattainment area New Source Review (NSR) permitting 

requirements. The NSR provisions require all new and modified major stationary 

sources to apply emission control equipment that achieves the "lowest achievable 

emission rate" (LAER) and to obtain emission offsets from other stationary sources of 

PM10. The PSD requirements are a relaxation from the NSR requirements, as LAER 

becomes the less stringent "Best Available Control Technology" (BACT), and offsets 

are not required. The application of these provisions is possible, but not foreseen, in the 

Steamboat Springs area. 

It should be noted that significant additional controls at both the Tri-State Generation 

and Transmission Association's Craig Generating Station and the Xcel Energy Hayden 

Generating Station that are part of the Colorado Visibility and Regional Haze State 

Implementation Plan will be installed during the effective period of this revised plan. 

5. Federal Motor Vehicle Emission Control Program 

The Federal Motor Vehicle Emission Control Program has reduced PM10 emissions 

through a continuing process of requiring diesel engine manufacturers to produce new 

vehicles that meet tighter and tighter emission standards. As older, higher-emitting 

diesel vehicles are replaced with newer vehicles, PM10 emissions in the Steamboat 

Springs area will be reduced. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 14 
SECTION 5: MAINTENANCE PLAN 

A. REQUIREMENTS 

Section 107(d)(3)(E) of the Clean Air Act (CAA) provides that, for an area to be 

redesignated to an attainment classification, the U.S. EPA must fully approve a 

maintenance plan which meets the requirements of CAA Section 175A. The 

maintenance plan will constitute a SIP revision and must provide for maintenance of the 

relevant NAAQS in the area for at least ten years after redesignation. The EPA first 

approved a PM10 redesignation request and maintenance plan for the Steamboat 

Springs area on October 25, 2004 (69 FR 62210), which became effective on 

November 24, 2004. 

An additional requirement (Section 175A(d)) is the submittal of a SIP revision eight 

years after the original redesignation request/maintenance plan is approved that 

provides for maintenance of the NAAQS for an additional ten years following the first 

ten-year period. The state of Colorado has satisfied this commitment by submitting this 

revised maintenance plan as required by the CAA and EPA requirements. 

Section 175A further states that the plan shall contain such additional control measures 

as necessary to ensure maintenance. All current nonattainment area control measures 

shall remain in place, except for the most stringent NSR stationary source permitting 

requirements (see Section 4.B.4.). This maintenance plan revision shall contain a 

contingency plan to ensure the prompt correction of any unforeseen violation of the 

PM10 NAAQS. Failure to maintain the NAAQS and triggering of the contingency plan 

will not necessitate a revision of the SIP Element, unless required by the EPA 

Administrator, as stated in CAA Section 175A(d). 

The provisions that are addressed in this maintenance plan revision include emission 

inventories (for a base year, an interim year and a maintenance year), a maintenance 

demonstration, an emission budget, an approved monitoring network, verification of 

continued attainment, and a contingency plan. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 15 
B. EMISSION INVENTORIES 

The emission inventories below include the 2008 base year, the 2016 interim year and 

the 2024 maintenance year. These inventories reflect the base and projected 

conditions in the Steamboat Springs Attainment/Maintenance Area, and account for the 

emission control measures that were adopted as part of the original redesignation 

request and the previous 10-year maintenance plan. Unlike the previous Steamboat 

Springs plan where the emission inventories were based on a grid system of the 

attainment/maintenance area, the updated emission inventories for 2008, 2016 and 

2024 are based on a number of EPA-approved emission modeling methods that are 

detailed in the Technical Support Document. Consequently, there are significant 

differences between the emission inventories in the previous plan and this revised and 

updated PM10 maintenance plan. 

1. 2008 Base Year Emission Inventory 

The 2008 Base Year Emission Inventory for the Steamboat Springs 

Attainment/Maintenance Area is presented below. This updated emission inventory 

incorporates the most current estimates for the following 10 source categories: 

• Commercial Cooking 

• Construction 

• Fuel Combustion 

• Highway Vehicles 

• Non-Road 

• Paved/Unpaved Road Dust 

• Point Sources 

• Railroad 

• Structure Fires 

• Woodburning 

The mobile source inventory (paved/unpaved road dust and highway vehicles) has 

been updated to reflect the following: 

• Latest traffic (VMT) estimates from the Colorado Department of Transportation 

• Revised emission factors and methods for determining paved road emissions 

• Road paving of unpaved roads that has occurred in the area 

• Vehicle exhaust emissions based on most up-to-date fleet mix 

All emission estimates were prepared by using EPA-approved methods and assigned to 

the area comprising the Steamboat Springs Attainment/Maintenance Area. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 16 
Table 2 presents the 2008 PM10 Base Year emission estimates for each source 

category in tons per year and pounds per average day. 

Table 2: 2008 PM10 Base Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 

Source Category 2008 PM10 [tons/year] 2008 PM10 [lbsiday] 

Commercial Cooking 2.92 16.6 

Construction 640.58 3509.7 

Fuel Combustion 1.46 8.6 

Highway Vehicles 25.55 140.5 

Non-Road 16.43 89.6 

Point Sources 33.95 185.1 

Railroad 0.73 3.6 

Road Dust 121.18 663.4 

Structure Fires 0.00 0.7 

Woodburning 87.24 478.0 

Totals: 930.02 5095.9 

2. 2016 Interim Year Emission Inventory 

Table 3 presents the 2016 PM10 Interim Year emission estimates for each source 

category in tons per year and pounds per average day. 

Table 3: 2016 PM10 Interim Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 

Source Category 2016 PM10 [tons/year] 2016 PM10 [lbs/clay] 

Commercial Cooking 3.65 20.5 

Construction 789.68 4326.4 

Fuel Combustion 1.83 10.6 

Highway Vehicles 31.94 175.1 

Non-Road 12.60 68.6 

Point Sources 41.80 228.2 

Railroad 0.92 4.5 

Road Dust 142.17 778.5 

Structure Fires 0.19 0.85 

Woodburning 107.50 589.3 

Totals: 1131.87 6202.4 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 17 
3. 2024 Maintenance Year Emission Inventory 

Table 4 presents the 2024 PM10 Maintenance Year emission estimates for each 

source category in tons per year and pounds per average day. 

Table 4: 2024 PM10 Maintenance Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 

Source Category 2024 PM10 [tons/year] 2024 PM10 [lbs/day] 

Commercial Cooking 4.38 24.4 

Construction 938.78 5143.1 

Fuel Combustion 2.19 12.6 

Highway Vehicles 38.33 209.6 

Non-Road 8.76 47.5 

Point Sources 49.64 271.3 

Railroad 1.10 5.3 

Road Dust 163.16 893.6 

Structure Fires 0.37 1.0 

Woodburning 127.75 700.5 

Totals: 1333.71 7308.8 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 18 
C. MAINTENANCE DEMONSTRATION 

This maintenance plan revision provides for continued maintenance of the 24-hour 

PM10 NAAQS through the year 2024, the 20-year period after the original redesignation 

request and maintenance plan was approved by the U.S. EPA in 2004. Because there 

have never been any exceedances of the annual PM10 NAAQS in Steamboat Springs, 

an analysis for maintenance of the annual standard was not prepared for the original 

redesignation request and maintenance plan. The EPA subsequently revoked the 

annual standard in 2006. 

A design day concentration of 99 ug/m3 has been selected as a conservative value 

that represents the third-highest 24-hour maximum PM10 value recorded in Steamboat 

Springs during 2008-2010. This 99 ug/m3 concentration occurred on February 3, 2010. 

No reduction for background values has been taken into account for the design day 

value, making the 99 ug/m3 a conservative estimate of PM10 ambient air 

concentrations in Steamboat Springs. The design value likely overstates the actual 

amount of PM10. 

The emission inventory data presented in this document is used to determine the 

growth in PM10 emissions from the 2008 base year to the 2024 maintenance year. 

The emission inventory shows an increase in PM10 from 5,095.9 pounds per day in 

2008 to 7,308.8 pounds per day in 2024. 

This represents an increase of 43.4 percent in emissions: 

7308.8/5095.9 = 1.434, or 43.4 percent. 

The design day concentration of 99 ug/m3 of PM10 is then increased 43.4 percent to 

"roll forward" to the 2024 attainment year. 

This roll-forward modeling results in a 2024 concentration of approximately 142 ug/m3: 

99 ug/m3 x 1.434 = 142 ug/m3 

Since 142 ug/m3 is below the 150 ug/m3 standard, maintenance is demonstrated 

through 2024. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 19 
D. PM10 EMISSION BUDGET 

Federal "transportation conformity" regulations provide for the use of mobile source 

emission budgets in making conformity determinations in the area. The emission 

budget serves as a ceiling on mobile source emissions that federally funded or 

approved transportation projects must comply or conform. 

This maintenance plan revision establishes a mobile source PM10 emission budget for 

the Steamboat Springs Attainment/Maintenance Area of 1,103 lbs/day for 2024 and 

beyond. This budget is the total of the 2024 mobile source PM10 emissions (see 

Section 5.B.3. above), which includes PM10 emissions from highways and 

paved/unpaved road dust. 

This budget has been adopted in the AQCC's "Air Quality Standards - Air Quality 

Standards, Designations and Emissions Budgets" regulation. 

E. MONITORING NETWORK/VERIFICATION OF CONTINUED 

ATTAINMENT 

The Air Pollution Control Division has monitored ambient PM10 concentrations in the 

Steamboat Springs area since 1985. The division has operated, and will continue to 

operate, the Steamboat Springs PM10 monitoring network in full accordance with the 

federal provisions of 40 CFR Part 58 and the EPA-approved Colorado Monitoring SIP 

Element. The division also will analyze the monitoring data to verify continued 

attainment of the PM10 NAAQS. This information will provide the necessary 

information to determine whether the Steamboat Springs area continues to attain the 

PM10 NAAQS. Detailed information regarding the state's monitoring efforts and 

historical monitoring data can be found in Section 2 of this document. 

F. CONTINGENCY PLAN 

Section 175(A)(d) of the Clean Air Act requires that the maintenance plan contain 

contingency provisions to assure that the state will promptly correct any violation of the 

PM10 NAAQS that may occur after the redesignation of the area to attainment. The 

EPA's redesignation guidance notes that the state is not required to have fully adopted 

contingency measures that will take effect without further action by the state. However, 

the contingency plan should ensure that contingency measures are adopted 

expediently once the need is triggered. The primary elements of the contingency plan 

involve the tracking and triggering mechanisms to determine when contingency 

measures would be needed, and a process for implementing appropriate control 

measures. 

1. Tracking 

The tracking plan for the Steamboat Springs area will consist of monitoring and 

analyzing PM10 concentrations. In accordance with 40 CFR Part 58, Colorado will 

continue to operate and maintain the Steamboat Springs PM10 monitoring network. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 20 
2. Trigger and Response 

Triggering of the contingency plan does not automatically require a revision of the SIP 

nor is the area necessarily redesignated once again to nonattainment. Instead, the 

state normally will have an appropriate timeframe to correct the violation with 

implementation of one or more adopted contingency measures. In the event that 

violations continue to occur, additional contingency measures will be adopted until the 

violations are corrected. 

Upon notification of a PM10 NAAQS exceedance, the Air Pollution Control Division and 

local government staff in the Steamboat Springs area will develop appropriate 

contingency measure(s) intended to prevent or correct a violation of the PM10 

standard. Information about historical exceedances of the standard, the meteorological 

conditions related to the recent exceedance(s), and the most recent estimates of 

growth and emissions will be reviewed. The possibility that an exceptional event 

occurred also will be evaluated (notification to the EPA and to the local governments in 

the Steamboat Springs area of any exceedance generally will occur within 30 days, but 

no later than 45 days). This process will be completed within six months of the 

exceedance notification. 

If a violation of the PM10 NAAQS has occurred, a public hearing process at the state 

and local level will begin. If the AQCC agrees that the implementation of local 

measures will prevent further exceedances or violations, the AQCC may endorse or 

approve of the local measures without adopting state requirements. If, however, the 

AQCC finds locally-adopted contingency measures to be inadequate, the AQCC will 

adopt state-enforceable measures as deemed necessary to prevent additional 

exceedances or violations. Contingency measures will be adopted and fully 

implemented within one year of a PM1 0 NAAQS violation. Any state-enforceable 

measures will become part of another revised maintenance plan, submitted to the 

Colorado Legislature and the EPA for approval. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 21 
3. Potential Contingency Measures 

The APCD and local government staff may choose one or more of the following 

contingency measures to recommend to local officials and the AQCC for consideration. 

Contingency measures will be selected that quickly bring the area back into compliance 

with the PM10 NAAQS and that specifically meet the needs of the Steamboat Springs 

area. It is likely that no federal or state monies will be available to fund the 

implementation of the selected contingency measure(s). Most, if not all, of the costs 

will be borne by local citizens and governments, local businesses, and state 

government agencies. 

• Increased street sweeping requirements 

• Road paving requirements 

• More stringent street sand specifications 

• Voluntary or mandatory woodburning curtailment 

• Bans on all woodburning 

• Expanded, mandatory use of alternative de-icers 

• Re-establishing new source review permitting requirements for stationary 

sources 

• Transportation control measures designed to reduce vehicle miles traveled 

• Other emission control measures appropriate for the area based on the 

consideration of cost-effectiveness, PM10 emission reduction potential, economic and 

social considerations, or other factors that the state deems appropriate 

G. SUBSEQUENT MAINTENANCE PLAN REVISIONS 

This revised maintenance plan provides for continued maintenance of the PM10 

NAAQS for an additional ten years beyond the original ten-year period. Consequently, 

no further maintenance plan updates are anticipated. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 22 
Colorado Department of Public Health and Environment / Air Pollution Control Division 

Revised PM10 Maintenance Plan for the 

Steamboat Springs Attainment/Maintenance Area 

DRAFT Technical Support Document 

Emission Inventory 

DRAFT 

September 2011 

Colorado Department of Public Health and Environment 

Air Pollution Control Division 

4300 Cherry Creek Drive South 

Denver, Colorado 80246 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Draft Technical Support Document - Emission Inventory 

August 30, 2011 
Colorado Department of Public Health and Environment / Air Pollution Control Division 

Table of Contents 

1. EMISSION INVENTORY METHODOLOGY 1 

2. 2008 AND 2024 EMISSION INVENTORY SUMMARIES 4 

3. REFERENCES 5 

ii 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Draft Technical Support Document - Emission Inventory 

August 30, 2011 
Colorado Department of Public Health and Environment / Air Pollution Control Division 

1. Emission Inventory Methodology 

The Air Pollution Control Division (APCD) developed the 2008 and 2024 emission inventories in 

the "PM10 Maintenance Plan for Steamboat Springs" using U.S. Environmental Protection 

Agency (EPA) approved emissions modeling methods, including EPA's MOVES2010a model and 

local VMT data for on-road mobile source emissions, EPA's non-road model, local demographic 

information for area and off-road sources, and reported actual emissions for point sources. 

Estimates for future emissions are based on the above-mentioned tools and population estimates 

from the State Demographer. The inventory represents average daily winter emissions. The 

MOVES2010a and non-road model inputs represent these average daily winter conditions. 

Heating and wood burning emissions were apportioned from annual emission estimates by heating 

degree day data from the Western Regional Climate Center. Other source categories were 

apportioned from annual to daily by dividing by 365. 

Highway mobile source emissions are from the EPA model MOVES2010a, an emission factor 

model for predicting gram per mile emissions of Hydrocarbons (HC), Carbon Monoxide (CO), 

Nitrogen Oxides (NOx), Carbon Dioxide (CO2), Particulate Matter (PM), and toxics from cars, 

trucks, and motorcycles under various conditions. 

Non-road source emissions are from the EPA Non-Road Model. This model includes the impact of 

future controls on non-road engines, which is used in equipment such as lawn and garden 

equipment and construction equipment. 

Area source emissions (including heating, construction, commercial cooking, etc.) are from the 

2008 EPA National Emissions Inventory (NEI), grown to 2024 by population growth from data 

from the State. For more documentation for these categories, refer to the NEI documentation 

(EPA, 2010). Wood burning and road dust emissions were calculated using local data and EPA 

AP-42 emission factors. 

It should be noted that the previous emissions inventory was based on data from 1997. Emission 

factors and activity data have evolved since that time. The largest share of total emissions, both in 

1997 and 2008 and beyond, is dust from paved roads. These emissions are a function of VMT, silt 

loading and empirically derived constants. The VMT's are nearly the same, a silt loading of about 

10 grams per square meter was used in the 1997 inventory, while a silt loading of only 0.5 grams 

per square meter was used in this inventory. This results in an emission factor which is more than 

20 times higher for paved road dust in 1997 than in the current inventory. The lower silt loading 

number used in the current inventory is more in line with current practices of using less sand for 

snow events, and quicker cleanup after the events. 

The MOVES2010A and Non-Road Models and the NEI report emissions for Pitkin County as a 

whole. Emissions were apportioned to the Attainment Area using geographical information 

system (GIS) techniques, using population, VMT and land area. 

1 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Draft Technical Support Document - Emission Inventory 

August 30, 2011 
Colorado Department of Public Health and Environment / Air Pollution Control Division 

Under Air Quality Control Commission Regulation No. 3, the APCD requires any source that 

emits two tons per year or greater to submit an Air Pollutant Emission Notice (APEN) (APCD, 

2008). This means that sources that emit less than two tons per year are not necessarily accounted 

for in an emissions inventory. The point source emissions for Steamboat Springs were obtained 

from this tracking system. The emission estimates are made using a variety of methodologies. 

Data from source-specific emission tests, or continuous emission monitors are preferable, but not 

always available. The EPA has developed a variety of emission factors to estimate emissions as 

well. Emission factors are frequently the best or only method available for estimating emissions. 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Draft Technical Support Document - Emission Inventory 

August 30, 2011 
Steamboat Springs PM-10 Attainment Area 

Legend 

-1-ColoradoAlrports08nei 

• Point Sources 

CITY * PM10 Monitor 

4F--I- RAIL_UN ES 

Major Roads 

HIGHWAYS 

Local Roads 

City of Steamboat Springs 

NA ME 

Steamboat Springs Attainment Area 

0 1.25 2 5 5 Miles 

I I I I I I 

Colorado Department of Public Health and Environment / Air Pollution Control Division 

Revised PM1 0 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Draft Technical Support Document - Emission Inventory 

August 30, 2011 
Colorado Department of Public Health and Environment / Air Pollution Control Division 

2. 2008 and 2024 Emission Inventory Summaries 

This section presents the 2008 and 2024 emission inventories for the maintenance plan. 

Table 1. PM10 Emission Inventories Based on 2008 NEI and Projected by Population (except as noted) 

Steamboat Springs Attainment Area 2008 2024 

Category PM10 t/d PM10 Pounds/d PM10 t/d PM10 Pounds/d 

Commercial Cooking 0.008 16.6 0.012 24.4 

Construction 1.755 3,509.7 2.572 5,143.1 

Fuel Combustion 0.004 8.6 0.006 12.6 

Highway Vehicles* 0.070 140.5 0.105 209.6 

Non-Road** 0.045 89.6 0.024 47.5 

Railroad 0.002 3.6 0.003 5.3 

Road_Dust*** 0.332 663.4 0.447 893.6 

Structure Fires 0.000 0.7 0.001 1.0 

Woodburning  0.239 478.0 0.350 700.5 

Point Sources** *** 0.093 185.1 0.136 271.3 

TOTAL 2.548 5,095.9 3.654 7,308.8 

* Based on MOVES, CDOT VMT 

** Based on NonRoad Model 

*** Based on Latest AP-42, CDOT VMT 

  Based on AP-42, Projected by Population as of 4/25/2011 data from State Demographer 

** *** Based on APENS, Projected by Population as of 4/25/2011 data from State Demographer 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Draft Technical Support Document - Emission Inventory 

August 30, 2011 

4 
Colorado Department of Public Health and Environment / Air Pollution Control Division 

3. References 

APCD, 2008. Air Quality Control Commission Regulation Number 3. Stationary Source 

Permitting and Air Pollutant Emission Notice Requirements. 5 CCR 1001-5. 

<http://www.cdphe.state.co.us/regulations/airregs/1 001 03 stationarysourcepermitting.pdf > 

U.S. EPA, 2010. "2008 National Emissions Inventory Data & Documentation." 

<http://www.epa.govittn/chief/net/2008inventory.html > 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Draft Technical Support Document - Emission Inventory 

August 30, 2011 
Meeting Agenda where Public Hearing Occurred and 

Notice published in the Legal Ads of the Denver Post 

40 CFR Part 51 Appendix V 2.10 
STATE OF COLORADO 

John W. Hickenlooper, Governor 

Christopher E. Urbina, MD, MPH, Executive Director and Chief Medical Officer 

COLORADO AIR QUALITY CONTROL COMMISSION 

littp://www.cdphe.state.co.us 

4300 Cherry Creek Drive South 

OED-OLRA-A5 

Denver, Colorado 80246-1530 

Phone (303) 692-3100 

Fax (303) 691-7702 

TDD (303) 691-7700 

Colorado Department 

of Public Health 

and Environment 

Notice of Meeting and Agenda 

Air Quality Control Commission 

December 15, 2011 

Colorado Department of Public Health & Environment 

4300 Cherry Creek Drive South, Sabin Room 

Denver, Colorado 

9:00 a.m. 

Call to Order: Determination of a Quorum 

Approval of Minutes: Review/Approval of the October 20, 2011 meeting minutes of the 

Air Quality Control Commission. 

Public Comment: 

RAQC Review: 

The public is invited to comment on any air pollution issue not on 

the agenda. The Commission will not take action on issues 

discussed under this item today; however, items may be scheduled 

for further discussion or action. 

Ken Lloyd of the Regional Air Quality Council will brief the 

Commission on updates from the RAQC and items that may be 

scheduled for further discussion. 

CONSENT AGENDA 

The Commission will vote on Item Numbers 1 through 4 as part of a Consent Agenda. Adoption 

of a Consent Agenda allows the Commission to consolidate voting on agenda items that do not 

need to be discussed individually and for which presentation of additional information is not 

required. 
REQUEST FOR PUBLIC HEARING 

1. Pikes Peak Area Council of Governments (PPACG) 

The Pikes Peak Area Council of Governments requests February 2012 hearing (or consent 

agenda ruling) regarding Conformity of its 2035 Moving Forward Regional Transportation 

Plan and 2012-2017 Transportation Improvement Program. The PPACG has made an 

affirmative conformity determination for its Plan and TIP, and seeks AQCC concurrence 

with the findings. 

RULEMAKING HEARINGS 

2. Regulation Number 9: Smoke Management Distribution of Cost Update 

The Commission will consider revisions to Regulation Number 9 regarding a periodic 

update in each permittees recent emissions and permitting activity data. This data is used to 

determine the distribution of the cost of the smoke management program to each permittee. 

3. PM2.5 Interstate Transport SIP 

The Commission will consider a proposed revision to the Interstate Transport State 

Implementation Plan (SIP) for the 2006 PM2.5 standard. This revision is a supplement to 

previously-approved chapters of the Interstate Transport SIP that the Commission approved 

in January 2010 and December 2008, which focused on the 1997 ozone and PM2.5 

standards. 

4. Steamboat Springs PM10 Maintenance Plan 

The Commission will consider a proposed SIP revision to the PM10 Maintenance Plan for 

the Steamboat Springs Attainment/Maintenance Area. Approval of the associated 

documents by both the City of Steamboat Springs and Routt County is anticipated by 

December 2011. Additionally, a change to the "Air Quality Standards — Air Quality 

Standards, Designations and Emission Budgets" regulation is proposed to update the PM10 

emission budget for the Steamboat Springs area. 

TRADITIONAL AGENDA 

RULEMAKING HEARINGS 

5. Regulation Number 10 and Procedural Rules: Criteria for Conformity 

(20 minutes presentation, 20 minutes discussion) 

The Commission will consider streamlining the transportation conformity process by 

allowing the Colorado Air Pollution Control Division to provide concurrence with routine 

transportation conformity determinations without the need for a public hearing before the 

Colorado Air Quality Control Commission. This change to the conformity process is 

allowed for under federal law and will reduce the burden on the AQCC, the Division and 

transportation planning organizations, while ensuring that air quality requirements are met. 

The Commission will consider proposed revisions to the SIP, AQCC's Regulation Number 

10 and the Procedural Rules. 
BRIEFINGS, DISCUSSIONS AND REPORTS 

6. Rocky Mountain National Park 

(20 minutes presentation, 20 minutes discussion) 

The Air Pollution Control Division, National Park Service, and Environmental Protection 

Agency are working together on the RMNP Initiative, a collaborative effort to reduce 

nitrogen deposition in Rocky Mountain National Park. The agencies will brief the AQCC 

on the progress of the tasks outlined in the Nitrogen Deposition Reduction Plan endorsed by 

the Commission in 2007 and the Contingency Plan adopted in 2010. 

7. Monitoring Briefing 

(30 minutes presentation, 20 minutes discussion) 

The Division will brief the Commission on monitoring sites operated by the Division and 

others. The briefing will address EPA monitoring and siting requirements, why sites are 

located in certain places and not in others, what pollutants are monitored, and possibilities 

for additional monitoring. New monitoring requirements from EPA will also be addressed 

and the Division's current plans to meet those requirements. 

8. HB09-1199: Colorado Healthy Forests and Vibrant Communities Act 

(40 minutes presentation, 20 minutes discussion) 

As a follow-up to the Commission's request from the March 2011 briefing, the Division will 

provide the Commission a status update regarding implementation of the recommendations 

from the HB09-1199 study. Additionally, the US Forest Service will be presenting a status 

update to the Commission on collaborative efforts with the Colorado Air Pollution Control 

Division regarding changes to the Colorado Smoke Management Program since the March 

17, 2011 Commission hearing. Deputy Regional Forester Brian Ferebee will be the lead 

presenter and will be assisted by several agency technical specialists. 

9. Commissioner Informational Items 

Commissioners will discuss among themselves activities that they have participated in over 

the past month that they believe other Commissioners and/or members of the public may be 

interested in hearing about. 

10. Division Director's Report — Will Allison 

Monthly activities report 

11. Attorney General's Report — Andrea Gelfuso-Goetz 

Update of any recent court actions on air quality issues 

12. Administrator's Report — Mike Silverstein 

• Review February agenda items 

• Review of Action Items from today's Commission meeting 

Adjourn 

3 
The Denver Newspaper Agency 

PUBLISHER'S AFFIDAVIT 

City and County of Denver 

State of Colorado 

The undersigned Jean Birch 

being first duly sworn under oath, states 

and affirms as follows: 

1. He/she is the legal Advertising Reviewer 

of the Denver Newspaper Agency, publisher 

of The Denver Post and Your Hub. 

2. The Denver Post and Your Hub are 

newspapers of general circulation that 

have been published continuously and 

without interruption for at least 

fifty-two weeks in Denver County 

and meet the legal requisites for a legal 

newspaper under Colo. Rev. Stat. 24-70-103. 

3. The notice that is attached hereto 

is a true copy, published in The Denver Post 

on the following date(s): 

Signa re 

Subscribed and sworn to before me this 31 

day of _ October , 2011. 

Notary Public 

My commission expires September 14, 2013 

(SEAL) 

Notice of Public end Rulemaking Hearings and Public Comment Hearings 

PUBLISH 10/29/11 

TihnegiC4rialigi,Air Quality Control Commission will hold the following rulernakDATE' December 15,2011 

TIME 9:00 AM 

PLACE: Colorado Department of Public Health and Environment 

4300 Cherry Creek Drive South - Sabin Conference Room 

Denver, CO 80246 

Notice of Rulemaking Hearing before the Colorado Air Quality Control Commission regarding Regulation Number 9 

Smoke Management Distribution of Cost Update 

The Air Quality Control Commission wilt hold a rulemaking nearing to consider 

revisions to Regulation Number 9 regarding a periodic update in each Per - mittees recent emissions and permitting activity data. This data is used to 

determine the distribution of the cost of the smoke management program to 

each eermittee. 

Notice of Rulemaking Hearing before the Colorado Air Quality Control Commission regarding Regulatfon Number 10 and the Procedural Rules Regulation 

The Air Quality Control Commission will hold a rulemaking hearing to consider streamlining the transportation conformity process by allowing the Colorado 

Air Pollution Control Division to provide concurrence with routine transportation conformity determinations without She need for a public bearing before the Colorado Air Quality Control Commission. This change to the conformity process is allowed for under federal law and will reduce the burden on 

the AQCC, the Division and transportation planning organizationS, while ensuring that air Quality requirements are met. The Commission will consider 

Proposed revisions to the AQCC's Regulation Number 10 and she Procedural 

Rules, governing conformity determinations in Colota00. 

Notice of Rulemaking Hearing before the Colorado Air Quality Control Com- mission regarding Colorado State implementation Plan regarding the Interstate Transport Plan 

The Air Quality Control Commission will hold a rulemaking hearing to consider 

a proposed revision to the Interstate Transport State Implementation Plan (SIP) for the 2006 PM2.5 standard. This revision is a suoolernent to previously-approved chapters of the Interstate Transport SIP that the Commis- sion approved in January 2010 and December 2008, which focused on the 1997 ozone and PM2.5 standards. 

Notice of Rulemaking Hearing before the Colorado Air Quality Control Commission regarding Steamboat Springs PM10 Maintenance Plan and the Air 

Qualify Standards, Designation9 end Emission audgets Regulation 

The Air Quality Control Commission will hold,' rulemaking hearing to consider 

a proposed revised PPM° Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area. Approval of the associated documents by both 

the City of Steamboat Springs and ROdIt County is anticipated by December 

2011. Additionally, a change to the" Air Quality Standards - Air Quality Stan- dards, Designations and Emission Budgets" regulation is proposed to up- date the P M10 emission budget for the Steamboat Springs area. 
Procedural Documents of the Commission 

- Agenda Item Control Sheet 

- Memorandum of Notice 

- Economic Impact Analysis (initial and final) 
COLORADO AIR QUALITY CONTROL COMMISSION 

AGENDA ITEM CONTROL SHEET 

Item Title Proposed Revision to the PM10 Maintenance Plan for the 

Steamboat Springs Attainment/Maintenance Area 

Meeting date December 15, 2011 

TYPES OF ACTION 

NON-HEARING ACTIONS REQUEST FOR HEARING HEARING 

— Administrative X Public Rulemaking — Public Rulemaking 

Briefing Informational _ Informational 

_ Policy 

Area Designations 

RECOMMENDED ACTION 

— Adoption X Approval _ Denial 

MOTION 

X Required _ Attached _ Not applicable 

STATUTORY AUTHORITY 

General 25-7-105 Specific 25-7-106, -107, -109 -302 

EPA SUBMITTAL 

Is this issue considered a SIP revision? Yes X No 

Which SIP? Steamboat Springs PM10 Date of EPA submission deadline: November 24, 2012 

Agenda Item Control Sheet for the Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 1 
ISSUE STATEMENT: 

The Air Pollution Control Division is requesting that the Colorado Air Quality Control 

Commission approve a proposed Revised PM10 Maintenance Plan for the Steamboat 

Springs Attainment/Maintenance Area. Both the City of Steamboat Springs and Routt 

County concur with the findings within the plan. 

The documentation shows that the Steamboat Springs area will continue to attain the 

PM10 National Ambient Air Quality Standard (NAAQS) through 2024, and has not 

violated the PM10 NAAQS during the past 10 years. No additional control measures 

are required for the Steamboat Springs area to maintain the standard. 

A change to the "Air Quality Standards — Air Quality Standards, Designations and 

Emission Budgets" regulation is needed, however, to update the PM10 emission budget 

for the Steamboat Springs area. 

By accounting for anticipated growth, it is projected that the Steamboat Springs area 

will demonstrate maintenance of the PM10 NAAQS through the year 2024 with a 

concentration of approximately 142 micrograms per cubic meter (the NAAQS is 150 

ug/m 3 ). 

This revision will satisfy the federal requirement for showing attainment for the second 

ten-year period after redesignation to attainment/maintenance. No additional revisions 

of the Steamboat Springs maintenance plan are anticipated. If future changes in 

mobile source models or other unforeseen considerations raise potential issues with 

maintaining the PM10 standard, the State will address the need to revise the 

maintenance plan at that time. 

Agenda Item Control Sheet for the Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 2 
Program Manager 

Division Director 

Date 

&iry ci I 

Date 

ATTACHMENTS: 

1 Revision to Air Quality Standards 

2. Final Economic Impact Analysis 

3. Final Statement of Basis and Purpose 

4. Revised PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area 

Technical Support Document/Emission Inventory for the Revised PM10 

Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

SIGNATURES: 

Preparer Date 

- 

Agenda Item Control Sheet for the Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 3 
MEMORANDUM OF NOTICE 

Date: August 30, 2011 

To: Interested Parties 

Subject: Revision to the Colorado Air Quality Control Commission's "Air Quality 

Standards — Air Quality Standards, Designations and Emission Budgets" 

Regulation in Support of the Revised PM10 Maintenance Plan for the 

Steamboat Springs Attainment/Maintenance Area 

GENERAL DESCRIPTION 

The Air Pollution Control Division (Division) proposes this rulemaking package with the intent 

of revising the Colorado "Air Quality Standards — Air Quality Standards, Designations and 

Emission Budgets" regulation, specifically to revise the PMIO emission budget for the 

Steamboat Springs Attainment/Maintenance Area. 

Nothing in this rule change exceeds the minimum requirements of the federal act. 

RULEMAKING PACKAGE 

Attachments to this memorandum provide details on the proposal as follows: 

• Attachment A: The actual language of the proposed revision to the "Air Quality 

Standards" regulation; 

• Attachment B: A statement describing the initial economic impact analysis of the 

proposed revision to the "Air Quality Standards" regulation; 

• Attachment C: Draft Statement of Basis and Purpose 

• Attachment D: The Revised PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area; and 

• Attachment E: Draft Technical Support Document — Emission Inventory 

EXPLANATION OF THE PROPOSED RULES 

Adoption of the Revised PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area and the above-mentioned Air Quality Standards regulation 

revision would establish a revised PM10 emission budget for the Steamboat Springs area. The 

Division requests approval and adoption of the revised maintenance plan and the proposed 

regulation revision as part of the State Implementation Plan (SIP). 

MATERIALS TO BE INCORPORATED BY REFERENCE IN THE PROPOSED RULES 

There are no materials to be incorporated by reference in the proposed rule revision. 

Memorandum of Notice for Revised PM10 Maintenance Plan for the Steamboat Springs Attainment Maintenance Area 

August 30, 2011 Page 1 
PUBLIC MEETINGS 

You are invited to review these materials and present written or oral comments to the Division in 

accordance with the following: 

Date: (3rd week after publication of proposed rule in the Colorado Register) 

Time: 8:00 a.m. - 5:00 p.m. 

Place: 4300 Cherry Creek Drive South, Denver, CO 80246 

Deadline for Submittal of Written Comments: November 1, 2011 

Christopher Dann is lead Division staff for the Revised PM10 Maintenance Plan for the 

Steamboat Springs Attainment/Maintenance Area. Following the close of the public comment 

period, Mr. Dann will prepare a Division Response to Public Comments that summarizes all 

public comments received, that discusses options for addressing the concerns, and makes 

recommendations from the Division for each issue. The Air Quality Control Commission 

(AQCC) will receive a copy of the Division Response to Public Comment and all written 

comments submitted to the Division. 

The AQCC will hold a public hearing on December 15, 2011. Interested parties may request 

meetings with Division staff three (3) weeks prior to the AQCC public hearing regarding this 

matter. To schedule a meeting, please contact Christopher Dann, who will make arrangements 

for a meeting regarding this proposed rulemaking. 

If you wish to be kept advised of these proceedings and/or receive a copy of the Division 

Response to Public Comments, you may request that your name be placed on the mailing list for 

this rulemaking proposal by contacting Christopher Dann at the following address: 

Christopher Dann 

Air Pollution Control Division 

4300 Cherry Creek Drive South 

Denver, CO 80246-1530 

Phone: (303) 692-3281 

Fax: (303) 782-5493 

E-mail: christopher.dann@state.co.us 

BACKGROUND ON DEVELOPMENT OF THE PROPOSED RULES 

What are the problems? 

The Air Pollution Control Division is submitting a 2011 Revised PM10 Maintenance Plan for the 

Steamboat Springs Attainment/Maintenance Area as required by the U.S. EPA to assure 

attainment for a second 10-year period beyond the initial maintenance period. The initial 10- 

year maintenance period extended from the November 2004 date when EPA approved the initial 

redesignation request and the associated attainment/maintenance plan. The second 10-year 

period extends through 2024. 

As part of the 2011 revision, a new PM10 emission budget has been established for 

transportation conformity. 

Memorandum of Notice for Revised PM10 Maintenance Plan for the Steamboat Springs Attainment Maintenance Area 

August 30, 2011 Page 2 
How do the proposed rules help solve the problems? 

The proposed changes to the Air Quality Standards regulation assign an updated emission budget 

for transportation conformity using the latest emissions inventory data. This updated emission 

budget also is reflected in the Revised PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area. 

Nothing in these rule changes exceeds the minimum requirements of the federal act. 

RULES' EFFECTS ON PUBLIC, REGULATED COMMUNITY, AND OTHER AGENCIES 

The proposed emission budget reflects the latest estimate of emissions. The establishment of a 

budget will impact the planning of federally funded/approved highway plans and projects and 

could require the implementation of mitigation efforts in order to comply with the emissions 

budget cap. No direct costs to the public are anticipated by establishing the emission budget. 

RELATIONSHIP TO FEDERAL AND ADJACENT STATE REQUIREMENTS 

Federal Requirements: 

The revision to the emission budget conforms to federal regulation. 

Adjacent State Requirements: 

The revision to the Air Quality Standards regulation is in conformance with the same federal 

requirements affecting attainment/maintenance areas in adjacent states. 

IMPLEMENTATION OF THE RULES 

The revised emission budget will be implemented through conformity determinations made 

under the transportation conformity regulations. The SIP Specific Regulation contingency 

measures will cease upon AQCC adoption and EPA approval of this rule change. No additional 

contingency measures are necessary unless the area records a violation of the PM10 NAAQS in 

the future. 

TIME CONSTRAINTS 

The proposed rule changes are to be completed in 2011 in order for the state to submit a 

Steamboat Springs SIP revision to the EPA in a timely manner to show attainment for the second 

ten-year term. In accordance with CAA 176A(b), it is required that a maintenance plan revision 

be submitted to the EPA within eight years after the original redesignation (which was on 

November 24, 2004) to address maintenance of the standard for a second ten-year period beyond 

redesignation. The purpose of this maintenance plan revision is to provide for maintenance of 

the PM10 standard for at least the additional ten years (through 2024) following the first ten-year 

period. 

There are no known specific time constraints except that this regulatory revision is directly 

associated with, and is a companion to, the maintenance plan update. 

Memorandum of Notice for Revised PM10 Maintenance Plan for the Steamboat Springs Attainment Maintenance Area 

August 30, 2011 Page 3 
RANGE OF REGULATORY ALTERNATIVES AND THE NO ANALYSIS 

No competing or alternative control measures were rejected when compiling this proposed 

revision as no new controls are being proposed. 

By taking no action, there would not be a second ten-year maintenance plan for this area as 

required by federal law. 

JUSTIFICATION FOR DIFFERING FROM FEDERAL REQUIREMENTS 

The proposed rules meet all requirements applicable to the area as required by federal regulation 

and the Clean Air Act. The proposed rules do not differ from or exceed the federal requirements. 

Memorandum of Notice for Revised PM10 Maintenance Plan for the Steamboat Springs Attainment Maintenance Area 

August 30, 2011 Page 4 
INITIAL ECONOMIC IMPACT ANALYSIS 

Per C.R.S. 25-7-110.5 

Revision to the "Air Quality Standards" Regulation 

September 15, 2011 

The Revised PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area revises the PM10 emission budget in the Air Quality 

Standards regulation. The rule change should not result in an increase in costs to 

industry, the public or the Air Pollution Control Division. 

The updated emission budget does not impose direct costs on any party, but may affect 

the manner in which transportation funds are allocated and expended. The emission 

budget applies to transportation agencies such as the city of Steamboat Springs and 

the Colorado Department of Transportation, but does not impose any direct costs on 

these agencies. Rather than increasing costs, the emission budget may change the 

mix of projects eligible for transportation dollars. 

Initial Economic Impact Analysis for Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

August 30, 2011 Page 1 
FINAL ECONOMIC IMPACT ANALYSIS 

Per C.R.S. 25-7-110.5 

Revision to the "Air Quality Standards" Regulation 

December 15, 2011 

The Revised PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area revises the PM10 emission budget in the Air Quality 

Standards regulation. The rule change should not result in an increase in costs to 

industry, the public or the Air Pollution Control Division. 

The updated emission budget does not impose direct costs on any party, but may affect 

the manner in which transportation funds are allocated and expended. The emission 

budget applies to transportation agencies such as the city of Steamboat Springs and 

the Colorado Department of Transportation, but does not impose any direct costs on 

these agencies. Rather than increasing costs, the emission budget may change the 

mix of projects eligible for transportation dollars. 

Final Economic Impact Analysis for Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 1 
Parties Hearing Documents 
EPA Comments 

40 CFR Part 51 Appendix V 2. 1 (h) 

— None Submitted 
Public Comments 

40 CFR Part 51 Appendix V 2.1(h) 

— Letter from Routt County 

— Letter from City of Steamboat Springs 
Sincerely, 

ROUTE COUNTY BOARD OF COUNTY COMMISSIONERS 

Box 773598 • Steamboat Springs, Colorado 80477 • 970-879-0108 

Fax: 970-879-3992 

November 15, 2011 

Nancy J. Stahoviak 

District 1 

Doug Monger 

District 2 

Diane MItsch Bush 

District 3 

Tom Sullivan 

County Manager 

Barbara Roberts 

Commission Chair 

Colorado Air Quality Control Commission 

4300 Cherry Creek Drive South 

Denver, CO 80246 

RE: Revised PM 10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area 

Dear Ms. Roberts, 

Thank you for the opportunity to review the Revised PM10 

Maintenance Plan for the Steamboat Springs Attainment/Maintenance 

Area. The Routt County Commissioners have reviewed the document 

and unanimously concur with and endorse the findings of the "Plan". 

The Commissioners are pleased that the plan demonstrates 

compliance with the National Ambient Air Quality Standard 

(NAAQS) for PM10 through 2024. 

Routt County appreciates the valuable assistance that the Colorado 

Air Pollution Commission and Air Pollution Control Division have 

provided in this regard. 

Diane Mits' Bush, Chair 

Routt County Board of County Commissioners 

RECEIVED 

NOV 2 3 2011 

AIR QUALITY 

CONTROL COMMISSION 
Stdir'n clt fboat Springs=k--* 

December 15, 2011 

Barbara Roberts 

Commission Chair 

Colorado Air Quality Control Commission 

4300 Cherry Creek Drive South 

Denver, CO 80246 

RE: Revised PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area 

Dear Ms. Roberts, 

Thank you for the opportunity to review the revised PM10 Maintenance Plan for the 

Steamboat Springs Attainment/Maintenance Area. The City of Steamboat Springs has 

reviewed the document and endorses the findings of the "Plan". The City of Steamboat 

Springs appreciates the valuable assistance that the Colorado Air Pollution Commission 

and Air Pollution Control Division have provided in this regard. 

Sincerely, 

Philo S. Shelton III, P.E. 

Public Works Director 

137 10th Street, P.O. Box 775088, Steamboat Springs, Colorado 80477-5088 

(970) 879-2060 • Fax (970) 879-8851 • www.steamboatsprings.net 

Printed on 30% Post Consumer Fiber ® OSA 
Adopted Statement of Basis, 

Specific Statutory Authority and Purpose 
VIII.BB. Steamboat Springs 

Adopted: December 15, 2011 

Basis and Purpose 

The purpose of this amendment is to update the PM10 emission budget for the Steamboat Springs area 

in connection with the adoption of the Revised PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area. 

Specific Statutory Authority 

The Commission promulgates this regulatory change pursuant to its authority under Section 25-7- 

105(1)(a)(1), C.R.S. to adopt a comprehensive state implementation plan that meets the requirements of 

the federal Clean Air Act. 

Findings Pursuant to Section 25-7-110.8 

The mobile source emission budgets are based on EPA-approved methods for calculating PM10 

emissions as required by federal regulations. All methodologies and information made available by 

interested parties have been considered. The emission budgets reduce the potential for air pollution by 

capping emissions from mobile sources. In adopting this rule, the Commission chose the most costeffective alternative. 
Adopted Language by the Commission 

(in redline & footer noting adoption date and page numbers) 
PM10:2015 through 2021: 54 tons/day; 2022 

and beyond: 55 tons/day. 

Nitrogen Oxides:2015 through 2021: 70 

tons/day; 2022 and beyond: 56 tons/day 

Trading provisions: Trading of PM10 for NOx, or 

NOx for PM10 to adjust emission budgets for 

purposes of demonstrating transportation 

conformity shall be allowed using the emission 

trading formula as follows: 

For trades necessary to increase a primary 

PM10 budget, 15.0 tons/day of NOx will be 

taken from the NOx budget to increase the 

primary PM10 budget by 1.0 tons/day, a ration 

of 15 to 1. 

For trades necessary to increase a NOx budget, 

1.0 tons/day of primary PM10 will be taken from 

the primary PM10 budget to increase the NOx 

budget by 12.0 tons/day, a ratio of 1 to 12. 

Implementation of trading provisions: In the 

event the MPO cannot demonstrate consistency 

with the specific PM10 and NOx mobile source 

emission budgets, the trading provisions may be 

utilized only after the MPO has considered all 

reasonably available local control measures to 

meet the budgets. The MPO must demonstrate 

the need for trading through the usual 

consultation procedures for state implementation 

plan development delineated in Section IV (F) of 

AQCC Regulation Number 10, Criteria for 

Analysis of Conformity. 

If trading is utilized, the MPO shall include the 

following information in the transportation 

conformity determination: 

( 1 ) The budget for primary PM10 and NOx 

for each required year of the conformity 

Denver 

Attainment/Maintenance 

Area (Modeling 

Domain) 

DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT 

Air Quality Control Commission 

AIR QUALITY STANDARDS, DESIGNATIONS AND EMISSION BUDGETS 

5 CCR 1001-14 

V.A. Budgets 

V.A.1 The following Motor Vehicle Emission Budgets shall be utilized to assess the conformity of 

Transportation Plans, TIPs, and where appropriate, Projects, for the applicable periods and 

geographic areas indicated: 

Air Quality Standards, Designations and Emission Budgets Regulation 

Adopted: December 15, 2011 Page 1 
determination, before trading is employed; (2) 

The portion of the original budget to be used to 

supplement a wanting budget, for each required 

year for the conformity determination; (3) The 

increased budget that results from trading, along 

with relevant calculations, and (4) the resulting 

primary PM10 and NOx budgets for each 

required year of the conformity demonstration. 

The MPO shall then compare projected 

emissions to the adjusted PM10 and NOx motor 

vehicle emission budgets to demonstrate 

conformity. 

Denver Attainment Ozone Precursors (attainment/maintenance 

Maintenance Area area boundary) NOx 2002 and beyond 134 tpsd 

VOC 2002 and beyond 119 tpsd (tpsd = tons per 

summer day) Carbon Monoxide 

(attainment/maintenance area boundary) 2013 

through 2020: 1625 tons/day; 2021 and beyond: 

1600 tons/day. 

Denver Metro Regional Emissions Budgets 

Area/North Front Range NOx: 122.9 tons/day 8-Hour Ozone 

Nonattainment Area VOCs: 109.2 tons/day 

Southern Sub-Regional Emissions Budgets 

NOx: 102.4 tons/day 

VOCs: 89.7 tons/day 

Northern Sub-Regional Emissions Budgets 

NOx: 20.5 tons/day 

VOCs: 19.5 tons/day 

Aspen PM10 2023 and Beyond: 1,146 lbs./day 

Attainment/Maintenance 

Area 

Carlon City PM102020 and Beyond: 1,613 lbs./day 

Lamar (Modeling Area) PM102015 and Beyond: 7,534 lbs./day 

Pagosa Springs PM10 2021 and Beyond: 946 lbs./day 

(Modeling Area) 

Steamboat Springs 

(Modeling Area) 

PM102015 and-Beyandthrough 2023:21,773 

lbs./day 

PM10 2024 and Beyond: 1,103.2 lbs./day 

Telluride (Modeling PM10 2021 and Beyond: 1,008 lbs./day 

Air Quality Standards, Designations and Emission Budgets Regulation 

Adopted: December 15, 2011 Page 2 
Area) 

Longmont 

Attainment/Maintenance 

Area 

Carbon Monoxide 2010 through 2014: 43 

tons/day 2015-2019: 43 tons/day 2020 and 

Beyond: 43 tons/day 

Colorado Springs 

Attainment/Maintenance 

Area 

Carbon Monoxide 2010 and Beyond: 531 

tons/day 

Ft. Collins 

Attainment/Maintenance 

Area 

Carbon Monoxide 2005 through 2009: 99 

tons/day2010 through 2014: 98 tons/day2015 

and Beyond: 94 tons/day 

Greeley Area 

Attainment/Maintenance 

Area 

Carbon Monoxide 2005 through 2009: 63 

tons/day2010 through 2014: 62 tons/day2015 

and Beyond: 60 tons/day 

VIII. Statements of Basis, Specific Statutory Authority and Purpose 

VIII.BB. Steamboat Springs 

Adopted: December 15, 2011 

Basis and Purpose 

The purpose of this amendment is to update the PM10 emission budget for the Steamboat Springs area 

in connection with the adoption of the Revised PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area. 

Specific Statutory Authority 

The Commission promulgates this regulatory change pursuant to its authority under Section 25-7- 

105(1)(a)(I), C.R.S. to adopt a comprehensive state implementation plan that meets the requirements of 

the federal Clean Air Act. 

Findings Pursuant to Section 25-7-110.8 

The mobile source emission budgets are based on EPA-approved methods for calculating PM10 

emissions as required by federal regulations. All methodologies and information made available by 

interested parties have been considered. The emission budgets reduce the potential for air pollution by 

capping emissions from mobile sources. In adopting this rule, the Commission chose the most costeffective alternative. 

Air Quality Standards, Designations and Emission Budgets Regulation 

Adopted: December 15, 2011 Page 3 
State Implementation Plan Elements 

Adopted by the Commission 

(in redline & footer noting adoption date and page numbers) 
Revised PM10 Maintenance Plan for the 

Steamboat Springs Attainment/Maintenance Area 

Colorado Department 

of Public Health 

and Environment 

10-year Revision: 

December 15, 2011 

Original Redesignation Request and Maintenance Plan adopted by: 

• The U.S. Environmental Protection Agency, October 25, 2004 

(effective November 24, 2004) 

• Colorado Air Quality Control Commission, November 15, 2001 

Revision Prepared By: 

Air Pollution Control Division 

Colorado Department of Public Health and Environment 

4300 Cherry Creek Drive South 

Denver, Colorado 80246 

Adopted by the Air Quality Control Commission December 15, 2011 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 1 
[Blank Page] 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 2 
TABLE OF CONTENTS 

TABLE OF CONTENTS 3 

SECTION 1: INTRODUCTION 4 

A. BACKGROUND 5 

1. PM10 National Ambient Air Quality Standard (NAAQS) 5 

2. Health and Welfare Effects of PM10 5 

3. Steamboat Springs Nonattainment Area Classification History 6 

4. Steamboat Springs Attainment/Maintenance Area Boundary 6 

Figure 1: Map of the Steamboat Springs Attainment/Maintenance Area 7 

B. ORGANIZATIONS INVOLVED IN PREPARING/APPROVING PLAN 8 

SECTION 2: PM10 ATTAINMENT HISTORY 9 

A. MONITORING HISTORY 9 

Table 1: Steamboat Springs PM10 Monitoring Record 9 

B. DESIGN VALUE DETERMINATION 9 

SECTION 3: STATE IMPLEMENTATION PLAN APPROVAL 11 

A. 1995 SIP ELEMENT 11 

B. 1996 SIP ELEMENT 11 

C. PM10 MAINTENANCE PLAN 11 

SECTION 4: PERMANENT AND ENFORCEABLE IMPROVEMENT IN AIR QUALITY 12 

A. OVERVIEW 12 

B. CONTROL MEASURES 12 

1. Woodburning Emission Controls 13 

2. Street Sanding Controls 13 

3. Street Sweeping Requirements 13 

4. Control of Emissions from Stationary Sources 13 

5. Federal Motor Vehicle Emission Control Program 14 

SECTION 5: MAINTENANCE PLAN 15 

A. REQUIREMENTS 15 

B. EMISSION INVENTORIES 16 

1. 2008 Base Year Emission Inventory 16 

Table 2: 2008 PM10 Base Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 17 

2. 2016 Interim Year Emission Inventory 17 

Table 3: 2016 PM10 Interim Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 17 

3. 2024 Maintenance Year Emission Inventory 18 

Table 4: 2024 PM10 Maintenance Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 18 

C. MAINTENANCE DEMONSTRATION 19 

D. PM10 EMISSION BUDGET 20 

E. MONITORING NETWORK/VERIFICATION OF CONTINUED ATTAINMENT 20 

F. CONTINGENCY PLAN 20 

1. Tracking 20 

2. Trigger and Response 21 

3. Potential Contingency Measures 22 

G. SUBSEQUENT MAINTENANCE PLAN REVISIONS 22 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 3 
SECTION 1: INTRODUCTION 

This document is the second PM10 Maintenance Plan for the Steamboat Springs 

Attainment/Maintenance Area. The U.S. Environmental Protection Agency (EPA) first 

approved a PM10 redesignation request and maintenance plan for the Steamboat 

Springs area on October 25, 2004 (69 FR 62210), which became effective on 

November 24, 2004. The redesignation request and maintenance plan was adopted by 

the Colorado Air Quality Control Commission on November 15, 2001. 

This second maintenance plan was prepared to meet the provisions of section 175A(b) 

of the Clean Air Act and contains the same emission control strategies as the first 

maintenance plan that was adopted by the commission in 2001. The 2011 plan 

includes updated emission inventories and projections using the latest EPA-approved 

tools. This plan establishes a new PM10 motor vehicle emission budget (MVEB) of 

1,103 pounds per day in 2024. 

The City of Steamboat Springs, Routt County, and the state of Colorado request 

continuation of "attainment/maintenance" status for the Steamboat Springs PM10 

Attainment/Maintenance Area. The Steamboat Springs area originally was designated 

as nonattainment for the National Ambient Air Quality Standard (NAAQS) for particulate 

matter with an aerodynamic diameter of ten microns or less (PM10) in 1993 (effective 

January 20, 1994). The area presently is demonstrating attainment with the PM10 

NAAQS. The Maintenance Plan section of this document has been updated and will 

demonstrate that the area will be able to maintain compliance with the NAAQS through 

the year 2024. The benefits of maintaining attainment/maintenance status include: 

1. Areas that maintain attainment/maintenance status no longer carry the stigma 

associated with nonattainment of the NAAQS. 

2. Attainment areas will not become "serious" nonattainment areas even if a 

violation of the NAAQS occurs in the future. This means that specific control 

measures can be applied to address a violation without going through a rigorous 

federal process, where serious areas must implement mandatory control 

measures and be subject to numerous administrative activities. 

3. Prevention of Significant Deterioration (PSD) permitting requirements continue to 

replace New Source Review (NSR) permitting requirements for new and 

modified major stationary sources. These permitting requirements are important 

for large industrial facilities that currently are not located, nor likely to locate, in 

the Steamboat Springs area. 

This plan is designed to document and ensure continuing attainment and maintenance 

of the NAAQS for PM10 in the Steamboat Springs area. This document is intended to 

comply with requirements of the federal Clean Air Act (CAA), and with relevant 

procedures and policies of the U.S. Environmental Protection Agency (EPA). 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 4 
A. BACKGROUND 

1. PM10 National Ambient Air Quality Standard (NAAQS) 

In 1971, the EPA set NAAQS for several air pollutants, including total suspended 

particulates (TSP), defined as particles with an aerodynamic diameter of less than 40 

microns. In 1987, the EPA changed the TSP standards by setting NAAQS for PM10, 

defined as particles with an aerodynamic diameter of ten microns or less (PM10). The 

current PM10 NAAQS allow for a maximum 24-hour average concentration of 150 

ug/m3. The 24-hour PM10 NAAQS may not be exceeded more than once per year on 

average over any three-year period. 

There are both primary and secondary air quality standards. The primary standards are 

set to protect human health with a margin of safety to protect the more sensitive 

persons in the population like the very young, elderly and the ill. Secondary standards 

are set to protect property, materials, aesthetic values and general welfare. For PM10, 

the national primary and secondary standards are the same. The numerical levels of 

the standards are subject to change, based on new scientific evidence summarized in 

air quality criteria documents. In 2006, the EPA revoked the annual PM10 standard but 

retained the 24-hour average of 150 ug/m3 (71 FR 61144) for both the primary and 

secondary NAAQS. 

In general, demonstrating attainment requires collecting representative air monitoring 

data and using approved measuring instruments and procedures, with adequate quality 

assurance and quality control. Air quality measurements in the Steamboat Springs 

area satisfy this requirement, as shown in Section 2 (Table 1 — Steamboat Springs 

PM10 Monitoring Record). 

2. Health and Welfare Effects of PM10 

Particulate matter is the term given to tiny particles of solid or semi-solid material 

suspended in the atmosphere. PM10 refers to a subset of particulate matter 10 

micrometers in diameter and smaller. PM10 is inhalable. In the Steamboat Springs 

area, PM10 is created primarily from re-entrained road dust, carbon black (from 

automobile and diesel engines) and soot (from fireplaces and woodstoves). PM10 from 

these combustion sources contains a large percentage of elemental and organic 

carbon, which contributes to atmospheric haze and to health problems. 

Additional PM10 sources, to a lesser degree, include restaurant grills and aircraft. 

Epidemiological studies and laboratory studies of humans and animals indicate that 

particulate matter can be inhaled deeply into the respiratory system, resulting in 

aggravation of existing respiratory and heart diseases, damage to lung tissue, 

impairment of breathing and respiratory functions, alterations to the body's physical and 

immune system defenses, and even premature death. Many particles also are 

composed of compounds that are known or suspected human carcinogens. People 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 5 
most sensitive to particulate matter are the elderly, children, and those with chronic lung 

disease, cardiovascular disease, influenza, and asthma. 

The welfare effects of particulate air pollution are widespread. Chemical and 

photochemical reactions involving the particles may occur in the air, or once they have 

been deposited on environmental media or structures. Such soiling and acid deposition 

cause visibility degradation, climate changes, and damage to crops, natural vegetation, 

water bodies, and aquatic life. In addition, sculpture and architecture may be damaged 

or destroyed by particulate soiling and acid deposition. 

3. Steamboat Springs Nonattainment Area Classification History 

Because of observed problems with air particles, monitoring for PM10 began in 1985. 

Based upon numerous exceedances of the 24-hour PM10 NAAQS, the Steamboat 

Springs area was designated by the EPA as a "moderate" nonattainment area in 1993 

pursuant to section 107(d)(3)(B) of the Clean Air Act. 

4. Steamboat Springs Attainment/Maintenance Area Boundary 

The boundary for the Steamboat Springs PM10 Attainment/Maintenance Area is 

defined as follows: 

On the East: The Routt National Forest 

On the South: The southern border of sections 19, 20, 21, T4N, R84W of the 6th 

P.M. and the southern border of sections 23, 24, T4N, R85W of the 

6th P.M. 

Beginning at the southwestern corner of section 23, T4N, R85W of 

the 6th P.M., north along the western border of sections 23, 14, 11, 

T4N, R85W. Thence, along the ridge which bisects sections 35, 

36, 25, 24, 13, 14, 11, 12, 1, T5N, R85W, and sections 36, 25, 24, 

T6N, R85W. Thence, heading northwest along the ridge which 

bisects sections 23, 15, 10, 9, 4, T6N, R85W of 6 th P.M. Thence 

heading northeast along the ridge which bisects sections 33, 34, 

35, 36, 25 T7N, R85W and sections 30 and 19 of T7N, R84W. 

Thence, north along the N 1/2 of the western edge of section 19, to 

the NW corner of section 18, T7N, R84W. 

On the West: 

On the North: The northern boundary of sections 16, 17, 18 T7N, R84W of the 6 th 

P.M. 

A map illustrating the area boundary is shown in Figure 1. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 6 
Steamboat Springs PM-10 Attainment Area 

Legend 

4+ Steamboat Springs Airport 

•Point Sources 

CITY *PM10 Monitor 

RAIL_LIN ES 

Major Roads 

HIGHWAYS 

LocalRoads 

City of Steamboat Springs 

NAM E 

Steamboat Springs Attainment Area 

0 1 25 25 5 Miles 

Figure 1: Map of the Steamboat Springs Attainment/Maintenance Area 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 7 
B. ORGANIZATIONS INVOLVED IN PREPARING/APPROVING PLAN 

Preparation of this revised maintenance plan was a cooperative effort of the City of 

Steamboat Springs, Routt County, and the Air Pollution Control Division (APCD) of the 

Colorado Department of Public Health and Environment. The EPA, through its regional 

office in Denver, provided policy advice and technical assistance, and is responsible for 

final approval of this revised maintenance plan. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 8 
SECTION 2: PM10 ATTAINMENT HISTORY 

A. MONITORING HISTORY 

Monitoring for PM10 in Steamboat Springs began in 1985. Numerous exceedances of 

the 24-hour PM10 NAAQS were the basis for the Steamboat Springs area being 

designated as a "moderate" nonattainment area in 1993 (effective January 20, 1994). 

Table 1 lists the yearly maximum, yearly estimated exceedances and the 3-year 

average estimated exceedances for the Steamboat Springs monitoring site(s) for the 

10-year period from 2001 through 2010. The state of Colorado maintains a PM10 

monitor at 136 6thStreet in Steamboat Springs. 

Table 1: Steamboat Springs PM10 Monitoring Record 

Year 

Maximum 

Concentration 

(ug/m 3) 

Yearly 

Estimated 

Exceedances 

3-yr Average 

Estimated 

Exceedances 

2001 100 0 0 

2002 119 0 0 

2003 149 0 0 

2004 94 0 0 

2005 86 0 0 

2006 87 0 0 

2007 99 0 0 

2008 124 0 0 

2009 83 0 0 

2010 99 0 0 

B. DESIGN VALUE DETERMINATION 

The "design value" is the critical air quality value upon which the maintenance plan is 

based. The design value, and the conditions that occurred on the day which it was 

measured, are utilized to develop emission inventories and serve as a baseline for 

modeling ambient concentrations into the future. The selection of the design value 

used in this revised maintenance plan utilized the EPA's table look-up method from the 

EPA's "PM10 SIP Development Guideline" document. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 9 
Based on the number of samples collected during the 2008 - 2010 period (999), the 

third highest concentration is the design value, according to this guidance. The three 

highest concentrations measured during the period 2008 -2010 are as follows: 

** 124 ug/m3 — February 18, 2008 

** 111 ug/m3 — February 20, 2008 

** 99 ug/m3 — February 3, 2010 

Consequently, the design value used for this revised maintenance plan is 99 ug/m3. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 10 
SECTION 3: STATE IMPLEMENTATION PLAN APPROVAL 

The following presents a brief summary of the development and the approval of the 

Steamboat Springs PM10 Nonattainment State Implementation Plan (SIP) Element. 

A. 1995 SIP ELEMENT 

The first Steamboat Springs SIP Element was adopted by the Colorado Air Quality 

Control Commission (AQCC) in September 1995. The control measures included: 1) 

local restrictions on woodburning devices, 2) specifications for street sanding materials 

(no more than 1% fines allowed), and 3) street sweeping requirements on Lincoln 

Avenue (once after each sanding event). The plan also included monitoring data, 

emission inventories, and dispersion modeling which demonstrated attainment of the 

PM10 NAAQS by December 1999 and continuing through December 2002. The EPA 

did not approve this SIP Element at the request of the state due to revisions to control 

measures and modeling that occurred before EPA could take action on the plan. 

B. 1996 SIP ELEMENT 

A new Steamboat Springs PM10 SIP Element was adopted by the AQCC in October 

1996. The control measures were revised to include: 1) local restrictions on 

woodburning devices, 2) specifications for street sanding materials (no more than 2% 

fines allowed), 3) street sweeping requirements on Lincoln Avenue (four times after 

each sanding event), and 4) street sand reductions of 10% on state highways. The plan 

also included revised monitoring data, emission inventories, and dispersion modeling 

which demonstrated attainment of the PM10 NAAQS by December 1999 and 

continuing through December 2002. In addition, contingency measures (additional 

street sweeping if the area violated the NAAQS and an emergency episode plan 

(suspension of open burning, voluntary wood and coal burning curtailment, and 

voluntary driving reductions if a NAAQS exceedance was expected) were adopted. This 

SIP Element was approved by the EPA on December 31, 1997 (62 FR 68188). 

C. PM10 MAINTENANCE PLAN 

The Colorado Air Quality Control Commission approved the Steamboat Springs PM10 

Maintenance Plan on November 15, 2001. The EPA subsequently approved the plan 

on October 25, 2004, which became effective on November 24, 2004. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 11 
SECTION 4: PERMANENT AND ENFORCEABLE IMPROVEMENT IN 

AIR QUALITY 

The state of Colorado must demonstrate, based on Section 107(d)(3)(E) of the Clean 

Air Act, that the improvement in air quality leading to attainment and continued 

compliance with the NAAQS is based on permanent and enforceable measures, and 

that the reductions are not the result of temporary reductions in emissions or unusually 

favorable meteorology. 

A. OVERVIEW 

It is reasonable to attribute the continued attainment of the PM10 NAAQS in the 

Steamboat Springs Attainment/Maintenance Area to emission reductions that are 

permanent and enforceable. These emission reductions are the result of local, state, 

and federal actions, not economic factors or unusual meteorology. 

Economic conditions are not responsible for improved ambient levels in the Steamboat 

Springs Attainment/Maintenance Area. It is assumed that growth in population and tax 

revenue are indicators of increased activities that cause increased PM10 emissions and 

the potential for elevated PM10 concentrations. Information obtained for the City of 

Steamboat Springs shows that, during the period 2000 through 2007, general sales and 

use revenues increased by 71.21 percent, while Routt County population increased by 

16.85 percent over the same period. During this period, attainment of the PM10 

NAAQS was demonstrated with no exceedances recorded. 

Favorable meteorology also is an unlikely reason. Although winter and spring 

meteorological conditions are highly variable in mountain settings, there is no evidence 

to suggest that meteorological conditions experienced in the 2000s have not been 

"typical" (though it is difficult to make concrete conclusions based on short-term 

meteorological records). Because there has not been a violation of the PM10 NAAQS 

in Steamboat Springs since 1996, the Air Pollution Control Division concludes that the 

good air quality in the Steamboat Springs area is the result of the implementation of 

emission reduction measures, not meteorological fluctuations. 

B. CONTROL MEASURES 

The following control measures resulted in the area's attainment of the PM10 NAAQS, 

and these measures should ensure continued maintenance of the PM10 NAAQS 

through the year 2024, which is the duration of the maintenance period. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 12 
1. Woodburning Emission Controls 

The City of Steamboat Springs and Routt County have adopted local ordinances and 

resolutions that limit the number and types of woodburning devices in new construction 

in the Steamboat Springs area. Installation of new solid fuel burning devices is limited 

to one approved device for any building. These requirements were adopted locally in 

the late 1980s and early 1990s and included in state regulation in 1995 {Section VIII.E. 

of the "State Implementation Plan-Specific Regulations for NonattainmentAttainment/Maintenance Areas (Local Elements)}. The rule was approved by the U.S. 

EPA in 1997. The requirements will remain part of state regulation and the federal State 

Implementation Plan (SIP). 

2. Street Sanding Controls 

There is a requirement that any user that applies street sanding materials in the 

Steamboat Springs Attainment/Maintenance Area must use materials containing less 

than two percent fines, except on U.S. Highway 40 from the junction of U.S. Highway 

131 toward Rabbit Ears Pass. This requirement was adopted in 1996 and approved by 

the U.S. EPA in 1997, and is defined in detail in Section VIII.B. of the {State 

Implementation Plan-Specific Regulations for Nonattainment-Attainment/Maintenance 

Areas (Local Elements)}. The requirement will remain part of state regulation and the 

federal SIP. 

3. Street Sweeping Requirements 

There are street sweeping requirements for a defined section of Lincoln Avenue 

(Highway 40 in Steamboat Springs). Beginning with the effective date of the U.S. EPA's 

approval of the initial maintenance plan (November 24, 2004), street cleaning using 

vacuum sweepers or any other sweepers with equal efficiency must occur two times 

within the four-day period of the roadways becoming free and clear of snow and ice 

following each sanding deployment use. These requirements are defined in detail in 

Section VIII.D. of the {State Implementation Plan-Specific Regulations for 

Nonattainment-Attainment/Maintenance Areas (Local Elements)}. The requirements will 

remain part of state regulation and the federal SIP. 

4. Control of Emissions from Stationary Sources 

The state's comprehensive permit rules limit emissions from any new source that may, 

in the future, locate in the Steamboat Springs area. These rules include: 1) CAQCC 

Regulation No. 3, "Air Pollution Emission Notices, Construction Permits and Fees, 

Operating Permits, and Including the Prevention of Significant Deterioration," 2) the 

"Common Provisions" regulation, and 3) CAQCC Regulation No. 6, "standards for 

Performance for New Stationary Sources." 

The Common Provisions, and Parts A and B of CAQCC Regulation No. 3, already are 

included in the SIP. CAQCC Regulation No. 6 implements the federal standards of 

performance for new stationary sources. As was the case with the initial maintenance 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 13 
plan, this revised maintenance plan makes no changes to these regulations. This 

reference to CAQCC Regulation No. 6 shall not be construed to mean that this 

regulation is included in the SIP. 

Emissions of PM10 from new or modified major stationary sources are controlled under 

CAQCC Regulation No. 3's nonattainment area New Source Review (NSR) permitting 

requirements. The NSR provisions require all new and modified major stationary 

sources to apply emission control equipment that achieves the "lowest achievable 

emission rate" (LAER) and to obtain emission offsets from other stationary sources of 

PM10. The PSD requirements are a relaxation from the NSR requirements, as LAER 

becomes the less stringent "Best Available Control Technology" (BACT), and offsets 

are not required. The application of these provisions is possible, but not foreseen, in the 

Steamboat Springs area. 

It should be noted that significant additional controls at both the Tri-State Generation 

and Transmission Association's Craig Generating Station and the Xcel Energy Hayden 

Generating Station that are part of the Colorado Visibility and Regional Haze State 

Implementation Plan will be installed during the effective period of this revised plan. 

5. Federal Motor Vehicle Emission Control Program 

The Federal Motor Vehicle Emission Control Program has reduced PM10 emissions 

through a continuing process of requiring diesel engine manufacturers to produce new 

vehicles that meet tighter and tighter emission standards. As older, higher-emitting 

diesel vehicles are replaced with newer vehicles, PM10 emissions in the Steamboat 

Springs area will be reduced. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 14 
SECTION 5: MAINTENANCE PLAN 

A. REQUIREMENTS 

Section 107(d)(3)(E) of the Clean Air Act (CAA) provides that, for an area to be 

redesignated to an attainment classification, the U.S. EPA must fully approve a 

maintenance plan which meets the requirements of CAA Section 175A. The 

maintenance plan will constitute a SIP revision and must provide for maintenance of the 

relevant NAAQS in the area for at least ten years after redesignation. The EPA first 

approved a PM10 redesignation request and maintenance plan for the Steamboat 

Springs area on October 25, 2004 (69 FR 62210), which became effective on 

November 24, 2004. 

An additional requirement (Section 175A(b)) is the submittal of a SIP revision eight 

years after the original redesignation request/maintenance plan is approved that 

provides for maintenance of the NAAQS for an additional ten years following the first 

ten-year period. The state of Colorado has satisfied this commitment by submitting this 

revised maintenance plan as required by the CAA and EPA requirements. 

Section 175A further states that the plan shall contain such additional control measures 

as necessary to ensure maintenance. All current nonattainment area control measures 

shall remain in place, except for the most stringent NSR stationary source permitting 

requirements (see Section 4.B.4.). This maintenance plan revision shall contain a 

contingency plan to ensure the prompt correction of any unforeseen violation of the 

PM10 NAAQS. Failure to maintain the NAAQS and triggering of the contingency plan 

will not necessitate a revision of the SIP Element, unless required by the EPA 

Administrator, as stated in CAA Section 175A(d). 

The provisions that are addressed in this maintenance plan revision include emission 

inventories (for a base year, an interim year and a maintenance year), a maintenance 

demonstration, an emission budget, an approved monitoring network, verification of 

continued attainment, and a contingency plan. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 15 
B. EMISSION INVENTORIES 

The emission inventories below include the 2008 base year, the 2016 interim year and 

the 2024 maintenance year. These inventories reflect the base and projected 

conditions in the Steamboat Springs Attainment/Maintenance Area, and account for the 

emission control measures that were adopted as part of the original redesignation 

request and the previous 10-year maintenance plan. Unlike the previous Steamboat 

Springs plan where the emission inventories were based on a grid system of the 

attainment/maintenance area, the updated emission inventories for 2008, 2016 and 

2024 are based on a number of EPA-approved emission modeling methods that are 

detailed in the Technical Support Document. Consequently, there are significant 

differences between the emission inventories in the previous plan and this revised and 

updated PM10 maintenance plan. 

1. 2008 Base Year Emission Inventory 

The 2008 Base Year Emission Inventory for the Steamboat Springs 

Attainment/Maintenance Area is presented below. This updated emission inventory 

incorporates the most current estimates for the following 10 source categories: 

• Commercial Cooking 

• Construction 

• Fuel Combustion 

• Highway Vehicles 

• Non-Road 

• Paved/Unpaved Road Dust 

• Point Sources 

• Railroad 

• Structure Fires 

• Woodburning 

The mobile source inventory (paved/unpaved road dust and highway vehicles) has 

been updated to reflect the following: 

• Latest traffic (VMT) estimates from the Colorado Department of Transportation 

• Revised emission factors and methods for determining paved road emissions 

• Road paving of unpaved roads that has occurred in the area 

• Vehicle exhaust emissions based on most up-to-date fleet mix 

All emission estimates were prepared by using EPA-approved methods and assigned to 

the area comprising the Steamboat Springs Attainment/Maintenance Area. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 16 
Table 2 presents the 2008 PM10 Base Year emission estimates for each source 

category in tons per year and pounds per average day. 

Table 2: 2008 PM10 Base Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 

Source Category 2008 PM10 [tons/year] 2008 PM10 [lbs/day] 

Commercial Cooking 2.92 16.6 

Construction 640.58 3509.7 

Fuel Combustion 1.46 8.6 

Highway Vehicles 25.55 140.5 

Non-Road 16.43 89.6 

Point Sources 33.95 185.1 

Railroad 0.73 3.6 

Road Dust 121.18 663.4 

Structure Fires 0.00 0.7 

Woodburning 87.24 478.0 

Totals: 930.02 5095.9 

2. 2016 Interim Year Emission Inventory 

Table 3 presents the 2016 PM10 Interim Year emission estimates for each source 

category in tons per year and pounds per average day. 

Table 3: 2016 PM10 Interim Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 

Source Category 2016 PM10 [tons/year] 2016 PM10 [lbs/day] 

Commercial Cooking 3.65 20.5 

Construction 789.68 4326.4 

Fuel Combustion 1.83 10.6 

Highway Vehicles 31.94 175.1 

Non-Road 12.60 68.6 

Point Sources 41.80 228.2 

Railroad 0.92 4.5 

Road Dust 142.17 778.5 

Structure Fires 0.19 0.85 

Woodburning 107.50 589.3 

Totals: 1131.87 6202.4 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 17 
3. 2024 Maintenance Year Emission Inventory 

Table 4 presents the 2024 PM10 Maintenance Year emission estimates for each 

source category in tons per year and pounds per average day. 

Table 4: 2024 PM10 Maintenance Year Emission Inventory (Steamboat Springs Attainment/Maintenance Area) 

Source Category 2024 PM10 [tons/year] 2024 PM10 [lbs/day] 

Commercial Cooking 4.38 24.4 

Construction 938.78 5143.1 

Fuel Combustion 2.19 12.6 

Highway Vehicles 38.33 209.6 

Non-Road 8.76 47.5 

Point Sources 49.64 271.3 

Railroad 1.10 5.3 

Road Dust 163.16 893.6 

Structure Fires 0.37 1.0 

Woodburning 127.75 700.5 

Totals: 1333.71 7308.8 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 18 
C. MAINTENANCE DEMONSTRATION 

This maintenance plan revision provides for continued maintenance of the 24-hour 

PM10 NAAQS through the year 2024, the 20-year period after the original redesignation 

request and maintenance plan was approved by the U.S. EPA in 2004. Because there 

have never been any exceedances of the annual PM10 NAAQS in Steamboat Springs, 

an analysis for maintenance of the annual standard was not prepared for the original 

redesignation request and maintenance plan. The EPA subsequently revoked the 

annual standard in 2006. 

A design day concentration of 99 ug/m3 has been selected as a conservative value 

that represents the third-highest 24-hour maximum PM10 value recorded in Steamboat 

Springs during 2008-2010. This 99 ug/m3 concentration occurred on February 3, 2010. 

No reduction for background values has been taken into account for the design day 

value, making the 99 ug/m3 a conservative estimate of PM10 ambient air 

concentrations in Steamboat Springs. The design value likely overstates the actual 

amount of PM10. 

The emission inventory data presented in this document is used to determine the 

growth in PM10 emissions from the 2008 base year to the 2024 maintenance year. 

The emission inventory shows an increase in PM10 from 5,095.9 pounds per day in 

2008 to 7,308.8 pounds per day in 2024. 

This represents an increase of 43.4 percent in emissions: 

7308.8/5095.9 = 1.434, or 43.4 percent. 

The design day concentration of 99 ug/m3 of PM10 is then increased 43.4 percent to 

"roll forward" to the 2024 attainment year. 

This roll-forward modeling results in a 2024 concentration of approximately 142 ug/m3: 

99 ug/m3 x 1.434 = 142 ug/m3 

Since 142 ug/m3 is below the 150 ug/m3 standard, maintenance is demonstrated 

through 2024. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 19 
D. PM10 EMISSION BUDGET 

Federal "transportation conformity" regulations provide for the use of mobile source 

emission budgets in making conformity determinations in the area. The emission 

budget serves as a ceiling on mobile source emissions that federally funded or 

approved transportation projects must comply or conform. 

This maintenance plan revision establishes a new PM10 motor vehicle emission budget 

(MVEB) for the Steamboat Springs Attainment/Maintenance Area of 1,103 lbs/day for 

2024. This budget is the total of the 2024 mobile source PM10 emissions (see Section 

5.B.3. above), which includes PM10 emissions from highways and paved/unpaved road 

dust. 

This budget has been adopted in the AQCC's "Air Quality Standards - Air Quality 

Standards, Designations and Emissions Budgets" regulation. 

E. MONITORING NETWORK/VERIFICATION OF CONTINUED 

ATTAINMENT 

The Air Pollution Control Division has monitored ambient PM10 concentrations in the 

Steamboat Springs area since 1985. The division has operated, and will continue to 

operate, the Steamboat Springs PM10 monitoring network in full accordance with the 

federal provisions of 40 CFR Part 58 and the EPA-approved Colorado Monitoring SIP 

Element. The division also will analyze the monitoring data to verify continued 

attainment of the PM10 NAAQS. This information will provide the necessary 

information to determine whether the Steamboat Springs area continues to attain the 

PM10 NAAQS. Detailed information regarding the state's monitoring efforts and 

historical monitoring data can be found in Section 2 of this document. 

F. CONTINGENCY PLAN 

Section 175(A)(d) of the Clean Air Act requires that the maintenance plan contain 

contingency provisions to assure that the state will promptly correct any violation of the 

PM10 NAAQS that may occur after the redesignation of the area to attainment. The 

EPA's redesignation guidance notes that the state is not required to have fully adopted 

contingency measures that will take effect without further action by the state. However, 

the contingency plan should ensure that contingency measures are adopted 

expediently once the need is triggered. The primary elements of the contingency plan 

involve the tracking and triggering mechanisms to determine when contingency 

measures would be needed, and a process for implementing appropriate control 

measures. 

1. Tracking 

The tracking plan for the Steamboat Springs area will consist of monitoring and 

analyzing PM10 concentrations. In accordance with 40 CFR Part 58, Colorado will 

continue to operate and maintain the Steamboat Springs PM10 monitoring network. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 20 
2. Trigger and Response 

Triggering of the contingency plan does not automatically require a revision of the SIP 

nor is the area necessarily redesignated once again to nonattainment. Instead, the 

state normally will have an appropriate timeframe to correct the violation with 

implementation of one or more adopted contingency measures. In the event that 

violations continue to occur, additional contingency measures will be adopted until the 

violations are corrected. 

Upon notification of a PM10 NAAQS exceedance, the Air Pollution Control Division and 

local government staff in the Steamboat Springs area will develop appropriate 

contingency measure(s) intended to prevent or correct a violation of the PM10 

standard. Information about historical exceedances of the standard, the meteorological 

conditions related to the recent exceedance(s), and the most recent estimates of 

growth and emissions will be reviewed. The possibility that an exceptional event 

occurred also will be evaluated (notification to the EPA and to the local governments in 

the Steamboat Springs area of any exceedance generally will occur within 30 days, but 

no later than 45 days). This process will be completed within six months of the 

exceedance notification. 

If a violation of the PM10 NAAQS has occurred, a public hearing process at the state 

and local level will begin. If the AQCC agrees that the implementation of local 

measures will prevent further exceedances or violations, the AQCC may endorse or 

approve of the local measures without adopting state requirements. If, however, the 

AQCC finds locally-adopted contingency measures to be inadequate, the AQCC will 

adopt state-enforceable measures as deemed necessary to prevent additional 

exceedances or violations. Contingency measures will be adopted and fully 

implemented within one year of a PM10 NAAQS violation. Any state-enforceable 

measures will become part of another revised maintenance plan, submitted to the 

Colorado Legislature and the EPA for approval. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 21 
3. Potential Contingency Measures 

The APCD and local government staff may choose one or more of the following 

contingency measures to recommend to local officials and the AQCC for consideration. 

Contingency measures will be selected that quickly bring the area back into compliance 

with the PM10 NAAQS and that specifically meet the needs of the Steamboat Springs 

area. It is likely that no federal or state monies will be available to fund the 

implementation of the selected contingency measure(s). Most, if not all, of the costs 

will be borne by local citizens and governments, local businesses, and state 

government agencies. 

• Increased street sweeping requirements 

• Road paving requirements 

• More stringent street sand specifications 

• Voluntary or mandatory woodburning curtailment 

• Bans on all woodburning 

• Expanded, mandatory use of alternative de-icers 

• Re-establishing new source review permitting requirements for stationary 

sources 

• Transportation control measures designed to reduce vehicle miles traveled 

• Other emission control measures appropriate for the area based on the 

consideration of cost-effectiveness, PM10 emission reduction potential, economic and 

social considerations, or other factors that the state deems appropriate 

G. SUBSEQUENT MAINTENANCE PLAN REVISIONS 

This revised maintenance plan provides for continued maintenance of the PM10 

NAAQS for an additional ten years beyond the original ten-year period. Consequently, 

no further maintenance plan updates are anticipated. 

PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

December 1, 2011 Page 22 
Colorado Department of Public Health and Environment / Air Pollution Control Division 

Revised PM10 Maintenance Plan for the 

Steamboat Springs Attainment/Maintenance Area 

Technical Support Document 

Emission Inventory 

December 15, 2011 

Colorado Department of Public Health and Environment 

Air Pollution Control Division 

4300 Cherry Creek Drive South 

Denver, Colorado 80246 

Adopted by the Air Quality Control Commission December 15, 2011 

Revised PM1 0 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Technical Support Document - Emission Inventory 

December 1, 2011 
Colorado Department of Public Health and Environment / Air Pollution Control Division 

Table of Contents 

1. EMISSION INVENTORY METHODOLOGY 

2. 2008 AND 2024 EMISSION INVENTORY SUMMARIES 3 

3. REFERENCES 4 

ii 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Technical Support Document - Emission Inventory 

December 1, 2011 
Colorado Department of Public Health and Environment / Air Pollution Control Division 

1. Emission Inventory Methodology 

The Air Pollution Control Division (APCD) developed the 2008 and 2024 emission inventories in 

the "PM10 Maintenance Plan for Steamboat Springs" using U.S. Environmental Protection 

Agency (EPA) approved emissions modeling methods, including EPA's MOVES2010a model and 

local VMT data for on-road mobile source emissions, EPA's non-road model, local demographic 

information for area and off-road sources, and reported actual emissions for point sources. 

Estimates for future emissions are based on the above-mentioned tools and population estimates 

from the State Demographer. The inventory represents average daily winter emissions. The 

MOVES2010a and non-road model inputs represent these average daily winter conditions. 

Heating and wood burning emissions were apportioned from annual emission estimates by heating 

degree day data from the Western Regional Climate Center. Other source categories were 

apportioned from annual to daily by dividing by 365. 

Highway mobile source emissions are from the EPA model MOVES2010a, an emission factor 

model for predicting gram per mile emissions of Hydrocarbons (HC), Carbon Monoxide (CO), 

Nitrogen Oxides (NOx), Carbon Dioxide (CO2), Particulate Matter (PM), and toxics from cars, 

trucks, and motorcycles under various conditions. 

Non-road source emissions are from the EPA Non-Road Model. This model includes the impact of 

future controls on non-road engines, which is used in equipment such as lawn and garden 

equipment and construction equipment. 

Area source emissions (including heating, construction, commercial cooking, etc.) are from the 

2008 EPA National Emissions Inventory (NEI), grown to 2024 by population growth from data 

from the State. For more documentation for these categories, refer to the NEI documentation 

(EPA, 2010). Wood burning and road dust emissions were calculated using local data and EPA 

AP-42 emission factors. 

The MOVES2010A and Non-Road Models and the NEI report emissions for Routt County as a 

whole. Emissions were apportioned to the Attainment Area using geographical information 

system (GIS) techniques, using population, VMT and land area. 

Under Air Quality Control Commission Regulation No. 3, the APCD requires any source that 

emits two tons per year or greater to submit an Air Pollutant Emission Notice (APEN) (APCD, 

2008). This means that sources that emit less than two tons per year are not necessarily accounted 

for in an emissions inventory. The point source emissions for Steamboat Springs were obtained 

from this tracking system. The emission estimates are made using a variety of methodologies. 

Data from source-specific emission tests, or continuous emission monitors are preferable, but not 

always available. The EPA has developed a variety of emission factors to estimate emissions as 

well. Emission factors are frequently the best or only method available for estimating emissions. 

1 

Revised PMIO Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Technical Support Document - Emission Inventory 

December 1, 2011 
Steamboat Springs PM-10 Attainment Area 

Legend 

Steamboat Springs Airport 

•Point Sources 

CITY 

PM10 Monitor 

41---1- RAIL_LIN ES 

Major Roads 

HIGHWAYS 

 LocalRoads 

 City of Steamboat Springs 

NAM E 

Steamboat Springs Attainment Area 

0 126 25 5 Miles 

Colorado Department of Public Health and Environment / Air Pollution Control Division 

Revised PMIO Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Technical Support Document - Emission Inventory 

December 1, 2011 
Colorado Department of Public Health and Environment / Air Pollution Control Division 

2. 2008 and 2024 Emission Inventory Summaries 

This section presents the 2008 and 2024 emission inventories for the maintenance plan. 

Table 1. PM10 Emission Inventories Based on 2008 NEI and Projected by Population (except as noted) 

Steamboat Springs Attainment Area 2008 2024 

Category PM10 t/d PM10 Pounds/d PM10 t/d PM10 Pounds/d 

Commercial Cooking 0.008 16.6 0.012 24.4 

Construction 1.755 3,509.7 2.572 5,143.1 

Fuel Combustion 0.004 8.6 0.006 12.6 

Highway Vehicles* 0.070 140.5 0.105 209.6 

Non-Road** 0.045 89.6 0.024 47.5 

Railroad 0.002 3.6 0.003 5.3 

Road Dust*** 0.332 663.4 0.447 893.6 

Structure Fires 0.000 0.7 0.001 1.0 

Woodburning  0.239 478.0 0.350 700.5 

Point Sources** *** 0.093 185.1 0.136 271.3 

TOTAL 2.548 5,095.9 3.654 7,308.8 

* Based on MOVES, CDOT VMT 

** Based on NonRoad Model 

*** Based on Latest AP-42, CDOT VMT 

  Based on AP-42, Projected by Population as of 4/25/2011 data from State Demographer 

** *** Based on APENS, Projected by Population as of 4/25/2011 data from State Demographer 

Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Technical Support Document - Emission Inventory 

December 1, 2011 

3 
Colorado Department of Public Health and Environment / Air Pollution Control Division 

3. References 

APCD, 2008. Air Quality Control Commission Regulation Number 3. Stationary Source 

Permitting and Air Pollutant Emission Notice Requirements. 5 CCR 1001-5. 

<http : //www. cdphe .state .co.us/regulations/airreg s/100 103 st ationarysourcepermitting.pdf > 

U.S. EPA, 2010. "2008 National Emissions Inventory Data & Documentation." 

<http://www.epa.govittn/chief/net/2008inventory.html > 

Revised PMIO Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area 

Technical Support Document - Emission Inventory 

December 1, 2011 
Colorado Air Quality Control Commission 

Meeting Minutes 

40 CFR Part 51 Appendix V 2.1(g) 
Phone (303) 692-3100 

Fax (303) 691-7702 

TDD (303) 691-7700 

Colorado Department 

of Public Health 

and Environment 

STATE OF COLORADO 

John W. Hickenlooper, Governor 

Christopher E. Urbina, MD, MPH, Executive Director and Chief Medical Officer 

COLORADO AIR QUALITY CONTROL COMMISSION 

hup://www.cdphe.state.co.us 

4300 Cherry Creek Drive South 

OED-OLRA-A5 

Denver, Colorado 80246-1530 

Colorado Air Quality Control Commission 

December 15, 2011 

MEETING MINUTES 

Location: Colorado Department of Public Health & Environment 

4300 Cherry Creek Drive South, Sabin Room 

Denver, CO 80246 

Members Present: Ashley Campsie Teresa Coons John Loewy 

Barbara Roberts Jon Slutsky Jim Wilson 

Members Absent: Robert Arnott Saeed Barhaghi Dawn Meyers 

Commission Staff: Mike Silverstein Theresa Martin 

Division Staff: Will Allison Lisa Silva Lisa Clarke 

Pat McLaughlin Gordon Pierce 

Attorney General's Office: Andrea Gelfuso-Goetz 

CALL TO ORDER AND DETERMINATION OF A QUORUM 

Chair Roberts called the meeting to order at 9:05 AM and determined that a quorum of 

Commissioners was now present with six Commissioners. 

APPROVAL OF MEETING MINUTES FOR OCTOBER 20, 2011 

Chair Roberts asked the Commission if there were any modifications to the minutes. Roberts had 

one edit changing Traditional Agenda to Regular Agenda. 

Motion: To approve the October 20, 2011 Meeting Minutes 

Moved: Commissioner Campsie 

Second: Commissioner Coons 

Discussion: none 

Carried: 6-0 
PUBLIC COMMENT 

Chair Roberts asked if there were any members of the public who wished to make a comment on 

any air pollution issue not on the agenda. There were no public comments. 

CONSENT AGENDA 

REQUEST FOR PUBLIC HEARING 

• Pikes Peak Area Council of Governments (PPACG) Conformity Determination 

RULEMAKING HEARINGS 

• Regulation Number 9: Smoke Management Distribution of Costs as prepared by the 

Division 

• PM2.5 Interstate Transport State Implementation Plan as prepared by the Division 

• Steamboat Springs PM 10 Maintenance Plan as prepared by the Division 

Motion: 

Moved: 

Second: 

Discussion: 

Carried: 

To adopt the Consent Agenda items 

Commissioner Wilson 

Commissioner Slutsky 

none 

6-0 

REGULAR AGENDA 

RULEMAKING HEARING 

Regulation Number 10: Criteria for Conformity 

The Commission considered streamlining the transportation conformity process by allowing the 

Colorado Air Pollution Control Division to provide concurrence with routine transportation 

conformity determinations without the need for a public hearing before the Colorado Air Quality 

Control Commission. This change to the conformity process is allowed for under federal law 

and will reduce the burden on the Commission, the Division and transportation planning 

organizations while ensuring that air quality requirements are met. The Commission also 

considered proposed revisions to the SIP, AQCC's Regulation Number 10 and the Procedural 

Rules. The Commission discussed how public concerns would be addressed or brought forward 

to the Commission. Allison noted that this could be discussed during the Director's Report as 

occurrences happened. 

Motion: 

Moved: 

Second: 

Discussion: 

Carried: 

To adopt the revisions to Regulation Number 10 and the Commission's 

Procedural Rules regarding conformity, as presented by the Division with the 

amended Statement of Basis, Specific Statutory Authority and Purpose for 

Regulation Number 10, and to correct the typographical error identified by 

the Division. In addition, the Commission directs that the Lead Planning 

Agency definition in Regulation Number 10 be revised to eliminate 

confusing language and errors. 

Commissioner Slutsky 

Commissioner Wilson 

none 

6-0 

2 
BRIEFINGS, DISCUSSIONS AND REPORTS 

Rocky Mountain National Park (RMNP) 

The Division, National Park Service, and Environmental Protection Agency have been working 

together on the RMNP Initiative, a collaborative effort to reduce nitrogen deposition in Rocky 

Mountain National Park. Lisa Clarke of the Division introduced Susan Johnson-Policy Analyst 

of the Air Resources Division NPS, Carol McCoy-Chief of the Air Resources Division NPS, Jim 

Cheatham-Biologist for the RMNP, and John Mack-Chief of Natural Resources for the RMNP. 

Clarke and Mack briefed the Commission on the progress of the tasks outlined in the Nitrogen 

Deposition Reduction Plan endorsed by the Commission in 2007 and the Contingency Plan 

adopted in 2010, as well as recent activities of the MOU agencies. Clarke provided a handout to 

the Commission and noted that the attachments helped illustrate the activities of the RMNP 

Agriculture subcommittee. The Commission received public comment from Robert Collier 

representing the Environmental Defense Fund. 

HB09-1199: Colorado Healthy Forests and Vibrant Communities Act 

As a follow-up to the Commission's request from the March 2011 briefing, Pat McLaughlin of 

the Division provided the Commission a status update regarding implementation of the 

recommendations from the HB09-1199 study. McLaughlin described the Division's prescribed 

fire efforts, the innovations and program improvements implemented this past year, and the steps 

going forward. Deputy Regional Forester Brian Ferebee of the Rocky Mountain Region US 

Forest Service lead the USFS's presentation and was assisted by Glenn Casamassa- Forest 

Supervisor for the Arapaho-Roosevelt National Forest and the Pawnee National Grassland, Paul 

Langowski- regional Branch Chief for Fuels and Fire Ecology, Jeff Sorkin- Air Program 

Manager for this region and the Intermountain Region of the US Forest Service and Cheri Ford 

who serves as a liaison between the Forest Service and Colorado. Casamassa presented a status 

update to the Commission on collaborative efforts with the Division regarding changes to the 

Colorado Smoke Management Program since the March 17, 2011 Commission hearing. 

Casamassa noted that to be successful there was a need to move forward on a more objective and 

transparent permitting process that allows for an appropriate increase in prescribed fire and to 

develop an approach to smoke management that considers both protection of public health and 

the needs of Coloradans for reduced hazardous fuels in our forests. Ferebee noted that they 

would like to provide the Commission with semi-annual updates and some field tours if they're 

interested. 

The Commission conducted business during the lunch hour with a discussion about their 

strategic planning process with LEAN consultant Barbara Shecter and Roz Bedell Operations 

Director for CDPHE. 

REGIONAL AIR QUALITY COUNCIL (RAQC) REVIEW 

Ken Lloyd briefed the Commission regarding the strategy tables that were discussed and 

approved at the RAQC's November meeting. Lloyd noted that even though additional 

mandatory measures as part of a federally-enforceable SIP were not required at this time in the 

Denver/North Front Range nonattainment area, the region still faced a challenge to achieve the 

2008 standard by 2015 and additional short-term actions would be prudent to ensure attainment. 

3 
Lloyd noted that additional measures would likely be needed beyond the 2015-2020 timeframe 

in order to maintain attainment with the current standard and address a possible more stringent 

standard in the future and in light of the need to continue ozone reduction measures in the shortterm, the RAQC asked its various strategy subcommittees to reconvene, review the listed 

strategies already developed, and identify recommended short-term activities and actions. 

Monitoring Briefing 

The Division briefed the Commission on monitoring sites operated by the Division and others. 

The briefing addressed EPA monitoring and siting requirements, why sites are located in certain 

places and not in others, what pollutants are monitored, and possibilities for additional 

monitoring. New monitoring requirements from EPA were also addressed and the Division's 

current plans to meet those requirements. Jannette Whitcomb, Environmental Manager with the 

City of Aspen monitored the briefing via conference call. 

Commissioner Informational Items 

Coons discussed EPA Advisory Committee meeting issues: nutrient standards guidance process 

— Colorado is on the forefront; wildfire and prescribed burns in terms of exceptional events; 

mercury legislation and how it will impact Colorado; formal resolution and concerns about 

ozone setback — what does that do to credibility; interagency collaboration; formal 

resolution/approval agency-wide effort to incorporate environmental impacts; and water 

subcommittee getting briefing regarding fracking. Slutsky toured the JBS Five Rivers Cattle 

Feeding to see how their gasifier turns manure into energy. Basically, the system burns feedlot 

manure to produce heat that is in turn used to produce steam energy 

Division Director's Report — Will Allison 

• Received letter from EPA for nonattainment area and approval of exact boundaries 

proposed 

• EPA moving forward with proposal for oil and gas NSPS — green completions being the 

most important 

• OGCC released fracking rules and must disclose chemicals/chemical families 

• EPA is coming out with new guidance on how to handle SO2 

• Rocky Mountain Steel Mill permit finalized 

• WildEarth Guardians seeking EPA nonattainment designations for PM exceptional events 

• EPA to finalize its utility MACT 

Attorney General's Report — Andrea Gelfuso-Goetz 

• CMA CORA — courts have decided that emails are confidential 

• CMA vs. Urbina — brief scheduled for March 

• Climate Change case was won — no public trust in air 

Administrator's Report — Mike Silverstein 

• Review February and March agenda items 

• Review of Action Items from today's Commission meeting 

• Informed Commission that review of the Procedural Rules would begin in March 

• Update on the Commission website redevelopment would occur at the February meeting 

Adjourn at 3:35 PM 

4 
Legal Opinion of the Colorado State Attorney General 

40 CFR Part 51 Appendix V 2.1(c) and (e) 
JOHN W. SUTHERS 

Attorney General 

CYNTHIA H. COFFMAN 

Chief Deputy Attorney General 

DANIEL D. DOMENICO 

Solicitor General 

STATE OF COLORADO 

DEPARTMENT OF LAW 

OFFICE OF THE ATTORNEY 

GENERAL 

STATE SERVICES BUILDING 

1525 Sherman Street - 7th Floor 

Denver, Colorado 80203 

Phone (303) 866-4500 

Fax (303) 866-5691 

Tracking Number: 2011 -00670 

OPINION OF THE ATTORNEY GENERAL RENDERED IN 

CONNECTION WITH THE RULES ADOPTED BY THE 

Air Quality Control Commission 

ON 12/15/2011 

5 CCR 1001-14 

AIR QUALITY STANDARDS, DESIGNATIONS AND EMISSION BUDGETS 

The above-referenced rules were submitted to this office on 12/16/2011 as required by section 24-4-103, C.R.S. This office has 

reviewed them and finds no apparent constitutional or legal deficiency in their form or substance. 

December 22, 2011 14:47:07 MST 

JOHN W. SUTHERS 

Attorney General 

by DANIEL D. DOMENICO 

Solicitor General 
Regulation or Regulation Revisions as Published in the 

Colorado Code of Regulations 

(this is the version that is published by Lexis Nexis) 

40 CFR Part 51 Appendix V 2.1(b) 
DEPARTMENT OF PUBLIC 

HEALTH AND ENVIRONMENT 

AIR QUALITY CONTROL COMMISSION 

AIR QUALITY STANDARDS, DESIGNATIONS AND 

EMISSION BUDGETS 

5 CCR 1001-14 

EDITOR'S NOTES* 

Authority Cited: 

24-4-103; 25-7-108, -110, -110.5, -110.8, -201, -209, C.R.S. 

History and Amendments: 

Amended 09/11/77, 1 CR 1. Added 05/25/78, 1 CR 6. Amended 12/14/78, 2 CR 1. Amended 04/12/79, 2 CR 5. 

Redesignated 08/23/79, 2 CR 9. Adopted 12/20/79, effective 1/30/80, 3 CR 1. Amended 03/27/80, effective per 

approval by the General Assembly, 3 CR 5. Adopted 03/10/83, effective 4/30/83, 6 CR 4. Adopted 10/17/83, 

effective 11/30/83, 6 CR 11. Repealed 07/20/89, effective 08/30/89, 12 CR 8. Adopted 12/21/89, effective 

01/01/93, 13 CR 2. Adopted as emergency regulation 02/21/91, effective 02/21/91, 14 CR 4. Adopted as 

emergency regulation 05/16/91, effective 05/16/91, 14 CR 6. Adopted 06/20/91, effective 07/30/91, 14 CR 7. 

Adopted 06/16/92, effective 07/30/92; Visibility Standard adopted 08/20/91, effective 01/01/93, 15 CR 7. 

Visibility Standard effective date postponed on an emergency basis 12/17/92, postponement effective 12/17/92; 

Visibility Standard effective 01/01/95, 16 CR 1. Adopted 03/18/93, effective 01/01/95, 16 CR 4. Adopted 

06/24/93, effective 08/30/93, 16 CR 8. Adopted 09/22/94, effective 11/30/94, 17 CR 11. Adopted 02/16/95, 

effective 04/30/95, 18 CR 4. Adopted 06/15/95, effective 08/30/85, 18 CR 8. Adopted 03/21/96, EFFECTIVE 

05/30/96, 19 CR 5. Adopted 09/19/96, EFFECTIVE 11/30/96, 19 CR 11. Adopted 10/17/96, EFFECTIVE 

12/30/98, 19 CR 12. Adopted 12/18/98, EFFECTIVE 03/02/98, 21 CR 2. Adopted 01/15/98, EFFECTIVE 

03/30/98, 21 CR 3. Adopted 09/17/98, EFFECTIVE 11/30/98, 21 CR 11. Adopted 01/10/00, EFFECTIVE 

03/01/00, 23 CR 2. Adopted 02/17/00, EFFECTIVE 04/30/00, 23 CR 4. Adopted 03/16/00, EFFECTIVE 

05/30/00, 23 CR 5. Adopted 01/11/01, EFFECTIVE 03/02/01, 24 CR 2. Adopted 04/19/01, EFFECTIVE 

06/30/01, 24 CR 6. Adopted 11/15/01, EFFECTIVE 12/30/01, 24 CR 12. Adopted 07/18/02, EFFECTIVE 

09/30/02, 25 CR 9. Adopted 12/19/02, EFFECTIVE 03/02/03, 26 CR 2. Sections V through VII Adopted 

06/19/03, EFFECTIVE 08/31/03, 26 CR 8. Parts V through VII Adopted 12/18/03, EFFECTIVE 03/01/04, 27 

CR 2. Parts III.F, III.M, VIII.S adopted 03/12/04, EFFECTIVE 05/31/04, 27 CR 5. 

A.G. Opinions: 

I AG 241; 2 AG 15; 2 AG 113; 2 AG 225; 3 AG 19; 3 AG 122; 6 AG 110-111; 8 AG 328; 13 AG 53; 14 AG 

118; 14 AG 193; 14 AG 225; 15 AG 256; 16 AG 23; 16 AG 114; 16 AG 278; 17 AG 423; 18 AG 148; 18 AG 

286; 19 AG 130; 19 AG 338; 19 AG 389; 21 AG 48; 21 AG 86; 21 AG 353; 23 AG 44; 23 AG 99; 23 AG 116; 

24 AG 60-60A; 24 AG 168; 24 AG 364; 25 AG 314; 26 AG 73; 26 AG 332; 27 AG 81; 27 AG 174; 

Annotations: 

Rule 16(c)(3)(b) and 16(c)(3)(c) was not extended by Senate Bill 92-132 and therefore expired June 1, 1992. 

*This Title Page does not constitute an official part of any regulation. Information contained on the Title Page is provided by the Publisher 

from sources deemed reliable and is solely for informational and historical purposes. See cautionary note in Introductory Materials, How to 

Use the CCR. 

C 2012 State of Colorado 

All Rights Reserved. (800) 833-9844 
EDITOR'S NOTES (continued) 

History and Amendments: 

Parts III.E, III.M, VIII.T adopted 12/16/04, EFFECTIVE 03/02/05, 28 CR 2. Pp. 20-21, 59-60 adopted 

12/15/05, EFFECTIVE 03/02/06, 29 CR 2. Rule replaced in its entirety, adopted 11/20/08, EFFECTIVE 

12/30/08, 31 CR 12. Rule replaced in its entirety, adopted 12/12/08, EFFECTIVE 01/30/09, 32 CR 1. Rules 

V.A, VIII.X, VIII.Y, adopted 11/19/09, EFFECTIVE 12/30/09, 32 CR 12. Rule replaced in its entirety, adopted 

03/18/10, EFFECTIVE 05/15/10, 33 CR 9. Rule V.A.1 [TN 2010-00855] adopted 12/16/10, EFFECTIVE 

03/01/11, 34 CR 2. Rule V.A.1, VIII.BB[TN 2011-00670] adopted 12/15/11, EFFECTIVE 01/30/12, 35 AG 1. 

A.G. Opinions: 

28 AG 46;29 AG 80; 31 AG Dec 1001-14; 32 AG Jan 1001-14; 32 AG Dec 1001-14 — 1001-14a; 33 AG Apr 

1001-14; 34 AG Feb 1001-14; 35 AG Jan 1001-14 

Annotations: 

5 CCR 1001-14 Page 2 
© 2012 State of Colorado 35 CR 1 and 2, 01-12 Page 21 

All Rights Reserved 

V. Emission Budgets for Attainment/Maintenance Areas in the State of Colorado 

V.A. Budgets 

V.A.1. The following Motor Vehicle Emission Budgets shall be utilized to assess the conformity of 

Transportation Plans, TIPs, and where appropriate, Projects, for the applicable periods and 

geographic areas indicated: 

Denver Attainment/Maintenance PM10: 2015 through 2021: 54 tons/day; 2022 and beyond: 55 

Area (Modeling Domain) tons/day. 

Nitrogen Oxides: 2015 through 2021: 70 tons/day; 2022 and 

beyond: 56 tons/day 

Trading provisions: Trading of PM10 for NOx, or NOx for PM10 

to adjust emission budgets for purposes of demonstrating transportation conformity shall be allowed using the emission trading 

formula as follows: 

For trades necessary to increase a primary PM10 budget, 15.0 

tons/day of NOx will be taken from the NOx budget to increase 

the primary PM10 budget by 1.0 tons/day, a ration of 15 to 1. 

For trades necessary to increase a NOx budget, 1.0 tons/day of 

primary PM10 will be taken from the primary PM10 budget to 

increase the NOx budget by 12.0 tons/day, a ratio of 1 to 12. 

Implementation of trading provisions: In the event the MPO 

cannot demonstrate consistency with the specific PM10 and 

NOx mobile source emission budgets, the trading provisions 

may be utilized only after the MPO has considered all reasonably available local control measures to meet the budgets. The 

MPO must demonstrate the need for trading through the usual 

consultation procedures for state implementation plan development delineated in Section IV (F) of AQCC Regulation Number 

10, Criteria for Analysis of Conformity. 

If trading is utilized, the MPO shall include the following information in the transportation conformity determination: 

(1) The budget for primary PM 10 and NOx for each required year of the conformity determination, before trading is 

employed; (2) The portion of the original budget to be used to 

supplement a wanting budget, for each required year for the 

conformity determination; (3) The increased budget that results 

from trading, along with relevant calculations, and (4) the resulting primary PM10 and NOx budgets for each required year of 

the conformity demonstration. 

The MPO shall then compare projected emissions to the adjusted PM10 and NOx motor vehicle emission budgets to demonstrate conformity. 

CODE OF COLORADO REGULATIONS 5 CCR 1001-14 
Page 22 

Denver Attainment Maintenance Ozone Precursors (attainment/maintenance area boundary) 

Area NOx 2002 and beyond 134 tpsd VOC 2002 and beyond 119 

tpsd (tpsd = tons per summer day) Carbon Monoxide (attainment/maintenance area boundary) 2013 through 2020: 1625 

tons/day; 2021 and beyond: 1600 tons/day. 

Denver Metro Area/North Front Regional Emissions Budgets 

Range 8-Hour Ozone Nonattainment Area NOx: 122.9 tons/day 

VOCs: 109.2 tons/day 

Southern Sub-Regional Emissions Budgets 

NOx: 102.4 tons/day 

VOCs: 89.7 tons/day 

Northern Sub-Regional Emissions Budgets 

NOx: 20.5 tons/day 

VOCs: 19.5 tons/day 

Aspen Attainment/Maintenance PM10 2023 and Beyond: 1,146 lbs./day 

Area 

Carlon City PM10 2020 and Beyond: 1,613 lbs./day 

Lamar (Modeling Area) PM10 2015 and Beyond: 7,534 lbs./day 

Pagosa Springs (Modeling Area) PM10 2021 and Beyond: 946 lbs./day 

Steamboat Springs (Modeling 

Area) 

PM10 2015 through 2023: 21,773 lbs./day 

PM10 2024 and Beyond: 1,103.2 lbs./day 

Telluride (Modeling Area) PM10 2021 and Beyond: 1,008 lbs./day 

Longmont Attainment/Maintenance Area 

Carbon Monoxide 2010 through 2014: 43 tons/day 2015-2019: 

43 tons/day 2020 and Beyond: 43 tons/day 

Colorado Springs Attainment/Maintenance Area 

Carbon Monoxide 2010 and Beyond: 531 tons/day 

Ft. Collins Attainment/Maintenance Area 

Carbon Monoxide 2005 through 2009: 99 tons/day2010 through 

2014: 98 tons/day2015 and Beyond: 94 tons/day 

Greeley Area Attainment/Maintenance Area 

Carbon Monoxide 2005 through 2009: 63 tons/day2010 through 

2014: 62 tons/day2015 and Beyond: 60 tons/day 

5 CCR 1001-14 CODE OF COLORADO REGULATIONS 
© 2012 State of Colorado 35 CR 1 and 2, 01-12 Page 57 

All Rights Reserved 

In the absence of clearly defined geographic "Category" areas in rule, the Colorado "Category I, II and 

III" incremental standards that remain in the Ambient Air Quality Standards Regulation cannot be applied in practice. While this proposal removes the state-only SO2 incremental standards, this change 

does not undermine existing protection for Colorado Federal Class I and II areas, or for those additional Colorado national monuments and forest service primitive areas currently granted Class I protection in Regulation Number 3. 

For these reasons, these state-only SO2 PSD increments should be removed from regulation. 

Reorganize, Clarify and Make Typographical, Grammatical, and Formatting Corrections 

The remaining proposed revisions to reorganize and rename the regulation, identify existing standards as state-only, identify missing CO and PM10 attainment/maintenance effective dates in tables, 

revise the 1-Hour Ozone Attainment/Maintenance Map title to clarify association with the 1-hour standard only, and make typographical, grammatical and formatting corrections, as necessary, are purely 

administrative in nature, and not believed to have any economic impact. 

Findings pursuant to C.R.S. §§ 110.5(5)(a) and 110.8 

These revisions eliminate PSD SO2 increments that would be more stringent than federal increments 

if they had been fully implemented. Because there are no currently designated areas to which the 

more stringent standards would apply, these standards cannot be implemented. Therefore, these 

revisions do not exceed or differ from the federal act or rules. 

These revisions align the increments in question with federal increments. The federal increments are 

based on reasonably available, validated, reviewed and sound scientific methodologies. These revisions are not intended to reduce air pollution and do not result in a demonstrable reduction in air pollution. Public health and the environment are sufficiently protected by the national increments. 

These revisions benefit the government, regulated community and the public by eliminating confusion 

caused by differences between state and federal requirements. 

VIII.AA Aspen PM10 

Adopted: December 16, 2010 

The amendments to the "Ambient Air Quality Standards for the State of Colorado" Regulation 

adopted by the Commission establish mobile source emissions budgets for the Aspen area. 

Federal Requirements 

Nothing in this rule change exceeds the minimum requirements of the federal act. 

Statutory Authority 

The authority to establish emissions budgets and to establish criteria for transportation conformity 

determinations is included in the general authority to adopt a State Implementation Plan set out in 

Section 25-7-105(1), C.R.S. (2001). 

Findings pursuant to Section 25-7-110.8 

The mobile source emissions budgets are based on EPA's MOVES2010 emissions model and EPAapproved methods for calculating fugitive dust emissions as required by federal regulations. All methodologies and information made available by interested parties have been considered. The emissions budgets reduce the potential for air pollution by capping emissions from mobile sources. In 

adopting this rule, the Commission chose the most cost-effective alternative. 

CODE OF COLORADO REGULATIONS 5 CCR 1001-14 
Page 58 

VIII.BB.Steamboat Springs 

Adopted: December 15, 2011 

Basis and Purpose 

The purpose of this amendment is to update the PM10 emission budget for the Steamboat Springs 

area in connection with the adoption of the Revised PM10 Maintenance Plan for the Steamboat 

Springs Attainment/Maintenance Area. 

Specific Statutory Authority 

The Commission promulgates this regulatory change pursuant to its authority under Section 25-7- 

105(1)(a)(1), C.R.S. to adopt a comprehensive state implementation plan that meets the requirements 

of the federal Clean Air Act. 

Findings Pursuant to Section 25-7-110.8 

The mobile source emission budgets are based on EPA-approved methods for calculating PM10 

emissions as required by federal regulations. All methodologies and information made available by 

interested parties have been considered. The emission budgets reduce the potential for air pollution 

by capping emissions from mobile sources. In adopting this rule, the Commission chose the most 

cost-effective alternative. 

5 CCR 1001-14 CODE OF COLORADO REGULATIONS