Ozone Planning and SIP Development Status

Public Meeting – Aurora Central LibraryAugust 14, 2008

• Secondary air pollutant formed in the atmosphere through reaction of: Volatile Organic Compounds (VOC) Nitrogen Oxides (NOx)

• Prime conditions for ozone formation Intense sunlight, high temperatures, persistent high

pressure systems, light winds & little moisture

• Ozone can trigger attacks & symptoms in individuals with pre-existing health conditions, as well as healthy individuals. Asthma affects more than 89,000 children between the

ages of 1 and 14 in Colorado

Ground-Level Ozone Pollution

Ozone Formation

Understanding WhereOzone Comes From

• Anthropogenic sources (man-made) Approximately 500 tons per day VOCs Approximately 400 tons per day NOx

History

• EPA established more stringent 8-hour ozone standard in 1997

• Early Action Compact with EPA – 2002• Ozone Action Plan – 2004• Region violated 8-hour standard in

2007 based on 2005-2007 3-year average

• EPA designated the Denver/NFR region nonattainment in November 2007

• Region must submit a new ozone plan (SIP) to EPA by July 1, 2009

Planning Overview

• Strategy evaluation and development

First round of strategy analysis nearing completionRAQC has approved strategies to include in draft plan

• Photochemical air quality modelingPreliminary 2006/2010 base case modeling completeSensitivity and source apportionment modeling underwayProposed control package(s) modeling in August

• Stakeholder involvementOver 40 stakeholder and public meetings

• Proposed Ozone Action Plan and SIPDraft plan for board and public review by August 1Proposal to AQCC in SeptemberAQCC adoption in DecemberLegislative review during 2009 session

VOC Emission Inventory~450 tpd

NOx Emission Inventory~336 tpd

2010 NAA NOx

Non-Road Sources18%

Mobile Sources (Highway)

36%

Non O&G Area 7%

Non-O&G Points (APEN)

26%

Other O&G Area1%

Compressor Engines (APEN)

7%

Exempt engines2%

Drill rigs3%

8 t/d

12 t/d24 t/d

3 t/d

86 t/d

61 tpd

120 t/d

22 t/d

Proposed SIP Strategies

1) More stringent I/M cutpoints (Denver area)

2) 7.8 RVP gasoline in NFR (same as Denver area)

3) Increase condensate tank control requirements – 95% on all tanks >10 tpy

4) Pneumatic valve controller replacements5) Expand Reg. 7 (VOC point source control)

to entire NAA6) Remove exemptions for sources to file

APENs and obtain permits7) Require RACT for minor point sources in

entire NAA

Proposed State-Only Strategies

1) I/M program in North Front Range2) High-emitter pilot program (Denver

area)3) Tighten collector plate requirements4) Control requirements for smaller

O&G condensate tanks – 95% control for tanks > 2tpy

5) Statewide oil & gas regulations – internal combustion engines

Strategies For Further Review

1) Ozone Fuels Strategies• Lower RVP gasoline (7.0 RVP)• Federal Reformulated Gasoline• Eliminate ethanol waiver

2) Controls on larger NOx sources• Power plants• Boilers• Cement kilns

3) Statewide oil & gas controls for new condensate tanks and pneumatic valves

4) CA Paints/Solvents/Consumer Products rule

Emission Reductions

Reduction 2006-2010 VOC NOx Federal programs (motor

vehicles, nonroad engines, refueling vapor recovery, paints & solvents)

35 tpd 53 tpd

Local mobile source controls (I/M cutpoints, NFR RVP) 5 tpd 4 tpd

Oil & Gas Regulations (condensate tanks, pnematic valves, engines)

110 tpd

na

Total Reductions150 tpd

57 tpd

Emission Budgets

• Motor vehicle emissions budgets for VOC and NOx will be established based on 2010 attainment inventory

• Considering two subarea budgetsDenver Metro Area (including southern Weld

Co.)North Front Range

• Separate conformity determinations by DRCOG and NFRMPO based on their subarea budgets

Conformity Subareas

Next Steps

• Draft SIP available on ozoneaware.org• Public meetings

August 20 – RAQC Board meeting – 3:00 p.m.

• RAQC approval of proposed SIP – Sept. 8

• RAQC proposes SIP to Air Quality Control Commission – September 18

• AQCC public hearing and SIP adoption

New 8-Hour Ozone Standards

• Final standards announced by EPA Administrator on March 12

• EPA concluded 1997 standards were not adequate to protect public health and welfare

• Lowered primary and secondary standards to 0.075 ppm

• Maintained current form of standards

8-hour averaging period3-year average of annual 4th maximum 8-hour

values at each monitoring site

Implementation Schedule

• Nonattainment designationsState recommendations by March 2009

» Based on 2006-2008 ozone dataEPA makes final designations by March 2010

» Based on 2007-2009 ozone data

• Attainment SIPsDue by March 2013 (3 years after final designations)

• Attainment Dates2013-2030 depending on severity of problem and

classificationClassifications will be addressed by future EPA

rulemaking

1997 Ozone Standards

• For now, 1997 8-hour ozone standards and all the associated regulatory requirements remain in place

• States and nonattainment areas should continue their plans for implementing the 1997 standards

• EPA will address transition issues from the 1997 standards to the 2008 standards in a separate rulemaking

Days Above .075 ppm(Denver/North Front Range Area)

0

10

20

30

40

50

2000 2001 2002 2003 2004 2005 2006 2007 2008

Nu

mb

er

of

Da

ys

>75 ppb >84 ppb