NO 2 NAAQS Guidance Leland Villalvazol Supervising AQS San Joaquin Valley APCD RSL Atlanta, Ga June 7, 2011 1
NO 2 NAAQS Guidance And Tools Disclaimer The information presented herein does not represent or supersede any guidance provided d by EPA or any reviewing i agency. The San Joaquin Valley APCD provides this guidance to the regulated community: For the purposes of Non-PSD (Non-Attainment NSR) permit modeling; To comply with the California Environmental Quality Act (CEQA) and; Other programs that fall under the District s authority 2
NO 2 NAAQS Guidance Topics San Joaquin Valley APCD s NO 2 Guidance Document 3
SJVAPCD s NO 2 Guidance Document History Draft California Air Pollution Control Officers Association (CAPCOA) Guidance Document Lessons Learned 4
History District Guidance February 2010 Modeling Procedure To Address The New Federal 1 hour NO 2 Standard April 2010 3 Tiers 1) Maximum hour over the modeling period, 2) 8 th highest hour over the modeling period, and 3) 98 th percentile over the modeling period. NO 2 Post-Processor 98 th percentile (5yr average of the daily 1-hour maximum by receptor) Paired-Sum 5
History District Guidance EPA clarification memoranda's in June 2010 Assessment of Non-Regulatory Option in AERMOD which provided for: Tier 4) Paired-Sum Addressed Appendix W Section 3.2.2 (e) requirements for alternative model use (OLM / PVMRM)» i. The model has received a scientific peer review;» ii. The model can be demonstrated to be applicable to the problem on a theoretical basis;» iii. The data bases which are necessary to perform the analysis are available and adequate;» iv. Appropriate performance evaluations of the model have shown that the model is not biased toward underestimates; and» v. A protocol on methods and procedures to be followed has been established. 6
Draft CAPCOA Guidance Document Mid 2010 the California Air Pollution Control Officers Association (CAPCOA) authorized the Engineer Manager s group to establish a NO 2 Modeling subcommittee to develop guidance to address permit modeling. Representatives from Air Districts in California California Energy Commissions With input from California Air Resources Board and EPA Region IX 7
Draft CAPCOA Guidance Document The Draft CAPCOA Guidance has been updated to include several of the issues addressed in EPA s March 1, 2011 Memoranda NO 2 Background (Hr-Of-Day) Intermittent Operating units The document is structured t as a cookbook k providing options that may be used with approval from the reviewing agency. For Example: 8
Draft CAPCOA Guidance Document Table 1- NO 2 Tier Quick Reference Tier Option Information Needed 1. Model (ISCST3/AERMOD) 1 2. Significant Impact Level (SIL) I 2 11 3. Background Air Quality Data Total 6 11 4. Post processor* Conversion 5. Hourly NO 11 2 Background Data II ARM III OLM/PVMRM 6. Paired-Sum Post Processor** 1. Model (ISCST3/AERMOD) 1 2. Significant Impact Level (SIL) 3. ARM Ratio 2 11 4. Background Air Quality Data 6 11 5. Post processor* 11 6. Hourly NO 2 Background Data 7. Paired-Sum Post Processor** 1 1. Model (ISCST3/AERMOD with a post-processor) 2. Significant Impact Level (SIL) 3. Hourly Ozone Background data 4. In-Stack NO 2 /NO X Ratio 2 11 5. Background Air Quality Data 6 11 6. Post processor* 11 7. Hourly NO 2 Background Data 8. Paired-Sum Post Processor** 9
Draft CAPCOA Guidance Document 1. Significant Impact Level (SIL)* 2. Maximum Modeled + Maximum Monitor Value 3. Maximum Modeled + 98 th Monitor Value 4. 8 th Highest Modeled + Maximum Monitor Value 5. 8 th Highest Modeled + 98 th Monitor Value 6. 5 yr Ave of the 98 th percentile + Maximum Monitor Value* 7. 5 yr Ave of the 98 th percentile + 98 th Monitor Value* 8. 5yrAveofthe98 th percentile + Monthly Hour-Of-Day (1 st highest)* 9. 5 yr Ave of the 98 th percentile + Seasonal Hour-Of-Day (3 rd Highest)* 10. 5 yr Ave of the 98 th percentile + Annual Hour-Of-Day (8 th Highest)* 11. Paired-Sum (5 yr Ave of the 98 th percentile)** *EPA recommended option **May use with the approval of the reviewing agency. 10
Draft CAPCOA Guidance Document What does the guidance document cover? Background & Requirements NO 2 Chemistry Appendix W Tier 1 - Total Conversion Tier 2 - Ambient Ratio Method (ARM) Tier 3 - Ozone limiting Method (OLM) Tier 3 - Plume Volume Molar Ratio Method (PVMRM) Conducting NO 2 Modeling NO 2 Background Data Ozone and NO 2 Datasets Gap Filling For Ozone and NO 2 Datasets 11
Draft CAPCOA Guidance Document What does the guidance document cover? In-Stack NO2/NOX Ratio Demonstrating Compliance with the NAAQS Appendix A Modeling Procedure Appendix B - OLM/PVMRM Justification Appendix C - In-Stack NO2/NOx Ratios Appendix D Meteorological Resources 12
Lessons Learned Default Ozone Value of 40 ppb OZONEVAL EPA document entitled AERMOD: Model Formulation Document http://www.epa.gov/scram001/7thconf/aermod/aermod_mfd_addm_rev.pdf Was not intended as a standard default. Ozone Datasets Baseline 40 / 200 ppb = No Ozone files used. Default of 40 / 200 ppb used for every hour Simple 40 / 200 ppb = Ozone files used. Single missing hour filled only. Default of 40 / 200 ppb used Simple Max = Ozone files used. Single missing hour filled only. Maximum annual used as Default. Simple 2 Qtr = Ozone files used. Single missing hour filled only. All other missing hours filled using max for the quarter. MonthlyMaxHourly M M H l = Ozone files used. Single missing i hour filled only. All other missing i hours filled using max Hour-of-day for each month. MonthlyMax = Ozone files used. Single missing hour filled only. All other missing hours filled using max for the each month. 13
Lessons Learned 160 140 100 BHP Baseline 200ppb Baseline 40ppb Simple 200ppb Simple 40ppb Simple Max (135ppb) Simple 2 Qtr MonthlyMaxHourly y MonthlyMax ncentration n Co 120 100 80 60 40 20 0 25 100 250 400 550 700 850 1000 1750 3000 Distance (m) 100 BHP DICE 14
Lessons Learned 30 25 825 BHP Baseline 200ppb Simple 200ppb Simple Max (135ppb) MonthlyMaxHourly Baseline 40ppb Simple 40ppb Simple 2 Qtr MonthlyMax Co oncentration n 20 15 10 5 0 25 100 250 400 550 700 850 1000 1750 3000 Distance (m) 825 BHP DICE 15
Lessons Learned 16 14 Boiler Baseline 200ppb Simple 200ppb Simple Max (135ppb) MonthlyMaxHourly Baseline 40ppb Simple 40ppb Simple 2 Qtr MonthlyMax Co oncentration n 12 10 8 6 4 2 0 25 100 250 400 550 700 850 1000 1750 3000 Distance (m) Boiler 16
Lessons Learned 70 60 Turbine Baseline 40ppb Simple 40ppb Simple 200ppb MonthlyMaxHourly Baseline 200ppb Simple Max (135ppb) Simple 2 Qtr MonthlyMax Co oncentration n 50 40 30 20 10 0 25 100 250 400 550 700 850 1000 1750 3000 Turbine Distance (m) Please Note: OAQPS has since fix the error in AERMOD when using the OZONEVAL 17
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Contact Information Leland Villalvazo Supervising AQS San Joaquin Valley APCD 1990 E Gettysburg Ave Fresno, CA 93726 Phone: (559) 230-5581 Emails: leland.villalvazo@valleyair.org HRAModeler@valleyair.org Inventory@valleyair.org 19