1 

# Matagorda County emissions do not contribute to ozone formation in HGB2 

# Declining Emissions and Declining

Growth Do Not Support Nonattainment

• Population Data and Degree of Urbanization : Matagorda County is a Micropolitan Statistical Area . • Growth Rates and Patterns : Population in Matagorda County declined by 3 % from 2000 to 2010 . • Traffic and Commuting Patterns : The VMT in Matagorda County declined by 1 % from 2002-2008 .
• Emissions Data :

– Emission Corrections (2008 )

– Emission Corrections (Oil and Gas lb/BBL local data)

– Emission Reductions (2008 - 2010 ) 

### • Air Quality Analysis : Matagorda County emissions do not meaningfully contribute to HGB ozone

– TCEQ Apportionment Analysis

– Area Source VOC Reduction Analysis for Counties Outside of HGB3 

# Matagorda County Compared to 47 Counties Designated BY EPA

Nationwide

• Matagorda county ranked last with the least VMT of all 47 counties . • Matagorda County ranked 4th to the bottom in population at 36 , 702 . • Only 4 counties proposed by EPA, including Matagorda County, are not in a Metropolitan Statistical Area (“MSA”). (Matagorda County is a Micropolitan Statistical Area.)
• Matagorda does not have sufficient “social or economic ties" to be included in the 10 county Houston Metropolitan Statistical Area ("Houston Metro") . • EPA inappropriately uses the Consolidated Statistical Area to include Matagorda County.

– CSA does not require "social or economic ties", only a minimal 15% employment interchange with another county.

– The use of CSA is particularly arbitrary when basis for the CSA, VMT and population, for Matagorda County, has declined from 2008 - 2010 .4 

# Emission Corrections (2008)

• **Nonroad NOx** 

– 7 , 007 tpy in EPA's Technical Support Document (TSD)

– (2 , 928 ) tpy (TCEQ January 11 , 2012 Letter to EPA, p . 2 )

– 4 , 079 Revised total NOx


## • **Nonroad VOC** 

– 3 , 153 tpy in TSD

– (664 ) tpy (TCEQ 1 / 12/ 12 EI Discrepancy Table)

– 2 , 489 Revised Nonroad VOC 

## • **Oil and**  **Gas VOC**  **emissions (Area**  **Sources)**

– Oil and Gas Area Sources are 14 , 662 tpy, 84 % of total VOCS in Matagorda's 2008 Emissions Inventory (EI)

– VOC emissions from condensate tanks, 13 , 302 tpy, are overestimated (see next three slides)5



# Emission Corrections Oil and Gas Condensate Tank Emissions

**Source VOC**  **Lbs/BBL Basis**  **of Estimate 2008**  **TPY VOCs**  **2010 TPY** 

**VOCs Current**  **TCEQ/TERC Report 33.3**  **lbs/BBL Statew** **ide default**  **emission factor from TCEQ study**  **13,302.03 7,570**  **Local Option**  **1 TCEQ/TERC**  **–**

**weighted average**  **for production rates**  **(See T able 3**  **- 3)**  **16.75**

**lbs/BBL TCEQ statew** **ide**

**factor w eighted for**  **production (BBL/day** **) at w** **ell 6,716**  **3,808 Local**  **Option 2**  **TCEQ/TERC Study**

**minus Denton County**  **s ites w** **ith 200**  **PSI 12.1**  **1 lbs/BBL TCEQ statew** **ide factor minus Denton**  **County s**  **ites w ith**  **200 PSI**  **4,837 2,753**  **Local Option**  **3 TCEQ/TERC**  **–**

**modified for MC -** **like wells**  **(psig less than**  **50) (See T**

**able 3 -** **3 and 3**  **- 1)**  **6.972 lbs/BBL**  **TCEQ statew ide** 

**factor modified for discharge pressure**  **2,796 1,585** 
**Local Option**  **4 Matagorda County**  **2.5 lbs/BBL MC Condensate**  **sample taken from**  **separator before**  **discharge to tank 1,002**  **568** Regardless of the Local Option chosen, actual VOC emissions are much less than the currently used 33.3 lbs/BBL. Therefore, total oil & gas VOC emissions are much less than stated in the EP A T echnical Support Document.6



# Oil and Gas Analysis by PSI, lb/BBL and County

(Local Option 2)

**0 20**  **40 60**  **80 100**  **120 140**  **160 180**  **200**

**TE RC**  **(Den to**  **n On**  **ly )**  **TE RC**  **(Al l** 

**Site s)**  **TER C** 

**(Without Den** **ton) Ma** **tag or** **da**

**Co unty**  **(M C)**  **sp eci** **fic PSI** **A vg**  **lb/B BL** **A**

**vg**



# * **#** * Avg. PSI based upon preliminary estimates from operators of 35% of 2008 condensate BBL produced in MC. **#** Based upon site specific sampling and modeling of one of the largest 2010 condensate producing leases in MC. Texas Environmental Research Consortium (TERC) Report on VOC Emissions from Oil and Condensate Storage Ta nks found at http://files.harc.edu/Projects/AirQuality/Projects/H051C/H051CFinalReport.pdf7



# Oil and Gas Analysis by PSI, lb/BBL and County

**TERC (Denton Only** **) TERC** 

**(A ll Sites)**  **TERC**

**(Without Denton)**  **Matagorda County**  **Specific PSI**  **Av g**  200 11 9.1 45.7 45.4 ***** **VOC lb/BBL Av** **g** 56.58 33.3 12.1 1 2.5 **#**

***** Avg. PSI based upon preliminary estimates from operators of 35% 2008 condensate BBLproduced in Matagorda County

### . # Based upon site specific sampling and modeling of one of the largest 2010 condensate producing leases in Matagorda County.8



# Emission Reductions 2008 - 2010

• **NOx Reductions**  **to 2010** 

– ( 180 . 86 ) tpy NOx emission reductions 2008 to 2010 from point sources

– VMT Reduction by 1 %
• **VOC Reductions**  **to 2010** 

– TCEQ estimates 8 , 758 tpy VOCs from oil and gas operations
• (5 , 904 ) tpy VOC emission reductions from 2008 to 2010 from oil and gas area sources (TCEQ Emission Inventory) • Emissions in 2008 were a result of one-time oil & gas activity in the County . Not expected to return to that level of activity.



### – Local VOC lb/BBL data should be used (previous slides)

– VMT Reduction by 1 %9 

# VOC Emissions Are not Primary Driver of Ozone Formation in HGB EPA has approved the current SIP strategy based primarily on NOx reductions with targeted HRVOC controls: These [Texas SIP] revisions result from more recent information on ozone formation in the Houston/Galveston area indicating that a combination of controls on oxides of Nitrogen (NOx) and highly reactive volatile organic compounds (HRVOCs) should be more effective in reducing ozone than the measures in the previously approved plan wh ich relied almost exclusively on control of NOx. EPA's proposed approval of TCEQ's HRVOC SIP rule, 70 FedReg 58119 (October 5 , 2005 ) * Oil & Gas VOC emissions comprise 84% of the County’ s total VOCs and typically do not include HRVOC components therefore, they are not expected to contribute to ozone formation in HGB.10 

# HGB A tt ainment Demonstration SIP Revision for the 1 997 Eight-Hour Ozone St andard (Project No. 2009-017-SIP-NR) Adoption Date: 03/1 0/20 1011 

# Reduction of 273 tpd VOCs (99,645 tpy VOCs) from several counties within 200 km of HGB, including Matagorda County, resulted in no change to the Wallisville Monitor 2018 future case.

**HGB At** **tainment Demonstration SIP** **Rev ision**  **for the 1997 Eight -** **Hour Ozone Standard (Project No. 2009**  **- 017**  **- SIP**  **- NR)**  **Ad option**  **Date: 03/10/2010** 12 

# Eliminating All VOC and NOx Emissions From Matagorda County Will Not Meaningfully Contribute to Ozone

Reduction

**TCEQ T echnical**  **An alysis**  **Support Documentation by the TCEQ Regarding U.S. EP** 

**A Responses to State and T** **ribal 2008 Ozone Designation Recommendations**  

## All Matagorda **County Emissions Contribute**  **Less than 0.20 ppb in 2018**  **APCA Modeling** 13 

## In case-by

-case analysis, Matagorda County Wind Trajectory Data Does Not Outweigh Declining Growth, Declining Emissions and more Detailed Modeling Data **Declining emissions**  **and population**  **and VMT**  **grow th**  is well documented . **No meaningful**  **contribution to**  **HGB ozone**  **lev els**  **: 2005**  **– 2010**  **data**

– Wi nd data shows only 0 . 43 % - 1 . 9 % , at most, of the wind impacting an elevated monitor potentially originated in Matagorda County. (TCEQ January 11 , 2012 Letter, p . 16 . )

– Within this small percentage of time, the greatest impact expected from all combined mobile, non - road, point and area sources Matagorda County emissions, as modeled by TCEQ, is an average of . 18 ppb for 2005 and 2006 . (TCEQ January 11 , 2012 Letter as corrected in discussions between EPA and TCEQ . ) **No meaningful**  **contribution to**  **ozone formation**  **or reduction**  **: 2018**  **Data**

– 2018 TCEQ sensitivity analysis demonstrated that 273 tpd (99 , 645 tpy) VOC reduction had no ozone reduction impact on the Wa llisville monitor.

– 2018 TCEQ APCA results for all MC emissions indicates, that if all combined mobile, non - road, point and area sources were eliminated, the greatest reduction impact would be 0 . 20 ppb at the Wa llisville monitor.