1995 BASE YEAR OZONE EMISSION INVENTORY

FOR OZONE PRECURSORS AND CARBON MONOXIDE

for

Oklahoma City Area

January 1998

Prepared by:

Oklahoma Department of Environmental Quality

P.O. Box 1677

707 N Robinson

Oklahoma City, OK 73101

EXECUTIVE SUMMARY

This document presents the 1995 base year Oklahoma City Special Emission Inventory for ozone in the Oklahoma City Management Area (OMA).

The inventory addresses volatile organic compound (VOC), oxides of nitrogen (NOx), and carbon monoxide (CO) emissions from stationary point, stationary area, on-road mobile, non-road mobile and biogenic sources. The Oklahoma Department of Environmental Quality, Air Quality Division, was the lead agency responsible for the compilation of the inventory.

Total annual ozone precursor emissions and total average daily peak ozone season precursor emissions for the 1995 base year were determined for each source category. The description and documentation for each source category is provided. The tables below summarize the results of the inventory:

*Not determined on an annual basis.

This document presents the 1995 base year Oklahoma City Special Emission Inventory for ozone in the Oklahoma City Management Area (OMA). The inventory addresses volatile organic compound (VOC), oxides of nitrogen (NOx), and carbon monoxide (CO) emissions from stationary point, stationary area, on-road mobile, and non-road mobile emission sources. Emissions of VOC and NOx are also addressed for biogenic sources.

The emissions inventory for the Oklahoma City Management Area covers the City of Oklahoma City and the area 25 miles from the borders of Oklahoma County. In addition to Oklahoma County, the area encompasses parts of Caddo, Canadian, Cleveland, Grady, Kingfisher, Lincoln, Logan, McClain, Payne, Pottawatomie, and Seminole Counties. The area within the 25-mile boundary was converted to a percentage for each county and used in calculations. The OMA is illustrated in Figure 1-1.

The agency with the direct responsibility for preparing and submitting the Oklahoma City Special Emissions Inventory is the Oklahoma Department of Environmental Quality (DEQ), Air Quality Division (AQD). The AQD was directly responsible for coordinating the completion of each segment of the inventory. Emission estimates were derived using information from the Tulsa Area Emissions Inventory. The methods used by Enercon Services, Inc. in the stationary area sources and a portion of the non-road mobile sources served as a reference for use in the Oklahoma City Emissions Inventory. Several other state and local agencies contributed information that was necessary for preparing emission estimates. For example, the Oklahoma Department of Transportation provided information on the total length and location of state highway projects to determine emissions from asphalt paving. The Oklahoma Corporation Commission provided information on the number of oil and gas wells in the OMA.

The AQD staff completed the emissions inventory for the stationary point, on-road mobile, biogenic, and the majority of the non-road mobile sources. The contact persons for the major contributors to the inventory are listed in Table 1-1. The exact mechanisms by which each of these groups supported the development of the base year inventory are explained in detail in the appropriate source type documentation section.

Total annual ozone precursor emissions from the OMA for the 1995 base year are shown below:

VOC emissions = 120,916 tons/year

NOx emissions = 68,264 tons/year

CO emissions = 424,390 tons/year

Figure 1-2 illustrates the relative magnitude of the annual emissions in the OMA.

Total average daily peak ozone season precursor emissions from the OMA for the 1995 base year are shown below:

• VOC emissions = 817 tons/day or 1,633,490 lbs/day
• NOx emissions = 208 tons/day or 415,213 lbs/day
• CO emissions = 1,215 tons/day or 2,429,647 lbs/day

Daily emissions were averaged for the 3-month peak ozone season for the OMA, which was determined as June 1 to August 31 (based on the highest ozone violations for the years 1993-1995). Figure 1-3 illustrates the relative magnitude of daily emissions from different sources for the OMA.

Table 1-2 and Table 1-3 summarize annual and ozone season daily emissions, respectively, by county. Figure 1-4 illustrates the distribution of annual emissions by county. Table 1-4 and Table 1-5 summarizes annual and ozone season daily emissions, respectively, for the entire study area according to the five major source type categories: stationary point sources, stationary area sources, non-road mobile sources, on-road mobile sources, and biogenic sources. The percentage contribution of each of the source types to the total inventory emissions for VOC, NOx, and CO are as follows (see Figure 1-5):

VOC (%) NOx (%) CO(%)

Stationary Point Sources 21.4% 17.6% 2.3%

Stationary Area Sources 24.6% 10.3% 1.0%

On-Road Mobile Sources 39.9% 53.9% 80.0%

Non-Road Mobile Sources 14.0% 18.2% 16.7%

Table 1-6 through Table 1-8 summarize emissions for each pollutant by county by major source type class.

The remainder of this document is organized as follows:

• Section 2.0 - provides description and documentation for the stationary point source component of the Oklahoma City Special Emissions Inventory. The supporting documentation and example calculations are located in the appendices directly following this section.

• Section 3.0 - describes the derivation of the stationary area source inventory. Supporting documentation for emission factors and activity data are given in the appendices directly following this section.

• Section 4.0 - documents non-road mobile emission estimates with supporting documentation and calculations found in the appendices directly following this section.

• Section 5.0 - addresses on-road mobile emission estimates. Detailed input and output data from the MOBILE5A emission factor model and from determining VMT using the State’s Highway Performance Monitoring System (HPMS) database are provided in the appendices following this section.

• Section 6.0 - documents biogenic emission estimates.

• Section 7.0 - addresses quality assurance. The appendix directly following this section contains a copy of completed inventory QA checklists from EPA’s guidance document Quality Review Guidelines for 1990 Base Year Inventories (September 1991).

FIGURE 1-1. MAP OF THE EMISSIONS INVENTORY AREA FOR THE OMA 1995 BASE YEAR

1995 BASE YEAR

VOC ANNUAL EMISSIONS (tons/year)

VOC OZONE SEASON DAILY EMISSIONS (lbs/day)

NOx ANNUAL EMISSIONS (tons/year)

NOx OZONE SEASON DAILY EMISSIONS (lbs/day)

CO ANNUAL EMISSIONS (tons/year)

CO OZONE SEASON DAILY EMISSIONS (lbs/day)