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You are here: Home / Air Quality / Air Modeling / Air Modeling Research and Contract Projects / Air Quality Research and Contract Reports: Emissions Inventory (biogenic, non/off-road mobile, area, and point sources)

Air Quality Research and Contract Reports: Emissions Inventory (biogenic, non/off-road mobile, area, and point sources)

Reports related to inventories of air-pollutant emissions from biogenic, non/off-road mobile, area, and point sources written by contractors for the Texas Commission on Environmental Quality.

Reports from Air Quality Research and Contract Projects related to Emissions Inventory are posted here as PDF files (Help with PDF) unless otherwise specified. Some reports have companion data files in various formats. Reports related to On-Road Mobile Emissions Inventory are on a separate page.

For comments and questions regarding these reports, please e-mail us at aqp@tceq.texas.gov, put "EI Contract Report Inquiry" in the subject line, and include the web address of the report PDF file in the e-mail text or attache the original report PDF file.

Emission Inventory of Bulk Gasoline Terminals and Bulk Gasoline Plants - This report, provided by Eastern Research Group, Inc. (ERG), ducuments the development of an annual emissions inventory for bulk gasoline terminals and bulk gasoline plants located in the State of Texas, for base year 2011. The project focused on VOC evaporative and fugitive emissions from motor gasoline loading racks, storage tanks, and equipment leaks at bulk gasoline terminals and bulk gasoline plants. (August 2013)

Upstream Oil and Gas Heaters and Boilers - This report, provided by Eastern Research Group, Inc. (ERG), ducuments the development of refined emissions factors and methods to estimate emissions from upstream oil and gas heaters and boilers for area source inventory development at the county-level. The project developed region-specific heater and boiler activity data for eight geographic regions in the state as well as an updated nitrogen oxide (NOx) emission factor for these source types. (August 2013)

Condensate Tank Oil and Gas Activities - This report was developed at TCEQ’s request under a contract with Eastern Research Group, Inc. (ERG). The report documents the development of refined emissions factors and methods to estimate emissions from condensate storage tanks for area source inventory development at the county-level. The project developed region-specific emission factors and control factors for eight geographic regions in the state. Attachment C Microsoft Excel   Attachment D Microsoft Excel (October 2012)

Forecasting Oil and Gas Activities - This Eastern Research Group (ERG) report provides projection factors for oil and gas production from a 2011 baseline year out to 2035. Using historical data from the Texas Railroad Commissions, different projection methodologies are considered with the most robust one being based on the Hubbert peak curve theory. Yearly production factors by year are provided for the Barnett, Eagle Ford, and Haynesville shale formations, with separate factors for oil, natural gas, and condensate. Growth Factor Data (August 2012)

Development of Texas Statewide Drilling Rigs Emission Inventories for the years 1990, 1993, 1996, and 1999 through 2040 - This report, provided by Eastern Research Group, Inc. (ERG), documents the development of statewide criteria and hazardous air pollutant emission inventories (EI) for drilling rig engines associated with onshore oil and gas exploration activities in Texas. These EI were prepared using well drilling activity data from Texas Railroad Commission, combined with emissions data collected through a bottom-up survey effort in 2009 study. This study represents a significant improvement upon the 2009 effort and depicts emission trends of county-level controlled and uncontrolled EI over multiple years. (August 15, 2011)

Characterization of Oil and Gas Production Equipment and Develop a Methodology to Estimate Statewide Emissions - This report, provided by Eastern Research Group, Inc, documents the development of improved emissions factors and improved methods to estimate emissions for the upstream oil and gas category in the area source inventory. The project developed county-level inventories for the following specific source categories: compressor engines, artificial lift (pumpjack) engines, dehydrators, dehydrator's reboilers, storage tanks, loading, well completions, well blowdowns, pneumatic devices, heaters and fugitive sources. A statewide calendar year 2008 oil and gas area source inventory was also completed. (November 2010)

Emission Factor Determination for Produced Water Storage Tanks - This report, provided by ENVIRON, documents the development of volatile organic compounds (VOC) and hazardous air pollutants (HAPs) emission factors for produced water storage tanks servicing oil and gas wells. (August 2010)

Oil and Gas Tank Emission Measurements - This report, provided by Environ, documents findings from the direct measurement of volatile organic compound emissions from condensate and produced water tanks at seven tank battery sites in the Dallas-Fort Worth area during July 2010 using a single thief hatch sampling apparatus. This report includes several auxiliary documents (zipped). (August 2010)

Control of VOC Flash Emissions from Oil and Condensate Storage Tanks in East Texas - This report estimated the volatile organic compounds (VOC) emission reduction resulting from the implementation of requirements in Title 30 Texas Administrative Code (TAC) 115.112(d)(5) to control VOC flash emissions from crude oil and condensate storage tanks at wellhead sites in the Houston-Galveston-Brazoria 1997 eight-hour ozone nonattainment area. The study also evaluated the potential VOC emission reductions should the 30 TAC 115.112(d)(5) rule be extended to the Beaumont-Port Arthur 1997 eight-hour ozone nonattainment area and the Haynesville Shale area. (August 2010)

Offshore Oil and Gas Platform Report - This report, written by Eastern Research Group, Inc., quantifies emissions specifically for offshore oil platforms and gas platforms in Texas state waters. Dual oil and gas platforms are not included in the emissions inventory. The inventory year for this project was 2008. (August 2010)

Fuel Oil Tank Emissions Testing Feasibility Study - This report, provided by Eastern Research Group, details the evaluation of the vapor sampling capabilities of the GOST apparatus in a 500 barrel unheated atmospheric oil storage tank at an oil and gas lease in Midland, Texas. (August 2010)

Barge Emission Estimates - This report, provided by Eastern Research Group, Inc., quantifies volatile organic compound (VOC) emissions from liquid cargo barges while in transit in the Houston-Galveston-Brazoria, Beaumont/Port Arthur, and Corpus Christi industrial waterways. VOC as well as speciated hazardous air pollutant (HAP) emissions are estimated at the county level for the 2008 calendar year. (August 2010)

Ethylene, Propylene, and 1,3-butadiene Pipeline Emissions Inventory - Eastern Research Group, Inc. was contracted by the TCEQ to locate and quantify speciated and total VOC emissions, specifically highly reactive volatile organic compounds (HRVOC) emissions, from pipelines transporting ethylene, propylene, and 1,3-butadiene in the Houston-Galveston-Brazoria ozone nonattainment area. Information from this project was used to develop a 2008 area source inventory for HRVOC pipelines. (August 2010)

Implement Port of Houston's Current Inventory and Harmonize the Remaining 8-county Shipping Inventory for TCEQ Modeling - This report, provided by Environ International Corp., documents the improvements of shipping emission estimations using new detailed data from the Port of Houston and integrating it with data from other ports in the Houston-Galveston-Brazoria Area. The improvement is mostly from the use of 2007 ship movement data vs. 1997 data previously used. Emissions for the year 2007 are modestly lower, but future controls and updated activity projections lead to lower future emissions estimates for 2018. (August 2010)

Enhancement of GloBEIS - This report, provided by Environ International Corp., documents the development of a new front-end for the Global Biosphere Emissions and Interactive System (GloBEIS) model. The enhanced front end will make it possible to prepare multiple days' emission inventories at once, which will reduce the likelihood of error and speed up the modeling process. GLOBEIS is also improved by enhancing the model's ability to estimate emissions for sesquiterpenes and other VOCs. (June 2010)

Differential Absorption Lidar Study - This report by TCEQ documents the DIAL measurements of industrial emissions sources in the Houston-Galveston-Brazoria nonattainment area during summer 2007. Measurements focused on those industrial sources that are difficult to measure using conventional sampling techniques. (March 2010)

Shipping Lane Processing for EPS3 and TexAQS II Ship Emissions Rate Data Comparison to Enhance the Shipping Emissions Inventory for TCEQ Modeling - This report, provided by Environ International Corp, covers the development of a link-based elevated shipping processing enhancement to EPS3. The process was demonstrated by including a sophisticated OGV EI across the gulf and oceans using the STEEM EI, and integration with the EPA near port Ei in state waters. (August 2009)

Development of Emissions Inventory of Agricultural Equipment in All Texas Counties - Part Two Task 6 - This report, provided by E.H. Pechan & Associates, Inc., summarizes the work to improve the default criteria pollutant emission estimates from agricultural equipment such as tractors, combines, mowers, and sprayers, in the TexN database. The project was in two parts. In the first phase, a telephone survey was conducted of agricultural equipment owners in Texas and in the second phase, the data collected was used to refine equipment populations, annual hours of use, and seasonal, weekly and diurnal activity profiles for these equipment types. The report has a companion Excel data file (zipped). (August 2009)

Update of Diesel Construction Equipment Emission Estimates for the State of Texas - Phase I and II - This report, developed through a work order with Eastern Research Group, Inc. (ERG), documents a study conducted to refine the previous emissions inventory for DCE using surveys and other available data sources to collect data on equipment activity and use across the state. This project was conducted in two Phases. The first Phase began by identifying those elements of the previous inventory with the highest levels of uncertainty and the greatest impacts on emission estimates, and then developed strategies for improving upon these elements, collecting the necessary data to modify them to produce more accurate emissions estimates. Phase II of the study involved utilizing existing information to refine the non-road equipment inventory and use profiles, as well as the core emissions model within the Texas NONROAD (TexN) model. (July 2009)

Upstream Oil and Gas Storage Tank Project Flash Emissions Models Evaluation - The purpose of this study was to evaluate methods and models for estimating flashing emissions from storage tank batteries. The study gathered process, operational, and measurement data from tank batteries servicing gas or oil wells across the state. The report compares measured flashing emissions to the emissions determined by conventional emissions estimation methods, including emissions models. (July 2009)

Minor Point Source Emissions - Phase 2 - This report, provided by Eastern Research Group, Inc. (ERG), documents the development of criteria and hazardous air pollutant emissions from minor point sources which emits air contaminants into the air and is not required to report annual actual emissions. Minor point sources cover many types of facilities (i.e., equipment and processes). The categories covered were asphalt paving, concrete related and mineral related products. Data was collected from: previous studies, and through contacting representatives of manufacturers, and/or service companies. The Contractor identified common processes within each category. The results of these investigations and survey results served as inputs to the development of an emissions inventory. A statewide emissions inventory of minor source was developed for calendar year 2005, 2008 and projected future years. (July 2009)

Minor Point Source Emissions - Phase 3 - This report, provided by Eastern Research Group, Inc. (ERG), documents the development of criteria and hazardous air pollutant emissions from minor point sources which emits air contaminants into the air and is not required to report annual actual emissions. Minor point sources cover many types of facilities (i.e., equipment and processes). The categories covered were food and kindred products, wood products and fabricated metals. Data was collected from: previous studies, and through contacting representatives of manufacturers, and/or service companies. The Contractor identified common processes within each category. The results of these investigations and survey results served as inputs to the development of an emissions inventory. A statewide emissions inventory of minor source was developed for calendar year 2005, 2008 and projected future years. (July 2009)

Drilling Rig Emission Inventory for the State of Texas - This report, provided by Eastern Research Group, Inc. (ERG), documents the developement of criteria and hazardous air pollutant emissions from drilling rig engines. Data was collected from: previous studies, websites, publications and through contacting representatives of equipment manufacturers, exploration and production, and/or service companies. The Contractor identified the major basins and fields across the state where significant oil and gas exploration activity occurred during 2008 using Texas Railroad Commission permitting information and other data sources. The results of these investigations and survey results served as inputs to the development of an emissions inventory. A statewide emissions inventory of onshore oil and gas exploration facilities in Texas was developed for calendar year 2002, 2005, 2008 and projected future years. (July 2009)

Top-down Emissions Verification (TDEV) of Industrial Emissions in Houston Based on TexAQS II Data - This report, developed through a work order with Earth System Science Center at University of Alabama in Huntsville, assesses the accuracy of emissions of HRVOCs emitted by sources in the Houston Ship Channel (HSC). The assessment was to be made by comparing ambient measurements of HRVOCs collected by the SOF monitoring and by aircraft (e.g., Baylor Aztec, NOAA P-3) with modeled concentration predicted from the UAH LESchem model. The LESchem model can be run at grid sizes down to 150 meters and time-steps of 5 minutes, which can resolve turbulent eddies. This in turn allows the determination of “turbulent” chemistry as well as the “mean” chemistry in an air parcel. The “mean” chemistry is the chemistry addressed by photochemical models such as CAMx and CMAQ. The meteorological parameters for the UAH LESchem model are provided by the RAMS meso-scale model, in fact the UAH model is actually referred to as the RAMS-LESchem model. The RAMS-LESchem model was applied to a set of five nested domains centered on the HSC, with grid sizes from 12.15 km down to 150 meters. Due to a number of reasons discussed in the report, meteorological parameters (e.g., PBL) of sufficient accuracy could not be simulated. As the author suggests, it may have been premature to apply an LESchem model to a region as complex as the HSC. (September 2008)

Stage I and Stage II Gasoline Dispensing Emissions Inventory - This report, provided by Eastern Research Group, Inc, documents a statewide survey of gasoline stations. Gasoline throughput data for the year 2007 from individual gasoline stations was subsequently used to calculate an emissions inventory of volatile organic compounds of the gasoline dispensing categories which include underground tank loading (Stage I) and vehicle refueling (Stage II). (August 2008)

Auto Refinishing Coatings: VOC Emission Inventory - This project, by Eastern Research Group, Inc., developed an inventory for auto refinishing sites. The sites that are not captured in the point source emissions inventory will be identified, the annual VOC emissions will be determined and growth factors will be developed for this type of area source. (August 2008)

Architectural Coatings: VOC Emission Inventory - This project by Eastern Research Group, Inc. improved the area source emissions inventory by identifying, collecting and evaluating architectural coatings applied to the exterior of stationary structures, portable buildings, pavements, and curbs. (August 2008)

Emissions from Oil and Gas Production Facilities - The purpose of this project, developed through a work order with Eastern Research Group, Inc., was to compile a comprehensive emissions inventory for onshore and offshore oil and gas exploration and production facilities in Texas for the base year 2005. This project addressed the development of an emissions inventory for oil and gas industry sources in Texas that have not been well characterized previously. The focus was on many smaller and much more diffuse sources that occur in the course of exploring for oil and gas and bringing these products to the marketplace. The emissions estimates were developed using top-down, area source methods. Much of the activity data used to develop the emission estimates came from records maintained by the Texas Railroad Commission (TRC). The 2005 base year emission estimates were also projected to future years. Projection years included 2010, 2015, and 2020. A procedure involving the use of U.S Department of Energy (DOE), Energy Information Administration (EIA) oil and gas production growth estimates for the Texas region was used to perform the projections. (August 2007)

Statewide Diesel Construction Equipment Inventory - This report, provide by Eastern Research Group (ERG), documents the development of the data needed to extend existing quantification methods for statewide, county level inventories. In this study, detailed data on DCE populations and activity were collected in order to estimate emissions levels. The results of the study significantly improve the precision of previous emission inventory efforts for the construction sector, and provide a more accurate baseline for future modeling assessments. (August 2005)

Data Collection, Sampling and Emissions Inventory Preparation Plan for Selected Commercial and Industrial Equipment: Phase II - This report, developed through a work order with Eastern Research Group, Inc. (ERG), documents a study to estimate equipment populations, activity profiles, and resulting emissions for certain industrial and commercial non-road equipment. This study focused mainly on characterizing equipment population and activity profiles for Forklifts, Transportation Refrigeration Units, Terminal Tractors, and stationary diesel generators in the 9-county DFW area. The findings from the forklift analysis were specifically extended to the 8-county HGB non-attainment area as well. (August 2005)

Source Attribution and Emission Adjustment Study - Task 1: Back-Trajectory Climatology and Identification of Key Source Regions - This report was completed by Yulong Xie and Carl Berkowitz of Battelle Memorial Institute, and was supported by grant money from EPA and TCEQ. This study examines the automated gas chromatography data collected by the Enhanced Industry Sponsored Monitoring network in 2003. The dense network of auto-GCs allowed the chemical data to be combined with a detailed back trajectory analysis to estimate the locations, and possibly, the strength of VOC sources in the industrial areas of Houston. (January, 2005)

Ground Truth Verification of Emissions in the Houston Ship Channel Area (Revised) - This report, developed through a work order with Sonoma Technology, Inc., summarizes the work conducted and the findings based on site visits to eight facilities that represent an array of reactive volatile organic compound emission sources for petrochemical facilities of varying sizes near the Houston Ship Channel area. It includes (a) a description of the on-site truth activities conducted during winter 2001-2002, (b) statistical summaries of emission discrepancies, and (c) recommendations to improve emission estimation and/or reporting procedures. (August 2002)

Development of Source Speciation Profiles from the 2000 TCEQ Point Source Database - This report, developed through a work order with Pacific Environmental Services, Inc. under a subcontract to Environ International Corp., provides detail on a project that reviewed existing data from the 2000 TCEQ Point Source Database (PSDB) and developed source specific and SCC specific volatile organic compound speciation profiles that may be used to improve the point source speciation of these emissions for future modeling episodes. (August 2002)

High Resolution Solar Radiation Data for Biogenic Emissions Modeling for 2000 Ozone Episodes in the Houston Area - This report, from the University of Maryland, provides the results of a study undertaken to produce high-resolution fluxes of photosynthetically active radiation over the Houston area. The report describes the development of the high resolution data, appropriate support information and a discussion of the data sources, analysis and quality assurance procedures. The data developed by this project include shortwave downward radiation, photosynthetically active solar radiation, and cloud cover at hourly, daily, and instantaneous averaging times, at 1/8 degree and 1/16 degree (4-km) spatial resolution, for the period August 15 - Sept 18, 2000. The 1/8 degree data include the entire US; the 1/16 degree data include the extended Texas area. These data are available upon request. (August 2002)

Biogenic VOC Emission Estimates for the TexAQS 2000 Emission Inventory: Estimating Emissions during Periods of Drought and Prolonged High Temperatures and Developing GloBEIS3 - This report, provided by ENVIRON International Corp., describes the development of Globeis3, which includes modules that will help account for biogenic emission changes due to drought and prolonged high temperatures. TCEQ commissioned this revision to Globeis in order to apply the best available information to the biogenic inventory for the drought-stricken summer of 2000. The model itself and its User's Guide are available from Environ's GloBEIS Web Site Exit the TCEQ. (April 2002)

Development of Source Speciation Profiles from the 2000 TCEQ Point Source Database - Memo - This memo, provided by Pacific Environmental Services, Inc, summarizes the development of point source emissions profile based on the TCEQ's 2000 Point Source Database (PSDB). (February 2002)

Development of Source Speciation Profiles from the 1999 TCEQ Point Source Database - This report, from Pacific Environmental Services, Inc. under a subcontract to Environ International Corp., provides detail on a project that reviewed existing data from the 1999 TCEQ Point Source Database (PSDB) and developed source specific and SCC specific volatile organic compound speciation profiles that may be used to improve the point source speciation of these emissions for future modeling episodes. This report has a set of Microsoft Access database files, compressed in a single zip file. (August 2001)

High Resolution Solar Radiation Data for Biogenic Emissions Modeling for 1998 Ozone Episodes in the Houston Area - This report, from the University of Maryland, provides the results of a study undertaken to produce high-resolution fluxes of photosynthetically active radiation over the Houston area. The report describes the development of the high resolution data, appropriate support information and a discussion of the data sources, analysis and quality assurance procedures. (August 2001)

Area and Mobile Source Emission Inventory Technical Support Project: 1990 - 2010 Emission Inventory Trends and Projections - This report, developed through a work order with Environ International, documents development of an update to the 1999 area, non-road and biogenic emission inventories and development of 1990 to 2010 trend/projected inventories for On-Road, Non-Road and area sources. All the inventories include VOCs, NOx, CO, SO2, and particulate matter (both PM10 and PM2.5). The trend inventories include development of 1990 to 2010 annual and ozone season day emission trends and projections for all area, on-road mobile, and nOn-Road mobile sources. (August 2001)

Development of Gridded Spatial Allocation Factors for the State of Texas (Updated) - This report, developed through a work order with Sonoma Technology Inc., provides details of a project to develop gridded spatial allocation factors for the state of Texas. The factors will be used to geographically distribute area and non road mobile source emissions which were developed from spatial surrogate data. Gridded spatial factors for a 2000 base-year were developed for the entire state as well as portions of Louisiana, Arkansas, and Oklahoma. This report has a companion data file in Comma Separated Values format (CSV). (August 2001)

Review of the Effects of Drought and High Temperatures on Biogenic Emissions, and Future Biogenic Research Efforts in Texas - This report, written by Alex Guenther of the National Center for Atmospheric Research, covers two topics. The first topic is a literature review of journal articles and other studies that focussed on how drought and high temperatures affect biogenic organic compound emissions from vegetation. After reviewing the available evidence, the author recommends methods for modifying GLOBEIS that will take into account drought and high temperature effects, as they are currently understood. The second topic is a discussion of research approaches that could be used to validate biogenic emissions modeling in Texas. (August 2001)

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