Virtually every air quality consulting project involves development of emissions estimates for the air pollutant sources under consideration. Emissions inventories are used in the context of all air permitting projects to determine applicable regulatory requirements.

In addition, EES has assisted clients in quantifying offsets requirements and in locating and obtaining regulatory approvals for on-site and off-site emission reductions to satisfy permit conditions for both criteria and hazardous air pollutants.

Development of facility or area-wide emissions inventories may include using mass balance techniques, emissions monitoring data, appropriate emission factors, engineering calculations, or a combination of these methods.

Our experience with many industrial processes keeps EES air quality engineers apprised of emission factors and estimation methods approved by regulatory agencies, and enables us to make reasonable emission estimates for unusual or complex source configurations.

A related set of services offered by EES can be broadly characterized as pollution control engineering, i.e., identification of applicable emission control technologies or process modifications to reduce emissions of criteria and toxic air pollutants, assisting the client with selection of the most cost-effective control strategies, and overseeing the associated equipment purchasing, installation and emissions testing activities.

The following descriptions of representative projects, listed to the right, demonstrate our competence in quantifying emissions and evaluating air pollution control systems.

Emission Inventory
Vulcan Materials Company

EES managed the preparation of the 2001 emission inventory report for two facilities located in San Diego. EES estimated the emissions for two hot mix asphalt batch plants, two batch concrete plants, and two aggregate & sand processing operations. Project involved a site visit to identify emitting processes, equipment specifications, materials used, and operating parameters. Permits to Operate were used to identify operation limitation and estimate maximum hourly emissions. Annual emissions were quantified using source test data, emission factors, and other engineering calculations.

Emission Inventory
SeaWorld Adventure Park

EES managed the preparation of the 2001 emission inventory report for the co-generation facility, miscellaneous combustion sources, and coating applications. EES project manager conducted a site visit to identify emitting processes, equipment specifications, materials used, and operating parameters. Permits to Operate were used to identify operation limitation and estimate maximum hourly emissions. EES staff used source test data, emission factors, and other engineering calculations to quantify emissions from the facility.

Emission Inventory
San Diego Unified Port District

EES performed an emission inventory for the San Diego International Airport. Project involved a site visit to identify emitting processes, equipment specifications, materials used, and operating parameters. Permits to Operate were used to identify operation limitation and estimate maximum hourly emissions. Annual emissions were quantified using source test data, emission factors, and other engineering calculations.

Emission Inventory
Fairchild AFB

EES staff developed a base-wide emissions inventory including stationary and mobile sources. Criteria and hazardous air pollutants were estimated from boilers, IC engines, maintenance shops, aircraft emissions, trucks, ground support equipment, fueling and storage operations, ozone depleting chemicals, paint booths, and degreasing operations. In addition, EES staff developed an access database to aid base personnel in tracking all chemicals used and estimating future emissions and potential future increase in emission rates due to projected future growth.

Comprehensive Emission Inventory Plans and Report
Vulcan Materials Company

EES staff prepared three comprehensive Emission Inventory Plans and Reports (CEIP & CEIR) for an aggregate processing plant and 2 asphalt batch plants. The CEIP was prepared using the Kern County APCD CEIDARS II forms that included a list of emitting processes, list of criteria and toxics air pollutants, process flow diagrams, and emission quantification methods. The CEIR was prepared using the CARB CEIDARS-Lite computer program.

Preparation of Air Toxics Emissions Inventories
UNIOCAL Corporation

EES engineers has provided full air quality consulting services for UNOCAL facilities in Ventura and Los Angeles Counties. Pursuant to California legislation requiring disclosure of routine air toxics releases, we prepared emissions inventories for eight different UNOCAL production and processing facilities. These projects involved identification of the toxic compounds potentially emitted from each piece of equipment, review of the available literature for applicable emission factors, and, where necessary, development and implementation of plans to obtain the required information from source tests, mass balance techniques or engineering calculations. Detailed emissions inventory reports were then prepared to present the derived emission rates, as well as pollution control technology descriptions and performance data, stack parameters, and facility operating information. All of the reports received approval from the respective local air pollution agencies.

Development of Air Toxics Emissions Inventory
and Permitting Support
Mobil Corporation

EES engineers helped Mobil to prepare an air toxics emissions inventory report for the subject marine terminal facility at the Port of Los Angeles, as required by California state law. The required inventory was developed through the application of published emission factors, engineering calculations and measurements conducted by EES staff to determine the composition of fugitive vapors at various points. We also developed and implemented an emission control strategy for compliance with a new South Coast Air Quality Management District rule for reducing wastewater separator emissions of reactive organic vapors. This analysis has resulted in installation of a cover for the marine terminal separator basin, a vapor collection system, and a carbon adsorption system to remove hydrocarbons from the exhaust stream.

MACT Equivalency Determination
Industrial Client

EES staff helped an industrial client successfully obtain a maximum achievable control technology (MACT) equivalency determination under a state regulation implementing MACT for chlorinated organic solvent degreasers. In this case, the state regulation, which was adopted to implement U.S. EPA's federal MACT standard for chlorinated organic solvent degreasers, does not include all of the control options of the federal regulation. Therefore, the company was required to demonstrate that the control system they had in place was equivalent to the one of control methods approved by the state. EES engineers completed a technical analysis that convinced the regulators that the control system currently in place was equivalent to the other methods of control approved by the state. Based on EES's work, the state issued an equivalency determination that allowed the plant to continue to operating the existing control system and avoid retrofit costs.

Best Available Control Technology Analysis
DuPont Corporation

EES conducted a best available control technology (BACT) analysis and additional environmental impacts analysis for a plant modification in order for the client to assess the most beneficial permitting option of pursuing a PSD permit or a Federally-Enforceable PSD minor source permit.

Best Available Control Technology Analysis
Ocean State Power

This 500 MW combined cycle station is powered by gas-fired combustion turbines, with fuel oil as the backup energy source. EES staff completed a best available control technology (BACT) analysis for construction of this cogeneration station. The BACT analysis required the investigation of applicable control technologies for NOx, CO, SO2, and particulate emissions. Control techniques evaluated range from low-sulfur oil for SO2 control to selective catalytic reduction (SCR) and water or steam injection for NOx control. The BACT analysis contained detailed presentations of cost effectiveness and incremental cost data for reducing emissions.