Instructions and Overview of Air Emissions Inventory Forms
General Industry
The emission inventory report consists of several forms. Some forms are required of all sources; other forms are process specific and are required only if a source has the applicable process. If there are forms in your packet which do not apply to the processes at your source, please recycle the unused forms.
This instruction packet is directed toward general industry. If you did not receive emission inventory forms for other facilities which you own/operate, these forms may be duplicated as necessary.
REMEMBER TO HAVE A RESPONSIBLE OFFICIAL SIGN THE INVENTORY REPORT FORM. ALL INVENTORIES MUST BE COMPLETED WITH A PERMANENT MARKER.
Form 1.0 General Information (Required for all sources)
This form includes general information, an emissions statement and a signature section certifying that the submitted information is accurate and complete. Some of the general information has been preprinted on the forms provided. If any preprinted item is incorrect, cross out the erroneous entry and indicate corrections required. If an item is left blank, provide the missing information.
Facility Name: Enter the official company name and/or plant designation for the facility that is submitting the inventory. The official name must be entered on every form submitted.
Facility ID#: This number designates the location of your source in the Integrated Information System (IIS) maintained by the NDEQ.
NAICS Code(s): The North American Industry Classification System (NAICS code) has replaced the Standard Industrial Classification Code (SIC code). The NAICS code is now used to classify business establishments for the purpose of collecting and analyzing statistical data.
Facility Location (Address Or Directions), City & Zip Code: This address is the physical location of the facility. This is not necessarily the mailing address.
County Name: The county where the facility is located.
Classification: Classification describes the type of facility for which the inventory is being submitted. For example, Class I - major source, Class II - minor source, Low Emitter, or No Permit Required.
Facility Contact: The person the NDEQ may contact for questions on the emissions inventory report.
Phone Number & Fax Number: The phone number and fax number of the facility.
Facility Mailing Address, City, State & Zip Code: The mailing address should be entered only if the mailing address of the facility is different from the street address.
Emissions Statement: The total emissions calculated on the worksheets contained within the inventory report. Fill out this statement after completing all applicable forms. Chargeable emissions are for major sources only. If your facility is a Class I major source, you are required to pay emission fees on your actual emissions. No fees are due for CO, NH3, PM2.5 or greenhouse gas emissions.
Please note, the VOC amount reported under total plant emissions should reflect the total VOC from all processes at your facility including HAP emissions. The VOC total reported in the chargeable emissions section should only reflect VOC’s that are not listed within the HAP totals to avoid double counting VOC emissions for fee purposes.
Certification of Truth, Accuracy, and Completeness: The forms must be certified by a responsible official as defined in Title 129, Chapter 1. Unsigned inventories, or inventories signed by someone other than the responsible official, will be considered incomplete, and may be subject to penalties.
Form 1.1 Process Flow Diagram
Please provide either on this form or on a separate sheet a diagram of your facility. Make sure to label all emission points and identify all air pollution control equipment. Be sure to provide an identification number for each emission point. Use the same identification number(s) throughout the entire inventory form.
Form 2.0 Process Information
This form is designed to accommodate many different business types and therefore certain sections may not be applicable to your facility. For sections that do not apply to your operations, please indicate as such with a “NA”.
Facility Operating Schedule: Please provide the hours of operation per day, the days of operation per week, the weeks of operation per year, and the hours of operation per year. Additionally, indicate the normal hours that your facility operates.
Operating Rate Data: Identify all processes at your facility which produce air emissions. The process number should correspond to the identifications given on Form 1.1Process Flow Diagram. If applicable provide the type of material used, design capacity, nameplate capacity, the actual throughputs (process rates), the product description, and the quantity of actual product produced.
Note: Design capacity is based on the reported maximum continuous capacity of the unit. The nameplate capacity is specified by the manufacturer on the unit nameplate.
Air Pollution Control Equipment: Please provide general information on control equipment for each process at your facility. The process number should correspond to the identifications given on Form 1.1 Process Flow Diagram.
Stack Parameters: Include as much information as possible on the stacks for each process. If a process only has a vent, indicate this by writing "vent" under the stack description. If the process does not have a stack or a vent to the atmosphere, indicate this with an "NA".
Process Number: The process number should correspond to the identifications given on Form 1.1Process Flow Diagram. If possible, the process numbers should be consistent with the numbers used to identify processes in your construction or operating permits. Frequently, the NDEQ finds several sets of process numbers identifying the same equipment and emission sources on various forms submitted for the same facility.
Stack Description: Stacks can be made of different material such as brick or cast iron, and some stacks have a lining. A stack can also be vertical or horizontal, capped or uncapped. Be sure that the description of your facility’s stacks is accurate.
Latitude and Longitude: A location can be described as a latitude and longitude or in another projection such as a Universal Transverse Mercator (UTM) which can be recorded in one of several different datums such as NAD83, NAD27, or WGS84. When reporting a UTM projection, it is vital to also report the datum. If you don’t have this type of information available, here are some possible approaches that could be used to obtain the locations of sources within your facility:
1) Engineering/Architectural plans
2) Property Deeds
3) GPS device
4) Google Earth
If you use Google Earth, supply a printed copy of the map with all emission sources marked and labeled. This should include stacks and any other sources such as ground piles, paved or unpaved roads, property lines, fences, etc. An image from Google Earth can be obtained by going to the “Edit” drop-down menu and selecting “Copy Image”, then open a word processing file and paste this image into the document. A photocopy from Google Earth that is clearly marked will be sufficient to determine the location of your facility and specific emission points. However, you may want to use more than one copy of the image for clarity.
Height and Inside Diameter: The stack height is an important modeling parameter and every effort should be made to include this information in your emission inventory. If this information is not available, estimate the stack height and note in the report that an estimate has been made to determine this parameter. A diameter should be provided for round stacks and the length and width should be provided for rectangular stacks.
Exit Gas Velocity, Flow Rate and Temperature: This information is usually available from the manufacturer of the equipment. Providing either the gas velocity or the gas flow rate is sufficient if you have also provided the stack diameter or another method to calculate the area of the stack exit. If a gas exit temperature cannot be determined, please provide the combustion temperature as well as the height of the stack. This information is necessary in creating an accurate model.
Form 2.1 Emission Point Information
This form is to be completed by sources that do not have a specific worksheet to calculate point emissions. In other words, this form must be filled out if your emissions cannot be estimated by using the other worksheets provided by NDEQ (Forms 4.0 through 11.0).
Point Number: The identification number (as used in Form 1.1 Process Flow Diagram) given to a specific emission point.
Process Number: The process (from Form 2.0 Process Information) that a specific emission point is associated with.
Point Description: Please provide a brief description of the emission point. Example: #1 Gas fired boiler.
Source Classification Code (SCC): The 8 digit number that describes the emission point. The SCC can be found in the AIRS Manual or in AP42.
SCC Description: Provide a description of the SCC code as found in the AIRS Facility Subsystem Source Classification Codes and Emission Factor Listing for Criteria Pollutants, 1990 (AIRS Manual) or the Compilation of Air Pollutant Emission Factors, Volume I (AP-42).
Emission Calculations: Calculate the actual emissions of each pollutant from each specific emission point. Remember to use throughputs (process rates) for the actual year being reported.
Provide the emission factor, emission factor source (ex. AP-42 Ch. 8.1), controls utilized for the emission point, and the actual emissions. If another method of determining emissions is used for the emission point, provide all supporting documentation concerning the alternative method to the NDEQ. If emission factors are used which are different from the factors in your permit make sure to indicate the source of the emission factors utilized.
For HAP emissions, use Form 4.0 Hazardous Air Pollutants to calculate and speciate the pollutants.
Transfer the actual emissions in tons/year to Form 12.0 Emissions Fee Calculation Worksheet.
Form 2.2 Control Malfunction Emissions
This form is to be used to report actual air emissions that result from quantifiable equipment malfunctions. Specifically, this worksheet should show excess emissions which result from control equipment malfunctions. The event period field can reflect a specific event or an aggregate period of time including separate malfunctions if the control equipment and conditions are the same. However, please note if you report emissions over an aggregated time, the specific dates and times of the individual malfunction events must be included with your inventory report in a separate listing. Furthermore, if the emission calculations noted on Form 2.2 Control Malfunction Emissions are shown for aggregated periods of time, the additional required list showing the individual malfunction event dates and times does not need to show calculated emissions for each individual event.
Please note that to avoid double counting, these excess emissions from control equipment malfunctions should not be included in any other emission calculations.
Form 2.3 Greenhouse Gas Emissions
Report any greenhouse gas emissions from your facility on this form. The greenhouse gases that must be reported are the following:
CO2 – carbon dioxide
N2O – nitrous oxide
CH4 – methane
PFC’s – perfluorocarbons
HFC’s – hydrofluorocarbons
SF6 – sulfur hexafluoride
Transfer the total greenhouse gas emissions to the emissions statement on Form 1.0 General Information.
Form 3.0 Fuel Combustion Worksheet
This form asks for general information about the combustion equipment used as well as annual throughput information. Estimate the actual emissions from this equipment using the applicable worksheet from Forms 4.0 through 11.0. If there is no form applicable to your type of operation, please use Form 2.1 Emission Point Information.
Unit ID No.: Owner/operator defined number to identify each specific combustion unit.
Equipment Description: Describe the type of combustion equipment used.
Combustion Equipment Category: The equipment classification in the AIRS Manual or AP42.
Year Installed: Year the combustion equipment was installed.
Maximum Design Rate: Provide the maximum BTUs/hr that the equipment was designed to produce.
Fuel Type: List the primary and secondary fuels used in the combustion process.
Annual Throughput: Provide the quantity of fuel the combustion unit burned during the calendar year that is being reported. Indicate the fuel units (MMcf, gallons, etc.).
SCC Code: The SCC (Source Classification Code) is the 8 digit number that describes the point of emission. The SCC can be found in the AIRS Manuel or AP-42.
Heat Content: BTU content per unit of fuel.
% Sulfur (COAL AND FUEL OIL ONLY): Percentage by weight of sulfur contained in the fuel.
% Ash (COAL AND FUEL OIL ONLY): Percentage by weight of ash contained in the fuel.
Complete Form 2.0 Process Information and the applicable worksheets (Forms 4.0 through 11.0 or Form 2.1 Emission Point Information if there is no applicable form) to provide stack information, control equipment information, operating rate data, and emission calculations.
Form 4.0 Hazardous Air Pollutants (HAPs) Worksheet
List all chemicals that are manufactured, emitted and/or used at your facility that appear on the enclosed list of 188 Hazardous Air Pollutants.
HAP Chemical & Process Number: Provide the name of the hazardous air pollutant emitted, and the process with which the HAP emission is associated.
CAS No.: The CAS (Chemical Abstract Service) number is the identification number specific to the chemical.
Amount used: Identify in pounds per year how much of the chemical is used.
Amount emitted: Identify in pounds per year how much of the pollutant is emitted into the air.
In the box below "Greatest Single HAP", indicate which HAP was emitted in the largest quantity. For example, if a plant emitted the following quantities of HAPs:
HAP Amount Emitted (lb/yr)
Xylene 2500 lb/yr
Chlorine 25 lb/yr
Cumene 125 lb/yr
Hexane 10500 lb/yr
Methanol 26750 lb/yr
The “Greatest Single HAP” would be methanol in this case.
Once the “Greatest Single HAP” is determined, all other HAPs are totaled together. These are considered “Other HAPs”. Using the above example the “Other HAPs” would be totaled to be 13,150 lb/yr. Methanol would not be included in the calculation of “Other HAPs”.
Transfer emission tonnages to Form 12.0 Emissions Fee Calculation Worksheet to aid in determining the total plant emissions and any chargeable emissions.
Remember, if you emitted 10 or more tons of any single HAP or if you emitted 25 or more tons of all HAPs together, then you may be a major source.
Form 5.0 Volatile Organic Compound (VOC) Worksheet