IN.gov - Skip Navigation

Note: This message is displayed if (1) your browser is not standards-compliant or (2) you have you disabled CSS. Read our Policies for more information.

Amber Alert
Amber Alert - TEST
Find Out Where to Recycle

Indiana Department of Environmental Management

IDEM > Forms > AES-05: Group/Process/Emissions AES-05: Group/Process/Emissions

AES-05: Group/Process/Emissions

Use this form to list all of your facility's groups, processes and associated emissions.

Section 8: Group Information

A group is a set of processes that can be lumped together based on their operating schedule. A couple of examples would include a paint booth with multiple operations, an assembly line or a boiler that uses one or more fuels.

  1. Group Number - This is a numeric field used by OAQ to identify a specific group. This must be a number and should be in sequential order.
  2. ORIS Unit ID - This is the unit code that was assigned by the Office of Regulatory Information Systems. This only applies to groups associated with Clean Air Markets at the U.S. Environmental Protection Agency.
  3. Description - A short description of this group that is easily recognizable to you and to OAQ staff who may need to read/verify the information.
Operating Schedule
  1. Hours/Day - Enter the average number of hours per day that this group operates. The value cannot be higher than 24.
  2. Days/Week - Enter the average number of days per week that this group operates. The value cannot be higher than 7.
  3. Weeks/Year - Enter the number of weeks per year that this group operates. The value cannot be higher than 52.
  4. Hours/Year - Enter the number of hours per year that this group operates. The value cannot be higher than 8,760.
Quarterly Operating Schedule

Expressed as a percent for each quarter and must add up to 100%. If the process did not operate for a given quarter, place a 0 in the field. Refer to the following to properly allocate your activity.

  1. 1st Quarter - Enter the percentage of annual activity for the period during January, February and December of the same calendar year, for example January 2004, February 2004, and December 2004. This must be expressed as an integer, no decimals.
  2. 2nd Quarter - Enter the percentage of annual activity for the period March through May. This must be expressed as an integer, no decimals.
  3. 3rd Quarter - Enter the percentage of annual activity for the period June through August. This must be expressed as an integer, no decimals.
  4. 4th Quarter - Enter the percentage of annual activity for the period September through November. This must be expressed as an integer, no decimals.
  5. Design Capacity - The maximum design capacity of the group. This is a number that represents the maximum operational capacity of the unit. This number is usually used to estimate the potential emissions. For the example use 52.
  6. Design Capacity Numerator - The top half of the fraction describing how the design capacity is measured. This can be expressed as units of area, charge, count, energy, length, mass, radiation or volume. For the example use Gallons.
  7. Design Capacity Denominator - The bottom half of the fraction describing how the design capacity is measured. This is usually expressed as a measure of time (minute, hour, day). For the example use Hour.
  8. Maximum Capacity - Only those groups representing electric generating units need to have this field filled. This should be expressed in megawatts of generating capacity. For the example leave this blank, paint booths don't generate electricity.

Section 9: Process Information

A group can contain one or more processes. A couple of examples would be a boiler that can use natural gas or fuel oil and a paint booth that uses different coatings and may include sanding.

  1. Process Number - This is a two-digit numeric field used by OAQ to identify a specific process within a group. This must be a number and should be in sequential order.
  2. Description - A short description of the process that is easily recognizable to you and to OAQ staff who may need to read/verify the information.
  3. Source Classification Code (SCC) - The Source Classification Code [PDF] is an eight-digit code that is used to identify the activity taking place.
  4. Units - These are the units of reported process rate. For instance: if you intend to enter information on the amount of coal processed, then the units will probably be in tons; if you are intending to report about the amount of paint applied the units may be in gallons or tons of coating applied. We recommend that you use units associated with the SCC number, but if not specify what units are being used.
  5. Stack Number - This needs to be filled in with the corresponding stack ID from the stack form. If the process does not have a stack, you may skip this field.
  6. Process rate (throughput) - This is the actual annual amount of goods consumed or produced. The unit for the process rate was identified above (see step d. of this section).
If the emissions calculation does not use ash content, sulfur content or heat ratio skip to step j.
  1. Ash Content - Ash content of the emissions associated with the segment combustion process, indicated as a weight percentage.
  2. Sulfur Content - The sulfur content of the fuel used in the combustion process, indicated as a weight percentage.
  3. Heat Ratio - The heat ratio will be used in calculating emissions via AP-42 or local emission factors. This should be the heat content of the fuel used divided by the average heat content of that fuel type.
  4. Maximum Operation Rate - The maximum hourly rate for the process, expressed in the same units as the Process Rate.
If the emissions are not controlled skip to Section 11.
  1. Abatement Equipment ID - This is the number used to identify the abatement equipment on the Abatement Equipment Identification Form (Step a. of Section 8). List each piece of abatement equipment in order of air flow.
  2. Capture Efficiency - The percentage (%) of emissions from the process that reaches the first piece of abatement equipment (i.e., How much of the emission stream actually flows into, or is captured by, the abatement equipment as opposed to the total emissions from the process).

Section 10: Emissions Information

  1. Pollutant - A list of pollutants that are emitted from the process. You only need to list those pollutants which are emitted, for instance we would not expect to see CO emissions from painting.
  2. Estimated Emission Method - A code used to identify the technique used to calculate the estimated emissions.
1 Source Test
2 Mass Balance
4 Engineering Estimate
7 Source Closed
8 AP-42
9 Local EF

All of the method codes, except 7 and 8, need to have a simple written statement as to how the emissions were determined (e.g., through stack tests performed on a specific date or mass balance calculations enclosed). This simple explanation may be submitted in a cover letter or as a separate document.

  1. Emission factor - An estimate of the rate at which a pollutant is released to the atmosphere as the result of some activity, expressed as pounds per process rate units (Section 10, step d). You only need to supply emission factors when using method codes 8 or 9.
  2. Overall Control Efficiency - The rate at which the pollutants emitted are controlled. This can be estimated by multiplying the abatement efficiency (Section 8, step e) by the capture efficiency (Section 10, step m)
  3. Estimated Emissions - The tons per year for each pollutant listed. Reminder: All of the calculation units must agree. For example, a boiler using natural gas must have a SCC # that applies to natural gas in mmFt3 and the process rate must be in mmFt3. The maximum operation rate must also be expressed in the same mmFt3/hour.