For stationary combustion sources required to report under subpart C, Cal e-GGRT requires you to identify which reporting option each unit or group of units will be using to report emissions. The different subpart C reporting options are referred to as “Configurations” in Cal e-GGRT. The individual configurations are designed to match the reporting options made available by the rule in 40 CFR 98.36. As specified in part 98, each configuration has slightly different reporting requirements. Once a configuration is added, Cal e-GGRT will allow you to enter the required reporting elements for the configuration type selected. A facility may have multiple configuration types and/or multiple configurations of any given type. A single unit may not be reported under multiple configurations.

Starting on the Subpart C Overview page, click the link titled "ADD a Configuration" below the CONFIGURATION SUMMARY table.

The unit or group configuration types are first briefly identified below with the relevant regulatory citation, and then again in more detail:

• Configuration Type 1 - A single unit using Tiers 1, 2 or 3 to calculate emissions [98.36(b)]
• Configuration Type 2 - A single unit using Tier 4 (CEMS) to calculate emissions [98.36(b)]
• Configuration Type 3 - A group of units using the aggregation of units reporting alternative [98.36(c)(1)]
• Configuration Type 4 - A group of units using the common pipe configurations reporting alternative [98.36(c)(3)]
• Configuration Type 5 - A group of units using Tier 4 (CEMS) to calculate emissions and reporting under the monitored common stack or duct configurations reporting alternative [98.36(c)(2)]
• Configuration Type 6 – Part 75 units using the alternative CO₂ mass emissions calculation methods provided in 98.33(a)(5) [98.36(d)(2)]

Configuration Type 1 - Single Unit Using Tiers 1, 2, or 3 [98.36(b)]

The single unit reporting configuration is the most basic configuration type. Any unit may be reported individually in Cal e-GGRT. If the unit uses Tiers 1, 2, or 3 to calculate CO₂ emissions, it must be reported as a configuration of Type 1. If the use of Tier 4 is required or elected, Configuration Type 2 or 5 must be used.

A unit under Configuration Type 1 may combust multiple fuels, and it is possible for the different fuels to be using different tiers. For example, a unit that is 500 mmBtu/hr in size may be required to use Tier 3 for coal, but only Tier 2 for natural gas or fuel oil.

Facilities with numerous units should investigate if Configuration Type 3 (aggregation of units) or Type 4 (common pipe) may be used.

Configuration Type 2 – Single Unit Using Tier 4 [98.36(b)]

Configuration Type 2 is the reporting option for single units that are either required, or elect to use Tier 4 (CEMS). CO₂ emissions will be reported for all fuels combined, but CH₄ and N₂O emissions will still need to be reported on a fuel by fuel basis.

Should a unit change methodology from Tiers 1-3 to Tier 4 during the year, the unit will need to be added as two separate configurations in Cal e-GGRT with different configuration names.

If a single CEMS is used to monitor multiple units (multiple combustion, or one combustion and one or more process units), Configuration Type 5 should be used instead.

Configuration Type 3 – Aggregation of Units [98.36(c)(1)]

The aggregation of units option is a reporting configuration that allows multiple units to be reported as a single entity, provided that certain conditions are met. If this reporting option is selected, emissions from all units grouped in this configuration will be reported as combined emissions in Cal e-GGRT.

If a facility contains two or more units, each of which has a maximum rated heat input capacity of 250 mmBtu/hr or less, you may report these units as a single reporting configuration of Type 3 in Cal e-GGRT, provided that only Tiers 1-3 are used and the units use the same tier for any common fuels combusted. Fuels of different types may use different tiers, as permitted. There is no limit on the number of units that may be included in this configuration provided the previous criteria are met.

While the use of Tier 3 is permitted to be used in an aggregation of units configuration, it is generally not required for configurations of this type as Tier 3 is only required for certain units larger than 250 mmBtu/hr. Units of that size may not be included in the aggregation of units configuration.

Configuration Type 4 – Common Pipe [98.36(c)(3)]

The common pipe reporting configuration is another alternative reporting option that allows for multiple units to be reported as a single group entry.

This configuration is different from the aggregation of units configuration in that there is no size constraint. The common pipe configuration may only be used if two or more stationary combustion units at a facility combust the same type of liquid or gaseous fuel and the fuel is fed to the individual units through a common supply line or pipe.

The common pipe configuration may only be used if the units only combust the liquid or gaseous fuel supplied by the common pipe. Units that combust fuel other than the fuel supplied by the common pipe must be accounted for under a separate configuration. For example, a unit that burns coal and natural gas may not be included in a common pipe configuration for units that only combust natural gas. In such a situation, you may report the units that only combust natural gas as a common pipe configuration. To calculate emissions for the common pipe, you would subtract the quantity of diverted gas (i.e. gas combusted at a coal unit) from the quantity of gas measured for the common pipe by using company records. The diverted gas would need to be accounted for in a separate configuration (unless diverted offsite or to an exempt unit).

The tier required for the common pipe configuration is based on the maximum rated heat input capacity of the largest unit served by the common pipe.

Configuration Type 5 – Common Stack [98.36(c)(2)]

If multiple units vent to a common stack or duct and Tier 4 is used to calculate the CO₂ emissions for those units, the common stack configuration must be used. If only a single combustion unit vents to the stack and no process units are vented to the stack, then Configuration Type 2 (single unit using Tier 4) should be used.

Configuration Type 6 – Alternative Part 75 Reporters [98.36(d)(2)]

This configuration represents the alternative calculation and reporting requirements available to certain units that report heat input year-round to EPA according to part 75. Units subject to subpart D (electricity generating units that are subject to the Acid Rain Program or EGUs that are otherwise required to monitor and report to EPA CO₂ emissions year-round according to Part 75) would not be eligible to report under this option. Units subject to subpart D should report following the instructions for subpart D.

If this option is selected in place of using one of the 4 tiers, the applicable calculation methodology specified in 98.33(a)(5) must be used to calculate CO₂ emissions and the reporting requirements specified in 98.36(d)(2) replace the requirements specified in 98.36(a)-(b).

Configuration Types 1, 3 and 4

Note: Configuration Type 1 pictured.

For configurations of Type 1 (single unit using Tiers 1, 2, or 3), subpart C requires the following additional information aggregated at the configuration-level:

• The total annual biogenic CO₂ mass emissions. This includes both CO₂ emissions from the combustion of biomass fuels and the biogenic portion of CO₂ emissions from fuels with a mixed biogenic and fossil component [98.36(b)(8)(ii)]
• The total annual CO₂ mass emissions from sorbent [98.36(b)(10)]

For configurations of Type 3 (aggregation of units), subpart C requires the following additional information aggregated at the configuration-level:

• The total annual biogenic CO₂ mass emissions. This includes both CO₂ emissions from the combustion of biomass fuels and the biogenic portion of CO₂ emissions from fuels with a mixed biogenic and fossil component [98.36(c)(1)(vi)]
• The total annual CO₂ mass emissions from the combustion of fossil fuels. This includes both CO₂ emissions from all fossil fuels and the fossil portion of CO₂ emissions from fuels with a mixed biogenic and fossil component [98.36(c)(1)(vi)]
• The total annual CO₂ mass emissions from sorbent [98.36(c)(1)(x)]

For configurations of Type 4 (non-CEMS group of units sharing common fuel supply pipe), subpart C requires the following additional information aggregated at the configuration-level:

• The total annual biogenic CO₂ mass emissions. This includes both CO₂ emissions from the combustion of biomass fuels and the biogenic portion of CO₂ emissions from fuels with a mixed biogenic and fossil component [98.36(c)(3)(vi)]
• The total annual CO₂ mass emissions from the combustion of fossil fuels. This includes both CO₂ emissions from all fossil fuels and the fossil portion of CO₂ emissions from fuels with a mixed biogenic and fossil component [98.36(c)(3)(vi)]

Use the text boxes to enter the required information for your configuration type.

When finished, click SAVE.

Configuration Types 2 and 5

For configurations of Type 2 (single unit using Tier 4) and Type 5 (monitored common stack or duct configurations), subpart C requires the following additional information aggregated at the configuration-level:

• The cumulative CO₂ mass emissions for each quarter during the reporting year. The cumulative value is the sum of hourly emissions for the respective quarter only (for example, for the fourth quarter, the emissions will be summed for the fourth quarter only, not from all four quarters in the year). This value will include both biogenic and non-biogenic emissions [98.36(e)(2)(vi)(B)]
• The total annual biogenic CO₂ mass emissions. This includes both CO₂ emissions from the combustion of biomass fuels and the biogenic portion of CO₂ emissions from fuels with a mixed biogenic and fossil component [98.36(b)(9)(ii), 98.36(c)(2)(viii)]
• The total annual non-biogenic CO₂ mass emissions (i.e. CO₂ mass emissions from fossil fuels, sorbent use, and process emissions) [98.36(b)(9)(ii), 98.36(c)(2)(viii)]
• The total annual CO₂ mass emissions measured by the CEMS. This will include both biogenic and non-biogenic emissions [98.36(b)(9)(1)-(ii), 98.36(c)(2)(viii)]
• An indication (check box) if emissions reported for the CEMS include emissions calculated according to 98.33(a)(4)(viii) for a slipstream that bypassed the CEMS [98.33(a)(4)(viii)]
• The total number of source operating hours in the reporting year [98.36(e)(2)(vi)(A)]
• The total operating hours in which a substitute data value was used in the emissions calculations for the CO₂ concentration parameter (if an O2 monitor is used to calculate CO₂ concentration, report missing data for the O2 monitor here) [98.36(e)(2)(vi)(C), 98.3(c)(8)]
• The total operating hours in which a substitute data value was used in the emissions calculations for the stack gas flow rate parameter [98.36(e)(2)(vi)(C), 98.3(c)(8)]
• The total operating hours in which a substitute data value was used in the emissions calculations for the stack gas moisture content parameter (if moisture correction is required and a continuous moisture monitor is used) [98.36(e)(2)(vi)(C), 98.3(c)(8)]
• An indication (check box) of whether biogenic CO₂ mass emissions were estimated using the methodology described by Equations C-12, C-13, and C-14 (See section 98.33(e)(2))

If biogenic CO₂ emissions were estimated using the methodology described by Equations C-12, C-13, and C-14, the following additional information is required by subpart C for configurations of Type 2:

• The total annual volume of CO₂ emitted from the combustion of all fuels [98.36(e)(2)(ix)(A)]
• The total annual volume of CO₂ emitted from the combustion of all fossil fuels [98.36(e)(2)(ix)(B)]
• The total annual volume of CO₂ emitted from the combustion of all biomass fuels [98.36(e)(2)(ix)(C)]
• The total annual biogenic CO₂ mass emissions calculated using the procedures in 98.33(e)(2) [98.36(e)(2)(ix)(G)]

Use the text boxes and check box to enter the required information for your configuration type.

When finished, click SAVE.

Configuration Type 6 (year-round Part 75 heat input reporters)

For configurations of Type 6 (year-round Part 75 heat input reporters), subpart C requires the following additional information aggregated at the configuration-level:

• The total annual biogenic CO₂ mass emissions. This includes both CO₂ emissions from the combustion of biomass fuels and the biogenic portion of CO₂ emissions from fuels with a mixed biogenic and fossil component [98.36(d)(2)(ii)(I), 98.36(d)(2)(iii)(I)]
  • Report zero for this value if the facility elects to use the option specified in 98.3(c)(12) for the 2010 reporting year (where the facility chooses not to separately report biogenic emissions from part 75 units)
• The total annual CO₂ emissions at the monitored location, as calculated by the applicable part 75 methodology. Include both biogenic and non-biogenic CO₂ in this value. [98.36(d)(2)(ii)(F), 98.36(d)(2)(iii)(F)]
• If CO₂ calculation methodology used was CEMS, the following additional elements are required:
  • The total number of source operating hours in the reporting year that the CO₂ concentration parameter was missing (if an O2 monitor is used to calculate CO₂ concentration, report missing data for the O2 monitor here) [98.3(c)(8)]
  • The total number of source operating hours in the reporting year that the stack gas flow rate parameter was missing [98.3(c)(8)]
  • The total number of source operating hours in the reporting year that the moisture content parameter was missing (if a continuous monitor is in use) [98.3(c)(8)]
• If CO₂ calculation methodology used was the Appendix D and G calculation method, the following additional elements are required:
  • Total number of operating hours during the year that fuel flow rate data was missing [98.3(c)(8)]
  • Total number of operating hours during the year that high heating value data was missing [98.3(c)(8)]

For configurations of all types, subpart C requires you to identify the following for each configuration:

• The fuel types combusted during the reporting year [98.36(b)(4), 98.36(c)(1)(v), 98.36(c)(2)(iv), 98.36(c)(3)(iv), 98.36(d)(2)(ii)(A), and 98.36(d)(2)(iii)(A)]

If a configuration type is selected that uses Tiers 1, 2, or 3, you will be required to specify which equation is used to calculate CO₂ emissions. By identifying which equation is used to calculate emissions, e-GGRT is able to determine which data reporting elements are required for each fuel type.

For Configurations of Type 1 (single unit using Tiers 1, 2, or 3), Type 3 (aggregation of units), and Type 4 (common pipe), subpart C requires you to identify the methods used to calculate emissions for each fuel type. Include the following information for each fuel type combusted in the unit:

• Calculation methodology start date and end date, for each fuel type [98.36(b)(6)-(7), 98.36(c)(1)(viii)-(ix), 98.36(c)(3)(viii)-(ix)]
• Calculation methodology used for the emissions calculation period specified, for each fuel type [98.36(b)(5), 98.36(c)(1)(vii), 98.36(c)(3)(v)]:
  • Tier 1/Equation C-1: Annual fuel combusted, default heating value, and default CO₂ emission factor
  • Tier 1/Equation C-1a: Annual natural gas usage from billing records (therms) and default CO₂ emission factor
  • Tier 1/Equation C-1b: Annual natural gas usage from billing records (mmBtu) and default CO₂ emission factor
  • Tier 2/Equation C-2a: Annual fuel combusted, measured heating value, and default CO₂ emission factor
  • Tier 2/Equation C-2c: Steam generation, ratio of maximum rated heat input capacity to design rated steam output capacity, and default CO₂ emission factor (for MSW and solid fuels listed in Table C-1))
  • Tier 3/Equation C-3: Annual mass of solid fuel combusted and average carbon content of the solid fuel
  • Tier 3/Equation C-4: Annual mass of liquid fuel combusted and average carbon content of the liquid fuel
  • Tier 3/Equation C-5: Annual volume of gaseous fuel combusted, average carbon content of the gaseous fuel, and average molecular weight of the gaseous fuel

• The user should refer to 98.33(b) to determine which Tier is required for each fuel type at the configuration.

You should use the Validation Report to check your work. The Validation Report performs two types of checks:

• Data Completeness: Data that are required for reporting is missing or incomplete.
• Data Quality: Data are outside of the expected range of values.

You may view the Validation Report at any time.