Step 1: Add a CEMS Monitoring Location (CML)

To add a CEMS Monitoring Location (CML), click the “Add a CEMS Monitoring Location” link below the CEMS MONITORING LOCATION SUMMARY table on the Subpart Overview page

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Step 2: Define a CML and report emissions information

For each CEMS Monitoring Location, provide the following information:

• A unique unit name or identifier for the CML (see also About Unique Unit Names)
• An optional description or label for the CML
• The configuration of processes or process units that are monitored by the CML:
  • Single process or process unit that exhausts to a dedicated stack
  • Multiple processes or process units that share a common stack
  • Process or process unit that shares a common stack with one or more stationary fuel combustion units
• The Tier 4/CEMS methodology start and end dates
• The cumulative total of hourly CO₂ mass emissions for each quarter of the reporting year (metric tons) (Do not cumulate emissions data between quarters)
• The total annual CO₂ mass emissions measured by the CEMS (metric tons)
• The total annual biogenic CO₂ emissions from the combustion of all biomass fuels combined (metric tons) (if not applicable, enter '0')
• The total annual non-biogenic CO₂ emissions which includes fossil fuel, sorbent, and process CO₂ emissions (metric tons)
  CML, please enter '0'_)

Step 3: Add Fuels to Calculate CH₄ and N₂O Emissions

To calculate CH₄ and N₂O emissions, click on ADD A FUEL.

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On the following screen, select the fuel combusted in this unit, stack, or pipe, and click SAVE.

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Select the Facility Overview screen, click the new fuel in the list, and decide whether you will use Equation C-10 to calculate CH₄ and N₂O emissions or enter your own results. If you elect to enter your own data, select the radio button and enter the required data, then click NEXT.

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On the Equation Inputs screen, enter the required data. When finished, select SAVE to return to the previous page where CH₄ and N₂O emissions will be automatically calculated. Click FINISHED to save your fuel data.

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Repeat for each fuel feeding the CEMS monitoring location.

Step 4: Enter Additional Emissions Information

For each CEMS Monitoring Location, provide the following additional information:

• The total number of source operating hours in the reporting year
• The total operating hours in which a substitute data value was used in the emissions calculations for the CO₂ concentration parameter
• The total operating hours in which a substitute data value was used in the emissions calculations for the stack gas flow rate parameter
• If moisture correction is required and a continuous moisture monitor is used, the total operating hours in which a substitute data value was used in the emissions calculations for the stack gas moisture content parameter
• An indication of the process units monitored by the CML

Do not leave any of these fields blank. If, for example, your facility has no biogenic CO₂ emissions, enter '0'.

Step 5: Identify process units monitored at a CML

To identify the process units monitored at a CML, first click the link titled “ADD/REMOVE a process unit that exhausts to this CEMS Monitoring Location” at the bottom of the page

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On the CML Process Units Selection page, use the check boxes to select the process unit(s) monitored at this CML. This will indicate that the unit(s) selected vent emission through the stack monitored by this CML.

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If you are reporting under Subpart Y, you are also required to enter the CO₂ emissions from this CEMS Monitoring Location that are attributable to process CO₂ emissions from this process unit (metric tons).

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When finished selecting process unit for the CML and entering additional required information (if applicable), click SAVE. You should then be directed back to the Add/Edit a CML Location form and see the units you selected listed in the CEMS MONITORING LOCATION PROCESS UNITS table.

Step 6: Save entered data for a CML

When you have finished entering data for a CML, click SAVE. You will then return to the Subpart Overview page. You will see the status of data entry for the CML updated to “Complete” in the Status column in the CEMS MONITORING LOCATION SUMMARY table.

If you don't have all the data, you can enter some now, save it, and finish later by clicking on the hyperlinked name of the CML in the CEMS MONITORING LOCATION SUMMARY table.

After you save the data on this page, the next time you open the page, the calculator on the top of the page will display the CO₂ process emissions for the CML, rounded to the nearest metric ton: the value displayed is for informational purposes only

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Step 7: Repeat Steps 1-4

Repeat Steps 1-4 until emissions information has been entered for all CEMS Monitoring Locations. If you have missed something, the validation report messages will help you identify any incomplete entries.