Emissions must be calculated using the relevant equations specified in the applicable subpart. To provide the inputs to the equations, you do not necessarily have to follow the monitoring requirements of the subpart. Instead, you can use available company data, considering the likely operating scenario for the reporting year that would lead to worst case GHG emissions. For example, for the input parameters needed for the equations, use the production goals from the company's business plan, company records, process knowledge, engineering judgment, and vendor data (e.g., vendor information could be used to estimate the carbon content of feedstocks, using the highest likely carbon content of those feedstocks.)