(a) 
         If a CEMS is used to measure CO2 emissions, then in addition to the records required by  § 98.3(g), you must retain under this subpart the records required for the Tier 4 Calculation Methodology in  § 98.37.
     
    
        
        (b) 
         If a CEMS is not used to measure CO2 emissions, then in addition to the records required by  § 98.3(g), you must retain the records specified in this paragraph (b) for each portland cement manufacturing facility.
     
    
        
        (1) 
         Documentation of monthly calculated kiln-specific clinker CO2 emission factor.
     
    
        
        (2) 
         Documentation of quarterly calculated kiln-specific CKD CO2 emission factor.
     
    
        
        (3) 
         Measurements, records and calculations used to determine reported parameters.
     
    
        
            Code of Federal Regulations
        
        [75 FR 66461, Oct. 28, 2010]