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§ 98.77 Records that must be retained.
In addition to the records required by § 98.3(g), you must retain the following records specified in paragraphs (a) through (c) of this section for each ammonia manufacturing unit.
(a) If a CEMS is used to measure emissions, retain records of all feedstock purchases in addition to the requirements in § 98.37 for the Tier 4 Calculation Methodology.
(b) If a CEMS is not used to measure process CO2 emissions, you must also retain the records specified in paragraphs (b)(1) through (b)(2) of this section: