; and (2) the exchange value of each regulated substance, as set forth in table 1 of this section or, for additional regulated substances listed pursuant to subsection (c), as determined by the Administrator pursuant to the requirements of that subsection. (c) Additional regulated substances The Administrator may, by regulation, add a substance to the list published under subsection (a) if such substance— (1) is a saturated hydrofluorocarbon; and (2) has an exchange value, as determined by the Administrator on the basis of widely used or commonly accepted credible current scientific information relating to infrared absorption and kinetic rate constants, of not less than 53. (d) Savings provision Nothing in this section authorizes the Administrator to add to the list under subsection (a) as a regulated substance a blend of substances even if such blend includes a saturated hydrofluorocarbon that is or may be itself a regulated substance. 4. Monitoring and reporting requirements (a) Reports (1) In general On a periodic basis to be determined by the Administrator, but which shall be not less than annually, each person who produced, imported, exported, reclaimed, destroyed, used and entirely consumed (except for trace quantities) in the manufacture of other chemicals, or used as a process agent a regulated substance shall submit a report to the Administrator setting forth the amount of each such substance that such person during the preceding reporting period— (A) produced; (B) imported; (C) exported; (D) reclaimed; (E) destroyed; (F) used and entirely consumed (except for trace quantities) in the manufacture of other chemicals