For the purpose of this subpart:
(a) Except as provided below, the general definitions, abbreviations and methods of analysis set forth in part 401 of this chapter shall apply to this subpart.
(b) The term ``product'' shall mean carbon black manufactured by the furnace process.
(c) The term ``process waste water'' shall mean waters which result from baghouse operations or thermal quench operations. Sec. 458.12 [Reserved]