Section 307.7700  General Provisions

a)         Applicability

1)         Aluminum forming includes commonly recognized forming operations such as rolling, drawing, extruding, and forging, and related operations such as heat treatment, casting, and surface treatments.  Surface treatment of aluminum is any chemical or electrochemical treatment applied to the surface of the aluminum.  Such surface treatment is considered to be a part of aluminum forming whenever it is performed as an integral part of aluminum forming.  For this Subpart CP, surface treatment of aluminum is considered to be an integral part of aluminum forming whenever it is performed at the same plant site at which aluminum is formed and such operations are not considered for regulation under the electroplating and metal finishing provisions of Subparts N and AH.  Casting aluminum when performed as an integral part of aluminum forming and located on-site at an aluminum forming plant is considered an aluminum forming operation and is covered under this Subpart CP.  When aluminum forming is performed on the same site as primary aluminum reduction the casting must be regulated by Subpart CT (nonferrous metals) if there is no cooling of the aluminum before casting.  If the aluminum is cooled before casting, then the casting must be regulated by this Subpart CP.

2)         This Subpart CP applies to any aluminum forming facility, except for plants identified under subsection (a)(3), that introduces or may introduce pollutants into a POTW.

3)         This Subpart CP applies to indirect discharging aluminum forming plants that extrude less than three million pounds of product per year and draw, with emulsions or soaps, less than one million pounds per year.

b)         General Definitions.  The Board incorporates by reference 40 CFR 467.02 (2003).  This incorporation includes no later amendments or editions.

c)         Monitoring Requirements.  The Board incorporates by reference 40 CFR 467.03 (2003).  This incorporation includes no later amendments or editions.

d)         Compliance Dates.  The Board incorporates by reference 40 CFR 467.04 (2003).  This incorporation includes no later amendments or editions.

e)         Removal Credits.  The control authority may grant removal credits under Subpart C of 35 Ill. Adm. Code 310 for toxic metals limited in this Subpart CP when used as indicator pollutants.

(Source:  Amended at 47 Ill. Reg. 4662, effective March 23, 2023)