(a) The provisions of this subpart apply to all new and existing industrial process cooling towers that are operated with chromium-based water treatment chemicals and are either major sources or are integral parts of facilities that are major sources as defined in § 63.401.

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(b) Table 1 of this subpart specifies the provisions of subpart A that apply and those that do not apply to owners and operators of IPCT‘s subject to this subpart.

[59 FR 46350, Sept. 8, 1994, as amended at 71 FR 17738, Apr. 7, 2006]