NR 468.30(4)(b)2.2. Certify that the industrial process cooling tower or towers are in compliance with sub. (3). NR 468.30(4)(b)4.4. Include the following statement: “I certify that no chromium-based water treatment chemicals have been introduced since [the initial compliance date] into any industrial process cooling tower located within the facility for any purpose.” NR 468.30(4)(c)(c) Prior notification under federal regulation. If the owner or operator of an industrial process cooling tower has submitted the notification required by par. (a) or (b) to the administrator under 40 CFR 63.405 prior to October 1, 1995, that notification shall be deemed to meet the applicable requirements of par. (a) or (b). NR 468.30(4)(d)(d) Records retained at facility. Each owner or operator of an industrial process cooling tower shall retain copies of the notifications required under pars. (a) and (b) at the facility for a minimum of 5 years. The notifications shall be made available to department staff on request during normal business hours. NR 468.30 HistoryHistory: Cr. Register, September, 1995, No. 477, eff. 10-1-95.