NR 106.89(3)(3) Chloride limits in lieu of acute wet limits. Chloride limitations shall be included in the permit in lieu of acute whole effluent toxicity testing requirements and acute whole effluent toxicity limitations until source reduction actions are completed if any of the following apply: NR 106.89(3)(a)(a) The permittee can demonstrate to the satisfaction of the department that the effluent concentration of chloride exceeds 2,500 mg/L. NR 106.89(3)(b)(b) The permittee can demonstrate to the satisfaction of the department that the effluent concentration of chloride is less than 2,500 mg/L, but in excess of the calculated acute water quality-based effluent limitation, and additional data are submitted that demonstrate that chloride is the sole source of acute toxicity. NR 106.89(4)(4) Chloride limits in lieu of chronic wet limits. Chloride limitations shall be included in the permit in lieu of chronic whole effluent toxicity testing requirements and chronic whole effluent toxicity limitations until source reduction actions are completed if either of the following applies: NR 106.89(4)(a)(a) The permittee can demonstrate to the satisfaction of the department that the effluent concentration of chloride exceeds 2 times the calculated chronic water quality-based effluent limitation. NR 106.89(4)(b)(b) The permittee can demonstrate to the satisfaction of the department that the effluent concentration of chloride is less than 2 times the calculated chronic water quality-based effluent limitation, but in excess of the calculated chronic water quality-based effluent limitation, and additional data are submitted which demonstrate that chloride is the sole source of chronic toxicity. NR 106.89(5)(5) Decision documentation. The department shall specify the decision to include chloride limitations instead of whole effluent toxicity limitations in the permit fact sheet. NR 106.89(6)(6) Reevaluation. The department shall reevaluate the need for whole effluent toxicity and chloride monitoring or limitations upon permit reissuance. NR 106.89 HistoryHistory: Cr. Register, January, 2000, No. 529, eff. 2-1-00; CR 15-085: r. and recr. Register August 2016 No. 728, eff. 9-1-16; correction in (2) (c) made under s. 35.17, Stats., Register August 2016 No. 728. NR 106.90(1)(1) Introduction. A 3-tiered system of source reduction measures is established in ascending order of increasing capital and operating costs. NR 106.90(2)(2) Tier 1 source reduction measures are those voluntary source reduction activities that identify and quantify chloride and softened water sources and usage, educate users and system operators on the need to minimize salt and softened water demands and promote better housekeeping practices that will reduce chloride and softened water consumption, and other activities similar in nature. Tier 1 source reduction measures may include any of the following: NR 106.90(2)(a)2.2. Educate homeowners on the impact of chloride from residential softeners, discuss options available for increasing softener salt efficiency, and request voluntary reductions. NR 106.90(2)(a)4.4. Request voluntary support from local water softening businesses in the efforts described in subds. 2. and 3. NR 106.90(2)(a)5.5. Educate licensed installers and self-installers of softeners on providing optional hard water for outside faucets for residences. NR 106.90(2)(a)6.6. Request voluntary reductions in chloride input from industrial and commercial contributors. NR 106.90(2)(a)7.7. Where a public water utility has been identified as a significant contributor of chloride to the sewer system, request that the water utility conduct activities listed in par. (b). NR 106.90(2)(b)(b) For direct-discharging municipal or commercial water softening plants: NR 106.90(2)(b)1.1. Identify the users of soft water or the processes using soft water, and the amounts they use. NR 106.90(2)(b)2.2. Determine which users or processes can tolerate unsoftened water, and determine their impact on demand. NR 106.90(2)(b)3.3. Determine which users can close-loop their once-through cooling system or which processes can be close-looped, and determine their impact on demand. NR 106.90(2)(c)(c) For dairies, train plant personnel to be more aware of salt conservation, emphasizing simple, cost effective housekeeping measures. For example, spilled salt can be cleaned up as a solid waste rather than flushed down the floor drain. NR 106.90(2)(d)2.2. Optimize softener operation to ensure the appropriate regeneration interval and salt dosage are used.