NR 811.40(1)(n) (n) Gases from feeders, storage, and equipment exhausts shall be conveyed to the exterior of the building above grade and remote from air intakes to reduce the health and safety risk to operators and reduce corrosion of equipment and facilities from chemical vapors. Chemical vapor ventilation systems shall meet the following requirements as applicable:

NR 811.40(1)(n)1. 1. Fluoride and ammonia liquid storage tanks shall be vented to the exterior of the building but not through vents in common with day tanks.

NR 811.40(1)(n)2. 2. Chemical tank vents, when provided, shall be vented to the exterior of the building and terminate downward facing with a 24-mesh corrosion resistant screen. The tank vent shall terminate as high as practical, but a minimum of 24 inches above surrounding grade.

NR 811.40(1)(o) (o) Permanent signs identifying the chemical for each fill tube shall be posted at chemical offloading areas. Permanent signs identifying the tank contents shall be posted adjacent to or on chemical storage tanks.

NR 811.40(1)(p) (p) Compliance with local, state, and federal safety codes, including department of safety and professional services and OSHA codes, for other applicable chemical safety and handling requirements is required.

NR 811.40(2) (2) Handling facilities. Handling facilities shall meet the following requirements:

NR 811.40(2)(a) (a) Equipment shall be provided for measuring quantities of chemicals used to prepare feed solutions.

NR 811.40(2)(b) (b) Piping for chemicals shall be compatible with the chemical being conveyed.

NR 811.40(2)(c) (c) The following equipment shall be provided for each installation where chemicals are handled:

NR 811.40(2)(c)1. 1. Where the eyes or body of any person may be exposed to injurious corrosive materials, suitable facilities for quick drenching or flushing of the eyes and body shall be provided as required in s. SPS 332.15.

NR 811.40(2)(c)2. 2. Rubber gloves, protective clothing, and safety goggles that form a tight seal with the face shall be provided for each operator who prepares chemical solutions.

NR 811.40(2)(c)3. 3. A dust respirator of the prescribed type shall be provided for handling dry chemicals if required in the respective material safety data sheet or s. SPS 332.15.

NR 811.40(2)(d) (d) Provision shall be made for the transfer of dry chemicals from shipping containers to storage bins or hoppers in such a way as to minimize the quantity of dust generated. Control shall be provided by use of one of the following:

NR 811.40(2)(d)1. 1. Vacuum pneumatic equipment or closed conveyor systems.

NR 811.40(2)(d)2. 2. Facilities for emptying shipping containers in special containers.

NR 811.40(2)(d)3. 3. Exhaust fans and dust filters which place the hoppers or bins under negative pressure.

NR 811.40(2)(e) (e) Carts, elevators, or other appropriate means shall be provided for lifting chemical containers to minimize lifting by operators.

NR 811.40(2)(f) (f) Electrical equipment shall be used which will prevent explosions, particularly when using sodium chlorite and activated carbon. Equipment shall comply with ch. SPS 316.

NR 811.40(2)(g) (g) Procedures for disposing of empty bags, drums, carboys, or barrels shall minimize exposure to dusts or chemicals.

NR 811.40(2)(h) (h) Acids shall be kept in closed, acid-resistant shipping containers, or storage units. Transfer from shipping containers to solution or day tanks shall be through acid resistant hose or pipe by means of a transfer pump.

NR 811.40(3) (3) Chemicals. All chemicals used to treat or produce potable water shall meet the following requirements:

NR 811.40(3)(a) (a) Shipping containers shall be fully labeled to include chemical name, purity, applicable NSF/ANSI standard approval in conformance with par. (b), concentration and supplier name and address.

NR 811.40(3)(b) (b) Chemicals shall meet the requirements of s. NR 810.09 (1).

NR 811.40 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; correction in (1) (p), (2) (c) 1., 3., (f) made under s. 13.92 (4) (b) 6., 7., Stats., Register December 2011 No. 672; CR 22-074: cr. (1) (cm), am. (1) (d), (g), (j), r. and recr. (1) (L), renum. (1) (n) to (1) (n) (intro.) and am., cr. (1) (n) 1., 2., Register January 2024 No. 817, eff. 2-1-24.

subch. VII of ch. NR 811 Subchapter VII — Treatment

NR 811.41 NR 811.41 General treatment design. The design of treatment processes and devices shall depend on evaluation of the nature and quality of the particular water to be treated and the desired quality of the finished water. Treatment shall be provided by each supplier of water if necessary in order to ensure that the finished water supplied to consumers meets the primary maximum contaminant levels contained in ch. NR 809 and is not objectionable to an appreciable number of consumers. The requirements of specific treatment processes are provided in ss. NR 811.42 to 811.60.

NR 811.41 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.

NR 811.42 NR 811.42 Treatment of water from surface water sources. Treatment of water from surface water sources shall meet the following requirements:

NR 811.42(1) (1) General requirements. All public water supply systems drawing water from lakes, rivers, streams, or other surface water sources shall, after the water is drawn, treat the water as provided in this chapter. In general and at a minimum, this treatment shall include coagulation, sedimentation, and filtration plus disinfection or membrane filtration plus disinfection. Filtration is required in all cases. Total plant removal and inactivation shall provide a minimum 99.9 percent (3-log) inactivation of Cryptosporidium and Giardia Lamblia plus 99.99 percent (4-log) inactivation of viruses.