NR 110.22(4)(a)1.1. Eye-wash fountains and safety showers using potable water shall be provided in the laboratory and on each floor level or work location where hazardous chemicals are stored, mixed or slaked, pumped, metered or unloaded. These fountains and showers shall be less than 7.6 meters (25 feet) from points of exposure to hazardous chemicals and shall be fully usable during all weather conditions. NR 110.22(4)(a)2.2. Eye-wash fountains shall be supplied with water with a temperature not exceeding 38°C (100°F). This supply shall be separate from the hot water supply and be able to provide 15 to 30 minutes of continuous irrigation of the eyes. NR 110.22(4)(a)3.3. Safety showers shall be capable of discharging 1.9 to 3.2 liters per second (30 to 50 gallons per minute) of water with a temperature not exceeding 38°C (100°F) temperature, and at pressures of 1.41 to 3.52 kilograms force per square centimeter (20 to 50 pounds per square inch). NR 110.22(4)(a)4.4. The following protective clothing and equipment shall be available for use with all operations or procedures in which their use will minimize the risk of injury to personnel: NR 110.22(4)(a)4.a.a. Chemical worker’s goggles or other suitable goggles (safety glasses are insufficient); NR 110.22(4)(b)1.1. The materials used for storing of hazardous chemicals shall be selected based on the physical and chemical characteristics of each chemical used. NR 110.22(4)(b)2.2. Chemical storage areas shall be enclosed by dikes or curbs which will contain the stored volume in case of a spill until it can be either safely transferred to another storage area or released to the wastewater at a controlled rate which will not damage the treatment facilities, inhibit the treatment processes, or contribute to stream pollution. Liquid polymer shall be similarly contained. NR 110.22(4)(b)3.3. Chemical storage and mixing areas shall be separate from other treatment plant functions. NR 110.22(4)(c)1.1. The materials used for piping, valves, pumping, metering, splash guards and any other equipment used to convey hazardous chemicals shall be selected based on the physical and chemical characteristics of each chemical used. NR 110.22(4)(c)2.2. All piping containing or transporting hazardous chemicals shall be identified with labels every 3 meters (10 feet) and with at least 2 labels in each room, closet or pipe chase. Color coding may also be used but is not an adequate substitute for labeling. NR 110.22(4)(c)3.3. All pumps or feeders for hazardous or corrosive chemicals shall have splash guards which will effectively prevent spray of chemicals into space occupied by workers. The splash guards are in addition to guards to prevent injury from moving or rotating machinery parts. All connections except those adjacent to storage or feeder areas shall have guards which will direct any leakage away from space occupied by workers. NR 110.22(4)(c)4.4. Exposed pipes containing hazardous chemicals may not be located above shoulder level except where continuous drip collection trays and coupling guards will eliminate the spraying or dripping of these chemicals onto workers. NR 110.22(5)(a)(a) Design. Physical treatment shall be evaluated on a case-by-case basis. The design shall be based on pilot plant studies or operating experience. NR 110.22(5)(b)1.1. Selection of type, size, and depth of filter media shall depend on the filtration rate, the type of treatment provided prior to filtration, filter configuration, available hydraulic head, and the desired effluent quality. NR 110.22(5)(b)3.3. For high rate effluent filtration, the filtration rate at maximum hour design flow may not exceed 3.4 liters per second per square meter (5 gallons per minute per square foot). The filtration rate shall be calculated on the total available filter area with one filter unit out of service. NR 110.22(5)(b)4.4. Provisions shall be made for backwashing each filter. The backwash system shall be capable of providing a variable backwash rate with a maximum rate sufficient to fluidize the filtering material. A minimum backwash period of 10 minutes shall be provided.