NR 110.24(5)(a)2.2. Vegetation and other unsuitable materials shall be removed from the area where the embankment is to be placed. NR 110.24(5)(b)1.1. Riprap or other means of preventing erosion shall be used at locations on lagoon bottoms and interior dike walls where erosion or activity of burrowing animals is likely to occur. NR 110.24(5)(b)2.2. Riprap or other erosion control methods shall be used on the exterior dike walls for lagoons which are constructed in a flood fringe. NR 110.24(5)(b)3.3. Exterior dike walls, berms and interior dike walls above the normal operating water depth, shall be riprapped or seeded with perennial, low growing, spreading grasses. NR 110.24(5)(c)(c) Fencing. Lagoons shall be enclosed within a fence. A vehicle access gate shall be provided. NR 110.24(5)(d)(d) Warning signs. Appropriate signs shall be provided along the fence surrounding lagoons to designate the nature of the facility and prohibit trespassing. NR 110.24(6)(a)(a) Air requirements. Air shall be provided to the aerated lagoons at a rate of not less than 1.5 kilograms oxygen per kilogram (1.5 pounds of oxygen per pound) of peak hour BOD removed. NR 110.24(6)(b)1.1. The department may approve the use of surface aeration equipment only in those cases in which the equipment can be properly maintained and operated during the winter. NR 110.24(6)(b)2.2. Surface aeration equipment shall be so designed and placed to provide optimum mixing of pond lagoon contents and dispersion of oxygen to the waste. Unless sufficient justification is presented to the contrary, surface aerators shall be designed using an oxygen transfer rate of 1.2 kilograms of oxygen per kilowatt-hour (2.0 pounds of oxygen per horsepower-hour) in clean water under standard conditions. NR 110.24(6)(c)1.1. Flexible tubing containing air release slits shall be provided across the lagoon bottom in accordance with the manufacturer’s recommendations. Air tubing shall be securely anchored to prevent floating. To prevent clogging of the air lines, provision shall be made to accommodate cleaning. NR 110.24(6)(c)2.2. Air tubing and anchors shall be constructed of materials which resist corrosion. NR 110.24(6)(c)3.3. Air shall be supplied to the lagoon system at a rate sufficient to meet the oxygen requirements of par. (a) assuming an oxygen transfer efficiency of 7% in clean water under standard conditions. NR 110.24(6)(c)4.4. Tubular aeration units shall be provided in sufficient number to supply adequate air to the pond system based on a maximum transfer rate of 0.6 kilograms (1.25 pounds) of oxygen per unit per hour in clean water under standard conditions. NR 110.24(6)(c)5.5. Where data is presented to the department to justify oxygen transfer rates varying from the requirements of this paragraph the department may approve such design transfer rates. NR 110.24(6)(d)1.1. Multiple blowers shall be provided. Capacity of the blowers shall be sufficient to meet total air demands with one blower out of service. NR 110.24(6)(d)2.2. Diffusers and air piping shall be capable of supplying 200% of the average daily air demand. NR 110.24(7)(a)(a) Materials. Influent lines, interconnecting piping, and overflow structures shall be constructed of materials suitable for underground gravity sewer construction. NR 110.24(7)(b)2.2. Overflow structures and interconnecting piping for continuous flow lagoon systems shall be sized in accordance with s. NR 110.13 (4). NR 110.24(7)(b)3.3. Overflow structures and interconnecting piping for controlled discharge lagoon systems shall be sized to handle the anticipated interlagoon flow rates during periods of discharge. NR 110.24(7)(c)1.1. A manhole shall be installed at the end of the influent line or force main and shall be located as close to the dike as topography permits. Its invert shall be at least 15 centimeters (6 inches) above the maximum operating water level of the lagoon to provide sufficient hydraulic head without surcharging the manhole.