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)NEMLWWL AUL SPECIFICATIONS for ' HYGI-AERATION SEWAGE TREATMENT PLANTS General The M. C. Nottingham Co. will furnish and install a complete extended sewage treatment plant at the location shown in the plans and in accordance with these specifications. The treatment plant shall be complete with all equipment necessary to treat domestic sewage.. The plant shall include a trash tank, aeration compartments and a final settling tank. The plant shall be designed to withstand normal pressures from the soil and the internal hydrostatic loads. The plant shall be installed on a concrete pad of adequate design or on approved compacted soil. Construction Each plant shall be composed of the proper number of aeration tanks of either 2500 gallon or 3500 gallon capacity with a settling compartment of the proper size. The tanks shall ^be of precast reinforced concrete sections with a minimum compressive strength of 3000 PSI. The sections shall be installed and sealed to form a water-tight plant. The aeration tanks shall be interconnected by a minimum of 6 - 6" cast iron pipes installed below the static water level. A minimum of 3 - 6" cast iron pipes shall connect the aeration tank with the settling compartment. All interconnecting pipes shall be sealed to make water-tight connections. The ,settling tanks shall have a steel baffle on the inlet end and adjustable outlet weir gn the outlet end. All aeration tank openings shall be covered with removable steel covers. The final tanks shall be covered with removable galvanized grating. The blower shall be installed on a concrete pad near the plant with all necessary electrical controls and the connecting air piping to the plant. Plant Design Data The aeration tank shall be of a capacity equal to the design daily flow. The organic loading shall not exceed 20 pounds B. 0. D. per 1000 cu. ft. of aeration compartment. The design flow shall be that required by the local authorities. The blower shall be