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2. Sewage Tanks. The minimum sewage tank size requirements are as follows; <br />No of Bedrooms <br />4 or less <br />5 or 6 <br />7, 8 or 9 <br />10 or more <br />Tanks Liquid Capacities (Gall <br />1000+1000 Regardless of garbage disposal use <br />1250+1000 Regardless of garbage disposal use <br />1500+1500 Regardless of garbage disposal use <br />Sewagejanks shall be sized as ’’other ” establishments <br />per MPCA Regula tions Minnesota Rules Chapter 7080. <br />3. Pumping Stations. In order to standardize installation and electrical connection <br />methods, the following pumping station requirements must be met in addition to MPCA Regulations <br />Minnesota Rules Chapter 7080: <br />(a) Electrical Connection. <br />(1) A water-tight, lockable electrical box must be mounted on <br />a 4x4 inch treated redwood or cedar post. <br />(2) All electrical connections shall be made within the box. <br />Pump connection must not be made using a direct line (plug in only). Wire entry to the electrical box <br />shall be sealed with p u tty a watertight material such as foam or putty. <br />(3) Alarm and pump floats shall be on separate electrical <br />circuits. <br />(4) Electrical wire from power supply must not run over any <br />tanks but must be laid beside the tanks and placed in conduit along the electrical post. <br />(5) Electrical cords from the pump and floats must be run <br />through a 2 inch PVC (or equivalent) conduit (Schedule 80) with a one inch gap between the <br />conduit and the electrical box. Electrical cords must not run throutzh or under manhole cover . Wires <br />must not have ground contact. <br />(b) Pumping Chamber. <br />(1) Effluent pipe exiting the pumping chamber should be laid <br />on a uniform slope up to the soil treatment area for proper drainback. If the pipe at the tank must be <br />lower than union to get elevation for drainback, a 1/4 inch weep hole must be used. <br />(2) When the soil depth above the pressure distribution pipe <br />is less than 3 'A feet 42 inches , insulation must be added to achieve an insulating factor equal to 3 <br />feet 42 inches of soil to decrease the potential for freezing (styrofoam or concentric piping are <br />acceptable methods). Piping under hardcover such as tennis courts or driveways shall receive an <br />additional 1 fo ot 12 inches of soil cover or equivalent insulating factor. <br />(3) A reserve capacity equaling 75% of the anticipated daily <br />flow must be allowed in the pumping chamber between the alarm activation level and the pump tank <br />Page 13 of 22