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3. Pumping Stations.In order to standardize installation and electrical connection <br /> methods,the following pumping station requirements must be met in addition to Minnesota Rules <br /> Chapter 7080: <br /> a. Electrical Connection. � <br /> (1) A water-tight,lockable electrical box must be mounted on a 4x4 <br /> inch treated redwood or cedar post. <br /> (2) All electrical connections shall be made within the box. Pump <br /> connection must not be made using a direct line(plug in only). Wire entry to the electrical box shall <br /> be sealed with a watertight material such as foam or putty. <br /> (3) Alarm and pump floats shall be on separate electrical circuits. <br /> (4) Electrical wire from power supply must not run over any tanks <br /> 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 through <br /> a 2 inch PVC (or equivalent) conduit(Schedule 80) with a one inch gap between the conduit and <br /> the electrical box. Electrical cords must not run through or under manhole cover. Wires must not <br /> have ground contact. <br /> b. Pumping Chamber. . <br /> (1) Effluent pipe exiting the pumping chamber should be laid on a <br /> 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 is less <br /> than 3 %2 feet, insulation must be added to achieve an insulating factor equal to 3 '/Z feet of soil to <br /> decrease the potential for freezing(styrofoam or concentric piping are acceptable methods). Piping <br /> under hardcover such as tennis courts or driveways shall receive an additional 1 foot of soil cover <br /> br equivalent insulating factor. <br /> (3) A reserve capacity equaling 75% of the anticipated daily flow <br /> must be allowed in the pumping chamber between the alarm activation level and the pump tank inlet. <br /> 4. Drainfields. <br /> a. Trenches. Trenches must meet M`innesota Rules Chapter 7080 and <br /> may not be located on slopes greater than 18%. <br /> Page 9 of 17 <br />