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Sewage tanks shall be sized as other establishments per Minnesota Rules <br /> 10 or more <br /> chapter7080. <br /> c. Pumping stations. In order to standardize installation and electrical connection methods, <br /> the following pumping station requirements must be met in addition to Minnesota Rules <br /> chapter 7080: <br /> 1. Electrical connection. <br /> i. A watertight,lockable electrical box must be mounted on a four-inch-by-four-inch <br /> treated redwood or cedar post. <br /> ii. All electrical connections shall be made within the box. Pump connection must <br /> 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 /> iii. Alarm and pump floats shall be on separate electrical circuits. <br /> iv. Electrical wire from the power supply must not run over any tanks but must be <br /> laid beside the tanks and placed in conduit along the electrical post. <br /> v. Electrical cords from the pump and floats must be run through a two-inch PVC(or <br /> 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 the manhole <br /> cover. Wires must not have ground contact. <br /> 2. Pumping chamber. <br /> i. Pressure pipe exiting the pumping chamber must be laid on a uniform slope up <br /> to the soil treatment area for proper drain back. The pressure pipe must be <br /> sleeved inside a larger diameter pipe for additional support if spanning ground <br /> that has been excavated. If the pipe at the tank must be lower than union to get <br /> elevation for drain back, a one-quarter-inch weep hole must be used. <br /> ii. When the soil depth above the pressure distribution pipe is less than 3%z feet, <br /> insulation must be added to achieve an insulating factor equal to 3%feet of soil <br /> to decrease the potential for freezing (Styrofoam or concentric piping are <br /> acceptable methods). Piping under hardcover,such as tennis courts or driveways, <br /> shall be insulated pipe or equivalent. <br /> iii. A reserve capacity equaling 75 percent of the anticipated daily flow must be <br /> allowed in the pumping chamber between the alarm activation level and the <br /> pump tank inlet. <br /> d. Drainfields. <br /> 1. Trenches. Trenches must meet Minnesota Rules chapter 7080. <br /> 2. Mounds and at-grades. Mounds and at-grades must meet specifications per <br /> Minnesota Rules chapter 7080. <br /> (3) Compliance standards. <br /> a. A new system shall be located, designed and constructed as a code system. <br /> Page 3 <br />