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k <br />on separate electrical circuits. <br />(4) Electrical wire from power <br />supply must not run over any tanks but must be laid beside the <br />tanks and placed in conduit along the electrical post. <br />(5) Electrical cords from the pump <br />and floats must be run through a 2 inch PVC conduit (Schedule 80). <br />Wires must not have ground contact. <br />(b) Pumping Chamber. <br />(1) Effluent pipe exiting the <br />pumoing chamber should be laid on a uniform slope up to the soil <br />^•eatment area for proper drainback. If the pipe at the tank must <br />-^e lower than union to get elevation for drainback, a 1/4 inch weep <br />hole must be used. <br />(2) When the soil depth above the <br />pressure distribution pipe is less than 3 1/2 feet, insulation must <br />be added to achieve an insulating factor equal to 3 1/2 feet of <br />soil to decrease the potential for freezing (styrofoam or <br />concentric piping are acceptable methods). Piping under hardcover <br />such as tennis courts or driveways shall receive an additional 1 <br />foot of soil cover or equivalent insulating factor. <br />(3) A reserve capacicy equaling 75% <br />of the anticipated daily flow must be allowed in the pumping <br />chamber between the alarm activation level and the pump tank inlet. <br />4. Drainfields. <br />(a) Trenches. Trenches must meet MPCA <br />Regulations Chapter 7080 and may not be located on slopes greater <br />than 18% without variance. <br />(b) Mounds. Mounds must meet MPCA <br />Regulations Chapter 7080 and may not be located on soils with <br />percolation rates slower than 120 mpi nor cn slopes greater than <br />6% without variance. <br />C. Conformity Standards. <br />1. New systems shall be located, designed and <br />constructed as code systems. <br />2. When an existing code system is repaired, <br />altered, or expanded, such system shall remain a code system. <br />Conforming systems, when repaired shall be upgraded to a code <br />system status whenever such classification in reasonably <br />attainable. <br />3. Existing non-conforming systems shall be <br />replaced by code systems whenever such classification is reasonably <br />attainable. If a code system Is not achievable due to soil, water <br />table, or lot limitations, the system may be replaced or repaired <br />such that it becomes a conforming system. <br />D. Construction Procedures. <br />1.Protect Absorption Area:Proposed