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4. Sewage tanks shall be set back the following distances <br />if located in an area of the city which has been designated <br />as follows by local, state or federal regulation. <br />Regulation Minimum Setback Distances (feet) <br />Natural Environment <br />Lakes and Rivers 150* <br />Recreational Development <br />Lakes and Rivers 75* <br />General Development <br />Lakes and Rivers <br />Wild Rivers <br />Critical Rivers <br />Designated Tributatries <br />of Wild Scenic and <br />Recreational Rivers <br />*Required for new development(s) and where practicable for <br />existing developments. <br />5. Surface Flooding. Sewage tanks shall not be placed in <br />flood plains, delineated by local ordinances adopted in <br />compliance with the Statewide Standards for Management of <br />Flood Plain Areas of Minnesota (Minn. Reg. NR 85 -93), or in <br />areas for which regional flood information is available from <br />the Department of Natural Resources. <br />DISTRIBUTION OF EFFLUENT <br />Gravity Distribution <br />(a) Level Ground <br />Where the elevation differences of the ground surface does not <br />exceed twenty -eight (28) inches in any direction within the soil <br />treatment area, the sewage tank may be directed to the soil <br />treatment area through a system of interconnected distribution <br />pipes or trenched in a continuous system. <br />(b) Slightly Sloping Ground <br />50* <br />150* <br />100* <br />75* <br />t,P, r_hP elevation elifference of the ground surface exceeds <br />twenty -eight (28) inches in any direction' within the soil <br />treatment area, the sewage tank effluent may be distributed by a <br />distribution box, provided the final ground surface elevation of <br />the lowest trench is at least one (1) foot higher than the outlet <br />inverts of the distribution box. <br />