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I I I I I I I I I I I I I I I I I I I SUBDIVISION 2. LOCATION. 1. On slopes in excess of twelve per cent (12%), the soil profile shallbe carefully evaluated in the location of the proposed soil treatment area and downslope to identify the presence of layers with different permeabilities that may cause sidehill seepage. In no case shall a trench be located within fifteen (15) feet of where such a layer surfaces on the downslope. 2. Bed construction shall be limited to areas having natural slopes of less than six per cent (6%). 3. Any soil treatment area shall be set back the following distances from the features given below. Feature Setback Distance in Feet Water supply well less than 50 feet deep and not encountering at least 10 feet of impervious material. Any other water supply well or buried water suction pipe Buried pipe distributing water under pressure Building Property lines 100* 50 10 20 10 * Required for new developments and, where applicable, for existing developments. Any soil treatment area shall be set back the following distances if located in an area which has been designated as follows by any local, state or federal regulation. 4. Regulations Setback Distance in Feet Recreational development lakes General development lakes and streams Wild river Scenic river Critical river Designated tributaries of wild, scenic and recreational rivers 75* 50* 150* 100* 100* 75* * Required for new developments and, where applicable, for existing developments. Soil treatment areas shall not be placed in flood plains delineated by local ordinances adopted in compliance with the Statewide Standards and Criteria for Management of Flood Plain Areas of Minnesota (Chapter 6120), or in areas for which regional flood information is available from the Department of Resources except that in areas where ten year flood information is available from and/or approved by the DNR, soil treatment systems may be installed in accordance with the provisions of Chapter 7080.0210. 5. 6. Soil treatment areas of individual sewage treatment systems that are designed to treat an estimated daily sewage flow greater than 3,000 gallons per day must be separated from other similarly sized systems by at least 300 feet. 51