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Subp. 2. Location and construction of sewer lines. All sewer lines shall be constructed of materials approved by the commissioner of health, shall be adequately vented, and shall have water tight joints. Individual site sewer connections shall be at least a four-inch diameter sewer riser pipe. The sewer connections shall consist of one pipe line only without any branch fittings. All joints shall be water tight. All materials used for sewer connections shall be corrosive resistant, nonabsorbent, and durable. The inner surface shall be smooth. Provisions shall be made for capping the sewer riser pipe when a mobile home or recreational camping vehicle does not occupy the site. Surface drainage shall be directed away from the riser; the rim of the riser pipe shall extend at least 4 inches above ground elevation. Subp. 3. Compliance with pollution control agency standards. Systems of sewage disposal utilizing the discharge of effluents to bodies of surface water must receive the approval and comply with the water quality and effluent standards and system design criteria established by the Minnesota Pollution Control Agency. All systems utilizing soil absorption for final disposal of effluent shall comply with and receive the approval of the commissioner of health. No soil absorption system shall be installed in soil which has a percolation rate of less than one inch in 60 minutes, or where the groundwater table rises to within four feet of the bottom of a proposed absorption pit or trench, or where such system shall adversely affect the ground water used for potable water supplies. All buried portions of a sewage disposal system shall be located at least 50 feet horizontally from the ordinary high water level of any body of surface water. return to tOR 4630.0900 TOILET, BATHING, AND LAUNDRY FACILITIES. In dependent mobile home parks and recreational camping areas which harbor mobile homes and recreational camping vehicles which are not equipped with toilet and bathing facilities, one or more central buildings shall be provided equipped with such facilities. The number of fixtures shall be in accordance with the following schedule: Number of Toilets Urinals Showers Lavatories Dependent Sites Men Women Men Men Women Men Women 1-15 1 1 1 1 1 1 1 16-30 1 2 1 2 2 1 1 31-45 2 2 1 3 3 1 1 46-60 2 3 2 3 3 2 2 61-80 3 4 2 4 4 2 2 81-100 3 4 2 4 4 2 2 101-130 4 5 3 5 5 3 3 131-160 5 6 3 6 6 4 4 161-190 6 7 3 7 7 4 4 191-220 7 8 4 8 8 5 5 221-250 8 9 4 9 9 5 5 251-280 9 10 4 10 10 6 6 281-310 10 11 5 11 11 6 6 311-340 11 12 5 12 12 7 7 341-370 12 13 5 13 13 7 7