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55 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 7080.2280 Subp. 7. Raising elevation. When it is necessary to raise the elevation of the soil treatment system to meet the vertical separation distance requirements, a mound system as specified in part 7080.2220 is allowed to be used with the following additional requirements: A. the elevation of the bottom of the mound bed absorption area must be at least one-half foot above the ten-year flood elevation if ten-year flood data are available; B. inspection pipes must not be installed unless the top of the mound is above the 100-year flood elevation; and C. the placement of clean sand and other fill must be done according to any community -adopted floodplain management ordinance Subp. 8. Inundation of top. When the top of a sewage tank is inundated, the dwelling must cease discharging sewage into it. Subp. 9. Backflow. Backflow prevention of liquid into the building when the system is inundated must be provided. If a holding tank is used, the system must be designed to permit rapid diversion of sewage into the holding tank when the system is inundated. Subp. 10. Holding tank. If a holding tank is used to serve a dwelling, the holding tank's liquid capacity must equal 100 gallons times the number of bedrooms times the number of days between the ten-year stage on the rising limb of the 100-year flood hydrograph and the ten-year stage on the falling limb of the hydrograph, or 1,000 gallons, whichever is greater. The holding tank must be accessible for removal of tank contents under flooded conditions. Subp. 11. Water level above top. Whenever the water level has risen above the top of a sewage tank, the tank must be pumped to remove all solids and liquids after the flood has receded and before use of the system is resumed. Statutory Authority: MS s 115.03; 115.55 History: 32 SR 1347 Published Electronically: October 10, 2013 7080.2280 PRIVIES. A. To qualify as a privy, the system must: (1) meet or exceed the requirements of part 7080.2150, subpart 2; (2) have soil beneath the bottom of the pit that meets or exceeds the requirements of part 7080.2150, subpart 3, item C, employ a watertight tank meeting applicable requirements of parts 7080.1900 to 7080.2030, or employ a toilet treatment device; and (3) meet the requirements of items B to E. B. Pits or vaults must have sufficient capacity for the dwelling they serve, but must have at least 25 cubic feet of capacity. C. The sides of the pit must be curbed to prevent cave-in. D. The privy must be easily maintained and insect proof. The door and seat must be self -closing. All exterior openings, including vent openings, shall be screened. E. Privies must be adequately vented. Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.