Agenda - Council - 05/13/2014 - Laserfiche WebLink

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7081.0270 MIDSIZED SUBSURFACE SEWAGE TREATMENT SYSTEMS 20 (2) have a soil loading rate of greater than zero as listed in Table IX or IXa, in part 7080.2150, subpart 3, item E; and (3) be above the periodically saturated soil or bedrock; B. meet the area size requirements in subpart 5 and setbacks in subpart 2 and all easements; C. not be a wetland or floodway; D. not be in an area in which surface runoff from precipitation will concentrate (concave hillslope); and E. allow the system to be placed on contour. Subp. 4. Inspection pipes. Inspection pipes must be located to adequately assess the hydraulic performance of the entire soil dispersal system. Subp. 5. Soil absorption area sizing. A. Effluent loading rates to the soil must be determined in: (1) part 7080.2150, subpart 3, item E, Table IX or IXa; or (2) part 7080.2400, if allowed by the local unit of government. B. If the absorption area receives septic tank or treatment level C effluent as described in part 7083.4030, the absorption area shall be increased by 50 percent of the amount derived in item A, subitem (1), and zoned for dosing and resting. Subp. 6. System geometry, lawn area sizing, and groundwater mounding. The system geometry and lawn area sizing shall be sized to prevent groundwater mounding from violating the unsaturated zone beneath the soil system according to subpart 7, for proper hydraulic functioning, and for concentration reduction of nitrogen and phosphorus, if applicable. Subp. 7. Reserve land area. Additional set -aside land area of 100 percent of the size determined in subpart 6 is required for systems whose absorption area receives effluent meeting treatment level A or B in part 7083.4030 or designed in accordance with part 7080.2400. Additional land area of 50 percent of the size determined in subpart 6 is required for systems whose absorption area receives treatment level C in part 7083.4030. The reserve land area must be identified and protected for future use if necessary. Replacement MSTS proposed on sites that cannot meet this requirement are allowed to be exempted by the local unit of government. Subp. 8. Soil treatment zone. For treatment of effluent by soil to meet the performance criteria in part 7081.0080, subpart 4, item C, the soil treatment and dispersal systems must meet the requirements of item A, B, or C. A. For soil treatment and dispersal systems that receive treatment level A-2, B-2, or C effluent as described in part 7083.4030, the soil treatment zone requirements must meet part 7080.2150, subpart 3, item C. The required three-foot vertical separation must be maintained during operation after accounting for groundwater mounding. B. For soil treatment and dispersal systems that receive treatment level A or B effluent as described in part 7083.4030, the soil treatment zone requirements must meet part 7080.2150, subpart 3, item C, unless it is modified in Table XI of part 7080.2350, subpart 2, with a minimum vertical separation of two feet. The required vertical separation must be maintained during operation after accounting for groundwater mounding. Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.