2019.02.04 CC Packet - Laserfiche WebLink

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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations required for systems whose absorption area receives treatment level C in part Minnesota Rules, 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 Department. (9) Soil Treatment Zone. For treatment of effluent by soil to meet the performance criteria in Section 4.8 (3) of this Chapter, the soil treatment and dispersal systems must meet the requirements below: (A) For soil treatment and dispersal systems that receive treatment level A-2, B-2, or C effluent as described in Minnesota Rules, 7083.4030, the soil treatment zone requirements must meet Section 16.3 (3). 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 Minnesota Rules, 7083.4030, the soil treatment zone requirements must meet or exceed the requirements of Section 16.3 (3), unless modified in Table VI in Section 16.3 (5), with a minimum vertical separation of two feet. The required vertical separation must be maintained during operation after accounting for groundwater mounding. (C) The minimum vertical separation can be determined by the method described in Section 21.1(3) to meet provisions of Section 4.8 (3). (D) An observation well to measure the height of the periodically saturated soil beneath the operating system must be installed and monitored according to the operating permit. (10) Nitrogen Reduction. MSTS systems must employ nitrogen mitigation methods to achieve compliance with Section 4.8 (4), and must be monitored in accordance with Section 11.4 of this Chapter. (11) Phosphorus Reduction. Phosphorus mitigation methods must be employed to achieve compliance with Section 4.8 (5), if natural processes are found inadequate. (12) Design Report. All information required in this Section shall be submitted for review and approval by the Department prior to system construction, including all applicable information delineated on a map. 16.6 Collection Systems. The collection system for the collection of sewage from multiple buildings or multiple other establishments discharging into an MSTS must be designed: (1) According to the Prescriptive Designs and Design Guidance for Advanced Designers, incorporated by reference under Section 5.2(4); or (2) By a Minnesota licensed professional engineer. 16.7 Construction Requirements. MSTS construction must be according to applicable construction requirements of this Chapter. 16.8 MSTS Design Standards. The design standards for new construction or replacement MSTS are provided to meet many of the public health and environmental outcomes in Section 4. In some cases, specific design methods must be employed in addition to the standards provided in this Chapter. 16.9 Prohibited Discharges. MSTS must not receive storm water or other sources of clean water. 16.10 Component Longevity. All structural components of the system and sealants must be designed to operate throughout the system's design life. 16.11 Flow Measurement Device. A flow measure device must be employed on all MSTS. 65 Washington County Development Code