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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations 3.6 MSTS qualifications. All MSTS must be designed and operated according to this Chapter. All MSTS must be designed, installed, inspected, pumped and operated by a qualified employee in accordance with the requirements in Minnesota Rules Chapter 7083, or a licensed businesses meeting the qualifications of Minnesota Rules, Chapter 7083. All MSTS must conform to applicable state statutes and rules. 3.7 Collection Systems. Collection of greater than 2,500 gallons per day of sewage from multiple buildings or multiple other establishments discharging into an SSTS must be: (1) Designed according to Prescriptive Designs and Design Guidance for Advanced Designers, incorporated by reference under Section 5.2(4); or (2) Designed by a Minnesota licensed professional engineer. 3.8 MSTS septage All septage generated from MSTS must be treated and dispersed to applicable standards for septage as set forth in Code of Federal Regulations, title 40, part 503, and any local requirements. 3.9 SDS permit required. (1) The owner or owners of a single SSTS, or a group of SSTS under common ownership must obtain either an National Pollutant Discharge Elimination System (NPDES) or an State Disposal Permit (SDS) permit from the MPCA and comply with all NPDES or SDS requirements according to Minnesota Rules, Chapter 7001 when all or part of the proposed or existing soil dispersal components are within one-half mile of each other and the combined flow from all proposed and existing SSTS is greater than 10,000 gallons per day. For proposed SSTS, the now must be determined according to Section.3.9(3). For existing SSTS, the flow is determined by the greater of: (A) The average maximum seven-day measured flow; or (B) The flow determined according to Section 3.9(3). (2) An SDS permit is required for any subsurface sewage treatment system or group of subsurface sewage treatment systems that the commissioner determines has the potential or an increased potential to cause adverse public health or environmental impacts if not regulated under a state permit. Conditions for these permits include systems in environmentally sensitive areas, unsubstantiated or unexpected flow volumes, and systems requiring exceptional operation, monitoring, and management. (3) Flow amounts to calculate whether an SDS permit is required must be determined according to Section 12.4 to 12.10. The highest calculated value of the various methods in Table II of Section 12 must be used to make this determination. An SDS permit is not required, for an SSTS not otherwise requiring an SDS, if a factor of safety is added to the design flow that results in a design flow that is in excess of the SDS permit threshold. 3.10 Other state regulations. MSTS must conform to all applicable state statutes and rules. MSTS serving establishments licensed or regulated by the State of Minnesota, or MSTS owned by the State of Minnesota, must conform to this Chapter. 3.11 Local regulations. Any SSTS requiring approval from the State of Minnesota must also meet all requirements set forth in this Chapter, and in all other local codes and ordinances. 3.12 Work done without permit. Where work requiring a permit under this Chapter has commenced without first having obtained such permit, work shall be ordered to stop by the Department until all required permits have been approved and issued. 21 Washington County Development Code