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

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7080.1550 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 22 The local ordinance must not allow more than a 15 percent reduction in the vertical separation distance. A 15 percent reduction is only allowed to account for settling of sand or soil, normal variation of measurements, and interpretations of the limiting layer conditions. E. ISTS built before April 1, 1996, in areas that are not SWF areas as defined under part 7080.1100, subpart 84, must have at least two feet of vertical separation. F. The vertical separation measurement for items D and E must be measured outside the area of system influence in an area of similar soil. Subp. 5. Compliance criteria for systems with a flow of greater than 2,500 gallons per day. In addition to the requirements under subpart 4, systems designed under part 7080.2150, subpart 4, must demonstrate that the additional nutrient reduction component required under those items is in place and functioning. Subp. 6. Compliance criteria for systems receiving replacement components. Components of an existing system that result in the system being in noncompliance must be repaired or replaced according to part 7082.0100, subpart 1. The repaired or replacement components must meet technical standards and criteria for new construction according to local ordinance The remaining components of the existing system must result in the system being in compliance with subpart 4. Statutory Authority: MS s 115.03; 115.55 History: 32 SR 1347; 35 SR 1353 Published Electronically: October 10, 2013 7080.1550 ACCEPTABLE AND PROHIBITED DISCHARGES. Subpart 1. Sewage. This chapter provides design standards for ISTS that exclusively receive sewage. If ISTS receive both sewage and nonsewage, the requirements of this chapter and requirements governing the nonsewage portion of the waste apply. Subp. 2. System influent. A. Footing or roof drainage and chemically treated hot tub and pool water must not be discharged into any part of a system. Products containing hazardous chemicals and hazardous waste must not be discharged to a system other than in normal amounts of household products and cleaners designed for household use. Substances not intended for use in household cleaning, including but not limited to solvents, pesticides, flammables, photo finishing chemicals, paint, and dry-cleaning chemicals must not be discharged to the system. Other unused products or substances, or unused medicines, must not be discharged to the system solely as a method of disposal. Floor drains from garages serving dwellings must not be connected to the system. B. An ISTS must be designed to provide additional treatment if: (1) raw sewage exceeds 300 mg/1 BOD, 200 mg/1 TSS, or 50 mg/1 oil and grease; or (2) sewage tank effluent applied to the soil from the sewage tank or other secondary treatment device is greater than the concentrations in part 7080.2150, subpart 3, item K. Additional treatment must be designed by a Minnesota licensed professional engineer or according to the recommendations in the Prescriptive Designs and Design Guidance for Advanced Designers, which is incorporated by reference in item C, or must use a product registered under chapter 7083. Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.