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7081.0020 MIDSIZED SUBSURFACE SEWAGE TREATMENT SYSTEMS 2 This chapter does not regulate subsurface treatment systems that do not receive sewage as defined in this chapter. If systems regulated under this chapter receive both sewage and nonsewage, the requirements of this chapter apply, plus any additional requirements governing the nonsewage portion of the wastewater. Systems serving two or more dwellings, systems serving other establishments that serve over 20 persons, and systems receiving nonsewage are also regulated under Code of Federal Regulations, title 40, parts 144 and 146. This chapter does not contain design standards for sewage treatment systems that discharge to the ground surface or surface waters. Those systems require a national pollution discharge elimination systems permit. Primarily, this chapter provides measurable performance outcomes for MSTS, but this chapter also includes limited design, construction, inspection, and operational standards that are believed to reasonably protect surface water, groundwater, public health, safety, general welfare, and the environment. In conjunction with these standards, the agency encourages the use of advanced treatment methods and waste reduction to further reduce the discharge of contaminants. Other chapters that have a bearing on MSTS are standards for individual subsurface sewage treatment systems in chapter 7080, administrative requirements for subsurface sewage treatment systems local permit and inspection programs in chapter 7082 and certification and licensing requirements for those who design, install, inspect, maintain, or operate subsurface sewage treatment systems and product registration in chapter 7083. Statutory Authority: MS s 115.03; 115.55 History: 32 SR 1400 Published Electronically: March 11, 2011 7081.0020 DEFINITIONS. Subpart 1. Certain terms. In addition to the definitions in chapters 7080, 7082, and 7083 and Minnesota Statutes, section 115.55, which are incorporated by reference, the terms used in this chapter have the meanings given them. For the purposes of this chapter, if a term used in this chapter is defined in chapter 7080, 7082, or 7083, it shall apply to MSTS and other SSTS if referenced in later chapters. Certain terms or words used in this chapter must be interpreted as follows: the words "shall" and "must" are mandatory and the words "should" and "may" are permissive. All distances specified in this chapter are horizontal distances unless otherwise specified. Subp. 2. [Repealed, 38 SR 1001] Subp. 3. Groundwater mound. "Groundwater mound" means the rise in height of the periodically saturated soil or regional water table caused by the addition of sewage effluent from a subsurface sewage treatment system into the soil. Subp. 4. Midsized subsurface sewage treatment system or MSTS. "Midsized subsurface sewage treatment system" or "MSTS" means a subsurface sewage treatment system, or part thereof, as set forth in Minnesota Statutes, sections 115.03 and 115.55, that employs sewage tanks or other treatment devices with final discharge into the soil below the natural soil elevation or elevated final grade and that is designed to receive sewage design flow of greater than 5,000 gallons per day to 10,000 gallons per day. Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.