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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations SECTION 2. DEFINITIONS 2.1 Certain Terms. For the purposes of this Chapter, certain terms or words used are interpreted as follows: the words "shall" and "must" are mandatory and the words "should" and "may" are permissive. 2.2 Definitions. For the purpose of this Chapter, the certain words and phrases are defined as follows: (1) Absorption area. "Absorption area" means the design parameter that is associated with the hydraulic acceptance of effluent. The absorption area for mound systems is the original soil below a mound system that is designed to absorb sewage tank effluent. The absorption area for trenches, seepage beds, and at -grade systems is the soil area in contact with the part of the distribution medium that is designed and loaded to allow absorption of sewage tank effluent. This includes both bottom and sidewall soil contact areas. (2) Agency. "Agency" means the Minnesota Pollution Control Agency (MPCA). (3) Alarm device. "Alarm device" means a device that alerts a system operator or system owner of a component's status using a visual or audible device. An alarm device can be either on site or remotely located. (4) Applicable requirements. "Applicable requirements" means: (A) This Chapter; Minnesota Rules, Chapter 7082; and, Minnesota Statutes, section It 5.55; or (B) In areas of the County without complying ordinances to regulate SSTS, the requirements in this Chapter. (5) As-builts. "As-builts" means drawings and documentation specifying the final in -place location, size, and type of all system components. These records identify the results of materials testing and describe the conditions during construction. An as -built also contains a certified statement. (6) ASTM. "ASTM' means the American Society for Testing and Materials. (7) At -grade system. "At -grade system" means a pressurized soil treatment and dispersal system where sewage tank effluent is dosed to an absorption bed that is constructed directly on original soil at the ground surface and covered by loamy soil materials. (8) Baffle. "Baffle" means a device installed in a septic tank to retain solids and includes, but is not limited to, vented sanitary tees with submerged pipes and effluent screens. (9) Bedrock. "Bedrock" means geologic layers, of which greater than 50 percent by volume consists of unweathered in -place consolidated rock or rock fragments. Bedrock also means weathered in - place rock which cannot be hand augered or penetrated with a knife blade in a soil pit. (10) Bedroom. "Bedroom" means, for the sole purpose of estimating design flows from dwellings, an area that is: (A) a room designed or used for sleeping; or (B) a room or area of a dwelling that has a minimum floor area of 70 square feet with access gained from the living area or living area hallway. Architectural features that affect the use as a bedroom under this item may be considered in making the bedroom determination. (11) Biochemical oxygen demand or BOD. `Biochemical oxygen demand" or `BOD" means the measure of the amount of oxygen required by bacteria while stabilizing, digesting, or treating biodegradable organic matter under aerobic conditions over a five-day incubation period, commonly expressed in milligrams per liter (mg/L). (12) Building. "Building" means any structure used or intended for supporting or sheltering any use or occupancy. (13) Building sewer. "Building sewer" means the part of the drainage system which extends from the end of the building drain and conveys its discharge to a subsurface sewage treatment system. (14) Capillary fringe. "Capillary fringe" means the soil layer directly above a saturated layer in which the pore spaces are nearly filled with water as water is drawn upward due to adhesive and cohesive forces. 10 Washington County Development Code