Ordinances 1st series - 151 - 253

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/ 5 . To prevent the flooding of or flood damage to oper- ating systems. 6 . To prevent the premature extension of costly muni- cipal sewer and water services consistent with the adopted Comprehensive Land Use Plan of the city. SECTION 22 . 10 : DEFINITIONS Subdivision 1 : Rules . For the purposes of this code, the following words and terms shall have the meanings and interpretations set forth herein. The word "shall" is manda- tory and the words "should" and "may" are permissive. Subdivision 2 : Definitions. 1 . On-site Sewage Treatment System (hereinafter "sys- tem" or "on-site system" ) : A device or series of intercon- nected components designed , installed and maintained for the purpose of safely treating and disposing of sewage and domes- tic wastes , whenever such system is not part of a central sewer system. (a) Standard System: The standard system permitted by this code shall consist of a building drain and building sewer , two septic tanks, a distribution system, and a subsurface soil treatment and absorption area consisting of a series of gravity- fed drainfield trenches and an alternate area for future relo- cation of the drainfield. (b) Alternative Systems : Alternative systems permitted under controlled conditions by variance to this code include modified standard systems ; pressure-fed , shallow trench, seep- age bed , mound, aerobic , greywater ano osmosis systems ; toilet waste treatment devices ; and holding tanks. (c) Prohibited Systems : Systems hereby prohibited from being installed and/or used within the city include cesspools , seepage pits and privies. (d) Individual System: A system serving an individual building, typically a single family residence. (e ) Collector System: A system serving two or more buildings , typically including individual septic tanks con- nected to a cor;�mon soil treatment and absorption area. ( f) Commercial System: A system serving any non- residential building. -3-