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

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7080.2150 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 44 * Setbacks from buried water lines and water supply wells are governed by chapters 4715 and 4725, respectively. ** Infringement on property line setbacks must be made through accepted local procedures. * * * Setbacks from lakes, rivers, and streams are governed by chapters 6105 and 6120. Subp. 3. Other technical requirements for systems. Items A to M are required for specific designs as determined in parts 7080.2200 to 7080.2400. A. Employ components registered under parts 7083.4070 and 7083.4080 that are installed, used, and operated according to the conditions placed on registration. B. Employ structural components and joint sealants that meet or exceed the system's expected design life. C. For acceptable treatment of septic tank effluent by soil, the soil treatment and dispersal systems must meet the requirements of subitems (1) and (2). (1) A minimum three-foot vertical soil treatment and dispersal zone must be designed below the distribution media that meets the criteria in units (a) to (c): (a) the zone must be above the periodically saturated soil and bedrock. The zone must be continuous and not be interrupted by seasonal zones of saturation; (b) any soil layers that are any of the United States Department of Agriculture (USDA) soil textures classified as sand with 35 to 50 percent rock fragments or loamy sand with 35 to 50 percent rock fragments must be credited at only one-half their thickness as part of the necessary treatment zone. Soil layers, regardless of soil texture, with greater than 50 percent rock fragments must not be credited as part of the necessary treatment zone. Layers that are given full, partial, or no credit must, in any layering arrangement in the soil profile, be cumulatively added to determine the amount of soil treatment zone in accordance with other soil treatment zone provisions; and (c) the entire treatment zone depth must be within seven feet from final grade. (2) The distribution system or media must not place a hydraulic head greater than 30 inches above the bottom of the bottom absorption area. D. The system's absorption area must be original soil. E. The system's absorption area and mound absorption ratio must be sized according to Table IX or IXa. TABLE IX LOADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA AND ABSORPTION RATIOS USING DETAILED SOIL DESCRIPTIONS * Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.