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49 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 7080.2220 Subp. 4. Design and construction of trenches and seepage beds. A. Trenches must be no more than 36 inches wide. Any excavation wider than 36 inches is a seepage bed. A seepage bed must not be wider than 12 feet if gravity distribution is used and 25 feet if pressure distribution is used. Natural, undisturbed soil must exist between multiple trenches and seepage beds. Multiple seepage beds must be spaced at one-half the bed width. B. A vertical inspection pipe at least four inches in diameter must be installed and secured in the distribution medium of every trench or seepage bed. The inspection pipe must be located at an end opposite from where the sewage tank effluent enters the medium. The inspection pipe must have three -eighths inch or larger perforations spaced vertically no more than six inches apart. At least two perforations must be located in the distribution medium. Perforations must not be located above the geotextile cover or wrap. The inspection pipe must extend to the bottom of the distribution medium, be secured, and be capped flush with or above finished grade. C. The top and bottom of the distribution medium must be level along the contour. Sidewalls must be as vertical as practical and not intentionally sloped. D. The minimum depth of soil cover, including topsoil borrow, over the distribution medium is 12 inches. E. Trenches or seepage beds must be backfilled and crowned above finished grade to allow for settling. The top six inches of the backfill must have the same texture as the adjacent soil. F. Trenches and seepage beds in which the distribution media is in contact with any of the United States Department of Agriculture soil textures classified as sand or loamy sand or soils with a percolation rate of 0.1 to 5 minutes per inch must employ one or more of the following measures: (1) employ pressure distribution according to part 7080.2050, subpart 4; (2) divide the total dispersal area into multiple units that employ serial distribution, with each dispersal unit having no greater than 15 percent of the required bottom absorption area; or (3) have a vertical separation distance of at least five feet. Statutory Authority: MS s 115.03; 115.55 History: 32 SR 1347; 35 SR 1353 Published Electronically: October 10, 2013 7080.2220 MOUNDS. Subpart 1. Mound system requirements. To qualify as a mound system, the system must meet or exceed the following requirements: A. employ flow values in parts 7080.1850 to 7080.1885; B. meet or exceed applicable technical requirements of parts 7080.1900 to 7080.2030, 7080.2050, and 7080.2100; C. meet or exceed the requirements of part 7080.2150, subparts 2 and 3; D. employ flow measurement; and E. meet the requirements of subparts 2 and 3. Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.