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

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25 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 7080.1720 D. underground utilities must be located before soil observations are undertaken; E. required safety precautions must be taken before entering soil pits; F. soil observations must be conducted prior to any required percolation tests to determine whether the soils are suitable to warrant percolation tests and, if suitable, at what depth percolation tests shall be conducted; and G. the minimum depth of the soil observations must be to the periodically saturated layer, to the bedrock, or three feet below the proposed depth of the system, whichever is less. Subp. 5. Soil descriptions for determination of limiting layer. Each soil profile observed at the proposed soil treatment area must be evaluated under adequate light conditions with the soil in a moist unfrozen state for the characteristics in items A to H: A. the depth of each soil horizon measured from the ground surface. Soil horizons are differentiated by changes in texture, color, redoximorphic features, bedrock, structure, consistence, and any other characteristic that affects water movement or treatment of effluent; B. a description of all soil colors for each horizon according to the Munsell Soil Color Charts, Revised Edition, Munsell Color Corporation (1992), or equivalent. The color charts are incorporated by reference, are available through the Minitex interlibrary loan system, and are not subject to frequent change; C. a description of the soil texture, structure, and consistence using the United States Department of Agriculture (USDA) soil classification system as specified in the Field Book for Describing and Sampling Soils, which is incorporated by reference under part 7080.1100, subpart 36; D. depth to the bedrock; E. depth to the periodically saturated soil for new construction or replacement as determined by redoximorphic features and other indicators, as determined in subitems (1) to (3): (1) in subsoil and parent material, redoximorphic features include: (a) distinct redoximorphic iron accumulations or distinct redoximorphic iron depletions; (b) a gleyed or depleted soil matrix or redoximorphic mottles having a color chroma of two or less or a depleted matrix or redoximorphic mottles having a color hue of 5Y and a chroma of three or less; or (c) faint redoximorphic concentrations or faint redoximorphic depletions in subsoil or parent material with a hue of 7.5YR or redder; (2) in lower topsoil layers that are deeper than 12 inches from the surface and are immediately followed in depth by a periodically saturated horizon, redoximorphic features include: (a) soil colors with a redoximorphic chroma of two or less; or (b) redoximorphic accumulations or depletions; (3) in the upper 12 inches of the topsoil layer, if it is immediately followed by a periodically saturated horizon, the depth of seasonal saturation is determined by one or more of the indicators in units (a) to (f): (a) soil colors with a chroma of zero; (b) organic soil textures or mineral soil textures with an organic modifier; Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.