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

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27 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 7080.1730 swelling procedure is not required and the test is allowed to proceed if the initial filling of the hole with 12 inches of water seeps away in less than ten minutes; (6) in sandy soils, water depth must be adjusted to eight inches over the soil at the bottom of the test hole. From a fixed reference point, the drop in water level must be measured in inches to the nearest 1/16 inch at approximately ten-minute intervals. A measurement is also allowed to be made by determining the time it takes for the water level to drop one inch from an eight -inch reference point. If eight inches of water seeps away in less than ten minutes, a shorter interval between measurements must be used, but water depth must not exceed eight inches. The test must continue until three consecutive percolation rate measurements do not vary by more than ten percent. In other soils, the water depth must be adjusted to eight inches over the soil at the bottom of the test hole. From a fixed reference point, the drop in water level must be measured in inches to the nearest 1/16 inch at approximately 30-minute intervals and refilled between measurements to maintain an eight -inch starting head. If water seeps away in less than 30 minutes, a shorter time interval between measurements must be used, but water depth must not exceed eight inches. The test must continue until three consecutive percolation rate measurements do not vary by more than ten percent. The percolation rate is also allowed to be determined by observing the time it takes the water level to drop one inch from an eight -inch reference point if a constant water depth of at least eight inches has been maintained for at least four hours prior to the measurement; (7) the time interval must be divided in minutes by the drop in water level in inches to obtain the percolation rate in minutes per inch. The percolation rates that are within the ten percent provision determined for each test hole must be averaged to determine the final percolation rate for that hole. The slowest final percolation rate for all holes within the soil dispersal area must be used for design; and (8) a percolation test must not be run where frost exists within 12 inches of the bottom of the percolation test hole. Subp. 7. Site protection. The proposed soil treatment and dispersal area site shall be protected from disturbance, compaction, or other damage by staking, fencing, posting, or other effective method. Statutory Authority: MS s 115.03; 115.55 History: 32 SR 1347; 35 SR 1353 Published Electronically: October 10, 2013 7080.1730 PHASE l; SITE EVALUATION REPORTING. A written report on the site evaluation must be prepared and include the following: A. preliminary and field evaluation results from parts 7080.1710 and 7080.1720; B. dates of preliminary and field evaluations; C. a map drawn to scale or dimension with a north arrow, and including: (1) horizontal and vertical reference points of the proposed soil treatment and dispersal areas, soil observations, percolation tests, and pertinent distance from the proposed ISTS to all required setbacks, lot improvements, easements, ordinary high water mark of public waters, property lines, and direction and percent slope; (2) the location of any unsuitable, disturbed, or compacted areas; and (3) the access route for system maintenance; Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.