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7080.2150 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 46 <br />Silt loam, silt <br />Silt loam, silt <br />Clay loam, sandy <br />clay loam, silty <br />clay loam <br />Clay, sandy clay, <br />silty clay <br />Granular, blocky, <br />or prismatic <br />structure; weak <br />to strong grade <br />Platy with weak 0.42 <br />grade or massive <br />Granular, blocky, 0.45 <br />or prismatic <br />structure; moderate <br />to strong grade <br />** <br />0.5 2.4 0.78 <br />2.9 0.65 <br />2.6 0.6 <br />2.1 <br />2.5 <br />2.7 <br />** <br />* Proposed absorption areas must meet item L and must have very friable and friable consistence or loose <br />noncemented sands. <br />** Conduct percolation test and size under Table IXa. May need to be designed under part 7080.2300. <br />* * * Assume a hydraulic loading rate to the sand at 1.6 gpd/ft2. <br />TABLE IXa <br />LOADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA AND <br />ABSORPTION RATIOS USING PERCOLATION TESTS <br />Percolation rate <br />(MPI) <br /><0.1 <br />0.1 to 5 <br />0.1 to 5 (fine <br />sand and loamy <br />fine sand) <br />6 to 15 <br />16 to 30 <br />31 to 45 <br />46 to 60 <br />Treatment level <br />C absorption <br />area loading rate <br />(gpd/ft2) <br />1.2 <br />0.6 <br />0.78 <br />0.6 <br />0.5 <br />0.45 <br />Treatment level C <br />mound absorption <br />ratio <br />1.0 <br />1.0 <br />2.0 <br />1.5 <br />2.0 <br />2.4 <br />2.6 <br />Treatment levels <br />A, A-2, B, and <br />B-2 absorption <br />area loading rate <br />(gpd/ft2) <br />1.6 <br />1.0 <br />1.0 <br />0.78 <br />0.78 <br />0.6 <br />Treatment levels <br />A, A-2, B, and B-2 <br />mound absorption <br />ratio <br />1.0 <br />1.0 <br />1.6 <br />1.6 <br />2.0 <br />2.0 <br />2.6 <br />Copyright ©2014 by the Rev <br />so <br />of Statutes, State of Minnesota. All Rights Reserved. <br />