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Minnesota Pollution <br />Control Agency <br />©STP Mound Design UNIVERSITY <br />Worksheet < 1 % Slope Off' MINNESOTA <br />SYSTEM SIZING: <br />A. Design Flow: <br />B. Soil Loading Rate: <br />C. Depth to Limiting Condition <br />D. Percent Land Slope: <br />E. Design Media Loading Rate: <br />F. Mound Absorption Ratio: <br />Project ID: 07142017Soil <br />300 GPD <br />1.50 GPD/ft2 <br />1.0 ft <br />1.0 % <br />1.0 GPD/ft2 <br />1.50 <br />Table I <br />MOUND CONTOUR LOADING RATES: <br />Measured <br />Texture -derived <br />Level C <br />Contour <br />Perc Rate <br />OR <br />mound absorption ratio <br />Percolation Rate <br />Loading <br />Area Loading <br />Absorption <br />Area Loading Absorption <br />on <br />Rato: <br />s 60mpi <br />OR <br />1.0. 1.3. 2.0. 2.4. 2.6 <br />,12 <br />61-120 rnpi <br />5.0 <br />z12 <br />- 120 mpi' <br />>5.0' <br />1.6 1 <br />DISPERSAL MEDIA SIZING <br />v 04.06.201 <br />TABLE IXa <br />LOADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA <br />AND ABSORPTION RATIOS USING PERCOLATION TESTS <br />Treatment <br />Level C <br />Treatment Level A, A-2, B, <br />Absorption <br />Mound <br />Absorption Mound <br />Percolation Rate <br />(.) <br />Area Loading <br />Absorption <br />Area Loading Absorption <br />on <br />Rate <br />(gP_'ft2I <br />Ratio <br />Rate <br />(1v it,) Ratio <br />'01 <br />1 <br />1 <br />01 to <br />1.2 <br />1 <br />1.6 1 <br />0 1 to 5 (Me sand <br />0.6 <br />2 <br />1 1.6 <br />and loa fine sa <br />6 to 15 <br />0,76 <br />1.5 <br />1 1.6 <br />16 to 30 <br />0.5 <br />2 <br />0.78 2 <br />31 to 45 <br />0,6 <br />2.4 <br />0.78 2 <br />46to60 <br />0.46 <br />2.6 <br />0.6 2.6 <br />61 to 120 <br />- <br />5 <br />0.3 5.3 <br />,120 <br />- <br />- <br />*Systems with these values are not Type I systems. <br />Contour Loading Rate (linear loading rate) is a <br />recommended value. <br />A. Calculate Dispersal Bed Area: Design Flow (1.A) : Design Media Loading Rate (1.E) = ft' <br />300 GPD : 1.0 GPD/ft2 = 300 ft <br />If a larger dispersal media area is desired, enter size:ft2 <br />B. Enter Dispersal Bed Width: 10 ft Can not exceed 10 feet. <br />C. Calculate Contour Loading Rate: Bed Width (2.13) X Design Media Loading Rate (1.E) <br />10 ft X 1.0 GPD/ft2 = 10.0 gal/ft Can not exceed Table 1 <br />D. Calculate Minimum Dispersal Bed Length: Dispersal Bed Area (2.A) : Bed Width (2.6) = Bed Length <br />300 <br />ft 10 ft = ft <br />ABSORPTION AREA SIZING <br />A. Calculate Absorption Width: Bed Width (2.6) X Mound Absorption Ratio (1.F) = Absorption Width <br />10.0 ft X 1.5 = 15.0 ft <br />B. For slopes from 0 to 1%, the Absorption Width is measured from the bed equally in both directions. <br />Absorption Width Beyond the Bed: Absorption Width (3.A) - Bed Width (2.13) = 2 = Width beyond Bed <br />( 15,0 ft - 10.0 ft) - 2 = 2.5 ft <br />