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OSTP Mound Design <br /> UNIVERSITY ' <br /> Minnesota Pollution Worksheet > 1 % Sloe �, ' <br /> OF MINNESOTA <br /> Control Agency P ��, <br /> 1. SYSTEM SIZING: Project ID: v 06.12.13 <br /> A. Design Flow: 600 GPD TABLE IXa <br /> B. Soil Loading Rate: 0.60 GPD/ft2 LOADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA <br /> AND ABSORPTION RATIOS USING PERCOLATION TESTS <br /> Treatment Level C Treatment Level A,A-2,8, <br /> C. Depth to Limiting Condition: 2.0 ft <br /> Percolation Rate Absorption Absorption <br /> Area Loading NoUOd Area Loading Mound <br /> D. Percent Land Slope: 3.0 % (MPI) Rate Absorption Rate Absorption <br /> (BP&ft') Ratio (>SP�ft=) Ratio <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 <br /> <01 _ 1 - 1 <br /> F. Mound Absorption Ratio: 2.00 011,5 7.2 1 1.5 1 <br /> 01 to 5(fine sand 0.6 2 1 1.6 <br /> Table I and loamy fine sand) <br /> MOUND CONTOUR LOADING RATES; 6 t 15 0.78 1.5 1 1.6 <br /> Contour 16 lo 30 0.6 2 0.78 2 <br /> measured ' Texture-derived <br /> Perc Rate OR mound absorption ratio Loading 37 to 45 0.5 2.4 0.78 2 <br /> Rate: 46 to 60 0.45 2.6 0.6 2.6 <br /> 60rnp' 1.0, 1.3.Z.O. 2.4. 2.6 • :12 67 to 120 5 0.3 6.3 <br /> �...... >120 - - - - <br /> 61-120 mpi of 5.0 • =1i *Systems with these values are not Type I systems. <br /> 120 mp; �. f.6. Contour Loading Rate (linear loading rate)is a <br /> recommended value. <br /> 2. DISPERSAL MEDIA SIZING <br /> A. Calculate Dispersal Bed Area: Design Flow= Design Media Loading Rate=ft2 <br /> 600 GPD : 1.2 GPD/ft2 = 500 ft2 <br /> If a larger dispersal media area is desired, enter size: ft2 <br /> B. Enter Dispersal Bed Width: 10.0 ft Can not exceed 10 feet <br /> C. Calculate Contour Loading Rate: Bed Width X Design Media Loading Rate <br /> 10 ft2 X 1.2 GPD/ft2 = 12.0 gal/ft Can not exceed Table 1 <br /> D. Calculate Minimum Dispersal Bed Length: Dispersal Bed Area _ Bed Width = Bed Length <br /> 500 ft2 : 10.0 ft = 50.0 ft <br /> 3. ABSORPTION AREA SIZING <br /> A. Calculate Absorption Width: Bed Width X Mound Absorption Ratio =Absorption Width <br /> 10.0 ft X 2.0 = 20.0 ft <br /> B. For slopes>1%, the Absorption Width is measured downhill from the upslope edge of the Bed. <br /> Calculate Downslope Absorption Width: Absorption Width - Bed Width <br /> 20.0 ft - 10.0 ft = 10.0 ft <br /> 4. DISTRIBUTION MEDIA: ROCK <br /> A. Media Volume: Media Depth X Length X Width <br /> 1.00 ft X 50.0 ft X 10.0 ft= 500 ft3 = 27 = 19 yd3 <br />