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OSTP Mound Design <br /> UNIVERSITY '' <br /> Minnesota Pollution Worksheet > 1 °/0 OF MINNESOTA Slope "` ,. <br /> Control Agency <br /> y <br /> 1. SYSTEM SIZING: Project ID: v 06.12.13 <br /> A. Design Flow: 750 GPD TABLE 1Xa ;. <br /> B. Soil Loading Rate: 0.60 GPD/ft2 LOADING RATES FOR DEItKMININGBOTTOM"ABSORPTION AREA <br /> AND ABSORPTION RATIOS USING PERCOLATION TESTS <br /> Treatment Level C Treatment Level A,A-2,B, <br /> C. Depth to Limiting Condition: 2.0 ft Absorption Absorption <br /> Percolation Rate Mound Mound. <br /> (MPI) <br /> Area.Loading Absorption Area Loading Absorption <br /> D. Percent Land Slope: 3.0 % nate Rate <br /> Ratio <br /> (4Pd/tt1) (WPdlfte) " Ratio <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 <o i - . - 1 <br /> F. Mound Absorption Ratio: 2.00 0.1 10 5 1.2 1 1.6 1 <br /> 0.1 to 5(tine sand 0.6 2 1 1.6 <br /> Table l and loamy tine same) <br /> MOUND CONTOUR LOADING RATES: 6 to 15 0.78 1.5 1 1.6 <br /> Contour. 16 to 30 0.6 2 0.78 2 <br /> Measured Texture-derived - <br /> OR Loading ' 31 to 45 0.5 2.4 0.78 2 <br /> Perc Rata mound absorption ratio Rata: <br /> 46 to 60 0.45 2.6 0.6 2.6 <br /> t.60n1pi 1.0, 1.3,2.0,2.4,2.6 s12 6110 120 5 0.3 5.3 <br /> >120 <br /> 61-120 mpi OR 5.0 . .112 <br /> *Systems with these values are not Type I systems. <br /> 120 moi ;y,n• ;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 /> 750 GPD + 1.2 GPD/ft2 = 625 ft2 <br /> If a larger dispersal media area is desired, enter size: 630 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 /> 630 ft2 + 10.0 ft = 63.0 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 63.0 ft X 10.0 ft= 630 ft3 + 27 = 23 yd3 <br />