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OSTP Mound Design UNIVERSITY <br /> Minnesota Pollution Worksheet > 1 % Slope OF MINNESOTA .4"QNZ- <br /> Control Agency <br /> 1. SYSTEM SIZING: Project ID: v 06.12.13 <br /> A. Design Flow: 750 GPD TABLE IXa <br /> B. Soil Loading Rate: 0.45 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,B, <br /> C. Depth to Limiting Condition: 2.2 ft <br /> Percolation Rate Absorption Absorption <br /> (tel) nd <br /> Absorption Absorption <br /> Area Loading u Area Loading u <br /> D. Percent Land Slope: 6.0 Rate P Rate P <br /> (gWd/ft=) Ratio (8pd/ft=) Ratio <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 <br /> X0.1 - 1 - 1 <br /> F. Mound Absorption Ratio: 2.60 0.1 to 5 1.2 1 1.6 1 <br /> 0.1 to 5(fine sand <br /> 0.6 2 1 1 6 <br /> Table I and loamy fine sand) <br /> MOUND CONTOUR LOADING RATES: s to 15 0.78 1.5 1 1.6 <br /> Measured • Texture-derived <br /> Contour 16 to 30 0.6 2 0.78 2 <br /> Parc Rate OR mound absorption ratio Loading 31 to 45 0.5 2.4 0.78 2 <br /> Rate: 46 to 60 0.45 2.6 0.6 2.6 <br /> t <br /> 60mpi 1.0, 1.3. 2.0, 2.4. 2.6 - -12 61 to 120 5 0.3 5.3 <br /> ^..�� >120 - - - <br /> 61-120mpi OR 5.0 <_12 <br /> *Systems with these values are not Type I systems. <br /> 170 mai' s.o' _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 2.6 = 26.0 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 /> 26.0 ft - 10.0 ft = 16.0 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 />