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OSTP Mound Design <br /> .{ ©/ ��QUNIVERSITY <br /> Minnesota Poffution <br /> Control Agency Worksheet �" 1 !0 p� OF b11NNESOTA - <br /> 1. SYSTEM SIZING: Project ID: ~ <br /> v 03.19.15 <br /> A. Design Flow: 750 GPO TABLE IXa <br /> B. Soil Loading Rate: 0.60 GPD/ft1 LOADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA <br /> AND ABSORPTION RATIOS USING PERCOLATION TESTS <br /> l Treatment Level C Treatment Level A,A-2,B,, <br /> C. Depth to Limiting Condition: 1.3 ft <br /> Percolation Rate Absorption Absprptnn <br /> D. Percent Land Slope: 6.0 % tMwl Area Loading Mound Area Loath Mound <br /> Rate Absarpton Rat Absorptsnn <br /> I'�nt'I Ratty I ,I Rata <br /> E. Design Media Loading Rate: 1.2 GPD/ft" ,:. <br /> 1 1 , <br /> F. Mound Absorption Ratio: 2.00h- 1.2 1 1,6 1 <br /> Table I -a Aar -e,a•c. a.6 2 1 1.6 <br /> MOUND CONTOUR LOADING RATES: 0.76 15 1 1.6 <br /> Id4dSUt9d '` T4stut4 dGlirGd Contour e`<` 0.6 i 2 0.78 2 <br /> i <br /> Pert Rate OR mound abwrpocin•at Loading - 0,5 2.4 o 78 2 <br /> Rate: I <br /> i 0,45 2.6 0.6 2.6 <br /> 601,1; 1 C, 13 1 31.4 i.6 • _12 1 5 0:3 1 5.3 <br /> 4 <br /> 1'ILI,'lp1 ':-c 5.1; <br /> "Systems with these values are not Type I systems. <br /> 1zc r�o" 5.0• ,f. 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 = ft` <br /> 1 750 IGPD : I 1.2 IGPD/ft` = I 625 Ift` <br /> If a larger dispersal media area is desired, enter size:I 630 <br /> Ift: <br /> B. Enter Dispersal Bed Width: I 10.0 Ift Can not exceed 10 feet <br /> C. Calculate Contour Loading Rate: Bed Width X Design Media Loading Rate <br /> I10 Ift` X 1 1.2 JGPD/ft: = I 12.0 Igal/ft Con not exceed Table 1 <br /> D. Calculate Minimum Dispersal Bed Length: Dispersal Bed Area : Bed Width = Bed Length <br /> I630 Ift: = I 10.0 Ift = 63.0 ft <br /> 3. ABSORPTION AREA SIZING <br /> A. Calculate Absorption Width: Bed Width X Mound Absorption Ratio =Absorption Width <br /> I 10.0 Ift X I 2.0 I = I 20.0 Ift <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 /> I 20.0 Ift - I 10.0 1ft =1 10.0 fit <br /> 4. DISTRIBUTION MEDIA: ROCK <br /> A. Media Volume: Media Depth below and above pipe X Length X Width <br /> i1 0.75 I ft XI 63.0 Ift X 1 10.0 Ift= 1 473 I ft' 27 = I 18 Id <br />