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:: OSTP Mound Design Worksheet <br /> Minnesota Pollution <br /> UNIVERSITY � .. <br /> Control Agency 1% <br /> Slope OF MINNESOTA :'- <br /> 1. SYSTEM SIZING: Project ID: v 11.09.22 <br /> A.Design Flow(Flow&Soil- 1.A): 750 GPD TABLE IXa <br /> B. Soil Loading Rate(Flow&Soil-3.C): 0.60 GPD/ft2 LOADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA <br /> AND ABSORPTION RATIOS USING PERCOLATION TESTS <br /> C.Depth to Limiting Condition: 1.2 ft I Treatment Level C Treatment Level A,A-2,8, <br /> D.Percent Land Slope: 7.0 % Percolation Rate Absorption Mound Absorption Mound <br /> Area Loading Area Loading <br /> PAP* Rate Absorption Rate Absorption <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 (gpd/t') Ratio (sprint) Ratio <br /> F.Mound Absorption Ratio(Table IXa): 2.00 <0.1 - 1 - 1 <br /> G.Design Contour Loading Rate: 12.0 GPD/ft 1011. 11 1 1.6 1 <br /> 0.1 to 5(fine sand <br /> Table I land loamy fine sand) 0:6 2 1 1.6 <br /> MOUND CONTOUR LOADING RATES: j6 to 15 0.78 1.5 1 1.6 <br /> Measured Texture.derived Contour' 1610 30 0.6 2 0.78 2 <br /> Parc Rate OR mound absorption ratio Loadlns, 31 to 45 0.5 2.4 0.78 2 <br /> Rata <br /> 4610 60 0.45 2.6 0.6 2.6 <br /> 560mpi 1.0,1.3.2.0.2.4,2,6 <_l2 <br /> 61to120 - 5 0.3 5.3 <br /> 61.120 ntpi OR 5.0 - _12 >120 - _ - <br /> >_120 mpi' %5.0' - s5' `Systems with these values are not Type I systems. Contour Loading Rate(linear <br /> loading rate)is a recommended value. <br /> 2. DISPERSAL MEDIA SIZING <br /> A. Calculate Required Dispersal Bed Area:Design Flow(1.A)a Design Media Loading Rate (1.E)=ft2 <br /> If a larger dispersal media area 750 GPD: 1.20 GPD/ft2 = 625 ft2 <br /> is desired,enter size: <br /> ft2 <br /> B. Calculate Dispersal Bed Width:Contour Loading Rate (1.6):Design Media Loading Rate (1.E)=Bed Width <br /> 12.0 ft : 1.2 gpd/ft2 = 10 ft <br /> C. Calculate Dispersal Bed Length: Dispersal Bed Area (2.A) 1 Bed Width (2.B)=Bed Length <br /> 625 ft2 : 10 ft = 63 ft <br /> D. Select Dispersal Media: rock <br /> E. If using a registered product,enter the Component Length: in: 12 = ft <br /> F. If using a registered product,enter the Component Width: in C 12 = ft <br /> G.Number of Components per Row=Bed Length (2.C)divided by Component Length (4.J)(Round up) <br /> ft : ft= components/row <br /> H. Number of Rows =Bed Width (2.B)divided by Component Width (4.K)(Round up) Note:CLR of 10.3 <br /> gal/ft results in 9 foot <br /> Adjust Contour Loading Rate on Design Summary page until this number is a whole number wide bed. <br /> ft: ft= rows <br /> I. Total Number of Components =Number of Components per Row X Number of Rows <br /> X = components <br />