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- OSTP Mound Design Worksheet <br /> UNIVERSITY <br /> Minnesota Pollution <br /> Control Agency >1% Slope OF MINNESOTA ,,, �,r <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 Treatment Level C Treatment Level A,A-2,8, <br /> 1 Absorption Absorption <br /> D. Percent Land Slope: 7.0 % Percolation Rate Area Loading Mound Area Loading Mound <br /> (MPI) Rate Absorption Rate Absorption <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 (sprint') Ratio (gpd/ft') Ratio <br /> F. Mound Absorption Ratio(Table IXa): 2.00 >01 - 1 - 1 <br /> G. Design Contour Loading Rate: 12.0 GPD/ft !0.1 to 5 1.2 1 1.6 1 <br /> ;0.1 to 5(fine sand 0.6 2 1 1.6 <br /> Table I :and loamy fine sand) <br /> MOUND CONTOUR LOADING RATES: 16 to 15 0.78 1.5 1 1.6 <br /> Measured Toxturo-derived Contour 16 to 30 0.6 2 0.78 2 <br /> Per,:Rate OR mound absorption ratio Loading 31 to 45 0.5 2.4 0.78 2 <br /> Rate: <br /> :46 to 60 0.45 2.6 0.6 2.6 <br /> s 601-nai 1.0, 1.3.2.0.2.4.2.6 • :12 <br /> 'x.61 to 120 - 5 0.3 5.3 <br /> 61-120 repi OR 5.0 • _12 >120 - - - - <br /> 120 mpi- .5.0- • c6' '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)=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.G):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):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: 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 (2.6)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 />