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ONSITE <br /> SEWAGE <br /> Mound Design Worksheet TREATMENT <br /> Minnesota Pollution PROGRAM <br /> Control Agency <br /> 1. SYSTEM SIZING: <br /> A. Design Flow(Flow 8 Soil - 1.A) : 660 GPD Table I <br /> B. Soil Loading Rate(Flow fr Soil-3.C): 0.45 GPD/ftz MOUND CONTOUR LOADING RATES: <br /> Measured `-" Texture-derived Contour <br /> C. Depth to Limiting Condition: 1.0 ft per,Rate OR mound absorption ratio Loading <br /> Rate: <br /> D. Percent Land Slope: 5.0--J% s 60mpi 1.0, 1.3, 2.0, 2.4,2.6 -+ s12 <br /> E. Design Media Loading Rate: 1.2 r- y <br /> 61-120 mpi OR 5.0 s6 <br /> F. Mound Absorption Ratio(1.E:1.6): 2.67 <br /> e 120 mpi - <br /> G. Design Contour Loading Rate: 10.0 GPD/ft <br /> (From Table I - same as Linear Loading Rate) <br /> 2. DISPERSAL MEDIA SIZING <br /> A. Calculate Required Dispersal Bed Area: Design Flow (1.A) : Design Media Loading Rate (1.E) =ft2 <br /> 660 GPD : 1.20 GPD/ftz = 550.0 ft <br /> If a larger dispersal media <br /> area is desired, enter size: ft z <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/ftz = 10.0 ft <br /> C. Calculate Dispersal Bed Length: Dispersal Bed Area (2.A) : Bed Width (2.B) =Bed Length <br /> 550.0 ft2 10.0 ft = 55.0 ft <br /> D. Select Dispersal Media: 10 Rock <br /> ❑Other Approved Media <br /> 3. ABSORPTION AREA SIZING <br /> Note:Mound setbacks are measured from the Absorption Area. <br /> A. Calculate Absorption Width: Bed Width (2.8)X Mound Absorption Ratio (1.F) =Absorption Width <br /> 10.0 ft X 2.7 = 27.0 ft <br /> B. For slopes from 0 to 1%, the Absorption Width is measured from the bed equally in both directions. <br /> Calculate Absorption Width Beyond the Bed: Absorption Width (3.A) - Bed Width (2.6)+2= Width beyond Bed <br /> (�ft - �ft) += = ft <br /> C. For slopes >1%, the Absorption Width is measured downhill from the upslope edge of the Bed. <br /> Calculate Downslope Absorption Width: Absorption Width (3.A) - Bed Width (2.13) =ft <br /> 27.0 ft - 10.0 ft = 17.0 ft <br /> Comments: <br />