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A. Calculate Clean Sand Lift: 3 feet minus Depth to Limiting Layer (1.C)= Clean Sand Lift (1 ft minimum) <br /> 3.0 ft - 1.0 ft= 2.0 ft <br /> B. Calculate Upslope Height: Clean Sand Lift (4.A) +media depth (1 ft.) + cover (1 ft.)= Upslope Height <br /> 2.0 ft + 1.0 ft+ 1.0 ft= 4.0 ft <br /> C. Select Upslope Berm Multiplier <br /> (based on land slope): 3.57 (figure D-34) <br /> D. Calculate Upslope Berm Width: Multiplier (4.C)X Upslope Mound Height (4.B)= Upslope Berm Width <br /> 3.57 x 4.0 ft = 14.0 ft <br /> E. Calculate Drop in Elevation Under Media:Media Width (2.B) X Land Slope(1.E) : 100=Drop (ft) <br /> 10.0 x 3.0 %= 100= 0.3 ft <br /> F. Calculate Downslope Mound Height: Upslope Height (4.B) +Drop in Elevation (4.E) =Downslope Height <br /> 4.0 ft + 0.3 ft= 4.3 ft <br /> Select Downslope Berm Multiplier <br /> G. (based on land slope): 4.54 (figure D-34) <br /> H. Calculate Downslope Berm Width:Multiplier (4.G)X Downslope Height (4.F) =Downslope Berm Width <br /> 4.54 x 4.3 ft = 19.0 ft <br /> I. Calculate Minimum Berm to Cover Absorption Area: Downslope Absorption Width (3.B or 3.C)+4 ft. =ft <br /> 10.0 ft+ 4 ft= 14.0 ft <br /> J. Design Downslope Berm =greater of 4H and 41: 19.0 ft <br /> K. Select Endslope Berm Multiplier: 3.00 (usually 3.0 or 4.0) <br /> L. Calculate Endslope Berm (4.K)X Downslope Mound Height (4.F) =Endslope Berm Width <br /> 3.00 x 4.3 ft= 14.0 ft <br /> M. Calculate Mound Width: Upslope Berm Width(4.D) +Media Width (2.B) +Downslope Berm Width (4.J)=ft <br /> 14.0 ft + 10.0 ft+ 19.0 ft = 43.0 ft <br /> N. Calculate Mound Length: Endslope Berm Width (4.L) +Media Length (2.C) +Endslope Berm Width (4.L) =ft <br /> 14.0 ft+ 50.0 ft+ 14.0 ft= 78.0 ft <br /> D-34:Scope Multiplier Table <br /> Land Slope% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 <br /> Upslope 3:1 3.00 2.91 2.83 2.75 2.68 2.61 2.54 2.48 2.42 2.36 2.31 2.26 2.21 2.17 2.13 2.09 2.06 2.03 2.00 1.97 1.95 1.93 1.91 1.89 1.87 1.85 <br /> Berm Ratio 4:1y4.00 3.85 3.70 3.57 3.45 3.33 3.23 3.12 3.03 2.94 2.86 2.78 2.70 2.62 2.55 2.48 2.41 2.35 2.29 2.23 2.18 2.13 2.08 2.03 1.98 1.93 <br /> Land Slope% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 <br /> Downslope 3:1 3.00 3.09 3.19 3.30 3.41 3.53 3.66 3.80 3.95 4.11 4.29 4.48 4.69 4.95 5.24 5.55 5.88 6.24 6.63 7.04 7.47 7.93 8.42 8.93 9.46 10.02 <br /> Berm Ratio 4:1 4.00 4.17 4.35 4.54 4.76 5.00 5.26 5.56 5.88_6.25 6.67 7.14 7.69 8.29 8.92 9.57 10.24 10.94 11.67 12.42 13.19 13.99 14.82 15.67 16.54 17.44 <br /> 5. ORGANIC LOADING: (if pretreatment is being used) <br /> A. Organic Loading = Design Flow X Estimated BOD in mg/L in the effluent X 8.35 : 1,000,000(See Table III) <br /> gpd X mg/L X 8.35 : 1,000,000 = lbs BOD/day <br /> B. Calculate System Organic Loadin : lbs. BOD (5.A) T Media Area (2.A) = lbs/day/ft2 <br /> lbs/day ft2 = lbs/day/ft2 <br /> Table III (7083.4030) <br /> BOD Treatment BOD (mg/L) <br /> Level A 15 <br /> Level B 25 <br /> Level C 125 <br /> 6. MOUND DIMENSIONS <br />