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7. . APPROXIMATE MOUND MATERIAL CALCULATIONS: <br /> A. Calculate Bed (rock) Volume: Bed Length (2.C)X Bed Width (2.B)X Depth = Volume (ft3) <br /> 50.0 ft X 10.0 ft X 1.0 = 500.0 ft3 <br /> Divide ft3 by 27 ft3/yd3 to calculate cubic yards: <br /> 500.0 ft3 + 27 = 18.5 yd3 <br /> Add 20%for constructability: 18.5 yd3 X 1.2 = 22.2 yd3 <br /> B. Calculate Clean Sand Volume: <br /> Upslope Volume: ((Upslope Mound Height - 1)x 3 x Bed Length)+2=cubic feet <br /> (( 4.0 ft - 1) X 3.0 ft X 50.0 )+2= 225.0 ft3 <br /> Downslope Volume: ((Downslope Height- 1) x Downslope Absorption Width x Media Length)+2=cubic feet <br /> (( 4.6` ft- 1) X 10.0 ft X 50.0 )+2= 900.0 ft3 <br /> Endslope Volume: (Downslope Mound Height- 1) x 3 x Media Width =cubic feet <br /> ( 4.6 ft- 1 ) X 3.0 ft X 10.0 ft = 108.0 ft3 <br /> Volume Under Rockbed:Average Sand Depth x Media Width x Media Length =cubic feet <br /> 2.3 ft X 10.0 ft X 50.0 ft = 1150.0 ft3 <br /> Total Clean Sand Volume: Upslope Volume +Downslope Volume +Endslope Volume + Volume Under Media <br /> 225.0 ft3 + 900.0 ft3 + 108.0 ft3 + 1150.0' ` ft3= 2383.0 ft3 <br /> Divide ft3 by 27 ft3/yd3 to calculate cubic yards: 2383.0 ft3 + 27 = 88.3 yd3 <br /> Add 20%for constructability: 88.3 yd3 X 1.2 = 105.9': yd3 <br /> C. Calculate Sandy Berm Volume: <br /> Total Berm Volume(approx): ((Avg.Mound Height- .5 ft topsoil)x Mound Width x Mound Length)+2=cu. ft. <br /> ( 4.3 0.5 )ft X 43.0ft X 78.0 )+2= 6372.6 ft3 <br /> Total Mound Volume- Clean Sand volume-Rock Volume=cubic feet <br /> 6372.6 ft3 - 2383.0 ft3 - 500.0 ft3 = 3489.6 ft3 <br /> Divide ft3 by 27 ft3/yd3 to calculate cubic yards: 3489.6 ft3 + 27 = 129.2 yd3 <br /> Add 20%for constructability: 129.2 yd3 x 1.2 = 155.1 yd3 <br /> D. Calculate Topsoil Material Volume: Total Mound Width X Total Mound Length X.5 ft <br /> 43.0 ft X 78.0 ft X 0.5 ft = 1677.0 ft3 <br /> Divide ft3 by 27 ft3/yd3 to calculate cubic yards: 1677:0 ft3 + 27 = 62.1 yd3 <br /> Add 20%for constructability: 62.1 yd3 x 1.2 = 74.5 yd3 <br /> I hereby certify that I have completed this work in accordance with all applicable ordinances,rules and laws. <br /> Joseph J Olson 810 6/7/09 <br /> (Designer) (Signature) (License#) (Date) <br />