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OSTP Mound Materials UNIVERSITY - Minnesota Pollution Worksheet OF MINNESOTA Control Agency A. Calculate Bed (rock) Volume: Bed Length (2.C)X Bed Width (2.B)X Depth = Volume (ft3) 50.0 ft X 10.0 ft X 1.0 = 500.0 ft3 Divide ft3 by 27 ft3/yd3 to calculate cubic yards: 500.0 ft3 _ 27 = 18.5 yd3 Add 20%for constructability: 18.5 yd3 X 1.2 = 22.2 yd3 B. Calculate Clean Sand Volume: Upslope Volume: ((Upsiope Mound Height - 1)x 3 x Bed Length)_2=cubic feet (( 3.8 ft - 1) X 3.0 ft X 50.0 )=2= 212.5 ft3 Downslope Volume: ((Downslope Height- 1) x Downslope Absorption Width x Media Length)_2 =cubic feet (( 4.3 ft- 1) X 10.0 ft X 50.0 )_2= 833.3 ft3 Endslope Volume: (Downslope Mound Height- 1) x 3 x Media Width =cubic feet ( 4.3 ft- 1 ) X 3.0 ft X 10.0 ft = 100.0 ft3 Volume Under Rock bed:Average Sand Depth x Media Width x Media Length =cubic feet 2.1 2.1 ft X 10.0 ft x 50.0 ft = 1041.7 ft3 Total Clean Sand Volume: Upslope Volume +Downslope Volume +Endslope Volume + Volume Under Media 212.5 ft3 + 833.3 ft3 + 100.0 ft3 + 1041.7 ft3= 2187.5 ft3 Divide ft3 by 27 ft3/yd3 to calculate cubic yards: 2187.5 ft3 : 27 = 81.0 yd3 Add 20%for constructability: 81.0 yd3 X 1.2 = 97.2 yd3 C. Calculate Sandy Berm Volume: 4.1 Total Berm Volume(approx): ((Avg. Mound Height- .5 ft topsoil)x Mound Width x Mound Length)-2=cu. ft. ( 4.1 _ 0.5 )ft x 43.0 ft x 76.0 )÷2= 5855.2 ft3 Total Mound Volume- Clean Sand volume-Rock Volume=cubic feet 5855.2 ft3 - 2187.5 ft3 - 500.0 ft3 = 3167.7 ft3 Divide ft3 by 27 ft3/yd3 to calculate cubic yards: 3167.7 ft3 _ 27 = 117.3 yd3 Add 20%for constructability: 117.3 yd3 x 1.2 = 140.8 yd3 D. Calculate Topsoil Material Volume: Total Mound Width X Total Mound Length X.5 ft 43.0 ft x 76.0 ft X 0.5 ft = 1634.0 ft3 Divide ft3 by 27 ft3/yd3 to calculate cubic yards: 1634.0 ft3 _ 27 = 60.5 yd3 Add 20%for constructability: 60.5 yd3 x 1.2 = 72.6 yd3 I hereby certify that I have completed this work in accordance with all applicable ordinances, rules and laws. Joseph J Olson 810 07/08/10 (Designer) (Signature) (License#) (Date)