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4. APPROXIMATE VOLUME CALCULATIONS: <br /> A. Rock Area =Absorption Bed Length (1.F) X Absorption Bed Width (1.E) <br /> 75.0 ft X 10.0 �ft = 750.0 ftz <br /> B. Rock Vo(ume in Cubic Feet = Rock Area (4.A) by Depth of Media (Rock) (1 foot) and divide by 2. <br /> 750.0� ftz X 1 ft : 2 = 375.O�ft3 <br /> C. Rock Vo(ume in Cubic Yards = Vo(ume in Cubic Feet (4.6) divided by 27 <br /> 375.�ft3 : 27 = 13.9 yd3 <br /> D. Loamy or Sandy Loam Cover Materia( Vo(ume: <br /> Volume in Cubic Feet= System Width (2.J)X System Length (2.K)X 1.5 :2, minus rock vo(ume (4.8) <br /> ( 24.0 ft X 91.0 ft X 1.5 : 2) - 375.0 = 1260.3 ft3 <br /> E. Loamy or Sandy Loam Cover Vo(ume in Cubic Yards = Volume in Cubic Feet (4.D) divided by 27 <br /> 1260.3 ft3 : 27 = C46.7 yd3 <br /> F. Add 20% for constructability: 46.7 yd3 X 1.2 = 56.0 yd3 <br /> G. Topsoil Volume in Cubic Feet = System width (2.J) X System Length (2.K) x 0.5 <br /> 24.0 X 91.� X 0.5 = 1090.2 ft3 <br /> H. Topsoi( Vo(ume in Cubic Yards = Volume in Cubic Feet (4.G) divided by 27 <br /> 1090.2 ft3 : 27 = 40.4 yd3 <br /> I. Add 20%for constructability: 40.4 yd3 X 1.2 = 48.5 yd3 <br /> 5. Or anic Loadin : o tional <br /> A. Organic loading = Design Flow (1.A) X Estimated BOD in mg/L in the effluent X 8.35 : 1,OOO,Q00 (Table III) <br /> 450�gpd X mg/L X 8.35 : 1,000,000 = lbs BOD/day <br /> B. Catculate System Orgonic Loading: (bs. BOD (5.A) :Absorption Bed Areo (1.G) = lbs/day/ft2 <br /> lbs/day = ftZ = tbs/day/ft2 <br /> 5. Comments: <br /> I hereby certify that I have completed this work in accordance with atl applicable ordinances, rules and laws. <br /> Joseph J Olson 810 8/10/09 <br /> (Designer) (Signature) (License#) (Date) <br />