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� � OSTP Mound Design <br /> � UNIVERSITY �. <br /> Minnesota Pollution �yorksheet > 1 % Slope OF MINNESOTA J-�,,, <br /> Control Agency <br /> 1. SYSTEM SIZING: Project ID: v 04.20.2016 <br /> a. Design Flow: �5o GPD TABLE IXa <br /> 2 LOADING RATES FOR DETERMMING 80TTOM ABSORPTION AREA <br /> B. Soil Loading Rate: 0.60 GPD/ft AND ABSORPTION RATIOS USING PERCOLATION TESTS <br /> TreatmeM Level C TrNtmeiK Level A,A-2,B, <br /> C. Depth to Limiting Condition: �ft nb,��� <br /> a�r�a.nw,a.ce �°" /�AO,,,,a �now�a <br /> D. Percent Land Slope: 10.0 % �"'P'� �e a�e� i4b�tl°" �n��� A°m�"o" <br /> t�'� n'e�° c�'� e'�a° <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 ro., _ � _ � <br /> F. Mound Absorption Ratio: 2.70 0.�co s i.z � �.B a <br /> o.,to s(flne sand o.8 z , 1.6 <br /> Table I e�d we rne sa <br /> MOUND CONTOUR LOADING RATES: 6�'s o.�s �.s � �.s <br /> Contour �s w 3° o.s z o.7s 2 <br /> Meawrvd � Toxturo-daivcd ��g s�w a� o.s 2.a o.�s 2 <br /> Porc Rate mound absorption ratio ��: <br /> --. 46 to 60 0.45 2.6 0.6 2_6 <br /> S 60mp1 1.0, 1.3,2.0,2.4,2.6 -. t12 61 to 120 . 5 0.3 6.3 <br /> ��20 - - - - <br /> 61-120 mpi OR 5.0 s12 <br /> _, 'Systems with these values are not Type I systems. <br /> L t2o mp> >5.0• � �6• Contour Loading Rate (linear loading rate)is a <br /> recommended value. <br /> 2. DISPERSAL MEDIA SIZING <br /> A. Calcutate Dispersal Bed Area: Design Flow:Design Media Loading Rate=ftz <br /> 750 GPD : 1.2 GPD/ft2 = 625 ft2 <br /> If a larger dispersal media area is desired, enter size:�ftZ <br /> 6. Enter Dispersal Bed Width: 10.0 ft Can not exceed 10 feet <br /> C. Calculate Contour Loading Rate: Bed Width X Design Media Loading Rate <br /> 1� f�2 X 1•2 GPD/ftZ = 12•0 gal/ft Can not exceed Table 1 <br /> D. Calculate Minimum Dispersal Bed Length: Dispersal Bed Area : Bed Width = Bed Length <br /> 625 ftz : 10.0 ft = 62.5 ft <br /> 3. ABSORPTION AREA SIZING <br /> A. Calculate Absorption Width: Bed Width X Mound Absorption Ratio =Absorption Width <br /> 10.0 ft X 2.7 = 27.0 ft <br /> 6. For slopes>1%, the Absorption Width is measured downhill frorn the upslope edge of the Bed. <br /> Calculate Downslope Absorption Width: Absorption Width - Bed Width <br /> 27.0 ft - 10.0 ft = 17.0 ft <br /> 4. DISTRIBUTION MEDIA: ROCK <br /> A. Rock Media Depth Below Distribution Pipe <br /> 1.00 ft estimated volume of rock on mound materials page <br />