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r_. OSTP Mound Design <br /> UNIVERSITY <br /> Minnesota Pollution �yorksheet > 1 % Slope OF MINNESOTA �r,,, <br /> Control Agency <br /> 1. SYSTEM SIZING: Project ID: v 07.14.15 <br /> A. Design Flow: 750 GPD TABLE IXa <br /> B. Soil Loading Rate: 0.45 GPD/ft2 LOADING RATES FOR DETERMINING BOITOM ABSORPTION AREA <br /> AND ABSORPTION RATIOS USING PERCOLATION TESTS <br /> 7Yeatme�K Level C TreatmfM Level A,A•2,8, <br /> C. Depth to Limitin�Condition: 1.5 ft <br /> Percolatia�Rate Are��ns Nbund �� Abund <br /> D. Percent Land Slope: 8.0 % �""P'> � ^��+ R.� �m�� <br /> fBPd/ft=) R°d° (�') R�tl° <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 _ _ <br /> <o, � � <br /> F. Mound Absorption Ratio: 2.60 0,cos �,2 � �,6 � <br /> 01 to 5(f�ne sarxi 0.6 2 1 1.6 <br /> Tdble I and�oa t�ne sand <br /> MOUND CONTOUR LOaDlNG RATES: 6�o�s o.rg �.6 � �.s <br /> C��� 16 to 30 0.6 2 0.78 2 <br /> Maawred ' Tsxturc•dorivod <br /> Porc Rats �R mow►d absorption rat' LO�� 3��o n5 o.s 2.a 0.7s 2 <br /> . ��: 46 to 60 0.46 2.8 0.6 2.6 <br /> s 6pmpi t.0, 1.3. 2.0.2.4.2.6 z i2 si co�20 . 5 0.3 6.3 <br /> , �1zo . . . . <br /> 61-120 mpi OR 5.0 _12 <br /> , "Systems with these values are not Type I systems. <br /> : �zo mp�•� ,S,o• _6. Contour Loading Rate (linear loading rate)is a <br /> recommended value. <br /> 2. DISPERSAL MEDIA SIZING <br /> A. Catculate Dispersal Bed Area: Design Flow:- Design Media Loading Rate=ft2 <br /> � 750 GPD : 1.2 GPD/ftz = 625 ftZ <br /> 1,`a ;arger dispersal media area is desired, enter size: 630 ft2 <br /> B. 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 /> i 10 ftz X 1•2 GPD/ftZ = 12.0 gat/ft Can not exceed Table 1 <br /> D. Calcutate Minimum Dispersal Bed Length: Dispersal Bed Area = Bed Width = Bed Length <br /> � 030 ft2 = 10.0 ft = 63.0 ft <br /> 3. ABSORPTION AREA SIZING <br /> A. Catcutate Absorption Width: Bed Width X Mound Absorption Ratio =Absorption Width <br /> 90.0 ft X 2.6 = 26.0 ft <br /> B. For slopes >1%, the Absorption Width is measured downhill from the upslope edge of the Bed. <br /> Catculate Downslope Absorption Width: Absorption Width - Bed Width <br /> 26.0 ft - 10.0 ft = 16.0 ft <br /> 4. DISTRIBUTION MEDIA: ROCK <br /> A. Media Volume: Media Depth X Length X Width <br /> 0.50 ft X 63.0 ft X 10.0 ft= 315 ft3 = 27 - �2 yd3 <br />