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� I 1 1. <br /> \ , � � OSTP Mound Design <br /> UNIVERSITY <br /> Minnesota Pollution �yorksheet > 1 % Slope OF 1VlINNESOTA � <br /> Control Agency �' <br /> 1. SYSTEM SIZING: Project ID: v 06.12.13 <br /> a. Design Flow: �5o GPD TABLE IXa <br /> Z LOADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA <br /> B. Soil Loading Rate: �.45 GPD/ft AND ABSORPTION RATI05 USING PERCOlATION TESTS <br /> 7Ye�tmeM Level C 7Y�adn�M LevN A,A4,8, <br /> C. Depth to Limiting Condition: 1.7 ft <br /> Peraolatlon Rate � Mo�d � Mound <br /> AfN IA�dlll� ARa LAl�lle <br /> D. Percent Land Slope: 10.0 % �''"P'> R.c� Ab�O" wc� Ab'Of�"0" <br /> cw�+�'� a'a° c�'� rtan° <br /> E. Design Media Loading Rate: 1.2 GPD/ftZ �o, . � . � <br /> F. Mound Absorption Ratio: 2.60 o,cos �.z � �.e � <br /> 01 to 5(fine sand 0.6 2 1 1.6 <br /> Table 1 anu�oa �ine sa <br /> MOl1HD CONTOIDR LOADlNG RATES: 6 to t5 0.78 1.6 1 1.6 <br /> �t� 16 to 30 0.6 2 0.78 2 <br /> tiWawrcd ' Toxturo-dcriv�d 3��o� o.s 2.a o.78 2 <br /> Porc Rato � mand absorption ratio �� <br /> ��: 46 to 60 0.46 2.6 0.8 2.8 <br /> s 60mpi 7.0. 1.3.2.0.2.v.2.6 st2 si co i2o - S 0.3 6.3 <br /> , >1zo - - - - <br /> ei•�Zo mpi oa 5.0 =12 •Systems with these values are not Type I systems. <br /> = tza mpi' -5.0' _6. Contour Loading Rate (linear loading rate)is a <br /> recommended value. <br /> 2. DISPERSAL MEDIA SIZING <br /> A. Calculate Dispersal Bed Area: Design Ftow= Design Media Loading Rate =ftZ <br /> 750 GPD = 1.2 GPD/ftZ = 625 ft2 <br /> If a larger dispersat media area is desired, enter size: 630 ftZ <br /> B. Enter Dispersal Bed Width: 10.0 ft Can not exceed 10 feet <br /> C. Catculate Contour Loading Rate: Bed Width X Design Media Loading Rate <br /> �� ftZ X 1•2 GPD/ft� = 12.0 gal/ft Can not exceed Table 1 <br /> D. Calculate Minimum Dispersal Bed Length: Dispersal Bed Area = Bed Width = Bed Length <br /> 630 ftz ; 10.0 ft = 63.0 ft <br /> 3. ABSORPTION AREA SIZING <br /> A. Calcutate Absorption Width: Bed Width X Mound Absorption Ratio =Absorption Width <br /> 10.0 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 /> Calculate 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 /> 1.00 ft X 63.0 ft X 10.0 ft= 630 ft3 = 27 = 23 yd3 <br />