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OSTP Mound Design <br /> UNIVERSITY , <br /> Minnesota Pol{ution �yorksheet > 1 % Slope OF MINNESOTA :" <br /> Control Agency ���� <br /> 1. SYSTEM SIZING: Project ID: v 06.12.13 <br /> A. Design Flow: 750 GPD TABLE IXa <br /> B. Soil Loading Rate: 0.45 GPD/ft2 LOADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA <br /> AND ABSORPTION RATIOS USiNG PERCOLATION TESTS <br /> Treatment Level C Treatment Level A,A-2,B, <br /> C. Depth to Limiting Condition: 1.2 ft <br /> Vermletion Rate Ab'��0� Absorption <br /> (��) Area Loading Abwuntion Area Wading �sor� <br /> D. Percent Land Slope: 9.0 % Ra[e � Rate Pti°" <br /> (9Pd/k') Ratb (���i� Ratio <br /> E. Design Media Loading Rate: 1.2 GPD/ftZ _ <br /> <o, , � <br /> F. Mound Absorption Ratio: 2.60 °'to5 �2 > >.s � <br /> 0';0 5 ffine sarci 0.6 2 � �.6 <br /> Tdble 1 and I�a;n im.e ser�i <br /> Mi?UNU CONTOUR LOADING RATES: �'°'S o.�a �.5 � �,6 <br /> COtltOuf ��IO� 0.6 2 OJB 2 <br /> �.seawred " Taxture-Geiived <br /> Pei c Rate GR nound absc�ption ratio Loading 3i to 45 0.5 z.a o.�e 2 <br /> . R�tU: q�tc Go 0.45 2.6 0.8 2.6 <br /> -hOrnp' i.G. 1.3. L.0. 2.-I. ?.A cl'L G�to�?0 � 5 0.3 5.3 <br /> ,.�� _ . ' - <br /> 51-12G mpi OR 5.G _1't <br /> "5ystems with these values are not Type I systems. <br /> _ i�;,,,,�;• _F. Contour Loading Rate(linear loading rate)is a <br /> recommended value. <br /> 2. DISPERSAL MEDIA SIZING <br /> A. Calculate Dispersal Bed Area: Design Flow: Design Media l.oading Rate=ft2 <br /> 750 GPD = 1.2 GPD/ftZ = 625 ft2 <br /> If a larger dispersal media area is desired, enter size: 630 ftz <br /> B. Enter Dispersal Bed Width: 10.0 ft Con not exceed 10 feet <br /> C. Calculate Contour Loading Rate: Bed Width X Design Media Loading Rate <br /> �� ft2 X 1•2 GPD/ft2 = �2.0 gal/ft Can not exteed Tob(e 1 <br /> D. Calculate Minimum Dispersal Bed Length: Dispersat Bed Area : Bed Width = Bed Length <br /> 630 ftz : 10.0 ft = 63.0 ft <br /> 3. ABSORPTION AREA SIZING <br /> A. Calculate Absorption Width: Bed Width X Mound Absorption Ratio =Absorption Width <br /> 10.0 ft X 2.6 = 26.0 ft <br /> B. For slopes>1%, the Absorption Width is measured downhitt from the upslope edge of the Bed. <br /> Calculate Downs(ope 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 />