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OSTP Mound Design <br /> UNIVERSITY <br /> Minnesota Pollution �yorksheet �1 � ��Q e �'^ �`"� <br /> Controi Agency p OF MINNESOTA _ �,,,,�.�, <br /> 1. SYSTEM SIZING: Project ID: v 06.12.13 <br /> A. Design Flow: 750 GPD TABLE IXa <br /> B. Soit Loading Rate: 0.45 GPD/ftZ LOADING RATES FOR DETERMINING BOlTOM ABSORPTION AREA <br /> AND ABSORPTION RATIOS USING PERCOLATION TESTS <br /> TrcetmeM Level C Treatment levei A,A-2,B, <br /> C. Depth to Limiting Condition: 1.0 ft <br /> Percolation Rate �S°rptlon Absorption <br /> Nea loading �'1Ound Area Loading MOU� <br /> D. Percent Land Stope: 6.0 % �'`'�'� Rau 1bso�"°" Ratr ��°'�"°^ <br /> (4vd/ft') rtatio (��fti' Ratio <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 . <br /> `�'' 1 'I <br /> F. Mound Absorption Ratio: 2.70 °'`°5 �2 � +.s � <br /> 0'to 5(line sar.d <br /> Tabie I anoloa. t�nesancl Q'6 2 � 1.6 <br /> h50UND lONTOUR LOADING RATES: 61O�•`' 0.78 �.5 1 1.6 <br /> �.�eawred ' Texture•derived <br /> Contaur �s to?o 0.6 2 0.78 2 <br /> Perc Rate Q� n?ound absosption ratio Loading 3'i to 45 0.5 2.a o.�8 2 <br /> . Rate� qg��gp 0.45 2.6 0.6 2.6 <br /> -50ntp' t.0. 1.±. 2.U. 2.4. 2.5 _1 t G1 to 120 - 5 0.3 b.3 <br /> ' '��� - - - - <br /> �1-12�ntpi GR S.0 :12 <br /> . "Systems with these values are not Type I systems. <br /> = �Zb,»�;• ;5 �• _�. 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 Loading Rate=ftz <br /> 750 GPD � 1.2 GPDJftZ = b25 ftZ <br /> If a larger dispersal media area is desired,enter size: 630 ftZ <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 /> �� ftZ X 1•2 GPD/ftz = 12.0 gal/ft Can not exceed Table 1 <br /> 0. Calculate Minimum Dispersat Bed Len�th: Dispersal 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 2.7 = 27.0 ft <br /> B. For slopes>1%, the Absorption Width is measured downhill from the upslope edge of the Bed. <br /> Calcutate Downslope Absorption Width: Absorption Width - Bed Width <br /> 27.0 ft - 10.0 ft = 17.0 ft <br /> 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 /> __.._ <br />