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OSTP Mound Design UNIVERSITY <br /> Minnesota Pollution O <br /> Worksheet � 1 / Slope OF M1NI�ESOTA `"' <br /> Control Agency -�`-=�' <br /> 1. SYSTEM SIZING: Project ID: v 06.12.13 <br /> A. Desi�n Flow: 260 GPD TABLE IXa <br /> B. Soil Loading Rate: 0.45 GPD/ftZ LOADING RA7ES FOR DETERMINING BOTTOM ABSORPTION AREA <br /> AND ABSORPTION RATIOS USING PERCOLATION TESTS <br /> Treatment Level C Treatment Level A,A-2,6, <br /> C. Depth to Limiting Condition: 2.0 ft <br /> Abwrption Absorp[ion <br /> Permletlon Rate Nound Mound <br /> Mea loading Area Loading <br /> D. Percent Land Slope: 6.0 % �""P�� Rate "bsorp°°" Rate �5°rption <br /> (��ft=� Ratio (�d�k=� Ratio <br /> E. Design Media Loading Rate: 1.Z GPD/ftZ _ _ <br /> ��'� 1 1 <br /> F. Mound Absorption Ratio: 2.40 °'�°s �•2 � '.s � <br /> 0.-to S(Ime sand 0.6 2 1 1.6 <br /> Tdblp! anAlnam tirwsanci <br /> MUUIdU CONTOUF LC�t�LW�RATES: �to's o.�e o.s a t6 <br /> h'.e�s�Jrcd 79,:iurc-�j�r�,o<! <br /> ContCur �r tc 30 0.6 2 0.78 2 <br /> - C,p .^ ^�L, ✓ _�, LU3dt�l� 3?ta�Ig 0.5 2.4 0.76 2 <br /> �'pfC Rd[P r�.p l�i� _ ��'i.,.�. `�i�0 <br /> . Ratn� a,ro o0 0.45 2.6 0.6 2.6 <br /> G1 to�r0 5 0.3 5.3 <br /> _6Ji�i'� _. I _ _._ :.-.. � 6 _iG � <br /> 't:^ - - - - <br /> hl-IZG mGi CF' S.C, �tZ <br /> "Systems with these values are not Type I systems. <br /> , �;� ,__`,. � �_• F. Contour Loadin� 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=ft� <br /> 260 GPD = 1.2 GPD/ftz = Z�7 ftZ <br /> If a larger dispersal media area is desired, enter size: 220 ft2 <br /> B. Enter Dispersal Bed Width: 10.0 ft Cvn not exceed 10 feet <br /> C. Calculate Contour Loading Rate: Bed Width X Design Media Loading Rate <br /> 10 ft� X �•2 GPD/ft� = 12•0 gaUft Can not exceed Toble 1 <br /> D. Calculate Minimum Dispersal Bed Length: Dispersal Bed Area = Bed Width =Bed Length <br /> 220 ft� : 10.0 ft = 22.0 ft <br /> 3. ABSORPTION AREA SIZING <br /> A. Calculate Absorption Width: Bed Width X Mound Absorption Ratio =Absorption Width <br /> 10.0 ft X 2.4 - 24.0 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 /> 24.0 ft - 10.0 ft = 14.0 ft <br /> . DISTRIBUTION MEDIA: ROCK <br /> A. Media Volume: Media Depth X Length X Width <br /> 1.00 ft X 22.0 ft X 10.0 ft= 220 ft3 : 27 = �yd3 <br />