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� _ OSTP Mound Design UNIVERSITY ' `' `` = <br /> Minnesota Pollution Worksheet >1 % Stope OF MINNESOTA n;'���� `"� <br /> Control Agency �'1.'�� <br /> 1. SYSTEM SIZING: Project ID: v 06.12.13 <br /> a. Design Flow: 750 GPD TABLE IXa <br /> B. Soil Loading Rate: O.GO GPD/ftZ LOADING RATES FOR DETERMINING 807TOM ABSORPTION AREA <br /> AND A850RPTION RATIOS USING PERCOI.ATION TESTS <br /> �Treatment Levet C Trcatment Level A,A•2,B, <br /> C. Depth to Limiting Condition: 2.0 ft <br /> Perwlation tlate �S°rptlon Abwrption <br /> Area Lwding �11Dund Area Loading �"�Ound <br /> D. Percent Land Stope: 3.0 % ��'''� Rac� Abwrpdon Rate �'S°��°" <br /> ���ft1� Ratio (���� Ratio <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 .o, . 1 _ � <br /> F. Mound Absorption Ratio: 2.00 0„°s �.2 1 1.6 , <br /> 0�to 5(tine sand 0.6 2 1 1.6 <br /> Tabl2 I and toam �ne sand) <br /> �AOUND CONTOUR LOADIPIG RATES: s to�s o.�s �.s 1 �.6 <br /> Contour �s to so 0.6 2 0.78 2 <br /> Measured ' Tsz[ure-d?rivcd �oad.�o 3�to-0s o.s 2.a o.�e 2 <br /> Perc Rato �R mound absorption ratio ' <br /> �t°� 46 to 60 0.45 2.6 0.6 2.6 <br /> �h0�1p1 1.0, 1.3.2.0, 2.J. 2.5 <�2 61to 120 • 5 0.3 5.3 <br /> , >i2o - • - - <br /> 61•t 20 mpi oR s.o =t2 kSystems with these values are not Type I systems. <br /> �12o mpi' >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 Loadin�Rate=ftZ <br /> 750 GPD : 1.2 GPD/ft2 = 625 ftZ <br /> If a larger dispersal media area is desired, enter size: 630 ftZ <br /> B. Enter Dispersat Bed Width: 90.0 ft Can not exceed f0 feet <br /> C. Calculate Contour Loading Rate: Bed Width X Design Media Loading Rate <br /> 10 ft2 X �•2 GPD/ft� = 12.0 gal/ft Can not exceed Tabte 1 <br /> D. Calculate Minimum Dispersal Bed Length: Dispersat Bed Area :Bed Width =Bed Length <br /> 630 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 /> 10.0 ft X 2.0 = 20.0 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 /> 20.0 ft - 10.0 ft = 10.0 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 />