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Minnesota Pollution <br />Control Agency <br />OSTP Mound Design <br />Worksheet > 1 % Slope <br />UNIVERSITY <br />OF MINNESOTA <br />1. SYSTEM SIZING: Project ID: V 06.12.13 <br />A. Design Flow: 750 IGPD TABLEJXa '·, <br />B. Soil Loading Rate : 0.45 IGPD/ft2 <br />> <br />LOADING RATES FOR DETERMINING -BOTTOM ABSORPTION AREA <br />. AND ABSORPTION RATIOS USING PERCC>LATION TESTS <br />C. Depth to Limiting Condition: 1.2 j n <br />Treatment Level -C · · Treatment Level A,-A-2, B, <br />~ · .. , . <br />•' ,_. -Ab sorption · l,'ound -Mound <br />D. Percent Land Slope: 3.0 /f% . Percol~tio~ ·R~te .· .A·Absolrptidoln <br />· .. (MPI) _ . , rea oa_ ng <br />-. ·-· ·-R~t~ 1. <br />1 <br />_ <br />A~(!i L~iiding Absorption Rate ,; Absorptfon <br />· Ratio <br />E. Design Media Loading Rate: 1.2 jGPD/ft2 <br />F. Mound Absorption Ratio: 2.60 I <br />-. Table I.·· ·· -, <br />MOlltW -CONTOUR .LOADltlG RA T-E5 ::· •· -. · <br />· /Ma~u i-<.i d · ,. 1 <br />• t i;,i tur~ ~ di;,ri vi;,d ,. <br />P9rc R:at<.i ; OR · ri1ound ab sorption -.rati o _,. /· : . ' . : ·. ·. <br />~60mpi '-I 1.0, 1.3. 2.0 , 2 .-1. 2.6 <br />contour · <br />-!--oaciing ; <br />·. Rat!'i:·. <br />:.12 <br />-· -. .-(gpd/ft1 ) ... <br /><0.1 - <br />0.1 lo5 1.2 <br />0.1 lo 5 (line sand 0 .6 and loamt fine sand) <br />6to 15 0.78 <br />16 to 30 0,6 <br />31 to 45 0.6 <br />46 to 60 0.46 <br />61 to 120 . <br />>120 - <br />1 <br />•• (gpd/~1 <br />) :, <br />·. ~•Ito <br />.. <br />1 . 1 <br />1 1 .6 1 <br />2 1 1.6 <br />1.5 1 1 .6 <br />2 0 .78 2 <br />2.4 0 .78 2 <br />2.6 0.6 2 .6 <br />6 0 .3 5.3 <br />-- <br />61-120 mpi OR 5.0 <br />*Systems with these values are not Type I systems. <br />z. 120 mpi' ,s .o· 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 = ft2 <br />I 7so jGPD + I 1.2 IGPD/ft2 = I 625 jn2 <br />If a larger dispersal media area is desired, enter size:j 630 jtt2 <br />B. Enter Dispersal Bed Width: I 10.0 jtt Can not exceed 10 feet <br />C. Calculate Contour Loading Rate: Bed Width X Design Media Loading Rate <br />I 10 jtt2 XI 1.2 jGPD/ft2 = I 12.0 lgal/ft Can not exceed Tab (V ------D. Calculate Minimum Dispersal Bed Length: Dispersal Bed Area + Bed Width = Bed Length <br />. I 630 ltt2 <br />.,. 1 10.0 1ft =I 63.o 13/ <br />3. ABSORPTION AREA SIZING <br />A. Calculate Absorption Width: Bed Width X Mound Absorption Ratio = Absorption Width I 10.0 ltt x I 2.6 I = I 26.o In <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 />1 26.o 1ft . 1 10.0 In = ..... I -16-.o---.lft <br />4. DISTRIBUTION MEDIA: ROCK <br />A. Media Volume: Media Depth X Length X Width <br />1.00 I ft XI 63.o In x I 10.0 ltt = 1 630 1 ft3 .,. 27 = 1 23 <br />: