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MOUND DESIGN WORKSHEET <br /> o (For Flows up to 1200 gpd) <br /> M •A. FLOW tistimated Sewage`&lorw�s In Gallons per day <br /> Estimated `o o gpd (seepages D-7 ori I-3,4,5) <br /> or ., I �1 In <br /> v <br /> or measured gpd x 1.5 � <br /> = i, ,t,o,t,s <br /> 2 :300 .225 ISO <br /> B. SEPTIC TANK LIQUID VOLUMES 3 Oso 300 218 <br /> _-zv 6b allons'(see pages C-3 or -5) 4 � 373 236 <br /> •.lw <br /> 3 730 430 25w n <br /> g P g 6 .900 szs 332 <br /> 7 A050 6a, :370 to <br /> C. SOILS (refer to site evaluation) e. '• 12M 075 40e , <br /> 1. Depth to restricting layer= 14+46 ay inches <br /> umt,n of Minimrm U�id tjquid�y...y.,u <br /> 2. Depth of percolation tests <br /> inches t am,. c,>reky z e:a <br /> 3. Percolation rate mpi„ 3o SM W;u_ 75001Y <br /> 4 nt 6 1S1tU 12250 <br /> 4. Land slope % ;E dz tc1 " 7,It«9 xlY, xw <br /> aet 9 »» <br /> D. ROCK LAYER DIMENSIONS. <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock - <br /> layer, Deily Flow Xi 0.91 :- <br /> 4,oy gpd x 0.83 sq. ft./gpd = • <br /> 2. Select width of rock layer (10 feet or less) _ lo ft. <br /> 3. Length of rock layer = Area+ Width = <br /> s� 7 sq. ft.+ )u ft. = S5 ft. Rock Bed <br /> r;f,'.•fir;.••'� r r;.•:r r�r r r•:T <br /> f;: :j:f:.+�: ;f•f.�tifti`}`�;rl%Idth SION <br /> E. ROCK VOLUMELengt::r:,:;;:r:r• gt `:: :•:;; l <br /> F-- h• <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> sem-sq. ft. x l US ft. =s � cu. ft. <br /> 2. Divide cu. ft.by 27 cu. ft./cu. yd. to get cubic yards; <br /> s,),cu.-ft. +27= Ate_cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight-of rock in tons; <br /> a i cu, yd. x 1.4 ton/cu. yd-. _ tons. <br /> F. ADSORPTION WIDTH <br /> 1. Percolation rate in top 12 inches of soilis G,.S mpi Absorption YAdth Slziny.7bble <br /> i•ercolatlon Rate Gallons Ratio of <br /> 2. Select allowable soil loading rate from table on page E; inMinutetpa SoilYimwe per day per Absorptanwhhh <br /> -��-- gPd/f Inch(MPI) squats font to R0N Lays <br /> 3. Calculate adsorption width ratio by div ding rock layer F&4wdaut0.1• Coarse Sand <br /> 0.1 tr 5 swul 1.20 1.00 <br /> loading rate of 1.20 gpd/f 6 by allowabl soil loading rate; 0.1 r.�•• Fine sans•• 0.60 2.M <br /> 6--.13 Stualy two 0.79 1.32 <br /> 1.20 gpd/ft2+ ,y r gpd/ft2= fata3o . L=m 0.60 2.00 <br /> 31 1043 Slit Loam_ 0 SO 2.40 <br /> Check this value on page E-1 5. C46'1060-1 -Clay latvn OAS 2.67 . <br /> 60 to 1'tl _ Of - 0.24 S.W <br /> 4. Multiply adsorption width ratio by rock layer width to get Slowc;; <br />