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MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> Floured SCVMI Am a In(MM per di; <br /> A. FLOW T25%6 ,11m Estimated L D gpd r�+� 7'p1 �A or measured =_x 1.5gpd• 50 NoB. SEPTIC TANK LIQUID VOLUMESs 30 4"a.-/OocD gallons 17 1� 66009 1200 67S <br /> C. SOILS (refer to site evaluation) ohm <br /> 1. Depth to restricting layer of.►1, "eao"inches ..feet <br /> e.a...r <br /> 2. Depth of percolation tests= = --inches ,;, ,,,, Ism <br /> 3. Texture ��a-Y►'i Percolation rate_�_.�___ml <br /> 7,U M Y 1000 )000 X000 <br /> 4. Land slope <br /> D. ROCK LAYER DRAENSICANS, <br /> e <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock lar.A x 0.83 = <br /> .�-gpd x 0.83 sq. ft./gpd = ..3 7 3 sq. ft. o <br /> 2 Select width of rock layer(max 10' if<120 mpi max 5') <br /> 3. Length of rock layer= area+width= <br /> � w <br /> Width 0 ft <br /> <120mpi <10' Lente= --� <br /> >120mpi <5 <br /> E. ROCK VOLUME <br /> 1. Multiply rock area.by rock depth to.get cubic feet of rock; 4)0.sq. ft x x-22 ' <br /> ft._ '" _ocu.ft. <br /> 2. Divide cu. ft.by 27 cu. ft./cu.yd.to get cubic yards; <br /> cu.ft. +27= _ 1, cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; 16 cu. yd. x 1.4 <br /> ton/cu.yd. _.a3 tons. <br /> F. ABSORPTION WIDTH Aboapdoe WIdlh Shdat Table <br /> 1. Percolation rate in top 12 inches of soil is y, mpi 1 Abw <br /> ei SdI,mwm 17 �,; <br /> Texture t-� �o c F" Kort(' LOW WW <br /> Parer 0,1 em"Sad 1.20 1.00 <br /> 0.1 to S Sad 1.20 1.00 <br /> .2. Select allowable soil loading rate from table; b p 13 Sadr Leapps Momg 0.60 X00 <br /> rn 0.79 1.32 <br /> gpd/ft= 31 a4! s1 0.60 M i40 <br /> 46 a 60 Q+�_I,oes OAS 2.67 <br /> 00*120 <br /> width ratio b dividing rock layer Izo c>•r o o a:a00o <br /> 3. Calculate adsorption Y <br /> loading rate of12QgpdZftZby.Allowable soil loading rate; <br /> 1�20. d/ft2+-i4s, Of . <br /> 4. Multiply.,adsorption width;ratio by rock.layer width to get <br /> required adsorption width; <br /> :r�r) x..Ls2_ <br />