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MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> A. FLOW Estimated Sewage now in Gallons per Day(Vd) <br /> Estimated 7 SD gpd number <br /> or measured x 1.5= - gpd. �°c*m, 1 It Iype ttt type Iv <br /> 3 450 300 218 as <br /> B. SEPTIC TANK LIQUID VOLUMES 4 6W 375 2% •� <br /> 5 750 450 294 m <br /> a (b /ava gallons 600 � 332 <br /> 9 1200 675 409 <br /> C. SOILS(refer to site evaluation) �l t 1 - �.� 3 Numbsemr <br /> er <br /> 1. Depth to restricting layer= 14 - 316 inches sOf <br /> 2. Depth of percolation tests= j 2 inches <br /> 3. Percolation rate 11. 1 mpi 20=lm ;50 ;� <br /> 4. Land slope 3 % 7 o s 12.000 3•� <br /> ova 9 See 4 C-6 (11-5) <br /> D. ROCK LAYER DIMENSIONS <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock <br /> layer:A x 0.83 = I <br /> 7 0 gpd x 0.83 sq.ft./gpd = 6;k-:), sq. ft+►o90 ° <br /> 2. Select width of rock layer(10 feet or less) = )Q ft. <br /> 3. Length of rock layer=area width= Rock lied <br /> &q 4_sq. ft.+ o . ft. = Le�_ft. �...�...�.ti.,•ti.ti ti.�•�•..�•..�•. <br /> J•J•J•J•J•J•J•I•I•I•J•J•J•J•J•J• <br /> •J•J•I•J•J•J•hJ•IN•J•J•J•J•I•J• <br /> ♦•b�•�.ti•ti•ti•�•M\.M�.ti.ti.�.�.� tdth :510 ft. <br /> hJ•hINN•J•I•J hJ•I•J•hhJ• <br /> •I•JN•hJN•J•J•J•I•JNN.J•J•J• <br /> E. ROCK VOLUME Length -� <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> 4Sd4 sq.ft.xLgIT ft. _JL� cu.ft. <br /> 2. Divide cu.ft.by 27 cu. ft./cu. yd. to get cubic yards; <br /> 'jV cu.ft. f 27= 2 07 cu.yd. <br /> .3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br /> cu.yd.x 1.4 ton/cu.yd. =,3 ,tons. <br /> F. ADSORPTION WIDTH G LD �1 MwrpbonWudthsian nb,e <br /> 1. Percolation rate in top 12 inches of soil is.11,I mpi Pe+colationRaw CAD-- 1...4d <br /> Minu m�tKh Soil Texture �.,,R d'` <br /> r.. d*= <br /> 2. Select allowable soil loading rate from table; Faster than 0.1 parse Sand 120 1...0d0eh <br /> 0.1 to 5 Sand 120 1.00 <br /> • 4 S gpd/ftz 0.1 toy Rine Sand- 0.60 2.00 <br /> 6 to 15 Sandy Loam 0.79 132 <br /> 3. Calculate adsorption width ratio by roca layer 16 to loam 0.60 2.00 <br /> � �hh y dividing k l 45�' 31 to 45 Silt Loam 0.50 2.40 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; c�a . aam 2.67 <br /> 1.20 gpd/ft2+ r145' gpd/ft2= �•L 7 Slower than 120 Clav -4 -� <br /> ..Soil having 5091 or more at fine or very fix xnd. <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> P,62x_1ft= ft <br />