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MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> A. FLOW Estimated Sewage Flow in Gallons pec Day(gpd) <br /> Estimated 2_,"O gpd Nu nber <br /> or measured - x 1.5 = gpd. Bedrofoms Type I �'pe lI iype III 'Iype IV <br /> 2 300 225 180 sox <br /> of <br /> B. SEPTIC TANK LIQUID VOLUMES 4 6 0 375 256the <br /> 5 750 450 294 <br /> `b I-I o o D gallons 6 900 525 332 the <br /> 7 1050 600 370 6" <br /> 8 1200 675 1 408 <br /> C. SOILS (refer to site evaluation) y , SA,a (gra Number <br /> camy <br /> 1. Depth to restricting layer in a t," inches Bedoms C."_y , <br /> 2. Depth of percolation tests = 1 inches `A"" <br /> 3. Percolation rate '8' 1 m i 2o<� 7500 0 1.1254. Land slope % p 35 orb 1_°W =0 <br /> 7 or 8 2.000 3.000 <br /> over 9 See fig.C-6 (x 15) <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 = , <br /> '15y gpd x 0.83 sq. ft./gpd = (,aa. sq, ft-tio%= 1oi�4a <br /> 2. Select width of rock layer (10 feet or less) _ /0 ft. <br /> 3. Length of rock layer= area_width = Rock Bed <br /> 1,cl L4_sq. ft. I)ft. ft. �.,.�...,.,.,.,.��.*.ti.,.�.,.. <br /> r•!•r•r•r•r•r•r•S•r•r•r•r•r•r•. . . . . . . . . . . <br /> {fti ti:{=ti:{fes:{:tiftiti ti tif�ti�ti ti idth :510 ft. <br /> • • • • • • • • • • • <br /> !•!•!•!•!•r•r•r•r•!•r•r•I•!•!•!• <br /> tiM•1•\ S\ tib•.�titi •♦ <br /> •1•!.!•r•r•r•r•r•!•r•r•r•r•r•r•r• <br /> E. ROCK VOLUME ~- Length <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> 4t�sq.ft. x Lg:!L ft. =2Le cu. ft. <br /> 2. Divide cu.ft. by 27 cu. ft./cu. yd. to get cubic yards; <br /> 0)Y cu.ft. i 27= a. 7 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. _ -2 �' tons. <br /> F. ADSORPTION WIDTH (_L_A`- LOO V\ A width Sita Table <br /> 1. Percolation rate in top 12 inches of soil is CA Fa.e.d <br /> Minutes inch Soil Texture PV" i 1°`ti°ed <br /> Per pe.y�.. eche <br /> (mpi) tee •- <br /> 2. Select allowable soil loading rate from table; Faster than 0.1 Coarse sand 1.20 1.00 <br /> .y ! ' gpd/ft2 0.1 toy Sand 1.20 1.00 <br /> 0.1 to 5 Fine Sand- 0.60 2.00 <br /> 6 to IS Sandy Loam 0.79 1a2 <br /> 3. Calculate adsorption width ratio b dividing rock laver 16 to 3o Loam 0.60 2.00 <br /> � 5' g 31 to 45 Si1t.Loam 2.40 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate, -A6.to 60------ clav Loam 2-67 <br /> 61 12 -05W- <br /> 1.20 gpd/ft2-L�!gpd/fF= z) , (a 0 Slowert0than 120 Clav -- 3.00 <br /> -Sod having 50%or more of fine or very fine sand. <br /> 4. Multiply adsorption width ratio by rock laver width to get <br /> required adsorption width; <br /> a. 0 ft L. r) ft <br />