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MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> A. FLOW Estimated Sewage Flow in Gallons per Day(gpd) <br /> Estimated 7 SD gpd xt o Type r type lr type in Type ry <br /> or measured x 1.5 = - gpd. Bedrooms <br /> 2 300 225 180 hoz <br /> 3 450 300 218 of <br /> B. SEPTIC TANK LIQUID VOLUMES 4 600 375 256the <br /> 5 750 450 lcoD gallons 6 900 525 332 0th. <br /> 7 1050 600 370 <br /> 8 1 1200 1 675 408 <br /> C. SOILS (refer to site evaluation) r _ C 3 Number sN� I� <br /> of [,y.a G-&,Ip <br /> 1. Depth to restricting layer= a4"- Zq inches stems <br /> 2. Depth of percolation tests = j-inches (PLW.•' (PU-) <br /> 3. Percolation rate 1 1 . ! mpi 23 r less ,705000 1.1125 I <br /> 4. Land slope 3 % 5 or 6 1000 2.000 I <br /> 7 or 8 2,000 3.000 <br /> over 9 See fig.C-6 (z 1.5) <br /> D. ROCK LAYER DIMENSIONS I <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock <br /> layer:A x 0.83 = <br /> �_gpd x 0.83 sq. ft./gpd = b�sq. ft-�i t*, -�qNa <br /> 2. Select width of rock layer (10 feet or less) _ 10 ft. <br /> 3. Length of rock layer=area_width = Rock Bed <br /> t,,K L4_sq. ft. ft. t, ft. <br /> 1•ti•ti•tiK•�•ti•ti•�♦•ti•�•�•�•ti•S•� � <br /> !•r•!•!•!•!•r•r•r•!•r•!•!•r•!•r <br /> tiidth 510 ft. <br /> S•ti•S•ti• •ti•ti•ti•tiK•V•t•ti•ti•ti•ti•ti <br /> 1.1•tiK•ti•ti•ti•ti•ti•�•ti•ti•ti•Nti•ti•ti <br /> E. ROCK VOLUME �- Length j <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> sq.ft. x ft. =0j.-IL cu. ft. <br /> 2. Divide cu. ft.by 27 cu. ft./cu. yd. to get cubic yards; <br /> �)I t' cu.ft. i 27=-;0 cu. yd. j <br /> .3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br /> cu. yd. x 1.4 ton/cu. yd. = a tons. <br /> i <br /> i <br /> F. ADSORPTION WIDTH G L01:1*1 <br /> on Width Sirs Table <br /> 1. Percolation rate in top 12 inches of soil is 11, Percolationi d y R& °t <br /> mpi Rase Gtitinutes per;,,., Soil Texturepa.�,:r 1O`f`` <br /> (mpi) t- ab-"M i <br /> 2 Select allowable soil loading rate from table; Faster than 0.1 Coarse Sand 1.20 1.00 <br /> 0.1 to 5 Sand 120 1.00 <br /> • 4 S gpd/ft2 0.1 toy Fine Sand- 0.60 2.00 <br /> 6 to 15 Sandy Loam 0.79 1S2 <br /> 16 to 30 Loam 0.60 2.00 <br /> 3. Calculate adsorption width ratio by dividing rock layer 31 to 45 Silt Loam 0.50 2.40 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; clay_ oam .4 2.67 <br /> 61 t0120 Gay 4 5.00 <br /> 1.20 gpd/ft2?- '14 �' gpd/fF= ;Z-1,? Slower than 120 Clav - - <br /> ••Soil loving 509E or more of faw or very fine sand <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> 0 x_j ft ft <br /> i <br /> I <br /> _ I <br />