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MOUND DESIGN WORKSHEET 5 <br /> (For Flows up to 1200 gpd) <br /> I A. FLOW Estimated Sewage Flows in Gallons per day <br /> (PA) <br /> Estimated 7. 27 gpd Number Type 1 Type II Type m Type <br /> or measured x 1.5 = gpd. 1 IV <br /> 2 300 225 180 60% <br /> B. SEPTIC TANK LIQUID VOLUMES 4 0 3305 2256 of the <br /> values <br /> 72 0 gallons 5 990000 525 29450 °' <br /> 7 1050 600 370 Tp`l. <br /> 8 1200 675 408 m <br /> C. SOILS(refer to site evaluation) ,1/ SonicT,,,Capacities tin canons) <br /> columns <br /> 1. Depth to restricting layer= 0 inches / S feet Liquid capacity <br /> Nuiriber of Minimum <br /> N & <br /> 2. Depth of percolation tests = /Z. inches <br /> Bedrooms Capacity t msyusal un inside <br /> 3. Texture Lo,4rh 2.x toss Iso <br /> Percolation rate Zlv mpi a.n< 1000 1500 I30o tsao 2000 <br /> 5 or 6 1300 2250 3000 <br /> 4. Land slope 3 CYO 7.It or 9 2000 3000 4000 <br /> D. ROCK LAYER DIMENSIONS <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock layer: A x 0.83 = <br /> Its O gpd x 0.83 sq. ft./gpd = G 2S sq. ft. <br /> 2. Select width of rock layer (max 10' if<120 mpi max 5') = /49 ft. <br /> 3. Lenzth of rock layer=area_width = - :;,,,.:7,1.:':,:'.,,,;,:-.: to Ra 4A �:.�:a w �:- a nec <br /> ;.ray ..e.se eqD� a <br /> Z 3 sq. ft. - 10 ft. = !02 ft. ° }4 eoa.aLL . <br /> �Qa.' o.eeP.. A�e�:Ge4donu n°�`• � <br /> CO�°0 o°O Qaia .s- .ee.. V: v e <br /> Qy, .Q:eO �O.'iiAO�III? '(�:�n e:.QA 8 d:0�!�:�QO+:R ; <br /> `L `�c <br /> Width /0 ft 4a° °otiev000a�oa6aDo �e"i.AI, <br /> <120mpi <10' Length G2 ft <br /> E. ROCK VOLUME >120mpi <5' <br /> 1. Multiply rock area by rock depth to get cubic feet of rock;(�ZI sq. ft. x I <br /> ft. .-_ 2..3 cu. ft. <br /> 2. Divide cu. ft.by 27 cu. ft./cu. yd. to get cubic yards; <br /> Z.2fcu. ft. -27= Z I cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; 2-?cu. yd. x 1.4 <br /> ton/cu. yd. = 32 tons. <br /> F. ABSORPTION WIDTH Absorption Width Sizing Table <br /> 1. Percolation rate in top 12 inches of soil is 2 4-mpi Percolation Rate in Gallons Ratio of Absorption <br /> Minutes Inch Soil Texture per day width k <br /> Texture La4#+? perLayer <br /> Faster than 0.1 Coarse Sand 1.20 1.00 <br /> 0.1 to 5 Sand 1.20 1.00 <br /> 2. Select allowable soil loadingrate from table; 0.1 to 5 Fine Sand 0.60 2.00 <br /> 6 to 30 Sandy <br /> LoyLoam 0.79 1.52 am 0.60 2.00 <br /> O gPd/ft2 31 to as sat Loam 030 2.40 <br /> 46 to 60 Clay Loam 0.45 2.67 <br /> 60 to 120 Clay 0.24 5.00 <br /> 3. Calculate adsorption width ratio by dividing rock layer Slower than leo Clay 0.20 6.00 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br /> 1.20 gpd/ft2= 0 gpd/ft2= 7 . <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> 2 x /0 ft= 20 ft <br />