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' , MOUND DESIGN WORKSHEET 5 <br /> � <br /> ' ' (For Flows up to 1200 gpd) <br /> A. FLOW Estimatcd Sewagc Flows in Gallons per day <br /> Estimated .�O�gpd Number Type 1 Type II) Type ID Typz <br /> or measured x 1.5 = gpd. °` `v <br /> � <br /> 2 sao zzs iso �, <br /> B. SEPTIC TANK LIQUID VOLUMES a o 330s° zs� °f� <br /> ���� <br /> �000 gallons 6 '9050o su s�z T,,'a,. <br /> 7 1050 600 370 p m <br /> 8 1200 675 408 � <br /> C. SOILS (refer to site evaluation) `°'"�"ss <br /> , �. <br /> 1. Depth to restricting layer = 1�inches /�+� � ���Tank Ca .a���;� w� <br /> feet Liquid capaciry <br /> 2. Depth of percolation tests = /Z inches "°^����� Minimumliyuid Lyuid�aorywi�h �w�,��,& <br /> Bednx�mc Capaciry garDagc d�spvsal lih iosidc <br /> 2�x Iccs 750 1125 1500 <br /> 3. Texture Percolationrate 0�3o mpi �„<< �� ,� 2� <br /> 5 ur e IS00 2250 3000 <br /> 4. Land slope���0 7.R��r Y 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 /> oc� gpd x 0.83 sq. ft./gpd = �odsq. ft. <br /> 2. Select width of rock layer (max 10' if<120 mpi max 5') = I b ft. <br /> 3. Length of rock layer = area_width = , , < a��n�� sa�o ��.�a eo=e� Qo <br /> 9 _o�=o o^o ab.. <br /> Jrbo sq. ft. . �-ft. _ �o ft. -0-:�°°D,��D a ec,�o¢ p . <br /> 4Q'oq op,Aa"n.o oeapqoo . . . <br /> � a oo po poa���aD p=. . <br /> Width �ft a�pDpOD D oD e <br /> <120mpi <10' Length �'a ft <br /> E. ROCK VOLUME <br /> >120mpi <5' <br /> 1. Multiply rock area by rock depth to get cubic feet of rock;S'� sq. ft. x_� <br /> ft. =S�v cu. ft. <br /> 2. Divide cu. ft.by 27 cu. ft./cu. yd. to get cubic yards; <br /> �� cu. ft. =27= 78 cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; Zo cu. yd. x 1.4 <br /> ton/cu. yd. _?�_tons. <br /> F. ABSORPT'ION WIDTH �` Absorption Width Sizing Table <br /> 1. Percolation rate in top 12 inches of soil is �n mpi ��,��,�;� Gallons �o�A�� <br /> Texture �0'�� Minutts per Inch Soil Tezture per day per width to Rock <br /> (MPI) square foot Layer wdth <br /> Fasmr Nan 0.1 Coaru Sand 1.20 1.00 <br /> 0.1 to 5 Smd 1.20 1.00 <br /> 2. Select allowable soil loading rate from table; o.<<o s Fne Sand o.6o Z.00 <br /> 6 to]5 Sandy Loam 0.79 1.52 <br /> ,�� �pd/� 16 to 30 Loam 0. 0 <br /> at' o t t oam 0.50 2.40 <br /> 46 to 60 Clay L.oam 0.45 2.67 <br /> 60 to 120 Clay 0.24 5.00 <br /> 3. Calculate adsorption width ratio by dividing rock layer s�o,��,��zo c�aY o.zo 6.00 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br /> 1.20 gpd/ftz= ,6o gpd/ft2 = 2�00 . <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> Z x /o ft =�o ft <br />