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, ` MOUND DESIGN WORKSHEET 5 <br /> (For Flows up to 1200 gpd) <br /> A. FLOW Fstimated Sewage Flows in G�Ilons per day <br /> Estimated <S O �d N�mber T�� T�n� T�m T� <br /> or measured x 1.5 = gpd. °`� <br /> z soo 2u i so � <br /> B. SEPTIC TANK LIQUID VOLUMES a o 3300s z'sb °f� <br /> Z Z.�O gallons 6 '90�o su s�z �,. <br /> 7 1050 60D 370 ll a <br /> 8 1200 675 408 � <br /> C. SOILS (refer to site evaluation) p �/ `°�"�"`u <br /> 4 Sc lic Tan{c G auti s fin aLunsl <br /> 1. Depth to restricting layer = �U inches � feet �qwd�,��,Y <br /> NutMcr nf Minimum I�yuid liyuid ta�aory wiN with dispos:J& <br /> 2. Depth of percolation tests - � 2. 1riC�leS Bednx>"� c��'�"y s'��g°°'�P""' ''h'�;°° <br /> 2�M lus 750 1125 1500 <br /> 3. Texture Percolation rate�--3U mpi ���<< �� �5� 2� <br /> 5 ur6 I500 2250 3000 <br /> 4. Land slope 2 -..�% �.R�.�y Z� 3� ^°� <br /> A1��:�G ��� �o <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 /> � -.�t� gpd x 0.83 sq. ft./gpd = Z� sq. ft. <br /> 2. Select width of rock layer (max 10' if<120 mpi max 5') _ /d ft. <br /> 3. Length of rock layer = area-width = � a=�n�� a��o �e�a �eOtl� ao � <br /> o.;oc o e qo 000�e DD <br /> �Z Z sq. ft. - �ft. _�ft. a:�o°Db'�A,ao;C�oa o <br /> qA��dod.:qa:no c<o.a c . <br /> �o PD'-�'D'aDDD-�DD' <br /> 9b <br /> Wldl.11 G� ft 4o'o�w�:o�o �o"�aD�QD'ODD ��D ��oc �oDD�� <br /> <120mpi <10' Length G,Z ft <br /> E. ROCK VOLUME <br /> >120mpi <5' <br /> 1. Multiply rock area by rock depth to get cubic feet of rock;�ZZ sq. ft. x / <br /> ft. _�Zcu. ft. <br /> 2. Divide cu. ft.by 27 cu. ft./cu. yd. to get cubic yards; <br /> �cu. ft. -27 = ��cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; ��cu. yd. x 1.4 <br /> ton/cu. yd. _�tons. <br /> F. ABSORI'TTON WIDTH Absorption Width Sizing Table <br /> l. Percolation rate in top 12 inches of soil is�. �� mpi ��,���� Gallons RatioofAbsarpcon <br /> Minutes per inc6 Soil Texture per day per wid[h to Rock <br /> Texture �� (MPI) squaze foot layer�Ydtb <br /> Fazter[han 0.I Coarse Sand 110 I.00 <br /> 0.1 to 5 Sand 1.20 1.00 <br /> 2. Select allowable soil loadin rate from table; o.►�o s Fne Sand o.6o z.00 <br /> � g b�o u s� �� <br /> G> �2 16 to 30 Loam 0.60 • 2.00 � <br /> ! ��/11- 31 to45 SiltLoam <br /> 46 ro 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 s�o,�w��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= (i '� gpd/ftz= ,�'• �� <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> �_x�_ ft - 2 0 ft <br />