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' MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> A. �Q`/�J Fstimated Sewage Elows in Gallons per day <br /> ( d) <br /> Estimated 7 'J �Cl Nianba i Type 1 Type II Type III Type <br /> or measured - x 1.5 = - gpd. •� �V <br /> 2 3ao zzs iao � <br /> B. SEPTIC TANK LIQUID VOLUMES a 6 o s°s° is6 ofi°� <br /> s �so aso i9a "'�"� <br /> � -)�J� `� 1- /�D:� gallons 1 2•.�D aJa.�I �Lt`n-�'�' L�1��1�``�`�Y 6 900 525 332 in <br /> 7 1050 � 600 370 Type[. <br /> IIa <br /> 8 i 1200 675 408 I m <br /> C. SOILS (refer to site evaluation) e� .�,*;, ' , , r� f� � `°'"t°� <br /> ., <br /> 1. Depth to restricting layer= a�,�.g���� inches feet �ywd���,Y <br /> 2. Depth of percolation tests= /� � inches ��� w��`� `�`�ry� ��'�5��� <br /> Bedmmts Gipawry gatbage dispoaal tih inside <br /> 2�x ka 730 1125 I500 <br /> 3. Texture 1-0�l v� � Percolation rate lo•0 mpi 3,x. �� « 2� <br /> 4. Land slope ,S % 5„�� �5� �0 3� <br /> 7.R or 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 /> � o gpd x 0.83 sq. ft./gpd = a�> sq. ft. <br /> 2. Select width of rock layer (max 10' if<120 mpi max 5') _ /�� ft. <br /> 3. Length of rock layer = area =width= >n:� � � � <br /> ..'a .or�'ne. ^ a <br /> 9 � ' 00♦ o�o�� o . q. <br /> L N�/-� ap0' O q� Q <br /> ��, �.1- Sq. ft. - � ft. = c _lt. a`d.�eeaD�D ape\.,p-Q <br /> QoowQ,aaa A��A .000 p <br /> oo od�PGaDtD nD np; <br /> W1C1�1 '�1L_ft Qa .a a ao ao ooc n �: .e e n �. <br /> <120mpi <10' Length �r. ft <br /> E. ROCK VOLUME <br /> >120mpi <5' <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; ' d� sq. ft. x ),c s� <br /> ft. = l��cu. ft. <br /> 2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br /> ' '� cu. ft. -27 = a u 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. ABSORPTTON WIDTH Absorption WidtL Sizing Table <br /> 1. Percolation rate in top 12 inches of soil is 10.0 mpi �o,m�,�� c�►�� �oofA��, <br /> Texture � L-14����A W�. Minura per[ach Soil Texnue per day per widcb to Rock <br /> (MPq squane faot Layer Width <br /> Fssoer duo 0.I Coarse Sand 1?0 I.00 <br /> 0.1 to 5 Saod I�0 1.00 <br /> 2. Select allowable soil loading rate from table; o.��o s F�s� 0.6o z.00 <br /> 6 co IS Saody L.oam 0.79 1.52 <br /> 16 co 30 Lwm 0.60 2.00 <br /> '--�- �Pd�� 3��oas s�i�� o.so z.ao <br /> 46 ro 60 Clay L.oam 0.45 2.67 <br /> 60 to!20 Clay 0.24 5.00 <br /> 3. Calculate adsorption width ratio by dividing rock layer s�o���zo c��y o.zo 6.00 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br /> 1.20 gpd/ftz= .ys gpd/ft2 = a,c�� <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> a-�x /c� ft =a�.� ft <br />