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' ' MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> A. �.OW Estirnued Se�va6e Flow�in Galloas pa Day(gp� - <br /> Estimated �5O gpd N�+� <br /> of lype 1 'Iype II 'iype JIl 7ype IV <br /> or measured - x 1.5 = � gpd. a��� <br /> 2 300 225 160 6os <br /> 3 �SO 300 218 •t <br /> B. SEPTTC TANK LIQLJID VOLLTMES � 4 � 3�s zs� '� <br /> 5 750 450 294 ��'u <br /> �-�a�(� '�f �-/D[9C� g�0I1S 6 400 525 332 '�'° <br /> 7 1Q50 600 370 ,d� <br /> 8 1200 675 408 <br /> C. SOIIS (refer to site evaluation) N�� � � <br /> 1. Depth to restricting layer= �,y'�- a��� inches B °� �� �,� <br /> 2. Depth of percoladon tests = 1 a '' inches `p"'' `''�'' <br /> 3. Percolation rate 1 i•� mpi 2°```s 750 '."� <br /> �«4 i.000 �.soo <br /> 4. Land slope C� % s«b i.soo z.uo <br /> �a e z000 s.000 <br /> over 9 See fig.C-6 (s 15) <br /> D. ROCK LAYER DIIv�1SIONS <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock <br /> layer:A x 0.83 = , <br /> �5� . gpd x 0.83 sq. ft./gpd = �a�. sq. ft.+,o�o = ��sy° <br /> 2. Select width of rock layer (10 feet or less) _ �c� ft. <br /> 3. Length of rock layer = azea y width = Rock Bed. <br /> �_.Sq. ll. "f' ���lt. =��_1 t. ti�1 f���f�fti�ti`1�ti�ti�ti�ti��fti���\�ti <br /> ti•1•�•ti•�.�•ti•'t.�.ti.ti•ti.ti•ti.ti•ti•ti <br /> r•r.f.f•r•r.r•r•r r•r•r.r.r.r•r• �dth 510 ft. <br /> �•ti•ti•ti•�•ti•ti•ti•ti•ti•ti•ti•ti•ti•�•ti•ti <br /> t•f•t•l•1•t•t•t•l•�•r•t•1•t•r•r• <br /> ;•�•ti•ti•�•ti•ti•1•1•ti•ti•`•ti•ti•1•�•1 <br /> •1•l.t•J•t•1.t.t•l•t•�.t.t.l.r.l• ., <br /> E. ROCK VOLUME ~- I'�'�' --' <br /> 1. Multiply rock azea by rock depth to get cubic feet of rock; �� <br /> �sq.ft. x i.�s ft. _�cu. 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 yazds by 1.4 to get weight of rock in tons; <br /> �cu. yd.x 1.4 ton/cu. yd. _� tons. <br /> F. ADSORPIZON WIDTH L�r-�`-c L o�w, <br /> Ab on 1V�dth Si� Lble <br /> 1. Percolation rate in top 12 inches of soil is I I.s mpi Pe,coLtlonR,ee G°� ��°°°' <br /> M�m�;�, Soil Texture �,q"„'��', �,°cd <br /> �.4 .�a, <br /> 2. Select allowable soil loading rate from table; Faster than 0.1 oarse Sand 1.20 l.00 <br /> d�ft2 0.1 to5 Sand 1.20 1.00 <br /> ,`{S � 0.1 to 5 Fine Sand" �•� 2•� <br /> 6 to 15 ndy Loam 0.79 1�2 <br /> 3. Calculate adso hon width ratio b dividin rock la er 16 co�o t,o�, o.bo 2.00 <br /> rP � Y g Y 31 to 45 s�ic�m osa z.ao <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; ��o bo c�a �.o�.�, o.as z.b� <br /> 1.20 gpd/ft�i .�gpd/ft� _ �.�.� Slowerthan 120 ciay o�a s.00 <br /> "Soil h�ving SQ9L or mae d fux or vey fux aand <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> �.�2 x_�ft= a�,� ft <br />