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MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> 1 ' I ' Estimued Sewaae F1ows in Galloas per dsy <br /> A. FLOW � e <br /> Estimated o o gpd r� �r,�, �tyan r,�m � <br /> or measured - x 1.5 = - gpd. °� <br /> z 30o ns iso �, <br /> B. SEPTIC TANK LIQUID VOLUMES 4 � � Z� �� <br /> s �w aso na ;� <br /> a-�c�o c7 allons e 90o sis s3s r,,�i. <br /> g ! � ioso 600 3�o u« <br /> j 8 i IZ00 675 I 408 m <br /> C. SOILS (refer to site evaluation) �� <br /> � � � <br /> 1. Depth to restricting layer=a?,_inches - feet ����r <br /> � �� �"� ""� <br /> 2. Depth of percolation tests = � a inches "°`°�°` <br /> :�x w. �w uas �soo <br /> 3. Texture ��-�� 1-��� Percolation rate�2,�'_mpi s,K• �� �� � <br /> O/Q 73R�r Y M00 �000 � <br /> 4. Land slope - ""°° <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 o gpd x 0.83 sq. ft./gpd = ��sq. ft. <br /> 2. Select width of rock layer (max 10' if<120 mpi max 5') = 1 o ft. <br /> 3. Length of rock layer= area+width= � -�-��� �� k�-�-���-�-X-� . <br /> �.�artr� •°�+.�..:. ; .... . �,.�e.,�, - � <br /> y g� s . ft. + �o ft. _���• -�'��►,a:�o�.:� <br /> M '�'tLSV.irM'�:4.�:. <br /> q a�r�:. .. . . . ' . <br /> w • •�.�. ..a .�,, <br /> • . . ... > .. .. ... � <br /> i: <br /> W1dLt1 /0 fL � <br /> <120mpi <10' Length sc� ft <br /> E. ROQC VOLUME >120mpi <5' <br /> 1. Multiply rock area by rock depth to get cubic feet of rock;�sq. ft. x�� <br /> ft. _,,�3 cu. ft. <br /> 2. Divide cu. ft.by 27 cu. ft./cu. yd. to get cubic yards; <br /> S�cu. ft. s 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. ABSORPTION WIDTH ��rero�wiae�s��� <br /> 1. Percolation rate in top 12 inches of soil is �►.S mpi �.�,�� c�.u� w��r� <br /> Cl��-� Ln�r wl M�o�pec�xe sa�racaR �ro�a �ya vr� <br /> Texture P� <br /> Faseer�hw 0.1 Comae Saod 1.20 1.00 <br /> 0.1 ro S Saod 1:?0 1.00 <br /> 2. Select allowable soil loadin rate from table; o.►w s F��s�a o.�o z.00 <br /> 8 s�,s s�� 0.�9 i.sx <br /> . �i S p�d/ft� ' �a�so � 0.6o z.00 <br /> Cr 31 ro 45 Sih L,aam 030 2.40 <br /> 46 ro 60 pay Lwm 0.45 2.67 <br /> 60 m IZO Clay 0.24 5.00 <br /> 3. Calculate adsorption width ratio by dividing rock layer S'°""'�ai120 � o.zo e.00 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br /> 1.20 gpd/ft2+ .��S gpd/ft2= �•�� <br /> 4. � Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> '�,b7 x�ft= a�.� ft <br />