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MOUND DESIGN WORKST;�EET
<br /> � ' (For Flows up to 7.200 gpd)
<br /> �Ae sew.t•Flor+in oiuom pec a
<br /> A. ,['i.+�w �
<br /> M�mEet 'n'Pe 1 '�'Pe ii '�'P�m '1��'
<br /> Estimated �.o $Pd gpd. �
<br /> or measured=---x 1.5 =__.
<br /> 2 xo us ,ao �y,
<br /> � �yo �ao zu �m
<br /> B, SEPTIC TANK LIQtTID VOLUMES 6 '90300 �uJOs rn �
<br /> ►-�?.S� 4� 1—/noc� g�0113 . � 9 toso boo r10 �
<br /> I s I izoo a�s '`°° �m
<br /> C. SOILS (reEer to site evaluatieT) ���y,z�, ,��es=f�t �,� ��,�, �,�„�,,
<br /> ��
<br /> 1. Depth to restricting lay �+-�� ,, �,,,,,,, �, �,,,,,,,,,;r ""M�'°
<br /> 2, Depth of percolation tests � � `� '��_�'� ��� ;�
<br /> �.or�r� Percolation ra /o ,2 mpi '�~ �� ;'� �
<br /> 3. Texture ,'�,;. ;� � .�
<br /> 4, Land slope � %
<br /> D. R K LA ,D �
<br /> �„ Nfa,iitiply flow rate by 0.83 to obtair►requixed area of rock layer. A x 0.83 =
<br /> �vQ„__gpd x 0.83 sq. �t./gpd = ,.L'�'�.sq. h.
<br /> 2. Select width of rock layer (max �0' i#<�20 mpi max 5') _ /=—�. `» ` .M
<br /> 3. Length of rock layer� azea+v�ridtt� _ .,� ' ,�,�'.� ,
<br /> • � �sq. ft. + l=,ft. =�-ft• c. r ''. ��' ,
<br /> �dth .io ft
<br /> � <120mpi <10' �n�-�—ft
<br /> >120mpi �5'
<br /> E. R�JCK VOLUME ���� s ft x i.��
<br /> 1, Multiply rock area by rock depth to�et�bic feet of rock; q�
<br /> ft. =2�.
<br /> 2. Divide cu. ft. by 27 cu. �/�' y 27° ge.'.�t`�bcu.yd�;
<br /> �
<br /> 3. Multiply cubic yards by 1.4 to g�et weigh tons�in tons; �cu• yd. x 1.4
<br /> ton/cu y �.1-
<br /> F. ABSORPTION WIDTH A�eorpdoa VYldtn Sk�T1�1�
<br /> o,u� ��tn�
<br /> 1. Percolation rate in top 12 inches o#soil is /o•9 mPi ���,� �,T��, �� �`5
<br /> Texture ��-fl`� 1..o A-r✓�
<br /> r.w.,m.,a� cA.n.a.sa ��o �.o
<br /> 1.20 1.0
<br /> 0.1 b S F1e�saed 0.60 1C
<br /> 2, Select allowable soil loading rate fzom table; eb,s s•�r� o� i�
<br /> .L.t�i—• SPd/£t� ' ii p� si� oso z�
<br /> 6�o a Im �►� o�.xsi s i
<br /> Sio�et d�12D Qq 0.20 6.�
<br /> 3. Calculate adsorption width ratio by dividing rock layer
<br /> loading rate of 1.20 gpd/h2 by allowable soil loading rate;
<br /> 1.20 gpd/�*��BPd��_ � � •
<br /> 9�. • Multiply adsoxption width zatio by zock layer width to get
<br /> requized adsozption width;�1 X �-� _�h
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