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MOUND DESIGN WORKSHEET <br /> _ � , <br /> (For Flows up to 1200 gpd) <br /> A. -�,�W Estlrnued Scw�ge Flows in Gallons per d <br /> - Estimated �1S c� gpd r� ��rya, �n T,�m ,� <br /> or measured -- x 1.5 = — gpd. <br /> 2 300 2?S 180 � <br /> B. SEPTIC TANK LIQUID VOLUMES s � 4� � °f� <br /> �� <br /> gallons 6 900 325 332 T� <br /> • � � ioso 60o s�o u a <br /> � 8 � 1200 675 408 ID <br /> C. SOTLS (refer to site evaluation) � ' `°`"'° <br /> J.. Depth to restricting layer= '�ao � ' inches --- feet �e7a�`` ` '"`�� �,W,� <br /> 2. Depth of percolation tests = 1 � ` inches ��� '�d� <br /> � Bedn"�u GP�kI' [du9oW �Ilhie�ilde <br /> 3. Texture �-a�v✓� Percolation rate y• 2"'�` "° "� '3°° <br /> �._mpi ��K. �000 isoo moo <br /> 4. Land slope �1 . % s'"� �s°° �'° '°°° <br /> 7.6�K Y 2000 )000 W W <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 /> y � gpd x 0.83 sq. ft./gpd = 3�z sq. ft.-�,o�o=��,��, <br /> 2. Select width of rock layer (max 10' if <120 mpi max 5') _ � o ft. <br /> 3. Length of rock layer= area +width = :.. � .�.�.. . ..:. ..�;.:,:. 4 <br /> 4»''�°•.'.:,'°,';�''»:'.. . i.. �. <br /> " �I) � sq. ft. -�- i� ft. _ � I ft. «.,�7�:,��a::e�t�;° � - =��`���. �:. <br /> r»�.r�.�.�w.�:4,i. . <br /> �'�•�Q��•'qr•O 4 P P. .:.��•� ._�Y': <br /> 1l>" �r��4 <br /> Width �_ft a� . .. ., p'ti: . : s :. <br /> <120mpi <10' Length�_ft <br /> E. ROCK VOLUME <br /> >120mpi <5' <br /> 1. Multiply rock area by rock depth to get cubic feet of rock;�sq. ft. x i.�_�� <br /> ft. = y 3c� cu. ft. <br /> 2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br /> 3 o 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. A.BSORPTTON WIDTH, Absorpdon Width Sizing Table <br /> 1. PercolaHon rate in top 12 inches of soil is �-+�a mpi Pucola000,taee;� c�l,00s woaor,,e�«po, <br /> Minutes per(ocA Soil Tncaus per day ptt wldth�o Roek <br /> Texture LL f�`-Z �c,,a-w� cM�� ,��r�« �Ya w;am <br /> Fu��o,i c�s,aa i.zo i.00 <br /> o.i�os s�e i.�o i.00 <br /> 2. Select allowable soil loading rate from table; o.��o s F�s�„e o.�o Z.00 <br /> � ,/ �d/� 6�013 SaadyLoam 0.79 1.52 <br /> � 31 to 43 Sllt laam 0 0 2.� <br /> • 46 ro 60 pay Lo�m 0,43 2.67 <br /> 60 to 120 Clay O.ZA 5.00 <br /> 3. Calculate adsorption width ratio by dividing rock layer s���,,zo cur o.zo 6.00 <br /> loading rate of 1.20 gpd/fk2 by allowable soil loading rate; <br /> 1.20 gpd/ft�+ ,� gpd/:ft� _ �-c� � <br /> 4. • Multiply adsorption width ratio by zock layer width to get <br /> required adsorption width; <br /> a.�� x14_ft = �ft , <br /> - � , <br /> �� _ :: ;,, t,; ,;, <br />