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MOUND DESIGN WORKSHEET <br /> � � (For Flows up to 1200 gpd) <br /> A. �.OW Estimued Sewage Elow in Gallans pa DaY(gpd) <br /> Estimated y�� gpd N'o� �ya I Ty�II 7ype III �y�rv <br /> or measured -� x 1.5 = �' gpd. B�°°n" <br /> 2 300 225 180 so�. <br /> 3 450 300 218 et <br /> B. SEPTIC TANK LIQUID VOLIJMES a boo 3�s a.w '�` <br /> 5 7S0 450 294 ��n� <br /> � -��� � 3llOIl5 � <br /> g 7 t�aso � 3io "a"• <br /> �� <br /> 8 1200 675 408 <br /> C. SOIIS(refer to site evaluation) ,� ,� N,�� �� �,,,�„ <br /> 1. Depth to restricting layer= 1(� �fo ao inches B�,� �,.,,, � <br /> 2. Depth of percolation tests = 1 a'' inches `"�'' ``�' <br /> v mPi z�� �so �.�zs <br /> 3. Percolation rate saa �.000 �.soo <br /> 4. Land slope � % s a 6 �.soo s.aso <br /> �a s �,000 3.aoo <br /> , ovc 9 See[g.C-6 (x 1.5) <br /> D. ROCK LAYER DIIv�TTSIONS <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock <br /> layer:A x 0.83 = ' <br /> N Sv gpd x 0.83 sq. ft./gpd = 373 sq. ft:tJn�=`i�o� <br /> 2. Select width of rock layer (10 feet or less) _ /� ft. <br /> 3. Length of rock layer = area=width = Rock Bed <br /> I � sq. ft.�- �ft. = i-1 I ft. �.ti.�.�.rn'�,�..�.�...�.;.,.,.ti <br /> t.l.I•J•l•f•r•J.�•l.t.I•l l•J•l• <br /> ti.ti.�•�•�ti•ti•��•ti.ti•ti•�ti•�•ti.� idth <_10 ft. <br /> J.1•f•t.l•I•f•1•J f•f•f•f•1•d•f• <br /> . �•1•ti•��ti•ti•�•ti•ti•ti•ti'�•ti•ti•'�•ti•ti <br /> . f�l�f�r•�•l•f•f•r•t•�'•t•l•d•r•f• <br /> ti.ti.�.ti.ti•�.ti.ti.ti.�•�•ti•�•ti•ti•1•1 <br /> �f�f�f,r�f.f.r.f.r.J.t•t•r.f.f.�. <br /> E. ROCK VOLUME ►--- I.ength --� <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> 4�sq. ft. x .�.0 ft. _�cu.ft. <br /> 2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br /> �O cu. ft. 127=�l. 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. ADSORI''TION WIDTH L LA�-( L�p Y►'� A a,w�a�,s� Table <br /> 1. Percolation rate in to 12 inches of soil is�mpi Percolatia�+RaEr p�ve.�y �� <br /> P N;nute,per�„c�, Soil Texture �,9,,.� ,.,,ed,` <br /> (mpD tQ. .�a. <br /> 2. Select allowable soil loading rate from table; Faster than 0.1 oarse sana i.2o i.00 <br /> ,�-! S� d/f t'- 0.1 to 5 Sand 1.20 1.00 <br /> $� 0.1 to� Finc Sand" 0.60 2.00 <br /> 6 to 15 ndy Loam �•i9 1S2 <br /> 0.60 2.00 <br /> 16 to 30 Loam 0.50 2.40 <br /> 3. Calculate adsorption width rario by dividing rock layer 3t co as Silt Loam <br /> loadin rate of 1.20 d/ft2 by allo�vable soil loading rate; �to bo cia�t,o�, o•�� 2.6� <br /> y 0.24 �.00 <br /> 20 gpd/ft�y ,�4 � gpd/ft� _ �..lc 7 Stowerthan 120 Clav -- - <br /> "Soi!naving�09L or more af fir+e or vay fine sand <br /> 4. Multiply adsorption width ratio bv rock layer�vidth to get <br /> required adsorption width; <br /> �2x1,v ft =��•� ft <br />