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MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> r i <br /> A. FLOW Fstimated Seaage Flow in Gallons pa DaY(8Pd) <br /> Estimated�gpd x,a,;� <br /> or measured - x 1.5= - gpd. ��� �J 'IYa�n �'Pe III �rv <br /> 2 300 21S 180 so� <br /> B. SEPTIC TANK LIQUID VOLUMES � a 6 0 3�°5° is� �� <br /> I-1 aSo �- 1- I oo� gallons 6 � sa�s 3i � <br /> . � ia�o boo s�o �,:m„ <br /> $ 1200 675 408 <br /> C. SOILS(refer to site evaluation) N� � � <br /> 1. Depth to restricting layer= �y'�-�o a s���inches � �'�-;"t �"."'• <br /> B`m°°� � � <br /> 2. Depth of permlation tests = 1 a'' inches <br /> 3. Percolation rate • mpi z3 a`a` l�o�oo i.,� <br /> 4. Land slope (o % ��8 � � <br /> . orQ 9 s«r�.c-� �x is� <br /> D. ROCK LAYER DIl1��TSIONS <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock <br /> . layer:A x 0.83 = <br /> Z_gpd x 0.83 sq.ft./gpd =��a sq. ft.-���o��s�ha� <br /> 2. Select width of rock layer(10 feet or less) _ /o ft. <br /> 3. Length of rock layer=area-:-width = R�� <br /> -'- = l„S� <br /> _�y�sq. . �ft. ft. �.�.ti,.�.ti.�.-�,.�.�.,,�,, �,ti <br /> f•J•!•f•J•t.f.r.1•f.f.f.f.f,f.f. <br /> ti•\•ti•tiK•t•ti•ti•Mti•ti•ti•ti.ti.ti.ti.ti � <br /> ti���ti SK�tfWf�rti:tiK�Lfti:tirtiftif~ tdth 510 ft. � <br /> ' J•l•tN•l.t•t•t•f t•f•t•t•r•r•f• <br /> ti•t•1•tiK•ti.Mti•ti.ti.ti.�•ti•t•ti•ti.1 <br /> •l.t•!•�.1•t•t.l.r•t•r.f.r.r.r•r• <br /> E. ROCK VOLUME � [.ength --+ <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> 1�.�sq.ft. x .o � ft. _ ��� cu.ft. <br /> 2. Divide cu.ft.by 27 cu.ft./cu.yd. to get cubic yards; <br /> 2�cu.ft. i 27=_�cu. yd. . <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br /> _a2 cu. yd.x 1.4 ton/cu.yd. _�tons. <br /> F. ADSORPTTON WIDTH G Lla'� Lnq wl n� oa;w�a�,s�, rab� <br /> 1. Percolation rate in top 12 inches of soil is mpi C+�ae A.uod <br /> Peeca�tianRaee pea.y �erteee <br /> Mu,,,��;Kt, Soil Texture �� ,,,;,d,� <br /> 2. Select allowable soil loadin rate from table; � <br /> g Faster than 0.1 oarse Sand 120 1.00 <br /> ,y { gpd/f�Z 0.1 to� Sand 1.20 1.00 <br /> 0.1 to b Fine Sand" 0.60 2.00 <br /> 6 to 15 ndv Loam 0.79 IS2 <br /> 3. Calculate adso hon width ratio b dividin rock la er 16 ro so [,oam o.bo 2.00 <br /> � • �' g y 31 to 45 Silt Loam �� 2.40 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; �to�o c�a [.oam o.4s 2.6� � <br /> 1.20 d/ft2j�� d/ft�= a.I,� 61 co i2o �iay o�4 s.00 <br /> � ' � Slower than 120 Clav - - <br /> "Soil kuving 509G or more aE fine or very fine sand <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> a,c,�1 x�ft=�ft <br />