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�l r ,��'� 5 <br /> • � MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> �vis�� Av I�R <br /> A. �,QW Estimated Sewage Flows in Gallons per day <br /> Estimated��'d gpd Nu�mber 'fype[ Type II) Type ID Type <br /> or measured x 1.5 = gpd. `� <br /> z soo Zzs iso � <br /> B. SEPTIC TANK LIQUID VOLUMES a 6 o s°�s° z's6 °f''� <br /> �� <br /> �-Z�� gallons 6 '9050o s� s�z T,',�,. <br /> � ioso bao s�o a a <br /> 8 1200 675 408 � <br /> C. SOILS (refer to site evaluation) � ,�� `�'°"`� <br /> • �n,� ,a���. � <br /> 1. Depth to restricting layer= inches�feet � �����y <br /> 2. Depth of percolation tests =�I inches `�""�`"� "'�N�`�`x"d�ry� .���& <br /> eea�� c��r sa�eage a�:�� ��h�wae <br /> 2�x kss �so i i u �soo <br /> 3. Texture_ �-� Percolation rate mpi :�,.�. �� ,� � <br /> s���e �sao zuo woo <br /> 4. Land slope % 7.R�n Y 2� 3� � <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 /> �� gpd x 0.83 sq. ft./gpd = ��sq. ft. <br /> 2. Select width of rock layer (max 10' if<120 mpi max 5') _�ft. <br /> 3. Length of rock layer=area=width = Aa�n� aa�o ��6 an� ��aa � <br /> o;�>.��:. ����: �a <br /> � q• -,�fZ =�� .. Q,o� a e Q ,. <br /> s ft.= ft. ft. a�P���S��b�«�t�;: o <br /> .. . . . <br /> aIIOq°Op°'4R w e-a.e-e;aa a�a . :: <br /> d .:.o �o� a�onD•u� � _ :. .: ,. . , :. <br /> Wl�lll � �l 40 `'°'�>` 'ot?G'a6pDa '.ff '. d, o&e <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; .�2 sq. ft. x � <br /> ft. _�cu. ft. <br /> 2. Divide cu. ft.by 27 cu. ft./cu. yd. to get c�bic yards; <br /> �cu. ft. =27= Z 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. ABSORPTTON WIDTH Absorptioo Width Sizing Table <br /> 1. Percolation rate in top 12 inches of soil is�mpi ���� c�u� x�o�r.�� <br /> Minuta per Inch Sal Texaue per day per width to Rock <br /> Texture��� (MPn squate foot Layu wdth <br /> Faster than 0.1 Coaru Saud 1.20 1.00 <br /> 0.1 to 5 Sand 1.20 1.00 <br /> 2. Select allowable soil loading rate from table; o.��s Fine Sand o.�o z.00 <br /> 6 a 15 Swdy Loam 0.79 1.52 <br /> 16 w 30 Loam 0.60 2.00 <br /> � �d�� si was s�c[.oam oso 2.ao <br /> 46 to 60 qay Losm 0.45 2.67 <br /> 60 to 120 Ctay 0.24 5.00 <br /> 3. Calculate adsorption width ratio by dividing rock layer s��«m��Zo Gay o.zo 6.00 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br /> 1.20 gpd/ft2=��gpd/ftz= z � <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> Z X !b �-� ft <br />