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• MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> ' ' Fstimazed Sewage Flows in Crellons per daY <br /> A. FLOW , d> <br /> Estimated �o��d N oianba I Type 1 Type II Type III Type <br /> IV <br /> or measured - x 1.5 = - gpd• °� <br /> z 30o us iso �, <br /> B. SEPT'IC TANK LIQUID VOLUMES 4 � 3� 2� �►►« <br /> s �so aso zva � <br /> a,-/oo o gallons ! 6 � � � 3�o Tn`� <br /> s ' izoo b�s aos � m <br /> ' I�� <br /> C. SOILS (refer to site evaluation) . ,�7ie1t ,� ,,,,�„ <br /> 1. Depth to restricting layer = ��� ��inches feet �+wa����r <br /> NumEa of Ninimum l+Wid liyud capriry`viN vnN 0ispuuldc <br /> 2. Depth of percolation tests = ►� inches � ��ry B��°"' "h`°''°` <br /> z�K� �w iiu isoo <br /> 3. Texture ��-��t �-o�� Percolation rate 3•3 mpi 3,K• �� �� � <br /> 5�K h I S00 2?SO � <br /> 4. Land slope S % '�"°`y 200° '°°° "'°° <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 /> �o o gpd x 0.83 sq. ft./gpd = 4q 4� sq. ft. <br /> 2. Select width of rock layer (max 10' if <120 mpi max 5') = i v ft. <br /> 3. Length of rock layer = area =width = �-A.�* a. •-:° .-�°•°. a : <br /> o � ao.as000_�, , <br /> c oa� �a= ;. <br /> �� s ft. - �� ft. = So ft. d �a�,.A�b.:Po: e: � <br /> q. a„Q.,a»a, a �.b.00: <br /> o a'a aDa yb� <br /> w�a�n �o j� �s .� 0'�'d09 'D w -o s <br /> <120mpi <10' Length s� ft <br /> >120mpi <5' <br /> E. ROCK VOLUME <br /> 1. Multiply rock:area by rock depth to get cubic feet of rock; y��� sq. ft. x �•U J� <br /> ft. = saa cu. ft. <br /> 2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br /> Sa� cu. ft. -27 =��cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons;l�cu. yd. x 1.4 <br /> ton/cu. yd. = a� tons. <br /> F. ABSORPT'ION WIDTH Absorption Width Sizing Table <br /> 1. Percolation rate in top 12 inches of soil is 3�3 mpi �o�m�w�;� c��� waoor,��, <br /> Minu�u per loc6 Soil Tacaue per day per width to Rxk <br /> Texture LL�� 1�0Y1 W� (MPp a9u:ue(ooa Laya wdth <br /> Fsster Nao 0.1 Coar:e Sand I.?0 1.00 <br /> 0.1 to 5 Saod i:?0 I.00 <br /> 2. Select allowable soil loadinp rate from table; o.��o s F�x s�a o.�o z.00 <br /> O 6 ta IS Sandy Loam 0.79 1.52 <br /> �ip�d/�Z ' I6 io 30 Loam 0.60 2.00 <br /> Cr 31to45 SiltLwm 0.50 2.40 <br /> 46 to 60 Gay Loam 0.45 2.67 <br /> 60 to 120 Clay 0.24 5.00 <br /> 3. Calculate adsorp�ion width ratio by dividing rock layer s��«��zo cuY o.�0 6.00 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br /> 1.20 gpd/ftz= ,y�/ gpd/ft2 = a-�� <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> a..�� x 10 ft = a�,� ft <br />