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MOUND DESIGN WORK �HEET(For Flows u to 1200 d) <br /> A. Average Design FLOW A-1: Estimated Sewage Flows in Gallons per Day <br /> num er o <br /> Estimated �-�0 gpd (see figure A-1) bedrooms Closs 1 Class II Class III Class IV <br /> or measured --- x 1.5 (safety factor) _ -- gpd 2 soo 225 �8o bo% <br /> 3 450 300 218 of the <br /> 4 600 375 256 values <br /> B. SEPTIC TANK Capacity 5 750 450 294 in the <br /> 6 900 525 332 Class I, <br /> �--1 a S� gallons (see figure C-1) � ��� �0 3�o ii, o�iii <br /> i a���e� �L���,f, GW,��„��,�-��._ 8 1200 675 408 columns. <br /> C. SOILS (refer to site evaluation) C-]: Se ticTankCa acilies(in allons <br /> Number of Minimum Liquid Liquid capacity with Liquid capacity <br /> 1. Depth to restricting layer = Bea��ms Ca acit arba e dis osal W��'disposal& <br /> __/�a� � �.c`J feet P y g g P lifl inside <br /> 2. Depth of percolation tests = %.ca feet zo�iess �50 >>zs �s� <br /> 3. Texture ���� �—���'l' 3 or 4 �000 isoo z000 <br /> 5 or 6 1500 2250 3000 <br /> Percolation rate �<�� mpi �,S or 9 z000 3000 <br /> 4. Soil loading rate �'i� gpd/sqft(see figure D-33) <br /> 5. Percent land slope � % <br /> D. ROCK LAYER DIMENSIONS <br /> 1. Multiply average design flow (A) by 0.83 to obtain required rock layer area. <br /> 7 0 g-pd x 0.83 s�jft/gpd = (B 2,��. sqft a ►����� G��'�t" <br /> 2. Determine rock layer width = 0.83 sqft/gpd x linear Loading Rate (LLR <br /> 0.83 sqft/gpd x 1 :�, gpd/sqft = 1 � ft Mound LLR <br /> 3. Length of rock layer = area = width = <br /> C�`�'-I sqft (D1) = 1 o ft (D2) = t,�� ft < 120 M PI < � 2 <br /> E. ROCK VOLUME > 120 M PI < 6 <br /> l. Multiply rock area (Dl) by rock depth of 1 ft to get cubic feet of rock <br /> 1����!`-1 sqft x 1 ft = 1�:�'�'�-? cuft <br /> 2. Divide cuft by 27 cuft/cuyd to get cubic yards <br /> (.��`�- cuft = 27 cuyd/cuft = � f cuyd <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons <br /> � `� cuyd x 1.4 ton/cuyd = _ � ;; tons <br /> D-33: Absorption Width Sizing Table <br /> F. SEWAGE ABSORPTION WIDTH Percolation Rate Loading Rale <br /> in Minutes per Soil Tez�ure Gallons Absorption <br /> Inch per day per Ratio <br /> MP� s uare fool <br /> Fastcr lhan 5 Coarsc Sand 1,20 1.00 <br /> Medium Sand <br /> Absorption width equals absorption ratio (See Figure D-33) LoamySand <br /> Fine and <br /> times rock layer width (D2) 16to30 Loam o.�o z.00 <br /> 31 to 45 Silt Loam 0.50 2.40 <br /> �r�.f l �( ��� 1 t = ��(,s' ! f t 46 to 60 Sandy Clay Loar 0.45 2.67 <br /> Silty Clay Loam <br /> 61 io 120 Silty Clay 0.24 5.00 <br /> Sandy Clay <br /> Cla <br /> Slowcr than 120• <br /> •Sysiem desi�ned for Nese soils mus�p�other or performance <br />