Laserfiche WebLink
' � � <br /> MOL�NI� DESIGN WORK SHEET (For Flows u to 1200 d) <br /> A. Average Design FLOW A-l: Estimoted Sewage Flows in Gallons per Day <br /> num er o <br /> Estimated �J gpd (see figure A-1) bedrooms Closs i Clau II Class III Closs IV <br /> or measured x 1.5 (safety factor) = gpd 2 300 225 �eo � <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 /> �-/Uoo allons (see ure G1) � ��� � 3�0 ��, or u� <br /> g �$ 8 1200 675 408 columns. <br /> C. SOILS (refer to site evaluation) C-l: Se ticTaokCa acities('m albns) <br /> liquid capaciry <br /> Number of Minimum Liquid Liquid capaciry with W��disposal& <br /> 1. Depth to restricting layer = �.S feet B�i00� �P�'ry S�age disposal lift iaside <br /> 2. Depth of percolation tests = /,v feet z o�iess �so >>u �Soo <br /> 3. Texture /,..�a•�-� 3 or 4 �000 �s� z000 <br /> 5 w 6 1500 2250 300p <br /> Percolation rate � mpi �,8 or 9 Z000 3000 <br /> 4. Soil loading rate �� 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 /> � gpd x 0.83 sqft/gpd = �s� sqft <br /> 2. Deternvne rock layer width = 0.83 sqft/gpd x linear Loading Rate (LLR <br /> 0.83 sqft�gpd x a �pd/sqft = �v ft Mound LLR <br /> 3. Length of rock layer = area =width = <br /> sv sqft (D1) = !v ft (D2) _ �-�" ft < 120 M PI < � 2 <br /> E. ROCK VOLUME > 120 M PI < b <br /> 1. Multiply rock area (Dl) by rock depth of 1 ft to get cubic feet of rock <br /> ��v sqft x 1 ft = a� cuft <br /> 2. Divide cuft by 27 cuft/cuyd to get cubic yards <br /> a� cuft = 27 cuyd/cuft = /o cuyd <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons <br /> /U cuyd x 1.4 ton/cuyd = �`� tons <br /> D-33: Absorption Width Sizing Table II <br /> i <br /> F. SEWAGE ABSORPTION WIDTH PcrcoletionRa�c �d;�gRe« <br /> in Minutcs{xr Soil Tcxturc Gallons Absorpuon <br /> Inch {xr dsY per Ralio � <br /> MPf uarc foai <br /> Fastcr than 5 Coaru Sand 1.20 ��� <br /> Mcdium Sand <br /> Absorption width equals absorption ratio (See Figure D-33) LoemySand <br /> times rock layer width (D2) ,b��3o Loam o.� _ Z� <br /> 31 to 45 Sill Loam 0.50 2,40 <br /> n ( � 46�0 60 Sandy(7ay OAS 2.6% <br /> � )( � 1 t - 0'� Et Silly Clay Lonm <br /> 61�o I20 Siity Clay 0.24 5.00 <br /> Sandy Clay <br /> CI� ._.. ..__--. . <br /> SI�wcr than 120' ---- -—�— <br /> i <br /> •Srs�rn�dolpnea br N«wds nu.�rK«ncr o�rcrlomucxa <br />