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MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FLOW <br />Estimated �_ gpd (seepages D-7 or I-3, 4, 5) <br />or measured gpd x 1.5 = <br />B. SEPTIC TANK LIQUID VOLUMES <br />1 • !a3-D 5 -A r !j allons (see pages C-3 or C-5) <br />C. SOILS (refer to site evaluation) <br />1. Depth to restricting layer = S o inches <br />2. Depth of percolation tests = i inches <br />3. Percolation rate �tf mpi <br />4. Land slope 0 �_% <br />D. ROCK LAYER DIMENSIONS <br />I. Multiply flow rate by 0.83 to obtain required area of rock <br />layer: Daily Flow x 0.83 = <br />q6h gpd x 0.83 sq. ft./gpd = 3 /3.Ssq. ft.=qt�° <br />2. Select width of rock layer 00 feet or less) _ _ /O ft. <br />3. Length of rock layer = Area + Width = <br />qcn sq. ft. = 0 ft. = fo ft. <br />E. ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />sq. ft. x ft. = ol> cu. ft. <br />2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br />AcD cu. ft. - 27 = ±1? cu. yd. <br />3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br />, cu. yd. x 1.4 ton/cu. yd. = .JJ tons. <br />P. AU5U1tY"11UN WIDTH <br />1. Percolation rate in top 12 inches of soil is c�'F mpi <br />2. Select allowable soil loading rate from table on page E-; <br />�b gpd/ftz <br />3. Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/ft' by allowable soil loading rate; <br />1.20 gpd/ft' _- t gpd/ft'_ , do <br />Check this value ot1 page E-16. <br />4. Multiply adsorption width ratio by rock layer width to get <br />required adsorption width; <br />cox fa ft= o')� ft <br />-11 <br />Estimated 5ewagc)'lows in Callms ptr duy <br />(gpd) <br />,ium xr <br />of <br />.I.ypc I <br />'Type li <br />Type III <br />jj <br />71V <br />Bedrooms <br />2 <br />300 <br />225 <br />180 <br />3 <br />450 <br />XXl <br />218 <br />60% <br />4 <br />600 <br />375 <br />256 <br />ord. <br />5 <br />750 <br />450 <br />294 <br />ralucr <br />in <br />6 <br />900 <br />525 <br />332 <br />Tpps I. <br />7 <br />1050 <br />6W <br />370 <br />lu <br />B <br />1200 <br />5 <br />L2 <br />408 <br />1 column <br />Septic Tank copacilie; In <br />Rallanr <br />Number or <br />Minimum Liquid <br />I Liquid capw:iiywith <br />Iledrooms <br />Capacity <br />aarhage dirl+usal <br />2 or tell <br />750 <br />1125 <br />3 or 4 <br />IOIXI <br />15M <br />4 w 6 <br />ISM <br />2250 <br />7• 11 or 9 <br />2(XX} <br />31XX1 <br />oror 9 <br />...... <br />Rock lied <br />:r�::r :•:.�. <br />T <br />Width s <br />••Length••- <br />i <br />Ahsnrplion Width Stunt: Table <br />I'MrOlMliOn Rate <br />in Minutes per <br />Inch (Mill) <br />Soil Teslure <br />Gallons <br />per day per <br />syusre foot <br />itatio of <br />Absorption width <br />it, flack Layer <br />Width <br />Faster than 0.1 + <br />Coarse-S•rtxl <br />...__ <br />0.1 to 5 <br />Sand <br />1.20 <br />1.00 <br />0.1 to 5 - <br />Fine Sand ++ <br />0.60 <br />2A) <br />61015 <br />Sandy Loam <br />0.79 <br />1,52 <br />1610 30 <br />Loom <br />0.60 <br />2.IX1 <br />31 to45 <br />Silt Loam <br />0.50 <br />2.40 <br />46 to 60 <br />Clay Loam <br />0.45 <br />2.67 <br />60 to 120 <br />Clay <br />0.24 <br />5.OU <br />Slower than <br />Clay <br />120*i* <br />