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. MOUND DESIGN WORK SHEET (For Flows up to 1200 gpd) <br /> A. Average Design FLOW A-1: Estimated Sewage Rows in Gallons per Day <br /> number of <br /> Estimated 450 gpd(see figure A-1) bedrooms Class I Class II Class 10 Class IV <br /> or measured x 1.5 (safety factor) = gpd 23 4450 225 2 of 80 60ne <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 /> 7 10.5(} 600 37t1 II,or 111 <br /> — jF�84 gallons(see figure C-1) 8 1200 675 408 columns. <br /> C-1: Septic Tek Capacities(in ► <br /> C. SOILS (refer to site evaluation) Liquidtmpxity <br /> Number of Minimum Liquid Liquid capacity with with disposatcF <br /> 1. Depth to restricting layer= <br /> 2... 3 feet &dams Capacity garbage disposal lift inside <br /> 2. Depth of percolation tests = 1 feet '_'or less 750 1125 <br /> a 4 1000 1500 2000 <br /> 3. Texture '«6 1500 3000 <br /> Percolation ra6 ,� mpi <br /> 4. Soil loading rate "7q gpd/sqft(see figure D-33) 7.8or4 3300 3000 4000 <br /> 5. Percent land slope .5—.5- % <br /> D. ROCK LAYER DIMENSIONS <br /> 1. Multiply average design flow (A)by 0.83 to obtain required rock l yer area. <br /> z-15-0gpd x 0.83 sqft/gpd = sqft- 4 <br /> 2. Determine rock layer width= 0.83 sqft/gpd x linear Loading Rate(LLR) LLR <br /> 0.83 sqft/gpd x gpd/sgft= / Mound <br /> 3. L. ngth of rock layer=area_width= <br /> sqft(D1)_ ft (D2) =_A1—ft < 120 MPI <12 <br /> E. ROCK VOLUME > 120 MPI < 6 <br /> 1. Multiply rock area(Dl)by rock depth of 1 ft to get cubic feet of rock <br /> //10 sgftx1ft= Id cuft <br /> 2. Divide cuft by 27 cuft/cuyd to get cubic yards <br /> cuft =27 cuyd/cuft=_L_aryd <br /> 3. Multiply cubic yards by 1.4 to get weight of <br /> nrock in tons <br /> cuyd x 1.4 ton/cuyd=s <br /> D-33: Aba orphan Width S'iziag Table <br /> F. SEWAGE ABSORPTION WIDTH ptRate Loading' <br /> in Minutes per Soil Texture Gallons N <br /> Absorption <br /> rs <br /> Inch day Ratio <br /> M <br /> _ and1.20 1.00 <br /> Faster Quin 5 4�ili m Saud <br /> tvamy Surat <br /> Absorption width equals absorption ratio (See Figure D-33) t �,_ I. <br /> times rock layer width(D2) 1666 . Si Loam <br /> Clay 6121 045 Z67 <br /> 1 ft 46t�� S y <br /> .: _1c ft=_____L____6- <br /> __LI ,y Loamx <br /> 61 tOpo SS�d�y 0.24 5.00 <br /> — <br /> SMneuihan 120` <br /> •Sra:mdCsiv�cd 1�tha+- ot'°m..or pertonlnp3e <br />