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MOUND DESIGN WORK SHEET(For Flows up to 1200 gpd) r . <br /> A. 'Average Design'FLOW..• : .,A-1: Estimated Sewage Flaws in Gallon•per Day <br /> ' number of <br /> Estimated . O (� d(see figure A-1) • bedrooms Class I . Class H Class III Class IV <br /> or measured ;x 1Z (safety factor) gpd 2 ••300 •225 • 180 60% <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 /> D O all ns(seefigure C- ) 7 1050 600 370 1i,or III <br /> -/O <br /> $ Q fi 1 : .8':': . 1200:. . 675 . . 408 columns. <br /> C. SOILS (refer to site etaluation) . cl:Septic'Mak Capacittet(in' allots) . ' <br /> 3,;...13..Z Number of• .Minimum uid uid Wacky with :with icapaary <br /> • V9 � ••U9. P°c h . with disposal& <br /> 1. Depth'to restricting layer=.�.i r A-iia.'' feet std gofhltBedisposal lift inside <br /> 2. . Depth of percolation tests= 1.0 feet 2orless 730 .. . Alas 1500 <br /> 3. Texture LOA w1 • sa6 . Is500 • 12.250 • 3000°00 <br /> Percolation rate 4, 1, mpi • • 7r 8 or 9. . .2000. 3000 4000 <br /> 4. Soil loading rate ,W5' gpd/sgft(see figure D-33). : <br /> 5. Percent land slope • 1 • % • ..- <br /> D. ROCK LAYER DIMENSIONS • . . • • <br /> • <br /> 1. Multiply average design flow (A)by 0.83.to obtain required rock layer area. <br /> • <br /> C440 gpd x p.83 sqft/gpd = Lkgw sqft ' <br /> • 2. Determine rock layer width= 0.83 sqft/gpd x linear Loading Rate(LLR) . . <br /> 0.83 sgfttgpd x 11 k gpd/sgft= J0 • ft . • . Mound SLR <br /> 3. Length of rock layer=area+.width= , <br /> ycYq • sqft(D1) i- 10 ft(D2) = J ft- :: . . .. < .12.0' M PI •<1.2 <br /> E. ROCK VOLUME • 's >120 MPI < 6 <br /> 1. Multiply rock area (D1)by rock depth of 1 ft to get cubic feet of rock ' .' . • <br /> -I ce sgft x 1 ft= 4 .cuft . , . .. . <br /> 2. Divide cult by 27 Luft/•cuyd to get cubic yards <br /> Nc)q cuft +27 cuyd/cuft. •14 .cuyd <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons. <br /> led cuyd x 1.4 ton/cuyd _ as' tons <br /> : Dti73i.AbsprptioiiWidth Sizing Tibia'' <br /> Percolation Ratio :Goadiria Rua• <br /> F. SEWAGE ABSORI''1'ION WIDTH ,a Minutes per. soil Texture Gallons Absorption <br /> • Inch prdayper Ratio <br /> - WI)• . ... -•snare tbol <br /> ' • <br /> `' Plaster than 3 ' Cons Sand 1.20' 1.00 <br /> . . Medium Sand. , .. _ <br /> Absorption width equals absorption ratio (See Figure D-33) - �• • `'Pp6i1inq�a'r5 • • <br /> •S,ndsy,)�.rn .� 7129 1-SO <br /> times rock layer width'(D2) :: 11 It i siert; ' 8: 8 Y8 <br /> slit <br /> a.vi x /O ft= al.o•'I . ft 46 to 60 SandyPay0.45 2.67;}:x <br /> 61 to 120 s'ityy an 0.24 5.00 <br /> sandy Clay <br /> aY <br /> • <br /> • Slower than 120' <br /> •Struts asdprd Mery ssM ansa M ether ar eursrm.so. <br /> • I .. .. .. .. -... .... ...... _. .. .- .S ._ ...... .... <br />