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>■ <br />r <br />ip; <br />E7It- <br />:«■ <br />i\ <br />m; <br />f'" <br />b'.•;...v:;;\. <br />I;-- <br />V:;.. <br />5*. <br />S5;v; <br />m <br />mi:^ <br />rt <br />F; <br />f4i <br />■ " 'I ' '. .■! !UH .1 . -,I . !-■" L. i'^r,i'; <br />’/■ ■^'/yyCf- Oy^Z/V/. vr <br />E-19 <br />• •: '\:.''Vt?'MOUND DESIGN PROCEDURE <br />(For Flows up to 1200 gpd) <br />A. Sewage Flow Rate <br />Sec D-7 or 1-3, 4, or 5, or use <br />metered value; Flow Rate <br />gpd <br />m y <br />F. Pressure Distribution System <br />Select number of perforated y <br />laterxils ^ ^ <br />1. <br />0^'M- <br />■{ <br />:f. <br />Vp'* 1. <br />B. Septic Tank Liquid Volume <br />(see C-3 or C-5) M^Tisllons ,fo^ -looet^izxo <br />2. Select perforation spacing <br />- •=? ft <br />/ <br />C. Soil (niarscceristlcs <br />•k <br />/kUAft^ <br />1. Depth to restricting layer <br />such as seasonally saturated <br />soil, bedrock, coarse soil, <br />etc.; 3H inches <br />2. Depth of percolation tests; <br />inches <br />3. Number of percolation test <br />5 holes <br />4. Ave. percolation rate; <br />/2\ 3 mpi <br />S. Landslopc 7 X y <br />D. Rock Layer Dimensions' <br />1. Multiply gpd by 0.83 to <br />obtain required area of <br />rock layer; <br />9££_gpd X 0.83 - 75‘g2 sq ft <br />2. Select width of rock layer <br />(10 feet or less) ■ feet <br />3. Length of rock layer - Area <br />- Width 22£.»q ft - ft * / <br />- 75^<? ft * y <br />E. Rock Volume <br />1. Multiply rock area by rock depth <br />to get cubic feet of rock; <br />7 5^ sq ft %, O.'fS lx. •S^J.ScM ft <br />2. Divide cu ft by 27 cu ft/cu yd <br />to get cubic yards; Jj , <br />3. Multiply cubic yards by 1.4 to <br />get weight of rock in tons; <br />7^.;r?cu yds X 1.4 - 2?. //tons <br />m <br />3. Selerr perforated lateral <br />If uot.., Note if manifold is <br />at end of rock layer, lateral <br />length is rock layer length <br />less half a perforation <br />spacing. If manifold is in <br />center of rock layer, lateral <br />length is one-half rock layer <br />length leas half a perforation <br />spacing. Perforated lateral <br />length « S C ft. X <br />4. Divide lateral length by perfor­ <br />ation spacing to get number of <br />perforations per lateral <br />y?, 5> feet f 3 feet - perfs <br />Note: last perforation must be <br />in end cap, (see page K-14) <br />5. Multiply perforations per <br />lateral by number of laterals <br />to get total number of <br />perforations; <br />/S pcrfs/lat X j£_lats » "JSL <br />iP‘n <br />6. Determine required flow rat <br />by multiplying number of <br />perforations by flow per <br />perforation (see page E-1 <br />ytf perfs x^.y/gpm/perf <br />7. Select minimum required lateral <br />diameter from table on Page E-17; <br />enter table with perforation <br />spacing, perforation diameter, <br />and number of peri'ox n *^.ions per <br />lateral. Select mir.^. <br />diameter for pjy>#crrfflp d in <br />incifes 2,^*t <br />C. Basal Width <br />1. Percolation rate In Cop 12 <br />inches of soil is /^. 3 mpi <br />2. Select allowable soil loading <br />rate from table on page E-lb;4 <br />VJ <br />E) <br />l(y O, fTc? Rpd/ft^ <br />. <br />■f <br />y,