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y sir.-,,•:; �,n s <br />E-19 <br />MOLT-D DESIGN PROCEDURE <br />(For Flows up to 1200 gpd) <br />A. Sewage Flow Rate <br />See D-7 or I-3, 4, or 5, or use <br />metered alue; Flo a = <br />0 spd <br />B. Septic Tarl• '.iquid Volume / <br />(see C-3 -5) /DDO gallons ✓ <br />C. Soil Characteristics <br />1. Depth to restricting layer <br />such as seasonally saturated / <br />soil, bedrock, coarse soil, / <br />etc.; 36 inches .../// <br />2. Depth of percolation tests; <br />/ 8 inches <br />3. Number of percolation test <br />holes; e holes ✓ <br />4. Ave. percolation rate; / <br />_'•32 mpi ✓ <br />5. Landslope - '6 <br />D. Rock Layer Dimensions <br />1. Multiply gpd by 0.83 to <br />obtain required area <br />roc} layer; (�23 <br />qdp gpd x 0.83 =_ <br />2. Select width of rock layer <br />(10 feet or less) _ /D feet <br />3. Lengt�}��f r ck layer - Area <br />- WidtfiS sq f t <br />�oz3� <br />E. Rock Volume <br />1. Multiply rock area by rock dept! <br />to get cubic feet of rock; (o'lr3 <br />r 23 .s9fl sq f t x / f t =�cu f <br />(p 2. Divide cu ft by 27 cu ft/ <br />to get cubic yards; D-_> <br />3. Multiply cubic yards by 1` <br />get weight of rock in to s, <br />/�. J cu yds x 1.4 =_I <br />32 ,z <br />F. Pressure Distritution System <br />1. Select number of perforated <br />laterals 6 <br />2. Select perforation ;;pacing <br />.3 ft <br />3. Select perforated lateral <br />length; 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 tanifold is in <br />center of rock layer, lateral <br />length is one-half rock la er <br />length less half a perf rati <br />spacing. ,,P'errfforat latera� <br />length =;L1!� f . Zq <br />4. Divide lateral llleng perfor- <br />ation spacir; to get number of <br />perf rations per lateral 10 <br />2 .5 feet _ 3 feet a perfs <br />Z ' Note: last perforation must be <br />in end cap, (see page E-14) <br />5. Multiply perforations per <br />lateral by number of laterals <br />to get total number.of <br />perforations; / 0 <br />1 perfs/lat x _lats a �� <br />6. Determine required flow rate <br />by multiplying number of <br />perforations by flow per-x <br />perforation perforation (see page E-17) ,,,, .q <br />(00 perfs x .7ygpm/perf =.7 . S pm� <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 perforations per <br />lateral. Select mil <br />diameter for per ated lat al <br />= inche lt� <br />C. Basal Width / <br />1. Percolation rate in top 12 / <br />inches of soil is -?2 mpi <br />2. Select allowable soil loading <br />rate from table on page E-16; / <br />CIfE O. So gpd/f t2 ✓ <br />