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MOUND <br />(For Flow <br />A. <br />‘ ^ ^ 9 • * <br />/;/. 4.-- /*.. <br />Hr E-19 <br />PROCEDURE <br />o 1200 gpd) <br />A. Sewage Flow Race <br />See D-7 or 1-3, 4, or 5, or u$e <br />mecered value; Flow Rate » <br />9r<r gpd <br />B. Septic Tank Liquid Volume <br />(see C-3 or C-5) //?.<;/C- gallons / <br />C. Soil Characteristics <br />1. Depth to restricting layer <br />such as seasonally saturated <br />soil, bedrock, coarse soil, <br />etc. ; _2 ^ Inches <br />•Depth of percolation tests; <br />/<? inches ^ <br />3. Number of percolation test <br />holes; S holes <br />4. Ave. percolation race; <br />/I . € mpi __ _ <br />5. Landslope ■ >7 <br />V <br />/ <br />D. Rock Laver Dimensions' <br />1. Multiply gpd by 0.S3 to <br />obtain required area of <br />rock layer; <br />gpd X 0.83 * 7SO sq ft / <br />2. Select width of rock layer <br />(10 feet or less) * feet y <br />3. Length of rock layer ■ Area <br />- Width 750 sq ft - /i? ft ’ / <br />~ ys.—i^-------/ <br />E. Rock Volume <br />1. Multiply rock area by rock depth <br />to get cubic fep« of rocl^ <br />7J_£_sq ft x^^_ft «_rii*f5cu ft / <br />2. Divide cu f c/sp 27 ci?^^cu yd <br />to get cubic yards; <br />3. Multiply cubic yards by 1.4 to <br />get weight of rock in tons; <br />7<r-..7?cu yds X 1.4 - ??. /7/cons <br />F. Pressure Distribution System <br />1. Select number of perforated <br />la corals 7 i <br />Select perforatioiv spacing7 <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 />a perforation <br />If manifold is in'' y <br />rock layer, lateral <br />one-half rock layer <br />length less half a perforation <br />spacing. Perforated lacer^^ <br />less half <br />spacing, <br />center of <br />length is <br />length t. <br />4. Divide lateral length by perfor­ <br />ation spacing to get number of <br />perforations per lateral <br />yv. 5 feet f 3 feet = /i_ ;)ei~ <br />Note: last perforation must be <br />in end cap, (see page E-14) <br />5. Multiply perforations per <br />lateral bv number of laterals <br />to get total number of <br />perforations; <br />/2 porfs/lac x r lacs <br />6. Determine required flow ^ <br />by mul f'plying number of| <br />perfora ;..ons by flow' per <br />perforation (see page E-1 <br />perfs x^.Ti'gpm/pcrf .•'gum >/- Wceauired*7. Select minimum required* lateral <br />diameter from cable on Page E-17; <br />e ‘er cable with perforation <br />>-;.ciug, perforation diameter, <br />. mber of perforations per <br />Select minimum <br />dio.-itfcar for perforacetT^ 1 <br />1 <br />_• #inches <br />C. Bcisal Width <br />^ '"I" ' <br />Percolation race in cop 12 <br />inches of soil is 7 <br />2. Select allowable soil loadinp, <br />rate *rom tabic on paRC E-16; <br />•.* _BPd/ft:^ <br />Mt.