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Egerdal September 19, l99i; Page 3 <br />System Design <br />------------- <br />The design base is a Typ.a I. 3 -bedroom `•rsi dere_ a with an <br />average percolation a;,e .-.f 18 mpi.. <br />3 -Bedroom Type 1 Residence <br />---------------------------- <br />3 bedroom x 150 gal. Type I home = 45o gal l � Win=_ per day (:gpd ) <br />450 gpd x 1.67 sq ft per gal. per day x .8 = 6,..,2 square feet of <br />Tankst 2 - 1,000 gallon pre -cast tank(s) dr-ainfield is required <br />NOTE; if exisking tanks meet all codes when inspected <br />they nay be used with the new system. <br />Tank(s) must be installed level, 6" inspc-ction pipes must be <br />installed verticla to tanl:: at both baffles and in the center <br />manhole.(nota; tanks should be pumped every 2 years) Schedule # 4,::. <br />p.v.c. pipe must be used between house acid inlet to tarq-., and <br />between tanks if there is rrsore than one tank. <br />Trench construction must t..: shallow and fallow the contour of the <br />slope (note; contra_+or shoot elevations tc- obtain the <br />contour). Bottom of dra.infi eld trenches must be level frc-m dr, -,p box <br />to trench end. Insta.l.l 1: -inches of 1 1::_' - 2 inch washed binder <br />rock below 4 -inch dr- in t� le with 2 - 4 inc=hes of rock: -:-r the - <br />tile, 4 - 6 inches of hay :over over rock: and backfilled onate; <br />instead of hay a geo-textile fiber may be used). Trench depth below <br />existing grade will nary from 16 to A20 inches. See site sketch for <br />elevations. The Plastic limit of the sail crust be acceptable_- in <br />--nrder to work soils. <br />A vertical inspection Pip- at least 1 1/2 in%hcis in diarrsrter shall <br />be installed in each drainfield rack layer at the end of every <br />trench. The inspection pipe shall be located at an end opposite frrl, <br />where the sewage tanl: effluent enters the roct:: layer. Tile <br />inspection pipe shall hay.- 2/8 inch, or larger, perforations spay=ed <br />vertically no more than six inches apart. At least two perf,:rations <br />shall be located in the rack layer. The inspectic.n pipe sliall <br />extend to the bottom of the rock layer and shall be capped flush <br />with or above finished grade. <br />A water meter can be installed to insure the actual water use does <br />not exceed the disigiied capacity. <br />