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Drainage—for subsurface, interceptor and edge drains. <br /> Adequate drainage is essential for achieving Supac N eliminates the problems associated <br /> and maintaining soil stability. Effective drainage — in with: <br /> embankments, in roadways, under airfields — • Determining aggregate graduation required to <br /> requires a properly designed and constructed match soil conditions. <br /> protective filter to insure long life.Graded aggregate • Finding a convenient and economical source <br /> filters have traditionally been used for drain of a specific aggregate gradation. <br /> protection, but the problems of design, cost, <br /> placement and testing of aggregate filters makes •Transporting and placing a graded aggregate. <br /> Supac N an attractive alternative. • Quality assurance of the in-place aggregate gra- <br /> dation to insure filter performance. <br /> Usual installation procedure. <br /> 1. Excavate the trench to the design dimensions. <br /> 2. Line the trench with Supac fabric allowing for a six- <br /> inch overlap at the top. <br /> 3. Place the aggregate in lifts and compact. <br /> 4. Close the Supac fabric. <br /> 5. Seal the drain by placing native soil or aggregate <br /> over the closed drain. <br /> Placing a pipe in the aggregate drain will in RAN <br /> - <br /> crease the capacity of the drain. It is suggested the <br /> pipe be placed after an initial lift of aggregate is ` <br /> placed and property compacted. <br /> Recommended geotextile specification for subsurface drainage. <br /> The geotextile shall be of nonwoven needle- allow the passage of water as specified. The fabric <br /> punched construction and consist of long chain should be free of any chemical treatment or coating <br /> polymeric fibers composed of polypropylene, poly- which reduces permeability and shall be inert to <br /> ethylene or potyamide. The fibers must be oriented chemicals commonly found in soil. The geotextile <br /> into a multidirectional stable network whereby they shall conform to the following typical physical <br /> retain their positions relative to each other and properties indicated below. <br /> PHYSICAL PROPERrY TEST PROCEDURE TYPICAL TEST RESULTS <br /> Tensile Strength,wet,lbs. ASTM D-1682 120 <br /> Elongation,wet,% ASTM D-1682 40 <br /> Coefficient of Water Permeability,cm/sec. Constant Head'(50mm) 0.10 <br /> Puncture Strength,lbs. ASTM D-751* 65 <br /> Pore Size—EOS,U.S.Standard Sieve Corps of Engineers CW-02215 40(Maximum sieve size) <br /> 'Tension testing machine with nng clamp;steel ball replaced with a 5/16"diameter solid steel cylinder with hemisphencal tip centered within the ring clamp. <br /> 6 <br />