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Step 9(cont.) <br /> FSm—Factor of Safety for creep to correlate the short term tensile strength <br /> (TS.)at a specified strain (TAU)to the Creep Limited Tensile Strength for <br /> the required design life(Cafe)(per ASTM D5262) <br /> FS o—Factor of Safety for Durability to account for chemical and biological <br /> degradation(pec GR.I GG4) <br /> FSm -Factor of Safety for Installation Damage(per GRI GG4) <br /> FSna—Factor of Safety for Joints at roll ends(per GRI GG4) <br /> Step 10 <br /> ® Determine if the selected geogrid is adequate <br /> LTADS z TR <br /> 8.0 Design RvamJrle Problem <br /> A new landfill is to be constructed on the sideslope of a closed landfill. The liner system <br /> will consist of a 2 foot thick clay layer immediately below a 60 mil HDPE geomembrane. <br /> A one foot thick sand layer acts as a leachate collection system above the geomembrane. <br /> A non-woven fiber geotextile is located between the leachate collection system and an <br /> overlying 6 inch soil layer. The liner system will support one hundred feet of waste. The <br /> engineering parameters for the soil and waste are as follows: <br /> Thickness(ft.) Unit Weight.(IbsJcl) Effective Friction <br /> Angle(degrees) <br /> Clay 2 130 28 <br /> Sand 1 120 32 <br /> General Fill .5 120 32 <br /> MSW 100 70 25 <br /> (9) <br />