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will then be put in place over the trench to hold the EPDM in place. The dam therefore will actually be <br />incised and will be created from the excavation and its height is no more than 9 feet measured <br />anywhere from the dam bottom to the top. Since the Polypropylene liner is needed to prevent <br />percolation, the dam will be constructed out of existing waste rock, which is permeable, has no cohesion <br />and has an angle of repose of approximately 40 degrees, as seen on site in the existing piles. All strength <br />of this material is from internal angle of friction. <br />The 45 mil Polypropylene liner product data sheet is shown below: <br />Flexible Poll propylene Nonreinforced OPP) and Reinforced (MP -R) Geomembranes <br />Property <br />fPP -R <br />Testing <br />45 nails <br />Frequency <br />(uiinunuui) <br />Mass per Unit Area — lb /fr (nun. are.) <br />0.18 <br />15.000 lb <br />Thickness — mils (nun. are.) <br />45 <br />per roll <br />• lowest individual specinnen — inils (noininal — 100:0) <br />40 <br />Tensile Strength <br />• dturrbbell(') — lb/in. (nrin. are.) <br />• grab(') — lb (inin. are.) <br />15.000 lb <br />Tensile Elongation <br />'S0 <br />15.000 lb <br />• dunnbbellV•'-) - 0,0 (nun. are.) <br />• grabs') - °o (min. are.) <br />15.000 lb <br />Midtiaxial Elongation - ° o <br />?� <br />- <br />15.000 lb <br />forlmlation <br />Tear Resistance <br />• nonreinforced') — lb (nun. are.) <br />• reinforced�'� — lb (min. are.) <br />- <br />15.0001b <br />5 5 <br />15.000 lb <br />Puncture Resistance — lb (ruin. are.) <br />85 <br />1 i.000 lb <br />Ply Adhesion — lb (nun, are.) <br />15 <br />15.000 lb <br />Low Temperatuire Flexibility- - °F <br />-40 <br />formuilation <br />Carbon Black Content - �'o <br />-3 <br />45.00 lb <br />lb <br />Ultraviolet Light Resistance <br />per fonmi0 <br />(a) 0116 strength retained after 20.000 light hrs. <br />nia <br />- or — <br />(b) °'o elongation retained after 20.000 light hrs. <br />nia <br />- and — <br />(c) Surface Cracking Observation after 20,000 light lrs. <br />none <br />(d) Surface Chalking (or Powdering)rn after 20.000 light hrs. <br />minor <br />The Factor of Safety (FOS) for gravel with a 1.5H:1V slope, which is 33.7 degrees in GP classified material <br />with an assumed internal angle of friction of 40 degrees (same as angle of repose for cohesion -less <br />material), and simply evaluating the internal angle of friction as follows: <br />5 <br />