1993-06-04_GENERAL DOCUMENTS - M1977378

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Protective liner for impermeable membranes — upat water reservoirs, liquid waste holding ponds. Nonwoven Supac is an economical replacement for the sand layer that traditionally is placed Impermeable membrane SII N beneath flexible membrane liners. When installed under the impermeable liner of storage ponds, a., ...... �f ------------ Supac forms a cushion that protects the membrane from being punctured by sharp rocks and vents gases that would otherwise build up and cause the liner to rupture or float. Supac being used as a protective liner. Supac also has waste ponds covered. Supac N is an effective separation membrane membranes and in the capping of ponds filled vvith that assists in the safe capping of ponds filled with waste materials. mine tailings and other waste materials. Installed Sand Clay cap directly over the waste materials and covered with a Supac N layer of soil, the geotextile provides a high strength, permanent surface while allowing underlying mois- '0 ture to permeate through and eventually dry out the W.' a' 0-3! pond. The heavier grades of Supac N(8NP-16NP)are Y1 recommended as protective liners for impermeable Using Supac to cap a pond. Tailings,landfill debris and/or refuse Supac saves money down the railroad tracks, too. The compact, highly puncture and abrasion re- provide subsurface drainage. sistant characteristics of Supac N enable it to help The heavier grades of Supac N are recommend- stabilize and promote drainage of weak soils. Rail- ed for railroad trackbed stabilization. If used for sub- road engineers are using this permeable geotextile in surface drainage, the geotextile should conform to new construction, at crossings, switches and at iso- the physical properties presented in the drainage lated locations to minimize subgrade pumping and to section. Ballast Supac N Ballast Tie -1.Sqpac N Moisture 9