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The Leadville Mill M 1990-057 <br /> EXHIBIT C—MILL PLAN <br /> Page 4-24 <br /> A US Fabrics, Inc 220GN Geocomposite Drainage Layer, or equivalent, will be placed <br /> on the interior slopes and bottom where there are seeps to protect the GCL from <br /> premature hydration during the installation process. The GDL will be installed <br /> concurrently with the GCL, leak detection system, and polypropylene geomembrane <br /> liner. GDL specifications and installation instructions are presented in Appendix 4- <br /> 1.4, Geocomposite Drainage Layer.16 <br /> 4.3.5 GEOSYNTHETIC CLAY LINER (6.3.3(2)(b)) <br /> The geocomposite drainage layer will be installed in the Spring of 2021. <br /> A Bentomat®DN geosynthetic clay liner, or equivalent, will be placed on the interior <br /> slopes and impoundment bottom. The geosynthetic clay liner is installed concurrent <br /> with the leak detection drainage net system and the 45mil polypropylene <br /> geomembrane liner. Geosynthetic clay liner specifications are presented in <br /> Appendix 4-1.1, Geosynthetic Clay Liner. <br /> 4.3.6 LEAK DETECTION SYSTEM (6.3,3(2)(b)) <br /> The leak detection system will be installed in the Spring of 2021. <br /> Concurrent with the installation of the geosynthetic clay liner, a seepage leak detection <br /> system will be placed between the geosynthetic clay layer and the synthetic liner with <br /> the collection system located in the northwest corner of the impoundment, and the <br /> impoundment bottom sloping at 0.5%to the northwest. <br /> Figure 4-5 shows additional details on the leak collection system and sump. The leak <br /> detection system is concurrently installed between the top layer of the 1x10-6cm/s (or <br /> less)geosynthetic clay liner and the 45mil polypropylene geomembrane liner. The leak <br /> detection system is a composite drainage product, produced by thermally laminating <br /> a 6oz/yd2 nonwoven geotextile to both sides of a polyethylene drainage net, capable <br /> of intercepting liquid within the leak detection zone and conveying the liquid to a <br /> collection sump for storage. The leak detection drainage net system is shown on Figure <br /> 4-5 and Figure 4-6. <br /> 16 A1AR1Q5 <br />