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The Leadville Mill M1990-057 <br /> EXHIBIT C—MILL PLAN <br /> Page 4-29 <br /> o Subdrain along seep: <br /> ■ Seep flow is not controllable with standard pumping techniques <br /> (standing water). <br /> ■ Installation of subdrain along seep, directing water from seep to <br /> an infiltration area within the TSF structure as shown in Figure <br /> 4-7, Subdrain Detail and Figure 4-12, Subdrain Location. <br /> ■ Following installation of the subdrain, compaction to 95% <br /> standard proctor, ±2% optimum moisture, and grading of sub <br /> base on interior slope ±1" on 50ft grid, then the geosynthetic <br /> clay liner is installed. <br /> • If the geosynthetic clay liner is prematurely hydrated during installation, it may <br /> remain in place if the following conditions are met. <br /> o Geotextiles have not been separated, torn or otherwise damaged. <br /> o No evidence that needle punching between the geotextiles has been <br /> compromised. <br /> o Geosynthetic clay liner does not leave deep indentions when walked <br /> upon. <br /> o Overlapped and bentonite-enhanced seams are intact.20 <br /> LEAK DETECTION AND SUMP CONSTRUCTION <br /> • Performed by contractor, monitored by Mill Superintendent and/or Owner's <br /> Engineer. <br /> • Layout and grade detection layer collection sump system. <br /> • Liner material contractor will install and test21 the leak detection drainage net <br /> system in accordance with manufacture's recommendations. <br /> IMPOUNDMENT LINER INSTALLATION <br /> • Performed by contractor, monitored by Mill Manager and/or Owner's <br /> Engineer. <br /> • Layout and grade anchor trench for geomembrane liner. <br /> 20 AlAR1Q5 <br /> 21A1AR1Q5 <br />