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overburden and bedrock claystone materials needed for the liner construction can be excavated <br /> and used in a timely manner. During final reclamation, liner material will be stockpiled along <br /> the reservoir bottom for use. Soil stabilizing materials or topsoil for revegetation will only be <br /> placed above the expected reservoir high water elevation. <br /> Reservoir Liner Performance Standards. According to the SEO, the intent of the liner design <br /> (design standard) is to achieve groundwater inflow (leakage rate) into the below-grade reservoir <br /> that is not greater than 0.03 ft3/day/ft2 (1 x 10-5 cm3/cm2/sec) multiplied by the length of the <br /> perimeter wall in feet multiplied by the average vertical depth of the perimeter wall as measured <br /> from the ground surface to the mine pit bottom along the toe of the pit side slope, <br /> plus 0.0015 ft3/day/ft2 (5 x 10-7 cm3/cm2/sec) multiplied by the area of the bottom of the liner <br /> system or natural bedrock bounded by the perimeter wall. <br /> The performance standard shall be three times the design standard and shall be applied to an <br /> initial test of competency of the liner, as well as to the ongoing operation of the reservoir. The <br /> initial test will include a water balance analysis to demonstrate that the balance of the inflows <br /> and outflows equals the change in storage volume over a minimum of a 90-day period. <br /> Topsoil and Revegetation <br /> Surface soil stabilization will only include grass seeding of selected disturbed areas. In addition <br /> to grass seeding, other surface stabilizing materials may be used, as discussed above. No tree or <br /> shrub planting is planned as part of the mine reclamation. Where required, topsoil will be <br /> replaced to a depth of six inches or greater after rough grading is completed. The same dressing <br /> will be used for areas where stockpiles, access roads, or mining structures have been removed <br /> and the underlying material has been scarified in preparation for revegetation. As an area is <br /> reclaimed, runoff or excess water from adjacent areas will not be allowed to flow over slopes <br /> being graded and seeded. If needed,berms or channels will be constructed to divert excess water <br /> and dispose of it in a safe and non-erosive manner. <br /> Seeding of revegetation areas will be done as areas are finished with preparation including rough <br /> grading and topsoil placement. Planting will be most successful if done between mid-November <br /> and the end of April. Planting before November is not advised as the potential for a warm growth <br /> environment and early germination would likely result in a major failure of the revegetation and <br /> require reseeding. <br /> Drill seeding is the preferred method for revegetation. Grass seed should be planted with a drill <br /> equipped with depth bands and press wheels. Broadcast seeding is not advisable as seed burial <br /> could be limited. If broadcast seeding is necessary on moist soils, steep slopes, or in excessively <br /> rocky areas, success can be encouraged by broadcasting onto topsoil that is very loose, such as <br /> occurs immediately after spreading. If the seed is broadcast in those circumstances, then the <br /> seeded area will be dragged to help bury the seed. <br /> At this time, no mulch or fertilizer is being proposed. If necessary, fertilizer may be applied to <br /> re-soiled and seeded areas in a manner that will encourage emergence and survival of the grasses <br /> without encouraging competition from weeds. Starter fertilizer could be applied before, or at the <br /> time of, seeding. If necessary, full fertilization can be applied after emergence. However, any <br /> Timnath Connell Ptt <br /> DRMS 112 Permit Amendment Application Page 13 <br />