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Sunnyside Basin M-77-378 <br /> Page 2 <br /> RECLAMATION PLAN: <br /> The goal will be to decrease the amount of near surface groundwater <br /> entering the Sunnyside Mine through the backfilled Lake Emma hole <br /> at the backfill-rock contact. Surface water infiltration will be <br /> minimized by the reclamation plan for the hole (ie. sloped top with <br /> an under-layer of clay) . <br /> The goal will be accomplished by excavating surface ditches to <br /> bedrock contact where possible and diverting the intercepted water <br /> to the rock trench south of the backfilled Lake Emma hole. The <br /> rock trench is the deepened former outlet for Lake Emma. The <br /> intercepted water will be diverted to the rock trench either by <br /> open ditch or by a buried drain pipe system or combination of both. <br /> The decision to use a drain pipe or an open ditch or nothing (just <br /> backfill the excavation) will be a field decision based on; <br /> 1) the depth of the rock contact. <br /> 2) the amount of groundwater flow intercepted. <br /> 3) whether expected surface runoff can be accommodated with an <br /> open ditch without major erosion control construction features . <br /> A phased approach will be taken towards reaching the above goal . <br /> Each additional phase will only be undertaken if field evaluations <br /> confirm feasibility and is warranted (judged by the remaining <br /> quantity of groundwater entering the Sunnyside Mine through the <br /> former Lake Emma hole) . The separable phases in order of <br /> feasibility and planned construction are listed below and shown on <br /> plate 1. <br /> Phase Location In Relation To Lake Emma Hole <br /> 1 Northeast (460 feet of Profiled Length) <br /> 2 East to Southeast towards rock trench <br /> 3 Northwest to Northeast <br /> 4 West to Southwest towards rock trench <br /> General Specifications <br /> Ditch - See Figure 1 for typical section. <br /> Slope - The profile of the ditch (es) will depend on the contour <br /> of the bedrock contact and surface topography. A minimum <br /> slope of 2% will be maintained by following the bedrock <br /> contact and blasting the ditch bottom to grade where <br /> required. No maximum grade will be maintained. Erosion <br /> should not be a problem as the ditch invert will be on <br /> the rock contact. <br />