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CM0001643 <br />Page 15 <br />Construction of haul roads to support sludge removal; <br />• Removal of the 1.4 mcy of sludges by excavation and hauling to Robinson <br />Tailing Pond; <br />• Reclamation of haul roads used for excavation; <br />Revegetation of disturbed areas; and <br />Placement of rip-rap along the dam face and shoreline for aesthetics. <br />The cost estimate assumes that Robinson Lake can be drained using the existing pump house <br />t and conveyance lines. The time to complete active reclamation is estimated to be 73 days. <br />To be effective, active reclamation of Robinson Lake will need to be combined with elimination <br />of poor quality surface water discharges from Tenmile Tunnel and West Tailing Delivery Line, <br />and a reclamation measure to address the No. 1 Tailing Dam seep water. These costs are not <br />included in the cost estimate provided. <br />Passive Reclamation <br />Passive reclamation of Robinson Lake will rely on "wet storage" of the lake sludges and natural <br />flushing to improve water quality. Therefore, the costs associated with passive reclamation will <br />only be for rip-rap placement for aesthetic improvements. The estimated cost to rip-rap Robinson <br />Lake upstream dam face and shorelines ranges between $20,900 to $24,800. The estimated time <br />to place rip-rap along the Robinson Lake dam and shore is approximately 3 days. <br />To be effective, passive reclamation of Robinson Lake will need to be combined with elimination <br />of poor quality surface water discharges from Tenmile Tunnel and West Tailing Delivery Line, <br />and a reclamation measure to address the No. 1 Tailing Dam seep water (either active or passive). <br />These costs are not included in the cost estimate provided. <br />Y <br /> <br />ri,_ <br />L <br />4.4 No. 1 Tailing Dam Seep Water <br />Two reclamation measures were presented to address the No. I Tailing Dam seep water: physical <br />containment and passive treatment. Either approach can be used in conjunction with the Robinson <br />Lake reclamation. <br />Physical Containment <br />Physical containment of the No. 1 Tailing Dam seep water will require the construction of a 180 <br />Environmental <br />• <br />• <br />•