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(.,.; CM0001642 <br />E <br />Page 14 <br />Reclamation Measure #2 <br />Reclamation measure #2 consists of raising the Eagle Park Reservoir. Dam to increase the <br />reservoir storage from 3,000 acre-feet to 6,000 acre-feet. Raising the dam from an elevation of <br />10,725 feet msl to 10,770 feet msl will require excavating the exiting dam structure to access the <br />impervious core. Once the core is accessed, approximately 1.8 million cubic yards of soil will <br />be needed to raise the dam to the design height. <br />The estimated cost range for raising the Eagle Park Reservoir Dam will be from $4,740,000 to <br />$5,620,000. This cost assumes that a sufficient quantity and quality of borrow material is <br />available within the local area. It also includes a cost to revegetate the borrow areas. <br />The estimated time to raise the dam is approximately 166 days. <br />..1 <br />4.2 Robinson Lake Drain <br />The cost estimate for excavation and placement of the Robinson Lake drain ranges between <br />$16,800 to $38,000. The "low-end" cost represents the drain without a cutoff wall while the <br />"high-end" cost includes a cutoff wall. <br />Since the primary objective of the drain is to protect the Eagle Park Reservoir from being <br />impacted by poor quality water, it is recommended that the optional cutoff wall be included in <br />the Robinson Lake drain design. The cutoff wall provides an additional factor of safety for <br />protecting the Eagle Park Reservoir. <br />The estimated time to construct the drain is approximately 1.2 days. This time estimate assumes <br />the materials and equipment are available at the site. This estimate does not include the time to <br />construct a slurry wall, as the site conditions can dramatically impact scheduling. <br />4.3 Robinson Lake Reclamation <br />1 A presented in Section 3.0, two reclamation measures were evaluated for Robinson Lake, active <br />and passive. Active reclamation will entail removal and disposal of lake sludges in a similar <br />fashion to the Eagle Park Reservoir. Passive reclamation will center on wet storage of the lake <br />i sludges. As discussed in Section 3.1.3, sludge characterization is the critical component for <br />selection of which reclamation measure should be used at Robinson Lake. <br />Uil <br />Active Reclamation <br />The cost to actively reclaim Robinson Lake is estimated to range between $3,650,000 to <br />t $4,300,000. This cost includes: <br />"'TIMm =M Environmental