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• <br />EXECUTIVE SUMMARY <br />7. We understand additional drilling of the X -Seam is likely. Prior to construction of the <br />• spoil fill, we should review updated elevation contours to confirm the bedrock dip in our <br />analysis remains appropriate. <br />1. The results of our investigation and analysis indicate the Collom Temporary Spoil Fill <br />meets CMLRD regulatory requirements for long term and seismic stability. <br />2. A drain system is recommended below the valley fill. The main valley drain should be <br />constructed in the valley bottom below the lower one -half of the valley under the fill. <br />The drain should extend from the toe to the upper mapped seep (Figure 4). <br />3. Lateral drains should be constructed in areas where seeps or springs have been identified <br />(Figure 4) and should connect into the main drain system in the valley bottom. <br />4. Benches are not required for stability, but can be considered to control erosion. <br />5. A water monitoring well is recommended near the toe of the fill. <br />6. Fill and drain construction should be monitored and reported as required by Colorado <br />Division of Minerals and Geology regulation. <br />8. Short term stability of the initial spoil lifts located over the valley bottom may be <br />marginal. Additional analysis and is recommended to evaluate alternatives and develop <br />contingency plans. <br />0 <br />9. A settlement monitoring point is recommended in the crest of the sediment pond <br />embankment. This should be monitored about every 3 month through the first year after <br />construction. <br />23- 1- 01101 - 400- R1.docx/wp /Ilm <br />23 -1- 01101 -400 <br />Exh. 23 -1 -5 Revision Date: 08/05/09 <br />Revision No.: PR -03 <br />