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• <br />SHANNON F~WILSON. INC. <br />EXECUTIVE SUMMARY <br />The east and west permanent excess spoil fills (Figure 2) classify as valley fills. The <br />stability of these valley fills is relatively good and meets regulatory requirements. <br />2. The potential landslide areas (Figure 4) do not affect the stability of the proposed excess <br />spoil fills. <br />3. A drain system is required below the valley fills. The drain should be constructed in the <br />valley bottom and extend from the toe to near the head of the fill (Figure 5). <br />4. Lateral drains should be constructed in areas where seeps or springs have been identified <br />(Figure 5) and should connect into the main drain system in the valley bottom. <br />5. Surface drainage should be designed per regulations. Benches are not required for <br />stability, but can be considered to control erosion. <br />6. A water monitoring well is recommended near the toe of the fill. The monitoring well <br />should be located near the centerline of the valley, be at least 100 feet in elevation above <br />• the toe, and extend down through the spoil and natural soils to at least 20 feet into <br />bedrock. A bench for access to install and monitor the well should be provided. <br />7. Fill and drain construction should be monitored and reported as required by CDMG <br />regulation. <br />L~ <br />23-1-01105-200-Rl.doc <br />23-1-01105-200 <br />