opez Dam is a zoned earth embankment with a hydraulic height of 166 feet, impounding a 52,500 acre-foot reservoir that provides water to five downstream communities. The dam contains a central clay core constructed on bedrock, with gravel upstream and random fill downstream shells founded on alluvial deposits. The alluvium varies in thickness in the treatment area from 15 feet at the abut- ments to as deep as 105 feet at the center of the old ri

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