Seismic Stability Evaluation of Folsom Dam and Reservoir Project. Report 8.Mormon Island Auxiliary Dam. Phase 2. Revision

摘要

The man-made water retaining structures at the Folsom Dam and Reservoir Project,located on the American River about 20 miles upstream of the City of Sacramento, California, have been evaluated for their seismic safety in the event of a Magnitude 6.5 earthquake occurring on the East Branch of the Bear Mountains Fault Zone at a distance of about 15 km. This report documents the Phase II study of Mormon Island Auxiliary Dam, one of the zoned embankment dams at the Folsom Dam and Reservoir Project. The evaluation process involved extensive review of construction records, field and laboratory investigations, and analytical studies. It has been determined that the portion of Mormon Island Auxiliary Dam founded on rock or undisturbed alluvium will perform satisfactorily. Evaluation of the remaining portion of the dam, founded on dredge tailings, is documented in Report 4 of this series.