BOARD AGENDA MEMORANDUM
SUBJECT:Title
Approve the Relocation Impact Study and Last Resort Housing Plan for the Anderson Dam Tunnel Project as Part of the Federal Energy Regulatory Commission Order Compliance Project, Under the Anderson Dam Seismic Retrofit Project, Project No. 91864006. (Morgan Hill, District 1).
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RECOMMENDATION:Recommendation
Approve the Relocation Impact Study and Last Resort Housing Plan for the Anderson Dam Tunnel Project as part of the Federal Energy Regulatory Commission Order Compliance Project, under the Anderson Dam Seismic Retrofit Project.
Body
SUMMARY:
Santa Clara Valley Water District (Valley Water) is undertaking the Anderson Dam Federal Energy Regulatory Commission Order Compliance Project (FOCP) as a result of the February 20, 2020, directive from the Federal Energy Regulatory Commission (FERC) to implement interim risk reduction measures at Anderson Dam. The Anderson Dam Tunnel Project (ADTP), Project No. 91864006, is one of five Capital Construction Projects comprising the FOCP. The ADTP is currently being constructed and includes building a diversion system to augment the existing outlet, consisting of a new diversion tunnel, an outlet structure, a micro-tunnel lake tap, and modifications to Coyote Creek just downstream of the base of the dam. The ADTP also includes reservoir bank and rim stability improvements, and existing intake structure modification.
The purpose of the ADTP reservoir bank and rim stability improvements is to address ground movement associated with pre-existing landslide areas around Anderson Reservoir. One of the landslide areas that requires stabilization is known as the "Hoot Owl Way Landslide," located on the reservoir slope below Hoot Owl Way in the Holiday Lake Estates community. Slope movements at the Hoot Owl Way Landslide have been documented in the past during reservoir operations, seismic events, and other drought and flood related circumstances, and were monitored during the drawd...
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