BOARD AGENDA MEMORANDUM
SUBJECT:
Title
Agreement with GEI Consultants, Inc., for Engineering Services for the Lenihan and Stevens Creek Dams Safety Evaluations and Budget Adjustment for Supplemental Tasks for the Dam Seismic Stability Evaluations Project, Project No. 91084019 (Los Gatos, Cupertino) (District 7).
End
RECOMMENDATION:
Recommendation
A. Approve a budget adjustment transferring an amount not-to-exceed $1,700,000 from the Almaden Dam Improvements Project (Project No. 91854001) to the Dam Seismic Stability Evaluations Project (Project No. 91084019) to fund the Lenihan and Stevens Creek Dams Safety Evaluations; and
B. Approve the Agreement with GEI Consultants, Inc., for engineering services for the Lenihan and Stevens Creek Dams Safety Evaluations for a not-to-exceed fee of $2,453,283.
Body
SUMMARY:
In April 2017, the Governor of California ordered detailed evaluations of large spillway structures at all high-hazard dams, including at Lenihan and Stevens Creek dams. The District's consultant will be performing comprehensive spillway and dam safety evaluations of these two dams to provide engineering studies that support District decisions to resolve potential spillway risks.
The Lenihan and Stevens Creek Dams Safety Evaluations (Project) will include preliminary data collection, comprehensive spillway condition assessments in accordance with Division of Safety of Dams (DSOD) requirements, updated Probable Maximum Flood studies to address adequacy of the spillway and freeboard capacity, spillway hydraulics computer fluid dynamics, Potential Failure Mode Analysis, dam outlet inspections, and Supporting Technical Information Document for the two dams included in this Project. An Independent Dam Safety Review (IDSR) will help identify other critical needs and deficiencies relevant to the two dams. Supplemental engineering services as a follow-up to the recommendations in the IDSR report may also be performed.
Comprehensive spillway condition ...
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