BOARD AGENDA MEMORANDUM
SUBJECT:
Title
Update on the Palo Alto Flood Basin Tide Gate Structure Improvements Project, Project No. 10394001 (Palo Alto, District 7). (Continued from January 28, 2020)
End
RECOMMENDATION:
Recommendation
Receive an Update on the Palo Alto Flood Basin Tide Gate Structure Improvements Project.
Body
SUMMARY:
Background:
The Palo Alto Flood Basin (PAFB) Tide Gate Structure was constructed in 1957 by the Santa Clara County Flood Control and Water Conservation District, Santa Clara County, and the City of Palo Alto. A map of the PAFB is included as Attachment 1.
In September 2012, Santa Clara Valley Water District (Valley Water) completed emergency repairs to stop seepage flow beneath the structure under U.S. Army Corps of Engineering (USACE) Regional General Permit #5. As part of that effort, staff submitted a post construction report to USACE which detailed the emergency work and attached evidence of initiation of a capital project to replace the existing tide gate structure within 5 years.
In 2014, Valley Water engaged the services of Mark Thomas & Co (MT) to perform structural inspections and prepare an assessment report for the tide gate structure. The report concluded that the structure was in generally good condition and recommended approximately $180,000 in minor structural repairs.
In 2017, Valley Water contracted a construction contractor to perform minor maintenance repairs; however, the work was complicated due to cracks in the bottom slab and stopped during the dewatering process. A subsequent letter prepared by MT in October 2017 recommended the structure be replaced in the next couple of years.
In 2018, Valley Water management directed a new team to complete planning, design, and construction of a new tide gate structure.
On January 8, 2018, the project team met with the City of Palo Alto to coordinate ongoing efforts and next steps. The team discussed Project alignment with the San Francisquito Creek Joint ...
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