BOARD AGENDA MEMORANDUM
SUBJECT:
Title
Report of Bids Received, Award of Construction Contract to Alisto Engineering Group, Inc. for the Installation of Cathodic Protection Rectifiers and Deep-Well Anodes on the Santa Clara Conduit Project, Project No. 91214010, Contract No. C0632 (Unincorporated County), (District 1).
End
RECOMMENDATION:
Recommendation
A. Ratify Addenda Nos. 1, 2, and 3 to the Contract Documents for the Installation of Cathodic Protection Rectifiers and Deep-Well Anodes on the Santa Clara Conduit Project;
B. Award the Contract to Alisto Engineering Group, Inc., of Walnut Creek, CA in the sum of $244,400; and
C. Approve a contingency sum of $36,600 (15%) and authorize the Chief Executive Officer or designee to approve individual change orders up to the designated amount.
Body
SUMMARY:
The San Felipe System transports raw water from San Luis Reservoir to Santa Clara and San Benito Counties. The District is responsible for the operation and maintenance of the system pursuant to a written agreement with United States Bureau of Reclamation (Reclamation). The Santa Clara Conduit is an integral portion of the San Felipe System; it is comprised of 20 miles of 96-inch diameter pre-stressed concrete cylinder pipe (PCCP), a material known to be susceptible to corrosion.
Cathodic protection is an electrochemical means of corrosion control and is a proven method to protect and extend the useful life of pipelines and appurtenances. The Santa Clara conduit was provided with a corrosion monitoring system when it was built in the 1980's, but not with a cathodic protection system. At that time, pre-construction resistivity testing indicated that the conduit was installed in a relatively non-corrosive environment. However, it has since been learned that corrosion of steel pre-stressed wires of PCCP can be arrested by application of cathodic protection to the pipeline, to reduce the risk of failures.
The proposed Project involves the installati...
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