San Juan Water District has cathodic protection/monitoring systems connected to following facilities
o Cooperative Transmission Pipeline (CTP)
o Fair Oaks 40" Pipeline
o Auburn Folsom 24" Pipeline
o WTP Raw Water Pipelines
o Treated Water Pipelines at the WTP
o Los Lagos Tank The purpose of the Corrosion Monitoring System condition assessment and testing program will be to:
o Determine the current status of the existing corrosion testing systems,
o Determine if any repairs or replacements are needed on the existing corrosion testing and monitoring system, and on the existing cathodic protection system,
o Determine if the mortar lined and coated pipelines are actively corroding by using the existing corrosion testing system,
o Determine the functionality of the various electrical isolation fittings that are installed on the system,
o Determine if there are any other utilities that have been installed since the facilities were constructed that may be inducing AC current or any other interference from a foreign structure
that may contribute to any adverse corrosion effect on the facility.
o Determine if any corrosion testing, monitoring or protection system updates or new facilities are recommended for the CTP to provide economic benefit towards extending the life of the
pipeline.
The assessment study will involve the rectifiers, test stations, joint isolation stations, etc. as defined in Exhibit B attached. The scope of services tasks will, at a minimum, include the following:
1. Review the available pipeline as-built drawings and documents.
2. Inspect the condition of the accessible corrosion monitoring system components.
3. Measure and record the pipe-to-soil potentials at each of the test stations.
4. Assess the electrical isolation of the pipelines from other pipelines and utilities.
5. Prepare and submit a final summary report that will include the following elements:
a. Description of the goals and objectives.
b. Summary description of the field-testing procedures employed for the project.
c. Tabulation of the testing results.
d. Analysis of the testing results and observations.
e. Conclusions about the operational condition of the corrosion system, the test stations, and other systems.
f. Recommendations on any necessary repairs, upgrades, and improvements for the corrosion protection and monitoring systems.
g. Recommendations for future monitoring and testing frequency.
h. Cost estimates for recommended corrosion system monitoring and protection system improvements.
i. Projection of remaining pipeline life based on the available information, testing and
inspection results, and expert opinion.
j. Appendix containing copies of testing and investigation documents including but not necessarily limited to drawings, details, surveys, forms, data, and analysis.
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