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Home My WebLink AboutItem 5b. Cathodic Protection Study of the Whale Rock PipelineCity of San Luis Obispo, Title, Subtitle Whale Rock Commission Report Whale Rock Commission Meeting – May 8, 2025 Agenda Item 4 – Cathodic Protection Study, Whale Rock Pipeline FROM: Aaron Floyd, Utilities Director PREPARED BY: Noah Evans, Whale Rock Supervisor SUBJECT: Cathodic Protection Survey of the Whale Rock Pipeline RECOMMENDATIONS No action is requested of the Commission for this update/presentation. DISCUSSION Cathodic protection prevents corrosion in metal structures, such as pipelines and tanks, by applying a low electrical current. This method has been utilized since the 1930s. We use sacrificial cathodic protection for the Whale Rock pipeline , where magnesium sulfide acts as the anode, corroding in place of the pipeline to protect it. In January, our team collaborated with a specialized consultant to conduct a comprehensive survey of Whale Rock's cathodic protection system (CPS). The survey's objective was to assess the effectiveness of the CPS by measuring pipeline- to-soil electrical flows against established industry standards at various points along the pipeline. Key factors influencing the performance of the CPS, including electrical isolation, interference, and continuity, were evaluated. SACRIFICIAL ANODE CATHODIC PROTECTION SYSTEM Page 15 of 141 City of San Luis Obispo, Title, Subtitle Whale Rock Commission Report Whale Rock Commission Meeting – May 8, 2025 Agenda Item 4 – Cathodic Protection Study, Whale Rock Pipeline The consultant's report provides the following recommendations aimed at enhancing the functionality of the CPS: Recommendations: 1. Replacement of Anodes: Seventeen anodes require replacement. Anodes are sacrificial components that protect the pipeline from corrosion by corroding themselves. Anodes are wired to the pipeline and buried nearby. The replacement process will involve excavation, installation of new anodes, and backfilling of the excavated areas. 2. Installation of Electrical Isolators: To improve performance and eliminate any risk of interference with the City of San Luis Obispo Water Treatment Plant's metal pipes, electrical isolators will be installed between the Whale Rock pipeline and the Water Treatment Plant. 3. Re-establishment of Anode and Test Station Connections: Connections between the anodes and test stations will be re -established at eleven specific locations. This will enable assessing anode performance at these sites, some of which may require new anode installations. 4. Installation of Additional CPS Test Stations: Six additional CPS test stations will be installed along the pipeline. Currently, there are no CPS test stations between Pump Station B and the SLO Water Treatment Plant, which spans approximately four miles. Staff plans to re-establish the anode-to-test station connections (Report Recommendation #3) over the coming months and to install the six additional CPS test stations (Report Recommendation #4) during the summer. Additionally, staff will develop a project for the Commission's future consideration to address Recommendations 1 and 2. ATTACHMENTS: A - Cathodic Protection Survey Whale Rock Pipeline Page 16 of 141 ACUUS-J212126-RSV-0.0 Page | ii 2025-03-05 Rev. Date Issued For Summary of Changes Originator Reviewer Approver 0 2025-03-05 Review First Issue Jason Riggins Senior CP Technician US CP Division Lisseth Ocando Corrosion Engineer US CP Division Matthew Buchynski Engineering Manager US CP Division 2025 Whale Rock 30” Waterline Cathodic Protection Survey Report – Cathodic Protection Services Issued To: City of San Luis Obispo Prepared By: Acuren Inspection Inc. Issue Date: 2025-03-05 Document ID: ACUUS-J212126-RSV-0.0 Page 17 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 Page | iii 2025-03-05 Table of Contents PURPOSE ....................................................................................................................... 1 CRITERIA ........................................................................................................................ 1 RECOMMENDATIONS .................................................................................................... 2 SYSTEM DESCRIPTION ................................................................................................... 3 4.1 CURRENT SOURCES ....................................................................................................... 3 4.2 TEST STATIONS .............................................................................................................. 5 RESULTS ......................................................................................................................... 6 5.1 STATUS OF CATHODIC PROTECTION .............................................................................. 6 5.2 SYSTEM REPAIRS ........................................................................................................... 6 5.3 ELECTRICAL ISOLATION ................................................................................................. 6 5.4 ELECTRICAL CONTINUITY AND INADEQUATE CATHODIC PROTECTION ......................... 6 5.5 SUMMARY ..................................................................................................................... 7 List of Tables Table 1: Rectifier Output .............................................................................................................. 3 Table 2: Galvanic Anode Output .................................................................................................. 4 Table 3: Repairs Performed .......................................................................................................... 6 Table 4: Project Details ................................................................................................................. 7 List of Figures Figure 1: Test Station Location ..................................................................................................... 5 Appendices Appendix 1: Cathodic Protection Summary of Deficiencies Appendix 2: Rectifier and Groundbed Data Appendix 3: Structure-to-Electrolyte Potential Data Appendix 4: Rectifier Surveillance Form Appendix 5: List of Drawings Appendix 6: Cathodic Protection Photo Log Page 18 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 Page | 1 2025-03-05 ATTENTION: Noah Evans RE: 2025 CATHODIC PROTECTION SURVEY REPORT CITY OF SAN LUIS OBISPO – WHALE ROCK 30” WATERLINE Authorization to proceed with the 2025 cathodic protection (CP) survey for the Whale Rock 30” Pipeline was received electronically from Noah Evans. Acuren Inspection Inc. (Acuren) personnel conducted the fieldwork between January 21, 2025 and January 23, 2025 to assess the status of the CP system. PURPOSE The purpose of the survey was to evaluate the effectiveness of the CP system(s) by measuring structure-to-electrolyte potentials against established industry criteria at all points of access as per CFR Title 49, Part 195 Transportation of Hazardous Liquids by Pipeline. Additionally, critical elements which influence the performance of a CP system, such as electrical isolation, electrical interference, and continuity were evaluated. Any encountered deficiencies have been recorded in this report. Minor repairs were completed where required and any remedial work identified to ensure optimal performance of the CP system(s). CRITERIA To evaluate the effectiveness of CP systems, structure-to-electrolyte potential measurements are recorded from all design structures and assessed against industry recognized criteria. Accepted standards for the control of external and internal corrosion include, but are not limited to:  NACE SP0169-2024: Control of External Corrosion on Underground or Submerged Metallic Piping Systems The accepted criteria for corrosion control of buried or submerged steel structures in the above standard(s) is generally defined as one of the following:  A minimum of 100 mV of cathodic polarization. Page 19 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 Page | 2 2025-03-05  A polarized structure-to-electrolyte potential of -850 mV or more negative measured with respect to a copper/copper sulphate reference electrode. Use of the 100-mV criterion requires the measurement of either the formation or decay of polarization. Measuring the formation of polarization requires an accurate static potential reading for comparison at each test location. Static potentials can only be collected when CP system(s) have been turned ‘OFF’ for a sufficient period to allow for complete depolarization. Measuring the decay of polarization requires the establishment of polarized potentials with all CP systems electrically continuous with an asset turned ‘ON’. Polarization decay can then be measured by turning off all applicable CP current sources. In some circumstances, environmental factors may affect cathodic polarization behavior, requiring specific adjustments to the applicable criteria for adequate CP. Where non-ferrous metals are present, adjustments to the criteria are necessary to preserve the external integrity of the buried metal structure. Extensions of the criteria for these specific situations are further described in the applicable standard(s). RECOMMENDATIONS The following are recommended in order to achieve optimum levels of CP for the Whale Rock pipeline: • Ensure that the remedial work outlined on the attached “Summary of Deficiencies” is completed and notify Acuren as soon as practical if a re-evaluation of the problem area(s) is desired. • Continue to operate the impressed current CP system(s) at their respective target current outputs. Ensure the rectifier readings are recorded on a bi-monthly basis. • Ensure that the galvanic anode system(s) are monitored on a periodic basis and the data collected is stored properly for reference. • Ensure adequate access is available to all locations during the annual CP survey. • Consider utilizing Acuren’s pipeline integrity services (Indirect Inspection, ECDA) for any length of pipeline where coating condition, burial depth, or CP potentials are of concern. Page 20 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 Page | 3 2025-03-05 • Notify Acuren of any changes, additions, or modifications to the facility operation which may impact the operation of the CP system(s) or the status of CP on any protected structures. • Authorize Acuren to complete the annual CP survey of the facilities in 2026. SYSTEM DESCRIPTION The Whale Rock - Pump Station facilities assets (inlet/outlet headers) are protected by impressed current cathodic protection (ICCP) systems. Specific details concerning the ICCP system design were not available at the time of the survey. The 30” Whale Rock waterline is protected by a series of galvanic anode placements. 4.1 CURRENT SOURCES The status and output of the rectifier(s) in the Whale Rock – Pump Station facilities is listed in ‘Table 1’. It is recommended that the rectifier(s) operate within their target current output(s) to ensure optimum performance of the CP system(s). Specifications and operational data for each rectifier can be found in “Appendix 2”. TABLE 1: RECTIFIER OUTPUT Rectifier Description Location Target Output (A) Actual Output (A) Notes Alpha Pump Station A 0.4-0.6 0.5 Protects Inlet & Outlet Headers Bravo Pump Station B 0.6-0.8 0.7 Protects Inlet & Outlet Headers The location and status of the galvanic anodes along the 30” Whale Rock pipeline is listed in ‘Table 2’. Of the 20x anode test stations detailed only 2x locations have active anode connections with potentials showing an influence of cathodic protection. Anode test station deficiencies are detailed in the deficiency summary found in “Appendix 1”. Page 21 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 Page | 4 2025-03-05 TABLE 2: GALVANIC ANODE OUTPUT Galvanic Anode Description Location Anode Output (mA) Notes Magnesium 10+00 0.0 Anode disconnected Magnesium 71+30 0.0 Anode depleted Magnesium 96+30 0.0 Anode depleted Magnesium 96+30 0.0 Anode disconnected (Rear) Magnesium 130+00 NR Anode present and functional Magnesium 157+00 0.0 Anode disconnected Magnesium 165+00 0.0 Anode depleted Magnesium 180+25 0.0 Anode(s) disconnected Magnesium 207+00 0.0 Anode(s) disconnected Magnesium 227+00 0.0 Anode depleted Magnesium 295+05 0.0 Anode disconnected Magnesium 300+00 NR Anode present and functional Magnesium 310+90 0.0 Anode disconnected Magnesium 313+90 0.0 Anode(s) disconnected Magnesium 397+25 0.0 Anode(s) disconnected Magnesium 515+00 0.0 Anode disconnected Magnesium 559+30 0.0 Anode depleted Magnesium 579+00 0.0 Anode disconnected Magnesium 602+50 0.0 Anode disconnected Magnesium 602+50 0.0 Anode disconnected (Rear) Page 22 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 Page | 5 2025-03-05 4.2 TEST STATIONS Test stations are essential pieces of monitoring equipment for evaluation of the performance of a CP system. Test stations can provide additional CP data at locations where no other above ground structures are present for measurement. It is recommended that test stations remain in good working order to facilitate future data collection during annual surveys. Test stations deficiencies should be addressed according to the priority rating in “Appendix 1”. Figure 1 shows the actual view of the location of these test stations. FIGURE 1: TEST STATION LOCATION – ACTUAL VIEW Test station placement along the 30” Whale Rock waterline begin at station# 10+00 and end at station# 602+50. There are no additional test station locations between Pump Station “B” and the termination of the waterline at the regional treatment plant, approximately 4.5 miles. Page 23 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 Page | 6 2025-03-05 RESULTS 5.1 STATUS OF CATHODIC PROTECTION The impressed current cathodic protection systems for Pump Station A & B showed moderate levels of CP, assets meet 100mV criteria. The galvanic anode cathodic protection systems for the 30” Whale Rock waterline showed inadequate levels of CP; CP levels are expected to improve once the deficiencies noted in 4.1 are addressed. 5.2 SYSTEM REPAIRS Minor repairs to the CP system were completed during the 2025 survey where possible. Repairs completed are summarized in ‘Table 3’. TABLE 3: REPAIRS PERFORMED Asset Repaired Location Deficiency Description Repair Performed TR-Alpha Pump Station A Rectifier (Alpha) has a broken negative structure cable. Established structure negative 5.3 ELECTRICAL ISOLATION Electrical isolation devices are placed strategically along the 30” Whale Rock waterline to prevent current drains to unintended structures, that could detrimentally affect the operation of the CP system(s). Electrical isolation devices should be repaired or installed according to the isolation deficiencies in “Appendix 1”. All procured isolation devices should be rated for oil and gas environments, the appropriate services temperature and pressure rating, and their specific application. 5.4 SUMMARY At the time of the survey, the majority of the below ground design structures were not receiving adequate CP as defined by NACE SP0169-2024 to mitigate external corrosion. “Appendix 1” outlines the system repairs, modifications, and upgrades recommended at this time. Page 24 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 Page | 7 2025-03-05 Once the recommended repairs are completed, facilities requiring CP should be adequately protected. ‘Table 6’ outlines the dates and personnel responsible for this project. TABLE 4: PROJECT DETAILS Project Dates: Field: January 21, 2025 to January 23, 2025 Office: February 15, 2021 to March 5, 2025 Personnel : Field: - Jason Riggins, Senior CP Technician Office: - Jason Riggins, Senior CP Technician - Lisseth Ocando, Corrosion Engineer - Matthew Buchynski, Engineering Manager Acuren appreciates the opportunity to have completed this project and looks forward to working with you again in the future. Should there be any questions, comments, or concerns regarding the contents of this report, please contact the undersigned. Respectfully, ACUREN INSPECTION INC. Matthew Buchynski, P.Eng., NACE CP3 Technologist Engineering Manager – US CP Phone: (587) 217-0466 Email: matthew.buchynski@acuren.com Page 25 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 2025-03-05 APPENDIX 1: CATHODIC PROTECTION SUMMARY OF DEFICIENCIES Page 26 of 141 CITY OF SAN LUIS OBISPO Priority: WHALE ROCK - CATHODIC PROTECTION SURVEY 1 - Deficiency causes asset to not meet criteria. Asset out of compliance. SUMMARY OF DEFICIENCIES 2 - Deficiency is not causing negative effects to asset at present but may in future. 2025 CP SURVEY - 30" WATERLINE 3 - Deficiency impacts the completion of the intended scope of work. Deficiency ID Test Point ID Deficiency Type Priority Asset ID Description Recommended Action Cost Estimate Action Assigned To Additional Reference Deficiency Status Target Completion Date Actual Completion Date Comments SOL-0001 Electrical Insulation 1 Conveyance conduit is shorted to piping system of the water treatment plant. This issue is a concern and is reduce the life of the CP systems and lowering CP protection levels on the water system. Recommended to install permanent isolators and remeasure to ensure total isolation and improved mechanical connection. City of San Luis Obispo Water Treatment Facility Incomplete 2025/12/30 2024/10/14 SOL-0002 System Inadequate Monitoring 2 Water Piping System Missing multiple periods of rectifier operational data. Synchronous interruption require to gather reliable IR free potentials required. Install Remote Monitoring Units at each of the three operational rectifiers or establish a bi- monthly rectifier inspection/reporting program. SOL/Acuren Monitor 2025/12/30 Acuren to provide proposal SOL-0003 System Inadequate Reference Information 2 Facility System drawings are missing updates and MOC information. Redline and update drawings after completion of deficiency remediation, circuit reconfiguration, and annual survey. Draft updates and install printed copies in rectifiers/JBs. SOL/Acuren Incomplete 2025/03/30 Acuren to provide proposal SOL-0004 System Rectifier/Groundb ed 1 TR‐Alpha Rectifier (Alpha) has a broken negative structure cable. Rectifier is functional, but not connected to inlet/ outlet headers. Establish structure negative, energize ICCP system and allow to polarize. Update system documentation to reflect system changes. Acuren Pump Station A Complete 2025/01/22 2025/01/23 Completed as part of project SOL-0005 System Inadequate Cathodic Protection 1 TR‐Bravo Test point not meeting 100mV / 850mV criterion. Adjust system output. Update system documentation to reflect system changes. Acuren Pump Station B Complete 2025/01/22 2025/01/23 Completed as part of project SOL-0006 TP 10+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Re-establish galvanic anode connection and allow to polarize.Acuren Monitor 12/30/2025 SOL-0007 TP 48+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0008 TP 63+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0009 TP 65+85 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0010 TP 71+30 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0011 TP 96+30 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Re-establish galvanic anode connection and allow to polarize.Acuren Monitor 12/30/2025 SOL-0012 TP 139+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0013 TP 143+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0014 TP 157+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Re-establish galvanic anode connection and allow to polarize.Acuren Monitor 12/30/2025 SOL-0015 TP 160+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0016 TP 165+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0017 TP 176+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 Page 27 of 141 CITY OF SAN LUIS OBISPO Priority: WHALE ROCK - CATHODIC PROTECTION SURVEY 1 - Deficiency causes asset to not meet criteria. Asset out of compliance. SUMMARY OF DEFICIENCIES 2 - Deficiency is not causing negative effects to asset at present but may in future. 2025 CP SURVEY - 30" WATERLINE 3 - Deficiency impacts the completion of the intended scope of work. Deficiency ID Test Point ID Deficiency Type Priority Asset ID Description Recommended Action Cost Estimate Action Assigned To Additional Reference Deficiency Status Target Completion Date Actual Completion Date Comments SOL-0018 TP 180+25 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Re-establish galvanic anode connection and allow to polarize.Acuren Monitor 12/30/2025 SOL-0019 TP 207+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Re-establish galvanic anode connection and allow to polarize.Acuren Monitor 12/30/2025 SOL-0020 TP 217+39.5 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0021 TP 227+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0022 TP 257+10 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0023 TP 295+05 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Re-establish galvanic anode connection and allow to polarize.Acuren Monitor 12/30/2025 SOL-0024 TP 310+90 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Re-establish galvanic anode connection and allow to polarize.Acuren Monitor 12/30/2025 SOL-0025 TP 313+90 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Re-establish galvanic anode connection and allow to polarize.Acuren Monitor 12/30/2025 SOL-0026 TP 358+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0027 TP 397+25 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Re-establish galvanic anode connection and allow to polarize.Acuren Monitor 12/30/2025 SOL-0028 TP 430+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0029 TP 461+47 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0030 TP 515+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Re-establish galvanic anode connection and allow to polarize.Acuren Monitor 12/30/2025 SOL-0031 TP 559+30 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0032 TP 579+00 Inadequate Cathodic Protection 1 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing galvanic anode at this location Acuren Monitor 12/30/2025 SOL-0033 TP 602+50 Inadequate Cathodic Protection 2 Water Piping System Test point not meeting 100mV / 850mV criterion. Re-establish galvanic anode connection and allow to polarize.Acuren Monitor 12/30/2025 SOL-0034 PLEX-03 Inadequate Cathodic Protection 2 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing anode test station.Acuren Pipeline Exposure Monitor 12/30/2025 SOL-0035 PLEX-04 Inadequate Cathodic Protection 2 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing anode test station.Acuren Pipeline Exposure Monitor 12/30/2025 SOL-0036 PLEX-05 Inadequate Cathodic Protection 2 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing anode test station.Acuren Pipeline Exposure Monitor 12/30/2025 SOL-0037 PLEX-06 Inadequate Cathodic Protection 2 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing anode test station.Acuren Pipeline Exposure Monitor 12/30/2025 Page 28 of 141 CITY OF SAN LUIS OBISPO Priority: WHALE ROCK - CATHODIC PROTECTION SURVEY 1 - Deficiency causes asset to not meet criteria. Asset out of compliance. SUMMARY OF DEFICIENCIES 2 - Deficiency is not causing negative effects to asset at present but may in future. 2025 CP SURVEY - 30" WATERLINE 3 - Deficiency impacts the completion of the intended scope of work. Deficiency ID Test Point ID Deficiency Type Priority Asset ID Description Recommended Action Cost Estimate Action Assigned To Additional Reference Deficiency Status Target Completion Date Actual Completion Date Comments SOL-0038 PLEX-07 Inadequate Cathodic Protection 2 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing anode test station.Acuren Pipeline Exposure Monitor 12/30/2025 SOL-0039 PLEX-08 Inadequate Cathodic Protection 2 Water Piping System Test point not meeting 100mV / 850mV criterion. Consider installing anode test station.Acuren Pipeline Exposure Monitor 12/30/2025 SOL-0040 Monitoring 3 Water Piping System Need 2025 "off" potential Interrupted 2026 Annual Survey Acuren Incomplete 1/30/2026 Acuren to provide proposal Page 29 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 2025-03-05 APPENDIX 2: RECTIFIER AND GROUNDBED DATA Page 30 of 141 CITY OF SAN LUIS OBISPO WHALE ROCK - CATHODIC PROTECTION SURVEY RECTIFIER INSPECTION DATA 2025 CP SURVEY - 30" WATERLINE Pr o j e c t N a m e Re c t i f i e r I D Re c t i f i e r L o c a t i o n D e s c r i p t i o n Se r i a l N u m b e r Mo d e l N u m b e r Ma n u f a c t u r e r Re c t i f i e r R e a d i n g D a t e Re a d i n g S t a t u s Ta p S e t t i n g s To t a l V o l t a g e ( V DC ) To t a l A m p e r a g e ( A ) Ci r c u i t R e s i s t a n c e ( Ω ) Fi e l d C o m m e n t s Co m m e n t s Sh u n t R a t i n g Ra t e d A C V o l t a g e 1 Ra t e d A C A m p e r a g e 1 Fu s e T y p e Nu m b e r o f S p a r e F u s e s As B u i l t S i t e S k e t c h Re c t i f i e r S c h e m a t i c Re c t i f i e r E x t e r n a l D i s c o n n e c t CP W a r n i n g S i g n s In s p e c t i o n C o m p a n y In s p e c t o r N a m e SLO WHALE ROCK ALPHA PSA - MCC 932321 ES Universal Rectifiers 2025-01-22 AF Cl F2 7.63 0 NR No current output Trace Neg. attachment 1mv/ 0.2A 20 5 AC 0 No No No No Acuren J. Riggins SLO WHALE ROCK ALPHA PSA - MCC 932321 ES Universal Rectifiers 2025-01-22 AA C1 F6 16.39 0 NR No Neg. Attachment Re-establish Neg. Attachment 1mv/ 0.2A 20 5 AC 0 No No No No Acuren J. Riggins SLO WHALE ROCK ALPHA PSA - MCC 932321 ES Universal Rectifiers 2025-01-22 AL C1 F6 4.29 0.50 8.58 Neg. Established Allow to polarize - Re-survey 1mv/ 0.2A 20 5 AC 0 No No No No Acuren J. Riggins SLO WHALE ROCK BRAVO PSB - MCC 932322 ES Universal Rectifiers 2025-01-22 AF C2 F1 10.42 0.2 52.10 Header potential low Adjust output 1mv/ 0.2A 20 5 AC 0 No No No No Acuren J. Riggins SLO WHALE ROCK BRAVO PSB - MCC 932322 ES Universal Rectifiers 2025-01-22 AA C2 F6 16.39 0.4 40.98 Header potential low Adjust output 1mv/ 0.2A 20 5 AC 0 No No No No Acuren J. Riggins SLO WHALE ROCK BRAVO PSB - MCC 932322 ES Universal Rectifiers 2025-01-22 AL C2 F6 17.36 0.70 24.80 Header potential low As-Left 1mv/ 0.2A 20 5 AC 0 No No No No Acuren J. Riggins Page 31 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 2025-03-05 APPENDIX 3: STRUCTURE-TO-ELECTROLYTE POTENTIAL DATA Page 32 of 141 CITY OF SAN LUIS OBISPO WHALE ROCK - CATHODIC PROTECTION SURVEY CP TEST POINT DATA 2025 CP SURVEY - 30" WATERLINE Pr o j e c t N a m e Te s t P o i n t T e r m i n a l I D Te s t P o i n t L e a d I D Cl i e n t A s s e t D e s i g n a t i o n Pi p e l i n e L i c e n s e N u m b e r Fr o m L o c a t i o n To L o c a t i o n Su b s t a n c e OD ( i n ) Le n g t h ( f t ) St a t u s Ma t e r i a l St r u c t u r e O n ( - m V CS E ) St r u c t u r e O f f ( - m V CS E ) An o d e O n ( - m V CS E ) An o d e O f f ( - m V CS E ) Re f e r e n c e C e l l L o c a t i o n Fi e l d C o m m e n t s Co m m e n t s Me a s u r e m e n t S t a t u s Me a s u r e m e n t D a t e In t e r r u p t e d P r o t e c t i o n So u r c e Te c h n i c i a n N a m e Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Reservoir Station A Water 30 -O -346 Port. Ref.AF 1/21/2025 N/A J. Riggins 10+00 Lead #2 - Anode 1x - Red ---------1415 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins 35.442646 Lead #0 - Empty --------- -120.887133 Lead #0 - Empty --------- Test Station Lead #1 - Pipe 1 1x - Bare CC -Reservoir Station A Water 30 -O -570 Port. Ref.No Anode at location 40+00 Insulating Coupling AF 1/21/2025 N/A J. Riggins 48+00 Lead #2 - Pipe 1 1x - Bare CC -Reservoir Station A Water 30 -O -570 Port. Ref.Confirm Isolation AF 1/21/2025 N/A J. Riggins 35.434807 Lead #3 - Pipe 1 1x - Bare CC -Reservoir Station A Water 30 -O -570 Port. Ref.AF 1/21/2025 N/A J. Riggins -120.88579 Lead #4 - Pipe 1 1x - Bare CC -Reservoir Station A Water 30 -O -570 Port. Ref.AF 1/21/2025 N/A J. Riggins Test Station Lead #1 - Pipe 1 1x - Black CC -Reservoir Station A Water 30 -O -475 Port. Ref.No Anode at location 63+00 Insulating Coupling AF 1/21/2025 N/A J. Riggins 63+00 Lead #2 - Pipe 1 1x - Black CC -Reservoir Station A Water 30 -O -475 Port. Ref.Confirm Isolation AF 1/21/2025 N/A J. Riggins 35.429397 Lead #0 - Empty --------- -120.881814 Lead #0 - Empty --------- Test Station Lead #1 - Pipe 1 1x - Black CC -Reservoir Station A Water 30 -O -430 Port. Ref.No Anode at location AF 1/21/2025 N/A J. Riggins 65+85 Lead #0 - Empty ---------AF 1/21/2025 N/A J. Riggins 35.428832 Lead #0 - Empty --------- -120.881311 Lead #0 - Empty --------- Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Reservoir Station A Water 30 -O -330 Port. Ref.71+30 Insulating Coupling AF 1/21/2025 N/A J. Riggins 71+30 Lead #2 - Pipe 1 1x - Black CC -Reservoir Station A Water 30 -O -330 Port. Ref.AF 1/21/2025 N/A J. Riggins 35.427664 Lead #3 - Pipe 2 1x - White CC -Reservoir Station A Water 30 -O -449 Port. Ref.AF 1/21/2025 N/A J. Riggins -120.880275 Lead #4 - Pipe 2 1x - White CC -Reservoir Station A Water 30 -O -449 Port. Ref.AF 1/21/2025 N/A J. Riggins Lead #5 - Anode 1x - Black ---------449 Port. Ref.Anode Depleted AF 1/21/2025 N/A J. Riggins Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Reservoir Station A Water 30 -O -415 Port. Ref.Pump Station A AF 1/21/2025 N/A J. Riggins 96+30 Lead #2 - Anode 1 1x - Black ---------415 Port. Ref.Anode Depleted ICCP system installed/ Non-Functional AF 1/21/2025 N/A J. Riggins 35.421243 Lead #3 - Anode 2 1x - Black ---------415 Port. Ref.Anode Depleted Protects Inlet/ Outlet Header AF 1/21/2025 N/A J. Riggins -120.876756 Lead #0 - Header 1 1x - Black CC -Station A Station A Water --O -250 Port. Ref.Establish structure negative AF 1/21/2025 N/A J. Riggins Lead #0 - Header 2 1x - Black CC Station A Station A Water --O -246 Port. Ref.Headers not isolated from pipeline AF 1/21/2025 N/A J. Riggins Lead #1 - Pipe 2 1x - Black CC Station A Station A Water --O -237 Port. Ref.AF 1/21/2025 N/A J. Riggins Lead #2 - Anode 2 1x - Black ---------1200 Port. Ref.Anode not connected TP at Rear of station AF 1/21/2025 N/A J. Riggins Anode Test Station Lead #1 - Pipe 1 1x - White CC -Station A Station B Water 30 -O -1279 Port. Ref.Active Anode location AF 1/21/2025 N/A J. Riggins 130+00 Lead #2 - Pipe 1 1x - White CC -Station A Station B Water 30 -O -1279 Port. Ref.AF 1/21/2025 N/A J. Riggins 35.416033 Lead #3 - Pipe 2 1x - White CC -Station A Station B Water 30 -O -713 Port. Ref.AF 1/21/2025 N/A J. Riggins -120.874328 Lead #4 - Pipe 2 1x - White CC -Station A Station B Water 30 -O -713 Port. Ref.AF 1/21/2025 N/A J. Riggins Lead #5 - Anode 1x - Red ---------1279 Port. Ref.Anode present AF 1/21/2025 N/A J. Riggins Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -385 Port. Ref.AF 1/21/2025 N/A J. Riggins 139+00 Lead #0 - Empty ---------No Anode at location 35.415255 Lead #0 - Empty --------- -120.874005 Lead #0 - Empty --------- Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -439 Port. Ref.143+00 Insulating Coupling AF 1/21/2025 N/A J. Riggins 143+00 Lead #2 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -439 Port. Ref.Confirm Isolation AF 1/21/2025 N/A J. Riggins 35.411367 Lead #3 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -420 Port. Ref.AF 1/21/2025 N/A J. Riggins -120.871147 Lead #4 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -420 Port. Ref.No Anode at location AF 1/21/2025 N/A J. Riggins Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -439 Port. Ref.157+00 Insulating Coupling AF 1/21/2025 N/A J. Riggins 157+00 Lead #2 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -439 Port. Ref.Confirm Isolation AF 1/21/2025 N/A J. Riggins 35.41093 Lead #3 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -417 Port. Ref.AF 1/21/2025 N/A J. Riggins -120.870125 Lead #4 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -417 Port. Ref.AF 1/21/2025 N/A J. Riggins Lead #5 - Anode 1x - Black ---------1417 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins Page 33 of 141 CITY OF SAN LUIS OBISPO WHALE ROCK - CATHODIC PROTECTION SURVEY CP TEST POINT DATA 2025 CP SURVEY - 30" WATERLINE Pr o j e c t N a m e Te s t P o i n t T e r m i n a l I D Te s t P o i n t L e a d I D Cl i e n t A s s e t D e s i g n a t i o n Pi p e l i n e L i c e n s e N u m b e r Fr o m L o c a t i o n To L o c a t i o n Su b s t a n c e OD ( i n ) Le n g t h ( f t ) St a t u s Ma t e r i a l St r u c t u r e O n ( - m V CS E ) St r u c t u r e O f f ( - m V CS E ) An o d e O n ( - m V CS E ) An o d e O f f ( - m V CS E ) Re f e r e n c e C e l l L o c a t i o n Fi e l d C o m m e n t s Co m m e n t s Me a s u r e m e n t S t a t u s Me a s u r e m e n t D a t e In t e r r u p t e d P r o t e c t i o n So u r c e Te c h n i c i a n N a m e Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -505 Port. Ref.AF 1/21/2025 N/A J. Riggins 160+00 Lead #0 - Empty ---------Port. Ref.No Anode at location AF 1/21/2025 N/A J. Riggins 35.410217 Lead #0 - Empty ---------Port. Ref.AF 1/21/2025 N/A J. Riggins -120.86901 Lead #0 - Empty --------- Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -587 Port. Ref.AF 1/21/2025 N/A J. Riggins 165+00 Lead #2 - Anode 1 1x - Black ---------587 Port. Ref.Anode depleted AF 1/21/2025 N/A J. Riggins 35.408715 Lead #3 - Anode 2 1x - Black ---------587 Port. Ref.Anode depleted AF 1/21/2025 N/A J. Riggins -120.867843 Lead #0 - Empty --------- Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -578 Port. Ref.171+00 Insulating Coupling AF 1/21/2025 N/A J. Riggins 176+00 Lead #0 - Empty ---------No Anode at location Confirm Isolation 35.407844 Lead #0 - Empty --------- -120.866588 Lead #0 - Empty --------- Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -525 Port. Ref.180+25 Insulating Coupling AF 1/21/2025 N/A J. Riggins 180+25 Lead #2 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -525 Port. Ref.Confirm Isolation AF 1/21/2025 N/A J. Riggins 35.406898 Lead #3 - Anode 1 1x - Black ---------1324 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins -120.865904 Lead #4 - Anode 2 1x - Black ---------1325 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -437 Port. Ref.207+00 Insulating Coupling AF 1/21/2025 N/A J. Riggins 207+00 Lead #2 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -437 Port. Ref.Confirm Isolation AF 1/21/2025 N/A J. Riggins 35.401691 Lead #3 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -426 Port. Ref.AF 1/21/2025 N/A J. Riggins -120.859617 Lead #4 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -426 Port. Ref.AF 1/21/2025 N/A J. Riggins Lead #5 - Anode 1x - Black ---------1315 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins Lead #6 - Anode 1x - Black ---------1297 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -413 Port. Ref.AF 1/21/2025 N/A J. Riggins 217+39.5 Lead #2 - Anode 1x - Black ---------413 Port. Ref.Anode present 217+39.5 Bond station AF 1/21/2025 N/A J. Riggins 35.399405 Lead #0 - Empty ---------16" Foreign Line Crossing - Valley -120.857469 Lead #0 - Empty --------- Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -217 Port. Ref.227+00 Insulating Coupling AF 1/21/2025 N/A J. Riggins 227+00 Lead #2 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -217 Port. Ref.Confirm Isolation AF 1/21/2025 N/A J. Riggins 35.396956 Lead #3 - Anode 1x - Black ---------217 Port. Ref.Anode present AF 1/21/2025 N/A J. Riggins -120.856558 Lead #0 - Empty --------- Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -545 Port. Ref.AF 1/21/2025 N/A J. Riggins 257+10 Lead #0 - Empty ---------No Anode at location 247+73 - 266+52 Parrallel Gas Main 35.380229 Lead #0 - Empty --------- -120.847629 Lead #0 - Empty --------- Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -497 Port. Ref.292+50 Insulating Coupling AF 1/21/2025 N/A J. Riggins 295+05 Lead #2 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -497 Port. Ref.295+05 Insulating Coupling AF 1/21/2025 N/A J. Riggins 35.378811 Lead #3 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -507 Port. Ref.Confirm Isolation AF 1/21/2025 N/A J. Riggins -120.846187 Lead #4 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -507 Port. Ref.AF 1/21/2025 N/A J. Riggins Lead #5 - Anode 1x - Black ---------1437 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -1182 Port. Ref.Active Anode location AF 1/21/2025 N/A J. Riggins 300+00 Lead #2 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -727 Port. Ref.302+50 Foreign Line Crossing - PG&E AF 1/21/2025 N/A J. Riggins 35.376827 Lead #3 - Anode 1x - Black ---------1182 Port. Ref.Anode present AF 1/21/2025 N/A J. Riggins -120.844256 Lead #0 - Empty --------- Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -582 Port. Ref.AF 1/21/2025 N/A J. Riggins 310+90 Lead #2 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -1543 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins 35.376827 Lead #3 - Anode 1x - Black ---------Port. Ref.AF 1/21/2025 N/A J. Riggins -120.844256 Lead #0 - Empty --------- Page 34 of 141 CITY OF SAN LUIS OBISPO WHALE ROCK - CATHODIC PROTECTION SURVEY CP TEST POINT DATA 2025 CP SURVEY - 30" WATERLINE Pr o j e c t N a m e Te s t P o i n t T e r m i n a l I D Te s t P o i n t L e a d I D Cl i e n t A s s e t D e s i g n a t i o n Pi p e l i n e L i c e n s e N u m b e r Fr o m L o c a t i o n To L o c a t i o n Su b s t a n c e OD ( i n ) Le n g t h ( f t ) St a t u s Ma t e r i a l St r u c t u r e O n ( - m V CS E ) St r u c t u r e O f f ( - m V CS E ) An o d e O n ( - m V CS E ) An o d e O f f ( - m V CS E ) Re f e r e n c e C e l l L o c a t i o n Fi e l d C o m m e n t s Co m m e n t s Me a s u r e m e n t S t a t u s Me a s u r e m e n t D a t e In t e r r u p t e d P r o t e c t i o n So u r c e Te c h n i c i a n N a m e Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -727 Port. Ref.312+00 Insulating Coupling AF 1/21/2025 N/A J. Riggins 313+90 Lead #2 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -727 Port. Ref.Confirm Isolation AF 1/21/2025 N/A J. Riggins 35.376173 Lead #3 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -505 Port. Ref.AF 1/21/2025 N/A J. Riggins -120.843635 Lead #4 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -508 Port. Ref.AF 1/21/2025 N/A J. Riggins Lead #5 - Anode 1x - Black ---------1451 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins Lead #6 - Anode 1x - Black ---------1468 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Reservoir Station A Water 30 -O -482 Port. Ref.AF 1/21/2025 N/A J. Riggins 358+00 Lead #2 - Pipe 2 1x - Black CC -Reservoir Station A Water 30 -O -319 Port. Ref.AF 1/21/2025 N/A J. Riggins 35.369856 Lead #3 - Anode 1 1x - Black ---------482 Port. Ref.Anode present AF 1/21/2025 N/A J. Riggins -120.831119 Lead #4 - Anode 2 1x - Black ---------319 Port. Ref.Anode present AF 1/21/2025 N/A J. Riggins Pipeline Exposure SAI #1 - Pipe 1 1x - Pipeline CC -Reservoir Station A Water 30 -O -472 Port. Ref.AF 1/21/2025 N/A J. Riggins PLEX-01 SAI #2 - Pipe 1 1x - Pipeline CC -Reservoir Station A Water 30 -O -NR AF 1/21/2025 N/A J. Riggins 35.369856 Lead #0 - Empty --------- -120.831119 Lead #0 - Empty --------- Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -195 Port. Ref.AF 1/21/2025 N/A J. Riggins 397+25 Lead #2 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -194 Port. Ref.397+25 Foreign Line Crossing - Unknown AF 1/21/2025 N/A J. Riggins 35.36237 Lead #3 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -207 Port. Ref.397+25 Bond Station - Unknown AF 1/21/2025 N/A J. Riggins -120.808837 Lead #4 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -207 Port. Ref.418+60 Foreign Line Crossing - Valley AF 1/21/2025 N/A J. Riggins Lead #5 - Anode 1 1x - Black ---------1291 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins Lead #6 - Anode 2 1x - Black ---------1399 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins Anode Test Station Lead #1 - Pipe 1 1x - White CC -Station A Station B Water 30 -O -200 Port. Ref.AF 1/21/2025 N/A J. Riggins 430+00 Lead #2 - Anode 1x - Red ---------200 Port. Ref.Anode not connected AF 1/21/2025 N/A J. Riggins 35.359801 Lead #0 - Empty --------- -120.799179 Lead #0 - Empty --------- Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -200 Port. Ref.AF 1/22/2025 N/A J. Riggins 461+47 Lead #1 - Foreign 1 1x - Green ---------50 Port. Ref.Unknown 461+47 Foreign Line Crossing - Gas AF 1/22/2025 N/A J. Riggins 35.359801 Lead #2 - Anode 1x - Red ---------50 Port. Ref.Anode not connected 461+47 Bond Station AF 1/22/2025 N/A J. Riggins -120.799179 Lead #0 - Empty --------- Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -346 Port. Ref.AF 1/22/2025 N/A J. Riggins 515+00 Lead #2 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -562 Port. Ref.AF 1/22/2025 N/A J. Riggins 35.359144 Lead #3 - Anode 1 1x - Black ---------1481 Port. Ref.Anode not connected AF 1/22/2025 N/A J. Riggins -120.797544 Lead #4 - Anode 2 1x - Black ---------562 Port. Ref.Anode present AF 1/22/2025 N/A J. Riggins Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -547 Port. Ref.559+30 Insulating Coupling AF 1/22/2025 N/A J. Riggins 559+30 Lead #2 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -547 Port. Ref.Confirm Isolation AF 1/22/2025 N/A J. Riggins 35.348159 Lead #3 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -325 Port. Ref.560+80 Foreign Line Crossing - Water AF 1/22/2025 N/A J. Riggins -120.769263 Lead #4 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -325 Port. Ref.AF 1/22/2025 N/A J. Riggins Lead #5 - Anode 1x - Black ---------547 Port. Ref.Anode present AF 1/22/2025 N/A J. Riggins Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -547 Port. Ref.579+00 Insulating Coupling AF 1/22/2025 N/A J. Riggins 579+00 Lead #2 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -582 Port. Ref.Confirm Isolation AF 1/22/2025 N/A J. Riggins 35.345316 Lead #3 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -331 Port. Ref.569+30 Foreign Line Crossing - Gas AF 1/22/2025 N/A J. Riggins -120.764613 Lead #4 - Pipe 2 1x - Black CC -Station A Station B Water 30 -O -332 Port. Ref.AF 1/22/2025 N/A J. Riggins Lead #5 - Anode 1x - Black ---------582 Port. Ref.Anode present AF 1/22/2025 N/A J. Riggins Pipeline Exposure SAI #1 - Pipe 1 1x - Pipeline CC -Station A Station B Water 30 -O -324 Port. Ref.AF 1/22/2025 N/A J. Riggins PLEX-02 SAI #2 - Pipe 1 1x - Pipeline ---------Port. Ref.AF 1/22/2025 N/A J. Riggins 35.343491 Lead #0 - Empty --------- -120.758687 Lead #0 - Empty --------- Page 35 of 141 CITY OF SAN LUIS OBISPO WHALE ROCK - CATHODIC PROTECTION SURVEY CP TEST POINT DATA 2025 CP SURVEY - 30" WATERLINE Pr o j e c t N a m e Te s t P o i n t T e r m i n a l I D Te s t P o i n t L e a d I D Cl i e n t A s s e t D e s i g n a t i o n Pi p e l i n e L i c e n s e N u m b e r Fr o m L o c a t i o n To L o c a t i o n Su b s t a n c e OD ( i n ) Le n g t h ( f t ) St a t u s Ma t e r i a l St r u c t u r e O n ( - m V CS E ) St r u c t u r e O f f ( - m V CS E ) An o d e O n ( - m V CS E ) An o d e O f f ( - m V CS E ) Re f e r e n c e C e l l L o c a t i o n Fi e l d C o m m e n t s Co m m e n t s Me a s u r e m e n t S t a t u s Me a s u r e m e n t D a t e In t e r r u p t e d P r o t e c t i o n So u r c e Te c h n i c i a n N a m e Anode Test Station Lead #1 - Pipe 1 1x - Black CC -Station A Station B Water 30 -O -615 Port. Ref.Pump station B AF 1/22/2025 N/A J. Riggins 602+50 Lead #2 - Anode 1 1x - Black ---------1615 Port. Ref.Anode not connected ICCP system installed/ Functional AF 1/22/2025 N/A J. Riggins 35.342727 Lead #3 - Anode 2 1x - Black ---------542 Port. Ref.Protects Inlet/ Outlet Header AF 1/22/2025 N/A J. Riggins -120.756801 Lead #0 - Header 1 1x - Black CC -Station B Station B Water 30 -O -505 Port. Ref.Requires adjustment AF 1/22/2025 N/A J. Riggins Lead #0 - Header 2 1x - Black CC -Station B Station B Water 30 -O -532 Port. Ref.Headers not isolated from pipeline AF 1/22/2025 N/A J. Riggins Lead #1 - Pipe 2 1x - Black CC -Station B W. Plant Water 30 -O -1325 Port. Ref.Anode not connected 628+80 Foreign Line Crossing - Water AF 1/22/2025 N/A J. Riggins Lead #2 - Anode 2 1x - Black Pipeline Exposure SAI #1 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.No presence of CP 625+46 Pipeline Exposure AF 1/22/2025 N/A J. Riggins PLEX-03 SAI #2 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.628+80 Foreign Line Crossing - Water AF 1/22/2025 N/A J. Riggins 35.340004 Lead #0 - Empty --------- -120.750271 Lead #0 - Empty --------- Pipeline Exposure SAI #1 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.No presence of CP 633+82 Pipeline Exposure AF 1/22/2025 N/A J. Riggins PLEX-04 SAI #2 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.AF 1/22/2025 N/A J. Riggins 35.338695 Term #0 - Empty --------- -120.738024 Term #0 - Empty --------- Pipeline Exposure SAI #1 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.No presence of CP AF 1/22/2025 N/A J. Riggins PLEX-05 SAI #2 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.AF 1/22/2025 N/A J. Riggins 35.333286 Term #0 - Empty --------- -120.706171 Term #0 - Empty --------- Pipeline Exposure SAI #1 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.No presence of CP AF 1/22/2025 N/A J. Riggins PLEX-06 SAI #2 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.AF 1/22/2025 N/A J. Riggins 35.330842 Term #0 - Empty --------- -120.701633 Term #0 - Empty --------- Pipeline Exposure SAI #1 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.No presence of CP AF 1/22/2025 N/A J. Riggins PLEX-07 SAI #2 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.AF 1/22/2025 N/A J. Riggins 35.325228 Term #0 - Empty --------- -120.690598 Term #0 - Empty --------- Pipeline Exposure SAI #1 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.No presence of CP AF 1/22/2025 N/A J. Riggins PLEX-08 SAI #2 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -NR Port. Ref.AF 1/22/2025 N/A J. Riggins 35.321939 Term #0 - Empty --------- -120.684382 Term #0 - Empty --------- Pipeline Exposure SAI #1 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -348 Port. Ref.No presence of CP AF 1/22/2025 N/A J. Riggins PLEX-09 SAI #2 - Pipe 1 1x - Pipeline CC -Station B W. Plant Water 30 -O -342 Port. Ref.AF 1/22/2025 N/A J. Riggins 35.321768 Term #0 - Empty --------- -120.684148 Term #0 - Empty --------- Page 36 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 2025-03-05 APPENDIX 4: RECTIFIER SURVEILLANCE FORM Page 37 of 141 CLIENT PROJECT JOB ID DESCRIPTION RECTIFIER NAME:Latitude Longitude RECTIFIER I.D.:35°25'16" N 120°52'36" W RECTIFIER LOCATION:MODEL # MANUFACTURED BY:SERIAL # TYPE:MAX COARSE TAPS MAX FINE TAPS VOLTS AMPS PHASE RATED T (°F) RECTIFIER INPUT AC:115 1.2 1 122 RECTIFIER OUTPUT DC:20 5 SHUNT SIZE:1 0.2 SHUNT FACTOR (A/mV): 2025-01-22 J. Riggins C1 F2 0.00 7.63 0 #DIV/0!No current output 2025-01-22 J. Riggins C1 F6 0.00 16.39 0 #DIV/0!No Neg. Attachment 2025-01-23 J. Riggins C1 F6 2.30 4.29 0.5 8.58 As-Left SYSTEM TYPE ICCP NUMBER OF ANODES Unknown SHUNT TYPE None Anode #Current (A)Current (A)Current (A)Current (A)Current (A)Current (A) 1 NR 2 NR 3 NR 4 NR 5 NR 6 NR 7 NR 8 NR 9 NR 10 NR Total:0.0 0.0 0.0 0.0 0.0 0.0 2025-01-22 Housing Excellent Hasp Excellent Gasket Seal Good Panel Excellent AC Breaker Good Transformer Good Oil Level Not Applicable Oil Color Not Applicable Oil Temperature Not Applicable 3 RECTIFIER DATA Air Cooled Advanced Services Department Tomball Office, Suite #100 14434 Medical Complex Dr Tomball, TX 77377 United States Phone: (936) 441-2288 City of San Luis Obispo SLO WL - Cayucos - San Luis Obispo Cathodic Protection Survey RECTIFIER INSPECTION REPORT 932321 GPS ES ALPHA 932321 Pump Station A - MCC PICTURES OTHER CONDITIONS Universal Rectifiers No information on groundbed, unknown number of anodes, no positive junction box located. ICCP protects Inlet/Outlet headers. Unknown if headers are isolated from pipeline segments. REMARKS Reading Date Bed # 1 6 GROUNDBED DATA DATE 0.0002 DC AMPS CIRCUIT RESISTANCE (Ohm)REMARKSTECHNICIANDC VOLTS Reading Date CONDITIONS (IF APPLICABLE) COARSE TAP FINE TAP SHUNT mV Page 1 Page 38 of 141 CLIENT PROJECT JOB ID DESCRIPTION RECTIFIER NAME:Latitude Longitude RECTIFIER I.D.:35°20'33" N 120°45'23" W RECTIFIER LOCATION:MODEL # MANUFACTURED BY:SERIAL # TYPE:MAX COARSE TAPS MAX FINE TAPS VOLTS AMPS PHASE RATED T (°F) RECTIFIER INPUT AC:115 1.2 1 122 RECTIFIER OUTPUT DC:20 5 SHUNT SIZE:1 0.2 SHUNT FACTOR (A/mV): 2025-01-22 J. Riggins C2 F1 1.10 10.42 0.2 52.10 As-Found 2025-01-22 J. Riggins C2 F6 1.80 16.39 0.4 40.98 Adjusted 2025-01-23 J. Riggins C3 F1 1.80 17.36 0.7 24.80 As-Left SYSTEM TYPE ICCP NUMBER OF ANODES Unknown SHUNT TYPE None Anode #Current (A)Current (A)Current (A)Current (A)Current (A)Current (A) 1 NR 2 NR 3 NR 4 NR 5 NR 6 NR 7 NR 8 NR 9 NR 10 NR Total:0.0 0.0 0.0 0.0 0.0 0.0 2025-01-22 Housing Excellent Hasp Excellent Gasket Seal Good Panel Excellent AC Breaker Good Transformer Good Oil Level Not Applicable Oil Color Not Applicable Oil Temperature Not Applicable Advanced Services Department Tomball Office, Suite #100 14434 Medical Complex Dr Tomball, TX 77377 United States Phone: (936) 441-2288 City of San Luis Obispo SLO WL - Cayucos - San Luis Obispo Cathodic Protection Survey 0.0002 RECTIFIER INSPECTION REPORT BRAVO GPS932322 Pump Station B - MCC ES Universal Rectifiers 932322 Air Cooled 3 6 RECTIFIER DATA DATE TECHNICIAN COARSE TAP FINE TAP SHUNT mV DC VOLTS DC AMPS CIRCUIT RESISTANCE (Ohm)REMARKS Reading Date CONDITIONS (IF APPLICABLE) PICTURES GROUNDBED DATA Bed # 1 Reading Date REMARKS No information on groundbed, unknown number of anodes, no positive junction box located. ICCP protects Inlet/Outlet headers. Unknown if headers are isolated from pipeline segments. OTHER CONDITIONS Page 2 Page 39 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 2025-03-05 APPENDIX 5: LIST OF DRAWINGS Drawing Number Drawing Description SLO-CC-0001 Conduit As-Built Station 0 to 255 SLO-CC-0002 Conduit As-Built Station 255 to 525 SLO-CC-0003 Conduit As-Built Station 555 to 810 SLO-CC-0004 Conduit As-Built Station 810 to 903 and detail drawings SLO-CC-0005 Pump Station As-Built - Upgrade Page 40 of 141 City of San Luis Obispo I Cathodic Protection Report 2025 Whale Rock 30” Waterline CP Survey ACUUS-J212126-RSV-0.0 2025-03-05 APPENDIX 6: CATHODIC PROTECTION PHOTO LOG Page 41 of 141 PHOTO SUMMARY City of San Luis Obispo Whale Rock Cathodic Protection Survey 2025-01-20 Page 42 of 141 2025 CP Survey – TP 10+00 Page 43 of 141 2025 CP Survey – TP 48+00 Page 44 of 141 2025 CP Survey – TP 63+00 Page 45 of 141 2025 CP Survey – TP 65+85 Page 46 of 141 2025 CP Survey – TP 71+30 Page 47 of 141 2025 CP Survey – TP 96+30 Page 48 of 141 2025 CP Survey – TP 130+00 Page 49 of 141 2025 CP Survey – TP 139+00 Page 50 of 141 2025 CP Survey – TP 143+00 Page 51 of 141 2025 CP Survey – TP 157+00 Page 52 of 141 2025 CP Survey – TP 160+00 Page 53 of 141 2025 CP Survey – TP 165+00 Page 54 of 141 2025 CP Survey – TP 171+00 Page 55 of 141 2025 CP Survey – TP 176+00 Page 56 of 141 2025 CP Survey – TP 185+25 Page 57 of 141 2025 CP Survey – TP 207+00 Page 58 of 141 2025 CP Survey – TP 217+39.5 Page 59 of 141 2025 CP Survey – TP 227+00 Page 60 of 141 2025 CP Survey – TP 257+10 Page 61 of 141 2025 CP Survey – TP 295+05 Page 62 of 141 2025 CP Survey – TP 310+90 Page 63 of 141 2025 CP Survey – TP 313+90 Page 64 of 141 2025 CP Survey – TP 358+00 Page 65 of 141 2025 CP Survey – TP 397+25 Page 66 of 141 2025 CP Survey – TP 430+00 Page 67 of 141 2025 CP Survey – TP 461+47 Page 68 of 141 2025 CP Survey – TP 515+00 Page 69 of 141 2025 CP Survey – TP 559+30 Page 70 of 141 2025 CP Survey – TP 579+00 Page 71 of 141 2025 CP Survey – Pump Station A Page 72 of 141 2025 CP Survey – Pump Station A Page 73 of 141 2025 CP Survey – Pump Station B Page 74 of 141