Agmt21 Alisto Engineering Group, Inc.

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d. Consultant will test for project electrical isolation in accordance with NACE International SP0286-07 and investigate any source of stray current. Consultant understands that the effectiveness of the cathodic protection system depends on the electrical isolation between the buried pipelines and the electrical grounding system and above -grade pipelines. Therefore, rehabilitation and improving the effectiveness of the cathodic protection system will include evaluating and installing dielectric insulating kits at critical junctions and system components as required to comply with NACE Standards. e. Consultant will perform stray current investigation to ascertain the presence and effects of nearby impressed current systems. f. Consultant will test Electrical Continuity along the pipeline using the following methods: Circulating current test method, application of temporary cathodic protection current, measuring earth gradients between two electrodes while applying temporary cathodic protection current. Coating conductance tests will be performed by Consultant if adequate spans are available for testing. g. Consultant will conduct tracing of pipe alignment using a pipe locator with suitably tuned audio frequency. h. Consultant will perform Close -Interval -Survey or cell -to -cell survey per NACE International RP0502-02 Sections A4.5 and A8 respectively, Current Standard of Practice, Pipeline External Corrosion Direct Assessment Methodology after completion of task "F" for up to five selected areas for approximately 400 linear feet and based on soil corrosivity, electrical discontinuities, topography, and road hazards. Consultant will document the location of pipe features and test stations (overlay on record drawings) using Global Positioning Systems (GPS). All GPS data points shall be compatible with the City's mapping system/program (GIS). The documentation will also be accompanied with digital photos, with written description of facilities and the equipment and tests used for the fieldwork. Upon request of the City Engineer or designee, Consultant will perform design, installation and commissioning of cathodic protection systems, including labor, materials, and equipment; minor repairs, including connections and wirings of cables and coupons to terminals; and repairs of loose connections. Providing that excavation work that requires Contractor's Class A license will be performed by others under a separate agreement, per City's requirements. k. Consultant will provide Ultrasonic thickness measurements of pipe wall; expose pipe and repair coatings, as required; and provide the measurements and reporting of the thickness with an ultrasonic thickness gauge and multiple echo transducer. REV: 09-13-21 RL ATTY/AGR.2021.238/Alisto, Engineering Group (Water System Corrosion Protection) (Page 12 of 15)