Agmt21 Alisto Engineering Group, Inc.

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EXHIBIT "A" SCOPE OF SERVICES AND FEE Consultant will provide corrosion protection services for Redwood City's Water System. The work will be performed by experienced registered professional engineers and technical specialists certified by the National Association of Corrosion Engineers (NACE) under the supervision of a project manager responsible for the overall quality of personnel performance and deliverables. The scope of work to be performed by the Consultant includes: 1. Field Assessment and Investigation Services The Consultant will perform the field assessment, investigation and testing in accordance with NACE International Standard Test Method TM0497-2002, "Measurement Techniques Related to Criteria for Cathodic Protection on Underground or Submerged Metallic Piping Systems," and will include the following: a. Inspect facilities and review project record drawings and historical cathodic protection documents. The Consultant will provide the review prior to performing field testing, and will include historical cathodic protection (CP) survey reports, corrosion monitoring (Inline Inspection or other) reports, and as -built drawings, cursory information about the systems (coatings, CP system configuration, pipeline locations, risers and valve yard locations). The document review will be performed to determine the type of assets that are involved and identify any potential cathodic protection issues and to formulate the work plan and scope for a comprehensive field CP survey. b. Project Soil Corrosivity Survey using three methods as required: Electromagnetic Conductivity Survey, Wenner 4 -pin Survey, and Soil Sampling and Analysis. Survey shall at a minimum include (but not limited to) the following standard (Caltrans) tests: Electrical resistivity analyses per ASTM — G187 (soil box method, as received and saturated conditions), Chloride (CTM 422), Sulfate (CTM 417), ph (CTM 643). The Consultant's work on soil resistivity measurements will also include: • Wenner 4 -pin method with instrument capable of filtering 60 Hz • Deep measurements at discontinuities • Shallow measurements at a minimum of/2 mile c. Consultant will perform Baseline Potential Survey using existing test stations, including 2 -wire and Insulating Joint (I.J.) type test stations. Consultant will measure the pipe -to -soil potentials with the current applied and temporarily interrupted to determine if the pipelines meet NACE international criteria for corrosion protection. Pipe -to -soil potentials will be measured at all accessible test stations located at all of the structures. REV: 09-13-21 RL ATTY/AGR.2021.238/Alisto, Engineering Group (Water System Corrosion Protection) (Page 11 of 15)