CAROLLO ENGINEERS, INC. 3RD AMENDMENT (#2022494)

PAGE 1 of 3 EXHIBIT A DISINFECTION BYPRODUCTS CORRECTIVE ACTION PLAN IMPLEMENTATION ASSISTANCE City of Pleasanton The City of Pleasanton retained Carollo Engineers, Inc (Carollo) to prepare a regulatory compliance report, called a Corrective Action Plan/Operations Evaluation Report (CAP/OER), for submittal to the State of California, Division of Drinking Water (DDW). The CAP/OER outlined several action items that the City plans to implement by June 2026 to achieve regulatory compliance, along with additional actions intended to support the City’s long-term water quality management objectives. The City requested that Carollo provide professional services to support implementation of some of the actions identified in the CAP/OER. This scope of work describes Carollo’s services. Scope of Work Task 1 Project Management and Meetings This task covers the administration of the project work including coordination with internal Carollo team and the administration of subconsultants, development and submission of monthly invoices and progress reports and facilitate bi-weekly meetings. Task 1 .1 Project Administration Carollo will administer the project and coordinate with subconsultants on billing, invoices and deliverables. Carollo will develop monthly invoices and progress reports. Task 1 .2 Bi-weekly Meetings Bi-weekly progress reports will be scheduled to coordinate current tasks and efforts, discuss on-going project needs, meetings, and other associated tasks. These meetings will be virtual and hosted by Carollo. Task 1 Deliverables  Monthly invoices and progress report  Site visit field notes  Bi-weekly meeting summaries (as necessary) Task 2 Development of Standard Operating Procedures (CAP/OER Action Item ST-6A and 6B) Carollo will develop Standard Operating Procedures (SOPs) to support the City’s response to Disinfection Byproduct (DBP) exceedances and ongoing chlorine residual management. The SOPs will be developed in coordination with City staff and will be consistent with applicable regulatory requirements and industry best practices. The SOPs will address the following topics: 1. Elevated DBP Response: Procedures for identifying elevated DBP conditions, initiating response actions, implementing corrective measures, documenting actions taken, and communicating internally and with regulators as appropriate. Docusign Envelope ID: 271FE856-C5AE-4E67-BBDD-ED81F3311151