Brown and Caldwell Inc. 3/9/2022 Amendment 1

r"it rr t Water Treatment Plant Portal 4 Improvements I Scope of Work • Work products will be electronic. • Existing 2" conduit and cable providing power from the WFP to Portal 4 can be reused and does not require replacement. • Amendment 1 budget includes reapportionment of preliminary design fees previously shifted to surveying services Task 603 by the budget reallocation dated December 3, 2021. • The Amendment 1 budget includes reapportionment of intermediate design fees previously shifted to geotechnical services Task 601 by the December 3, 2021 budget reallocation. • Electrical cable cost estimating assumes in-kind replacement of the existing single phase cable and use of the existing buried conduit. Meetings • Design comment review call. Assume attended by five BC staff, with a duration of two hours, one each at preliminary (30%) and intermediate design (60%) stages. • Site visit during design as needed.Assume attended by two BC staff, with a duration of two hours on site. Work Products • Preliminary Design (30%) • Intermediate Design (60%) • CAD files of intermediate designs. • ACEI Class 5 construction estimate. Task 450 Isolation Valves, Security Fence, and Cable Replacement Preliminary and Intermediate Design Activities/Approach:This task covers work to be completed by civil and process mechanical disciplines for the preliminary and intermediate design of isolation valves and vaults on transmission lines 2, 3, and 4,the Portal 4 security fence, and in-kind replacement of the single phase power cable servicing Portal 4.This work is a continuation of conceptual design presented in the BODR completed under Task 300 and mirrors preliminary and intermediate design activities of Task 400. Task Assumptions • BC will carry out preliminary and intermediate design of the isolation valves, the security fence, and cable replacement in parallel with the intermediate design phase of the other project elements. • Upon completion of Task 450, intermediate design documents for the isolation valves, vaults, security fence, and cable replacement will be integrated into the core intermediate design for delivery to the City as a single package. • No preliminary design documents for the transmission line valves, vaults, security fence, and cable replacment will be developed. • Dewatering and shoring design will be responsibility of contractor. • Valve vaults will not require design of deep foundations. Additional design budget will be necessary if deep foundations are required. • Electrical cable design assumes in-kind replacement of the existing single phase cable. The new cable will be installed in the existing buried 2-inch diameter conduit. • BC assumes the electrical cable routing and access points presented in the March 2003 Portal 4 Modifications as-built drawing sheet E105A are accurate and will serve as a reference for the cable replacement design. Page 7 of 13