6. CONS 23-648 Adopt a Resolution Authorizing the City Manager to Amend the Professional Services Agreement with Brown and Caldwell to Increase the Contract Amount by $8,023,117 to a Not-to-Exceed Amount of $16,672,828 for Final Design Services for the Water Pollution Control Facility (WPCF) Improvements Phase II Project No. 07760, and Authorize Use of Contingency Funds for Design of the Existing Final Clarifiers Retrofit