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14 THE CITY OF CITY COUNCIL AGENDA REPORT pLEASANTON® January 19, 2021 Operations Services TITLE: APPROVE FIRST AMENDMENT WITH CAROLLO ENGINEERS FOR ADDITIONAL SERVICES RELATED TO PREPARING THE BASIS OF DESIGN REPORT FOR THE PER-AND POLYFLUOROALKYL SUSTANCES (PFAS) TREATMENT AND WELLS 5, 6, AND 8 REHABILITATION PROJECT (CIP 21166) IN THE AMOUNT OF $100,000 SUMMARY On September 1 , 2020, City Council approved an agreement with Carollo Engineers in the amount of $437,374 to prepare a basis of design report for the PFAS Treatment and Wells 5, 6, and 8 Rehabilitation Project (Project). Staff has identified additional items that are recommended to be incorporated into the basis of design report including the evaluation of treatment technologies to meet potential hexavalent chromium (CrVI) regulations, and a feasibility review of relining or replacing the well casings at Wells 5 and 6. This proposed first amendment amount is $100,000 and is estimated to extend the basis of design report completion schedule from March 2021 to May 2021 . RECOMMENDATION 1 . Approve first amendment with Carollo Engineers for additional services related to preparing the basis of design report for the PFAS Treatment and Wells 5, 6, and 8 Rehabilitation Project (CIP 21166) in the amount of $100,000 and an extension to May 2021 . 2. Allocate $70,000 from Fund 421 Water Replacement Capital Improvement Program to CIP 21166. FINANCIAL IMPACT The first amendment with Carollo Engineers is for $100,000 and increases the overall contract not-to-exceed limit from $437,374 to $537,374. The available fund balance in CIP 21166 is currently $470,000. Staff recommends City Council allocate $70,000 from Fund 421 Water Replacement Capital Improvement Program to CIP 21166 to bring the available fund balance in the project to $540,000.