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BASIS OF DESIGN REPORT EXECUTIVE SUMMARY I PEAS TREATMENT AND WELL REHABILITATION PROJECT I CITY OF PLEASANTON ES.4 Project Implementation The following contracts are recommended to support implementation of the Project: • Final Design Services—This contract would entail hiring a consultant to perform final design and related services such as field investigations and CEQA report preparation. • PFAS Treatment Media Procurement—It is recommended that the treatment media vendor be selected by the City during final design and separate from the general construction contract to enable selection of the vendor based on a low life-cycle cost basis(supported by vendor media testing)and to coordinate the terms of the maintenance agreement. • PFAS Vessels Procurement—It is recommended that the vessels be procured by the City during final design and separate from the general construction contract due to their long lead time and to mitigate potential schedule delays. • Well 9 and 10 Casing Installation—It is recommended that the well casings be installed during final design and separate from the general construction contract to confirm well performance and incorporate pumping system requirements into the final design prior to bidding out the overall Project. • Project Construction—This would be a traditional public works contract awarded to the lowest,responsible bidder to construct the overall Project. • Construction Support Services—These contracts would include third-party construction management and engineering services. Figure 6 summarizes the project schedule,key tasks,and durations for delivery of the Project.A detailed project schedule is included in Appendix B.The design phase is estimated to be complete by early 2023.Well 9 and 10 casing installation(which is recommended to occur prior to finalizing design as discussed above)is recommended to occur during winter of 2022 since existing Wells 5 and 6 may need to be turned off during the installation and customer demands are lowest during this time period.The Project would be bid for construction early 2023. Construction of the CTF,the pipeline,and Wells 8 and 9 would occur first and is estimated to be complete by May 2024,around the time DDW is anticipated to issue a final MCL. During this construction period,existing Well 5 and 6 would remain operational.After Wells 8 and 9 are commissioned and operational through the CTF,existing Wells 5 and 6 would be removed from service and construction of Well 10 would occur.The construction of Well 10 and final completion of the Project would be completed by December 2024. C Cr^"^ DRAFT MAY 2021 11