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4-1 DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document. Water Supply Alternatives Study-Draft Report.docx Section 4 Preferred Alternative and Implementation Plan This section presents the preferred project alternative, project delivery approaches, and a preliminary implementation plan. 4.1 Preferred Alternative Alternative 3 (Two New City Wells) is the preferred alternative as it provides significant benefits at the lowest cost, with relatively straightforward operations, i.e., groundwater pumping is already within the City’s expertise, in contrast to treatment. Alternative 3 is anticipated to yield high-quality drinking water, drawn in a manner that is unaffected by and does not disturb the PFAS plume. 4.2 Project Delivery Approaches The City could implement Alternative 3 on its own. Otherwise, project delivery for Alternative 3 could involve a regional project in partnership with Zone 7 and/or use of an alternative project delivery method for saving cost and/or time. 4.2.1 Potential Regional Project Zone 7 has recently decided to accelerate its groundwater modeling update and is currently exploring accelerated installation of new wells in similar areas and on the same timeline as Pleasanton’s possible sites for its need for new well capacity. The City’s initial step toward constructing two new wells is dependent upon Zone’s 7 efforts to update its regional groundwater model. The City and Zone 7 will coordination closely during this process. Once completed, City staff will evaluate joint implementation of a new well with Zone 7, which may result in cost savings for the City and Zone 7. In preparation for this evaluation and in parallel with Zone 7’s modeling work, City staff will engage with Zone 7 to define key terms for an agreement to implement a joint project so that these conditions can be part of the evaluation. 4.2.2 Delivery Method The traditional method of project delivery is design-bid-build (DBB). This is the standard approach used by the City. When using DBB, the project owner (i.e., City) selects an engineer to design the project, develop plans and specifications, and evaluate contractor bids. Typically in DBB, the construction contract is awarded to the lowest responsive, responsible bidder, and the engineer or a construction manager monitors construction. DBB typically works best when: •The owner has specific quality requirements. •Achieving competitive pricing is a priority. •The project requires a high degree of public engagement. Other alternative delivery methods are available and may offer unique benefits compared to traditional delivery using DBB. Of the various alternative delivery methods, performance-based fixed- price design-build (DB) may be a viable approach for Alternative 3 implementation. When using DB, a