STANTEC CONSULTING SERVICES, INC. (4)

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Design Phase After the planning study has concluded, Stantec will proceed with the various stages of preliminary and detailed design, initially for Well 26. As one of the largest water treatment design consultants in the world, we plan to use local in-house staff to execute our designs, with the exception of geotechnical and control/automation services. We maintain all other necessary design disciplines, including full survey services, along with architectural and landscape services, if needed. This affords the ability to quickly assemble design teams familiar with each other and streamlines communication throughout the design process. Preliminary Design Phase An important element in design is regular communication: It is critical that our design team and City staff engage in early and frequent communication. Stantec will prioritize the thorough review of all record drawings, a complete investigation and documentation of existing site features, and interviewing City engineering and operations staff to understand the state of existing facilities as completely as possible. This information will form the basis of our team's design concepts and will be revisited at each design stage to minimize the potential for unexpected design and construction costs. As we have learned during the design and construction of the Well 40 and 38 sites under the OCWD on -call contract, particular areas of interest that require identification during the early stages of design include: + Site access and O&M constraints and considerations + Location of existing City owned and private utilities within the project site + Age/condition of existing mechanical and electrical equipment + System hydraulics analysis + Any planned site improvements or expansions To demonstrate and document our understanding of the design constraints, criteria, and objectives, we will prepare a design report that evaluates the proposed alternatives from the planning study against these standards. The report preparation consists of the following: + Survey and Base Map Preparation: Monuments will be observed to retrace the extents of any easements and the centerlines and nearby streets right of ways within the project limits. Of particular importance to the Well 26 site is the verification of any easements associated with the railway behind the property. The results will be incorporated into a base -map illustrating existing right-of-way conditions. Available agency research, prior surveys, and assessor parcel maps will be used to prepare the base map. + Information Collection: First and foremost, we will request, collect, and document all City, private utility, and public utility records and documentation as described in the previous paragraphs. The planning study will be reviewed to identify the proposed alternatives and design criteria. After review of the collected records, we will engage the City as needed for additional input on the project design criteria and goals. + Preliminary Design Report Preparation: The report will consist of an existing conditions description and evaluation, the project's design criteria and other objectives, proposed design alternatives, geotechnical findings, required controls modifications, and Stantec's recommendations. + Preliminary Design Review: Stantec will submit the Preliminary Design Report to the City for review. A review workshop will be held with City staff and the Stantec team. The goal of this preliminary design review is to verify Stantec's understanding of the existing facilities and City's specific design objectives, as well as to confirm the City's agreement with the presented recommendations. + Final Design Report: Based on the feedback obtained from the preliminary design review, we will prepare a Final Design Report that will form the foundation and guidelines for detailed project design. At this time, the preferred design alternatives will be selected, and all design recommendations will be finalized to establish a clear direction for thef the project's design. The submission and acceptance of the Final Design Report will complete the preliminary design phase. All identified major design questions, criteria, and risks will have been answered, addressed, and mitigated at this point to help ensure the smooth completion of the detailed design, bidding, and construction phases. Detailed Design Phase Following the framework established by the Final Design Report and 30 Percent Design documents, Stantec will prepare a detailed and coordinated set of construction documents (CDs). To verify production of the highest - quality CDs, Stantec will employ a robust quality assurance and control (QA/QC) program at each level of document submittal. The QA/QC program will review all design calculations, check for compliance with state and local regulations, verify the design is coordinated with existing site constraints, and cross check between the discipline drawings and specifications to coordinate design requirements between the documents. This QA/ City of Santa Ana On -Call Engineering Design Services for PEAS Treatment Systems RFP NO. 22-133 10