Item 19 - Agreements for On-Call Engineering Services

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PROPOSALFOR On -Call Engineering Design Services SCOPE OF SERVICES Tetra Tech proposes to provide engineering and consulting services for PFAS Treatment System Designs as outlined in the City's RFP and the following sections. 1. Planning Study and Consulting Services Tetra Tech will perform a Planning Study for the City in which the number of wells impacted by PFAS, their location, and areas available for a treatment system(s) and truck access would be examined. The Planning Study would determine how the treatment system(s) would be integrated into the City's existing operations, determine if a centralized treatment plant is feasible for combining wells, provide alternative design options, assess the potential for blending, provide initial support for permitting and develop capital costs associated with potential land acquisition, permitting, pipeline connections and system integration. In general, the scope of work will include the following for the Planning Study: A. Management Activities Tetra Tech will conduct project management activities to ensure adherence to budget and schedule. We will coordinate and attend meetings with City staff pertaining to the project kickoff, reviewing draft reports, and as needed to prepare and address project inquiries and issues. In addition, Tetra Tech will provide meeting minutes for each meeting as well as biweekly updates of progress to the City. B. Well Assessment and Initial Treatment Design Our staff will gather information on the City's groundwater conveyance systems, impacted wells, reservoirs, imported water connections, and conduct site visits to all well sites affected to determine available area of land for the PFAS treatment system(s) as well as determine how the treatment system(s) will be integrated into the City's existing operations. Tetra Tech will also review existing and available information on the City's historical PFAS bench -and pilot -scale testing as well as historical Planning Studies performed and existing PFAS treatment facility layouts and adhere to the standards set therein. In the preliminary Planning Study, Tetra Tech will provide a conceptual layout for each requested location by the City based on existing ion exchange (IX) treatment systems (Aqueous Vets System rated PFAS Treatment Systems for 150 PSI), For all IX wellhead treatment designs we will include cartridge fitter pre-treatment, a sand separator, IX lead -lag system capable of addressing the well(s)'s gallon per minute capacity, an emergency generator, and an additional sound attenuated booster pump to combat the head loss experienced through the new treatment system, C. Permit Assessment Tetra Tech will perform an initial permitting assessment to understand any requirements, as well as develop a list of required permits (including permit description, issuing regulatory agency, summary of permit requirements, and permit acquisition timelines). ❑. Feasibility Study The Planning Study will include a Feasibility Study which investigates hydraulic conditions of existing wells and determine what modifications to existing well pumps and transmission systems will be necessary, if any, for the installation of the proposed PFAS wellhead treatment facilities. E. Cost Estimates Tetra Tech will provide cost estimates for the treatment facility equipment, any necessary land acquisition to accommodate a treatment systems), permitting, plumbing connections, transmission alignments and system integration. We will also include capital, maintenance, and operation cost estimates for IX treatment system(s). F. Preliminary Schedule Tetra Tech will develop a preliminary phasing schedule for construction in the Planning Study. The plan is intended to provide the City a schedule and projected annual outlays for financial planning. In the preliminary schedule, Tetra Tech will include the anticipated duration of construction as well as any necessary utility extensions required. G. Final Report Our final report will include discussion of all items listed herein and will be submitted to the City for review and comments, We will provide a PDF digital copy of the preliminary report and will incorporate all comments made by the City prior to submitting of the final report. The following page contains a proposed layout of Well 26. 2. Design Phases Once the Planning Study has been completed, Tetra Tech will provide design services including preparation of design sheets, specifications, and TETRA TECH Page 117