Item 21 - Pressure Control Station Relocation and Transmission Main Improvements

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SA-2 Pressure Control Station Relocation and Transmission Main Improvements RFP No. 21-127 Construction Phasing Construction phasing will be a key element of the project design and specifications. We will work with the City to minimize the impacts of the construction to the adjoining commercial and residential properties, including the school. We are sensitive to their concerns regarding construction impacts and concerns of the local residences, school and businesses along the proposed alignment. We will consider the following: identify the schools, churches and emergency facilities; develop plans to minimize impacts; maintain access to all commercial, businesses, and residences; evaluate construction noise impacts; and limit the length of the Work Zone. Our previous experience has shown the importance of limiting the length of the total work zone the contractor will be allowed. By requiring the contractor to phase his construction, pressure test, pace final pavement and perform clean-up within reasonable working limits prior to starting new excavation work, the construction impacts to the community/public are minimized. CE0 n Tetra Tech understands the City's process for CEQA approval as we have previously completed the CEQA documentation for Well 32 and Washington Well Rehabilitation Projects. Our CEQA Manager, Paula Fell, has an excellent working relationship with the City's staff due to these projects. The City desires to attain the highest Envision Rating possible for this project. All design work shall be completed with the intent to enter the Envision Award process. Tetra Tech's Project Team has extensive experience in the Envision Certification process. Within the Relevant Experience Section of our proposal, we have listed six (6) projects where Tetra Tech has obtained or pursued a Envision Award of Gold Rating. Due to this experience, Tetra Tech will be able to recommend the most appropriate verification pathway, design and be able to manage the Envision Verification Process on behalf of the City. Rey uesign ueCisivi Based on our understanding of this project due to preparing the feasibility study, Tetra Tech envisions the following key design decisions that will need to be made by the City: Confirm PRS and hydro -generator mechanical plan layout. Location of PRS facility: either 116 or 202 South Flower Street. Tetra Tech recommends that the site not selected be allowed by the City to be used by the contractor as his staging area during construction. PRS facility to be constructed: within a wall enclosure; within a building; or within a below grade vault structure. Tetra Tech will prepare preliminary layouts at each site for these three options. Based on noise impacts, Tetra Tech has assumed a below grade vault structure will be selected by the City. Pipeline alignment selection within West 1st Street, including traffic control. Pipe material selection and recommended thrust restraint. Architectural features of the site, including 3D renderings of the site. Alternative strategies to store energy from the hydro -generator as well as any solar paneling or other alternative energy generation devices. Evaluate locations for possible battery storage unites (size and footprint). Electrical and control system operating procedures for the PRS and the hydro -generator facility. I Recommendations for communication between SA-2 and Walnut Pump Station. TETRA TECH Page 18