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 UNDERSTANDING SCOPE OF SERVICES Background The existing Metropolitan Water District (MWD) SA-2 meter vault houses a 12-inch connection from the Metropolitan Water District's Orange County Feeder line (36-inch water main) located within Bristol Street. The MWD SA-2 meter vault is currently located underneath the sidewalk on the south side of West 1 st Street, roughly 60 feet east of Bristol Street. Once outside of the meter vault, the existing 12-inch pipeline, which is cast iron and constructed in 1943, carries the high-pressure water (approximately 170 psi) to an existing Pressure Reducing Station (PRS) located near the southeast corner of the intersection of Flower Street and 1 st Street. The water imported from MWD exists the PRS at a lower system pressure and is deposited into Walnut Reservoir and the distribution system. The existing connection normally operates around 8.0 cubic feet per second (cfs) and has a maximum capacity of 15.0 cfs. The City had a feasibility study prepared by Tetra Tech to evaluate potential sites for the relocation of the SA-2 Facility. The City selected the following possible locations for the SA-2 Facility: a City owned parcels of land located at 116 South Flower Street or 202 South Flower Street. The new station shall contain both a pressure reducing valve and a hydro -turbine generator. Power generated by the hydro - turbine generator will be conveyed to the Walnut Pump Station Facility by a new proposed electrical conduit. Onsite battery storage will also be required with smart programming to switch from grid power to local power on demand. The high-pressure MWD conveyance pipeline will need to be replaced from the MWD SA-2 meter vault to the proposed location of the new SA-2 pressure control station, about 3,500 feet of new transmission main. The City is evaluating options for connecting to Walnut Reservoir and the City's distribution system as a result the City is requesting the possibility of adding approximately 2,900 feet of distribution water main to the project. The City would like all design work to be completed with the intent to enter the Envision Award process. A nr%r/1nf•% We are offering an outstanding team, which combines the experience, depth, and understanding needed for the successful delivery of this project. Our core principles establish how we plan to work together with the City to successfully complete this project: Service: Tetra Tech puts its clients first. We listen to and better understand our clients' needs and deliver smart, cost-effective solutions that meet those needs. Our philosophy is to "Do it Right." Value: Tetra Tech takes on our clients' problems as if they were our own. We develop and implement real -world solutions that are cost-effective, efficient, and practical. Excellence: Tetra Tech brings superior technical capability, disciplined project management, and excellence in safety and quality to all of our work. Opportunity: Our people are our number one asset. Our workforce is diverse and includes leading experts in our fields. Our entrepreneurial nature and commitment to success provides challenges and opportunities. We value the relationship that has been established with the City, and look forward to continuing and further developing this association in the future. We are committed to providing the City with the same high -quality service you expect and deserve. Our strength lies in our proven track record that has led to successful completion of multiple projects for the City, as well as other project participants or nearby agencies. TETRA TECH Page 15