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 Vault Design Option The City is considering placing the relocated SA-2 PRS Facility within a building or within a below ground service vault. Tetra Tech has dealt with this issue on following relevant projects: For MNWD's ID 1 Master Meter Relocation, Tetra Tech evaluated several potential locations and at each location looked at within a building, within a wall enclosure and within a below grade vault; For OCWD's Mid -Basin Injection Wells, Tetra Tech designed the four well injection facilities within large below grade vault structures. For IRWD's Well 78 Replacement, Tetra Tech designed the new well within a below grade vault structure with multi -story apartment structures only 50 feet away from the vault (Warner Avenue and Culver Drive); For IRWD's Well ET-2 Replacement, Tetra Tech designed the new well within a below grade vault structure adjacent to a large commercial center (Irvine Center Drive and Culver Drive); and For the City's San Lorenzo Lift Station, Tetra Tech designed the new wet well and lift station facility (and corresponding shoring specifications) adjacent to an existing hotel complex and residential development. Tetra Tech can provide the City with the 3D renderings of the Mid -Basin Injection Well Facilities if the City so desires. Tetra Tech has an excellent understanding of the shoring requirements, noise concerns, and construction restrictions when constructing adjacent to a residential house and across the street from an existing school. Electrical/Control, Tetra Tech has an excellent understanding of the City's electrical and control designs as a result of our previous projects: Well 32 Rehabilitation; SA-7 Relocation; SA-5 Vault Upgrade; and SA-1 Hydro - Generator Replacement. In addition, Enterprise Automation, one of the City's Control System Design Programmers, is now a Tetra Tech company. They will be available to provide valuable assistance and input throughout the design process. Permitting SA-2 is a City facility and will need to have the design work coordinated with all involved agencies, including the City's Building and Public Works. Tetra Tech has an excellent understanding of the City's permitting requirements due to the following projects: SA-7 Relocation and Well 32 Rehabilitation Projects (City's Building and Parks); Mesa's Well Pipelines and Well 32 Rehab Pipeline (City's Public Works); and OCWD's Mid -Basin Project (City's Building, Parks, Fire and Public Works). Coordination with MWD and SCE is vital for the success of this project. Tetra Tech has been coordinating with MWD for the SA-5 Vault Relocation Project. In addition, Tetra Tech has added Scott Foster Engineering, Inc. to our team to assist with satisfying MWD's potential request for a transient analysis of the new pressure control system. Scott Foster has performed surge analysis on over 15 different MWD pipelines so understands what MWD is looking for. Tetra Tech has been in coordination with SCE for the SA-1 Hydro -generator. This previous dealings with SCE will allow Tetra Tech to accelerate the design and obtaining approval for the SA-2 hydro - generator. Tetra Tech has an excellent working relationship with SCE as can be seen by the latest coordination effort with SCE at the John Garthe Pump Station Facility. TETRA TECH Page 17