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 SCOPE OF WORK Members of our Project Team have performed an in-depth review of the scope of work contained in the Request for Proposal (RFP), performed a site visit and are very familiar with the existing conditions that may impact the work since we prepared the SA-2 Feasibility Study. Because of the proposal page limitation, we acknowledge the scope of work contained in the RFP and have only added the below tasks that we have comments on or wanted to expand on. Task 1: Project Administration and Multi -Agency Coordination Tetra Tech's initial schedule will include the critical path designation and a description of and schedule for progress meetings dealing with Key Design Decisions stated in our Approach Section (Key Design Decisions). Tetra Tech will continually reference the critical path schedule on our bi-weekly status e-mails and monthly schedule updates. For the purpose of this proposal, Tetra Tech has assumed the following ten (10) meetings: kick-off; one (1) meeting with MWD; two (2) meetings with SCE; four (4) design process review meetings (Basis of Design, 60%, 90% and Final PS&E); and two (2) meetings regarding permits with Public Works, Building, Fire, and Traffic. ask 2: As Built and Utility Research Tetra Tech has already performed the preliminary utility research within the project area as part of our SA-2 Feasibility Study. Tetra Tech will update the utility research due to time that has passed since the previous utility research work. The topographic design survey and the boundary survey for the City selected site will be performed by Tetra Tech's in-house survey crews. The boundary survey will include setting survey monuments to mark the property corners and the recordation of a Record of Survey with the County of Orange. The level of effort for potholing and corresponding traffic control plans will be consistent with what was performed during the Well 32 Rehabilitation Project for the City and Mesa's Well Pipelines project (which involved potholing within the City of Santa Ana streets). Tack I- rP_nfP_rkni I 0--m—rlatlnne Leighton Consulting, Inc., Tetra Tech's subconsultant, will perform the geotechnical investigation for this project. Leighton is proposing to perform one boring at the PRS site (depth of 25 feet below grade) and five (5) borings along the proposed pipeline alignment (depth of 10 feet below grade). The geotechnical investigation report will include a summary of: site conditions; geologic hazards; seismicity; corrosivity; foundation design for both a vault house and retaining walls; lateral earth pressures; pipe installation requirements; and construction considerations. Traffic control per WATCH Manual will prepared for all geotechnical field work. i ask 4: Civil Operational Project Design Standard and Criteria Tetra Tech will work with the City staff to determine the applicable design standards and criteria in addition to those defined by the feasibility study. For the purposes of this proposal, we have assumed a maximum of eight (8) three (3) hour workshop sessions shall be conducted. The following is a brief summary of the various key design elements, as a minimum, to be discussed in these workshops: Pipe alignment including pipe material, thrust restraint, and traffic control concepts; PRS and hydro -generator mechanical plan layout; PRS location and construction alternatives: wall enclosure; within a building; within vault. TETRA TECH Page 110