Explanation
1. BACKGROUND
This ordinance authorizes the Director of Public Utilities to enter into a contract modification to start detailed engineering design services with ms consultants, inc. for the Fourth Water Plant Transmission Main project, CIP #690502-100001, in an amount up to $901,234.82.
This modification is to begin detailed design work including survey, soil borings, and base mapping for the design of water transmission mains that will be constructed in conjunction with the City’s future fourth water plant. The transmission mains will extend from the fourth water plant located at 5992 Home Road, Delaware, Ohio, to a strategic connection point in the City’s existing water distribution system, specifically the Cleveland/Henderson pressure district.
The initial contract funding was for preliminary design services (Phase 1 of the contract). Modification #1 added preliminary design services for new Scioto River/Griggs Reservoir crossing(s) into the Cleveland/Henderson pressure districts and associated transmission main alignment(s) to connect the Fourth Water Plant transmission mains. The existing waterlines crossing the Scioto River do not have the capacity to convey flows from the future Fourth Water Plant, based on projected plant capacity. This current Modification (Modification #2) is needed in order to maintain the project’s schedule to have at least one transmission main constructed by 12/31/28 by beginning on the first stages of Detailed Design for the chosen alignment. These early-stage services are only for Survey, Base Mapping, and Geotechnical work.
There are two additional planned contract modifications. One contract modification will be for Phase 2 (remainder of detailed design services). The final planned contract modification will be for Phase 3 (engineering services during construction).
The majority of the transmission main will be located outside the City of Columbus. The portion within the City of Columbus will be l...
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