Explanation
1. BACKGROUND
This ordinance authorizes the Director of Public Utilities to enter into construction contract modification for the Big Walnut Trunk Extension (Phase 2) project, CIP #650033-100002, with the Obayashi Corporation in an amount up to $14,000,000.00.
The Big Walnut Trunk Extension project is an extension of the Big Walnut Sanitary Trunk Sewer north of Central College Road and east of Hoover Reservoir. This project will provide sanitary sewer service for the rapidly developing area between Hoover Reservoir and the Village of New Albany, north of State Route 161.
This contract modification is to pay for the work associated with the use of a road header machine to complete tunnel boring from the opposite direction. The original tunnel boring machine became inaccessible due to excessive levels of methane encountered which halted drilling. In addition, excessive amounts of pyrite were encountered during the tunnel boring which was unanticipated and significantly slowed boring operations. Shaft and tunnel mining operations have been completed even with the significant differing site conditions encountered. The remaining work includes: pipe installation and annular space grouting, shaft installation and backfill, and final restoration. Funding must be added to complete these tasks due to the extra expense associated with the unexpected site conditions.
Contract work was required to be completed in a manner acceptable to the City within 1,250 days of the date of Notice To Proceed (NTP) given by the City. This contract modification will include an extension to the contract duration of up to 180 calendar days.
Planning area = “99-Citywide”
1.1 Amount of additional funds to be expended: $14,000,000.00
Original Contract $81,491,778.00 (PO371241 / ORD 3581-2022)
Current Modification $14,000,000.00
Future Modifications $0.00
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