CITY COUNCIL AGENDA ITEM
ACTION REQUESTED:
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Approve the award of Change Order #1 to Contract 21-355, Tollway Substation Reliability Upgrade, to Sargent & Lundy, LLC for an amount not to exceed $902,000 and a total award of $1,241,240 and for an additional 12 months
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DEPARTMENT: Electric Utility
SUBMITTED BY: Brian Groth
BOARD/COMMISSION REVIEW:
N/A
BACKGROUND:
The Naperville Electric Utility (Utility) - Tollway Substation has experienced several 34.5kV bus flashovers in recent years. These flashovers cause extended outages to critical industrial and commercial customers along the I-88 corridor. The primary cause of these failures is due to salt contamination from the tollway. Relocating the 34.5kV bus indoors will eliminate the primary cause of failures.
In February 2022, the City Council awarded Contract 21-355, Tollway Substation Reliability Upgrade, to Sargent & Lundy with a completion date of December 31, 2025. The purpose of this contract is for the development of a complete engineering design, construction support, and as-built incorporation for the Tollway Substation to address the reliability concerns.
This Change Order is requested to support a scope change from the original award.
DISCUSSION:
The original award to Sargent and Lundy was to create the specifications for bid of a prefabricated aluminum control building to house indoor 34kV switchgear. Once the specification was created and indicative pricing was received for the control house from vendors, it was determined that an aluminum building is not the best design choice for the price. In particular, the project team was concerned salt spray will corrode the control building causing leaks at building seams. Members were also concerned the overall higher-than-expected cost of the aluminum control building suggests that another approach would better suit the Utility. The project team now believes that, for a similar cost, a building constructed from tip-up concrete walls and/or b...
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