HomeMy WebLinkAboutTIS 2025-07-28 Item 1C - Bid Award - Sewer Lift Station #2 Structural Modifications with Combined Construction INFORMATIONAL MEMORANDUM
TO: Transportation & Infrastructure Services Committee
FROM: Jen Tetatzin, Public Works Director
BY: Adib Altallal, Utilities Engineer
CC: Mayor Thomas McLeod
DATE: July 25, 2025
SUBJECT: Lift Station No. 2 Structural Modifications
Construction Award
ISSUE
Award a construction contract for the Lift Station No. 2 Structural Modifications Project to the lowest
responsible bidder, Combined Construction, Inc.
BACKGROUND
Lift Station No. 2 is a critical component of the City’s sewer collection system. In 2015, upgrades
were identified to improve pump reliability and reduce maintenance needs. The City completed
major upgrades in 2022, which included new pumps, valves, and piping. As the system has been in
operation, the need for improved structural access and modifications was identified to maintain
safety and serviceability for operations and maintenance staff. This project provides structural
retrofits within the existing lift station to facilitate safe removal and replacement of pumps, including
the installation of a new steel gantry beam and hoist, modification of the concrete slab, and related
structural improvements.
DISCUSSION
The Lift Station No. 2 Structural Modifications Project was advertised for bid in March 2025 for three
weeks, and two bids were received and opened on March 25, 2025. The engineer’s estimate for the
construction work was $200,839.50. The apparent low bidder is Combined Construction, Inc. with a
bid of $282,949.52. Staff and the City’s consultant, PACE Engineers, have reviewed the bids for
accuracy and responsiveness. Combined Construction, Inc. submitted the lowest responsive bid,
which is approximately 40% higher than the engineer’s estimate. The increased cost is attributed to
current market conditions and the specialized nature of the structural retrofits within an active lift
station.
FINANCIAL IMPACT
Contract Budget (‘26)
LS2 Structural Modifications $282,949.52
Contingency (20%) $56,589.91
Total $339,539.43 $500,000.00
RECOMMENDATION
The Council is being asked to award a construction contract to Combined Construction, Inc. in the
amount of $282,949.52 for the Lift Station No. 2 Structural Modifications Project and to consider this
item on the Consent Agenda at the August 4, 2025 Regular Council Meeting.
ATTACHMENTS
Bid Tabulations
Combined Construction, Inc. Bid Package
53
Owner: CITY OF TUKWILA Bid Date:3/25/25
Project: LS #2 STRUCTURAL RETROFIT Bid Time:10:00 AM
Engineers: PACE EngineersPACE ENGINEERS Job No. 80040201
ITEM NO.
ITEM OR
TASK DESCRIPTION UNIT UNIT PRICE COST UNIT PRICE COST UNIT PRICE COST
1 Mobilization LS 1 $14,750.00 14,750.00$ 34,000.00 34,000.00$ 40,000.00 40,000.00$
2 Structural Retofit of Existing Lift Station LS 1 $135,000.00 135,000.00$ $182,400.00 182,400.00$ $440,000.00 440,000.00$
3 Modification of Inlet Drop Pipe LS 1 $5,000.00 5,000.00$ $9,680.00 9,680.00$ $20,000.00 20,000.00$
4 Site Restoration and Cleanup LS 1 $7,500.00 7,500.00$ $10,680.00 10,680.00$ $7,500.00 7,500.00$
5 Unexpected Site Changes FA 1 $20,000.00 20,000.00$ $20,000.00 20,000.00$ $20,000.00 20,000.00$
-$ -$ -$
SUBTOTAL 182,250.00$ 256,760.00$ 527,500.00$
10.20%SALES TAX 18,589.50$ 26,189.52$ 53,805.00$
TOTAL BID 200,839.50$ 282,949.52$ 581,305.00$
Error in Bid
Apparent low bidder
BID TABULATION
General Mechanical
I hereby certify that this tabulation represents all bids received and that
the total bid prices have been checked or corrected based on the unit
prices provided in the bids. Corrections did not change the order of the
bids, unless noted otherwise.
ENGINEER'S ESTIMATE Combined Construction
https://tukwilawa.sharepoint.com/sites/publicworks/engineering/Shared Documents/Projects/A- SW Projects/LS2 Structural Modifications/01 - Preliminary Engineering/Draft Bid Documents/LS 2 Bid Tab
Form 4/16/202554
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