HomeMy WebLinkAbout11 Airport Tank Rehab
AGENDA ITEM #11
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MEETING DATE: December 1, 2021
TO: Board of Directors
FROM: Neil Kaufman, Water System Engineer
SUBJECT: Award of a Contract to Perform Rehabilitation of the Airport Water
Storage Tank
APPROVED BY______________________________
Brian C. Wright, General Manager
RECOMMENDATION:
Authorize the General Manager to execute a contract with DN Tanks to perform
rehabilitation of the Airport Tank in an amount of $348,000, plus a ten percent change
order allowance for a total authorization not to exceed $383,000.
BACKGROUND:
The Airport Tank is a 500,000 gallon partially buried pre-stressed concrete tank that was
constructed in 1980. During the summer of 2010, DN Tanks performed repairs to the
dome ring of the Airport Tank under an emergency declaration. The dome ring is located
where the vertical walls and roof join together and is critical to supporting the roof structure.
The work was completed on-time and with no change orders.
In 2010, it was noted that the tank was experiencing concrete spalling from the roof on
both the interior and exterior surfaces. However, this issue was not considered critical to
the structural integrity of the tank at that time and was not included in the scope of work
under the emergency. Over the last ten years, Water Department staff have conducted
periodic concrete patch maintenance work to the roof and sidewall structures of the tank.
Based on recent inspections performed in the fall of 2020 and summer of 2021, the Airport
Tank requires substantive repairs to the roof system along with replacement of many of the
interior steel components such as the access ladder and overflow structure.
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It is expected that the rehabilitation work will require about six weeks to complete. While
the work is being performed, the Airport Well will be unavailable to serve customer
demands. The concrete work also requires that ambient temperatures do not go below
freezing for extended periods of time. Considering these operational and temperature
restrictions, successful completion of the rehabilitation work is essentially limited to the
project window of April-May or late September-October. Recognizing the specialized
nature of the rehabilitation and forecasted workloads, award of the contract at this time will
allow for the selected contractor to schedule the work for April-May 2022.
The District publicly advertised a request for bids for the Airport Storage Tank
Rehabilitation Project. A bid opening was held at 2:00 PM on November 17, 2021. One
bid was received:
TOTAL AMOUNT OF BID
Bidder Location Amount Responsive
DN Tanks El Cajon, CA $348,000.00 Yes
FISCAL IMPACT:
The price proposal from DN tanks is $348,000. It is recommended that a ten percent
change order allowance of $35,000 be established for a total authorization of $383,000.
Storage tank rehabilitation and maintenance is a component of the 10-year water capital
improvement plan. The FY2021 approved Water Budget included approximately $160,000
for water storage tank coating replacement. The tank coating replacement project was
placed on hold in preparation for this larger rehabilitation project. The approved FY2022
Budget for Water Utility includes $949,000 for this activity with the Airport Tank identified
as one of the scheduled projects.