HomeMy WebLinkAbout15 Airport Tank Rehab AwardAM TRUCKEE DONNERAGENDA
Public Utility District
MEETING DATE: October 6, 2021
TO: Board of Directors
FROM: Neil Kaufman, Water System Engineer
SUBJECT: Consideration Award of a Contract to Perform Rehabilitation of the
Airport Storage Tank
APPROVED BY
RECOMMENDATION:
( - _: - C _/_ � /-/- �/
Brian C. Wright, General Manager
Authorize the General Manager to execute a contract to DN Tanks to perform rehabilitation
of the Airport Tank in an amount of $349,700, plus a ten percent change order allowance
for a total authorization not to exceed $385,000.
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 periodically
conducted concrete patch work to the roof in order to extend the life of the coatings.
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.
Page 1 of 2
It is staff's understanding that there are only a few contractors nationwide with the
experience and capability to perform work of this nature. Most of these companies are
located in the eastern and southern areas of the country with DN Tanks as the only firm
that has a strong west coast presence. Based on DN Tank's specific expertise in this field
of work and their strong familiarity with the specific structural details of the Airport Tank
(having conducted the previous emergency rehabilitation work), staff has determined the
rehabilitation of Airport Tank to be a sole source procurement and there to be no material
benefit for the District to seek competitive bids. DN Tanks has provided a price proposal of
$349,700 to perform the necessary work.
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 temperatures do not go below freezing for
a relatively lengthy period of time, period beginning with the start of construction and
extending through the curing phase of the concrete work. Considering both of these
operational and construction restrictions, this rehabilitation work can only be performed
during the period of April -May or late September -October. DN Tanks has tentatively
placed the Airport Tank work onto their schedule for the April -May 2022 period. Approval
of the rehabilitation contract at this time will ensure that the project can be scheduled and
performed at the time most advantageous to the District's water utility operations.
1.05.020 Objectives:
1. Responsibly serve the public.
6. Manage the District in an effective, efficient, and fiscally responsible manner.
1.05.030 Goals:
3.4. Conduct effective and efficient operations, maintenance, and replacement programs.
FISCAL IMPACT:
The price proposal from DN tanks is $349,700. It is recommended that a ten percent
change order allowance of $35,300 be established for a total authorization of $385,000.
Tank rehabilitations are a component of the 10-year water capital improvement plan and
the draft FY2022 Budget for Water Utility includes this capital expenditure of $385,000.
ATTACHMENTS:
None
Page 2 of 2