HomeMy WebLinkAboutBoard - Airport Tank Rehab Closeout
Closeout of the Airport Storage Tank ACTION ITEM #15 October 5, 2022 Rehabilitation ProjectCloseout of the Airport Storage TankRehabilitation Project
•BACKGROUND / HISTORYBACKGROUND / HISTORY Closeout of the Airport Storage Tank Rehabilitation ProjectCloseout of the Airport Storage Tank Rehabilitation Project time with no change orders-Work
was performed on•Dome ring is located where the vertical walls and roof join together•under an emergency declarationDuring summer of 2010, DN Tanks performed repairs to the dome ring
•tank that was constructed in 1980stressed concrete -The Airport Storage Tank is a partially buried pre
•BACKGROUND / HISTORYBACKGROUND / HISTORY Closeout of the Airport Storage Tank Rehabilitation ProjectCloseout of the Airport Storage Tank Rehabilitation Project and overflow structure
is also neededReplacement of interior steel components such as the access ladder •necessarywere Based on recent inspections, substantial repairs to the roof •the roof exterior with
limited successWater Department staff have applied concrete patches to Since 2010•emergency scope of workNot considered critical at that time and was not included in the •interior and
exterior surfaces of the roof structurewas occurring on both spallingit was noted that concrete In 2010
•NEW INFORMATIONNEW INFORMATION Closeout of the Airport Storage Tank Rehabilitation ProjectCloseout of the Airport Storage Tank Rehabilitation Project Total authorization of $383,000•$35,000
change order allowance was established•Contract awarded to DN Tanks at December 1, 2021 Board Meeting•Bid was responsive•Bid price of $348,000.00•DN Tanks of El Cajon, California•One
bid was received•Bid opening was held on November 17, 2021
•NEW INFORMATIONNEW INFORMATION Closeout of the Airport Storage Tank Rehabilitation ProjectCloseout of the Airport Storage Tank Rehabilitation Project Change order of $28,276.71 for
additional roof repair work•Damage to the tank roof was more extensive than anticipated•Exterior work continued through June 2022•placed back into serviceAirport Well •In late May 2022,
interior work was completed•DN Tanks began work in April 2022•Rehabilitation work requires temperatures above freezing•Airport Well not available during the rehabilitation work•Work
was scheduled for spring/early summer of 2022
•NEW INFORMATIONNEW INFORMATION Closeout of the Airport Storage Tank Rehabilitation ProjectCloseout of the Airport Storage Tank Rehabilitation Project No observable seepage at this time•workepoxy
injection In early September, DN performed additional •continuing seepageIn late August, the District sent DN photographs documenting the •Some seepage continued •District agreed to
revisit the issue later in the year•occurDN stated that additional time was needed for chemical reactions to •this issueDN had performed epoxy injection at a number of locations to
address •wall were observedDuring June punch list inspection areas of seepage through the tank
•FISCAL IMPACTFISCAL IMPACT Closeout of the Airport Storage Tank Rehabilitation ProjectCloseout of the Airport Storage Tank Rehabilitation Project construction inspection on this projectThe
District has incurred additional outside expenses for •Total contract amount of $376,276.71•Amount of $28,276.71•One change order for additional roof repairs was approved•Total authorization
of $383,000•Change order allowance of $35,000 was established•Bid price from DN Tanks was $348,000
•RECOMMENDATIONRECOMMENDATION Contract to Perform Rehabilitation of Airport Storage TankContract to Perform Rehabilitation of Airport Storage Tank CompletionNotice of project as complete
and authorize the filing of the Rehabilitation Airport Storage Tank 19 accepting the -2022Adopt Resolution