The Ada City Council unanimously approved two change orders Monday that would boost the cost of building the new Glenwood Pool to about $4 million.

The city is replacing the old Glenwood Pool, which was built in the 1950s, with a new pool. Branco Enterprises is the general contractor on the project.

When construction workers started excavating the old pool, they discovered the existence of an older, narrower pool, public information director Lisa Bratcher said Tuesday. That discovery prompted the first change order, which covers the cost of excavating the previously unknown pool.

Excavating the older pool will cost the city $29,724, according to information from City Hall. The original contract price was about $3.87 million, but the change order raises the new price to about $3.90 million.

The second change order concerned the contractor’s costs for added excavation, demolition and placement of structural fill material. That change order boosts the total contract price from about $3.90 million to approximately $4.01 million.

The council was originally scheduled to consider the change orders at a Sept. 12 special meeting, but City Manager Cody Holcomb asked the council to postpone action until this week. Bratcher said Tuesday that Holcomb had requested the delay so officials would have more time to explore various options.

The Glenwood Pool replacement project is financed with part of the proceeds from the second “Penny for Our City” sales tax, which funds a series of capital improvement projects. The sales tax also provided funds for building the new Wintersmith Aquatic Center, which opened in August.

In other business, the council accepted the Federal Aviation Administration’s offer of a grant to help cover the cost of building a new apron at Ada Municipal Airport, which will connect the existing terminal ramp and taxiways to the new terminal building.

The federal government will provide up to $345,000 in grant money for the project, and the city will contribute an additional $38,333 for a total of $383,333, according to City Hall.

Eric Swanson is the City Hall and general assignment reporter for The Ada News. He spent 15 years working at the Dodge City Daily Globe in Dodge City, Kansas, before joining The Ada News’ staff in 2012.