MARIETTA — Cobb County Fire & Emergency Services is expected to add three new engine trucks to its fleet within the next week, Cobb Fire spokeswoman Denell Boyd said.

The trucks, purchased from Pierce Manufacturing of Appleton, Wis., will replace existing engines at Station 1 at 5651 Mableton Parkway; Station 2, at 208 Barber Road in Marietta; and Station 8, at 2380 Cobb Parkway in Kennesaw. The trucks, which cost $497,000 each, are being funded with money from the 2011 SPLOST 1 percent sales tax.

While two of the trucks will have 25-gallon foam tanks, the truck at Station 8, located near Cobb County Airport at McCollum Field, will be specially equipped with a 65-gallon foam tank designed to handle fires from airplane accidents.

The Station 8 engine will also be capable of spraying foam while it is moving, something other trucks can’t do, something that could allow it to cover an entire runway if needed.

“Obviously, you can spread over more area,” Boyd said. “You’re not confined to one spot.”

Boyd said the county’s fire engines typically are used full-time for 12 years and for 5 years in reserve.

Early next year, the county will add two ladder trucks, purchased from Sutphen of Amlin, Ohio. The trucks, which cost $1.1 million each, will replace trucks at Station 22, 4700 Austell Road in Austell, and Station 4, 1901 Cumberland Parkway.

“The ladder trucks are used at the big fires, the apartment fires, because they have to reach up high,” Boyd said.

Ladder trucks have a slightly longer lifespan than engines, with 15 years on the front lines and five years in reserve, Boyd said.

The Cobb Board of Commissioners approved the truck purchases at its Feb. 14 meeting.

Boyd said the county was able to save money by buying several trucks at once.

“I’m glad to see that the county does consider budget as if it was money coming out of your own pocket,” she said.