The plans will see overnight fire crews relocated from Cheltenham to Cinderford.
The Fire Brigade Union said the cuts were 'unsafe' and underfunding could have serious consequences.
The fire broke out at the privately-owned, unregistered waste site at Over, Gloucester.
Volunteers have been mopping and jet-washing to get the building ready to host an England World Cup match.
The fire service says several roads are closed while crews tackle the blaze.
The Gloucestershire base is being used by the United States Air Force to launch operations against Iran.
Nine fire engines were sent to the scene to extinguish the blaze.
After several serious house fires, people are given advice in the hope of preventing future blazes.
The agreement comes after two days of “intensive” negotiations during the summer months.
