The 1,300 acre park lies within Irvine and is funded and operated by the city.
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The city says the change will cost about $360,000 for things like new signs and uniforms.
Attractions include the Great Park Balloon, Farmers Market and Sports Complex.
The park land was previously the site of the Marine Corps Air Station El Toro. In 2001, Orange County voters authorized the land's development as a park.
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Development of the site continues, with plans for a water park, amphitheater, museums and other facilities.