Samantha Emslander, from Galt in Sacramento County, was in a convertible with another occupant, that crashed into a ditch on the side of the Bernal Avenue on-ramp around 12:20 a.m., according to CHP and the coroner's bureau.
Emslander was killed in the crash, while the other victim suffered unknown injuries, CHP Officer James Evans.
Evans said the driver reportedly had fallen asleep at the wheel. The incident remains under investigation.
Emslander's Facebook profile lists her as a 2007 graduate of Galt High School and working at Raley Field in Sacramento as a ticket operator.
She also posted she is in the U.S. Air Force.
Her hometown's Galt Herald online newspaper included a brief about Emslander in October 2009 after she graduated from basic military training at Lackland Air Force Base in San Antonio, Texas, according to the article.