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The crash happened just after 11 p.m. at the intersection of Portola Drive and Claremont Avenue, when the vehicle turned left onto Claremont Avenue and hit the 2002 Honda scooter, sending the woman to San Francisco General Hospital with life-threatening injuries, according to police.
The woman later had to have one of her legs amputated below the knee, police said.
Oakland resident Felica Stenson, 35, was arrested and booked on a felony charge of driving under the influence, according to police.
Stenson is being held in San Francisco County Jail on $50,000 bail, according to the sheriff's department.
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