A northern California city announced Friday that it is seeking to fire one of its police officers and discipline eight others implicated in a wide-ranging sexual abuse scandal involving the teen daughter of a dispatcher.

Richmond police Chief Allwyn Brown is pushing to demote one officer and suspend two others without pay. Brown wants to send letters of reprimand to five other officers. The city's manager must approve the recommendations before they take effect, and the officers can appeal to an arbitrator.

Brown didn't release the name of the officer he wants to fire. Richmond is 12 miles east of San Francisco.

The Alameda County district attorney has criminally charged five officers from other departments implicated in the scandal.

Oakland police Officer Brian Bunton, 40, on Friday pleaded not guilty to a felony obstruction charge. He is accused of warning the teen to stay away from an intersection known for prostitution because of an ongoing police operation.

Bunton didn't comment after the hearing. Bunton's lawyer Dirk Manoukian told local media outlets that his client has expressed remorse.

The 19-year-old woman says she worked as a prostitute and exchanged sex with officers for money or protection from arrest. She says she has had sex with 30 northern California officers, four of them before she turned 18.

Her lawyers say the teen is no longer working as a prostitute. She is now receiving psychological care at Stanford University, they say.

The Associated Press generally doesn't identify the victims of sex crimes.