MARTINEZ, Calif. (AP) _ Medical clinics were closed and emergency surgery called off today after county workers went on a one-day strike to push stalled contract negotiations.

More than 4,000 Contra Costa County workers have been without a contract for nine months.

``We need something to get the Board of Supervisors to move,'' said Jere Copeland, business agent for Local 1 of the Public Employees Union.

Talks were scheduled to resume Thursday.

The union wants a two-year contract with 4 percent annual raises, better retirement packages and less use of temporary employees, Copeland said.

The county has offered a three-year package with a bonus the first year and 2 percent raises the next two years, he said.

Union workers included clerks, janitors and licensed vocational nurses. Deputy sheriffs settled their contract negotiations recently and will not walk off the job. Neither will firefighters, according to the union.

The county said management has been preparing for the walkout for about a week.