WALNUT CREEK -- The city is still working to reach a deal with the city's police captain, lieutenants and sergeants on a new contract.

The city's contract with police management, which covers a wide range of topics including graveyard shift pay to uniform allowance, expired in September 2012.

The Police Management Association has held several closed-door meetings with city officials, including one on Monday. The city will not comment on what has held up negotiations and will not give an estimate of when an agreement is expected. No updates were given at Tuesday's City Council meeting.

In contrast, the city's rank-and-file officers reached an agreement with the city in August 2012.

The last agreement with police management was reached in July 2010, when city officials were looking to cut costs and reform pensions in the midst of the recession and police were advocating for hiring more officers. Under the 2010 agreement, police are required to pay10 percent of their Kaiser Permanente HMO health plan.

The city's rank-and-file officers July 2012 agreement also requires that officers pay toward their health care premiums.

That contract also reformed officers' pension structure into a two-tiered system. Neither the city nor the union group would say whether negotiations are being held up by further attempts by the city to reform pension and health benefits.

The Police Officers Association negotiates separately from the Police Management Association.