Arlington County Manager Larry J. Brown yesterday proposed a $28 million fall bond referendum that would include money for a new police headquarters, road improvements, a central library addition and neighborhood improvements.

The County Board will not decide until August which projects to put before the voters, but it began the review process yesterday by examining Brown's recommended list of $161.2 million in capital improvements for the next six fiscal years.

There will be a June 28 hearing on the proposed long-range projects.

The largest single bond issue Brown recommended for the Nov. 4 ballot is $15.1 million for government facilities. It would finance the estimated $10 million cost of a new police department headquarters, a $4 million expansion of the central library, and $1.1 million to relocate the antiquated Columbia Pike fire station.

Anna Lee Berman, director of the county's management and finance department, said the exact cost of the library addition probably will be determined in May or June, when a study on the library's needs is completed.

Of the $161.2 million, Brown is proposing that $96.1 million be financed through bond sales and $65.1 million on a pay-as-you-go basis, in which each project is paid for by revenues that year.

No bond referendum is recommended for school or utility projects this fall. The schools, which are conducting a comprehensive review of capital needs, have been including an increasing number of pay-as-you-go projects in the school budget in recent years.

The police department is scheduled to move most of its divisions from their current site next to the county courthouse this summer, when work on the Court House Plaza high-rise complex is scheduled to begin. The complex will be built on county land that is now used for a parking lot, of which police patrol cars are the largest single occupant. Space now used by the police department is expected to be used for expanding the jail.

The county hopes to relocate the police department somewhere on the Army's vast Arlington Hall Station compound off Rte. 50 between Glebe Road and George Mason Drive. The compound is being transferred to the State Department's Foreign Service Institute, which has indicated a willingness to let the county use portions of the site.

Brown is also recommending a $4.6 million parks and recreation bond for the development of park areas and the renovation of recreation centers.

He recommended a $4.3 million transportation bond issue for improvements to streets and highways.

Brown also suggested a $4 million bond referendum for community conservation and beautification projects, which would include improvements to neighborhoods, apartments and business areas.