The Arlington County Board tentatively agreed last night to ask county voters to approve bond issues totaling $15.3 million to purchase and develop parkland and finance street improvements.

The board will make a final decision whether to schedule a November referendum on the bond issues after a public hearing in August.

Nearly half the proposed bond issues- $7 million-would go for park acquisition and development, including the possible purchase of two large, vacant tracts in North Arlington. Some of that money also would be used for developing small urban parks along the Rosslyn-Ballston subway corridor.

Several residents urged the board last night to buy the 20-acre Hendry tract on North 24th Street and the 6-acre Gaddy tract off Military Road should the owners of those parcels decide to sell them. The tracts are valued at $1.4 million and $463,000, respectively.

"We need to do all we can to save good parcels of land," Gerald Tobin, chairman of the county's Park and Recreation Commission, told the board. "We need large tracts where wildlife can live and our children can see nature at work."

Included in the proposed bond issues is $4.6 million to fund sidewalk and street improvements, $2 million for sewer construction, and $1.7 million as Arlington's contribution to the Northern Virginia Regional Park Authority.