Park improvements and land purchases costing approximately $67.5 million are proposed in capital improvement programs announced last week by the Northern Virginia regional park authority and the Fairfax County park authority.

The two proposed capital improvement programs would require $51 million from Fairfax County residents. Park officials said they hope the money can be funded through the sale of county bonds, which will require voter approval.

The Northern Virginia regional park authority proposes spending $28.5 million to buy 3,750 acres of land and to develop various park facilities during the next six years. Fairfax County, which is one of six jurisdictions that participate in the regional agency, would pay $12.1 million as its contribution to the capital improvement program.

The other five jurisidictions would pay $7.6 million to the regional agency. Their contributions would be: Alexandria, $2.1 million; Arlington, $3.4 million; Fairfax City, $544,050; Falls Church, $241,800, and Loudoun County, $1.3 million. An additional $8.6 million to the regional agency would come from federal and state aid.

Under the Fairfax County park authority's proposed capital agency would spend $39 million to purchase 882 acres of additional park land and to fund 130 community park development projects during the next five years.

Fairfax County residents can voice their opinion of the proposed capital improvement programs at three public hearings - Monday at 8 p.m. in the cafeteria of Jefferson High School, 6560 Braddock Rd.; Tuesday at 8 p.m. in the conference room of the Massey Building, 4100 Chain Bridge Rd., and Wednesday at 8 p.m. in the cafeteria of Mount Vernon High School, 8515 Old Mount Vernon Rd.

The capital improvement program of the Northern Virginia regional park authority includes:

Bull Run Regional Park - Developments include stable complex, tennis complex, interpretive center, camp-ground improvements and the upgrading of the existing pool, playground, road and parking areas.

Bull Run Marina - Acquisition of 56-acre parcel needed to complete the park, payment of bonds issued for advance purchase of park land and the upgrading of existing roads and parking areas.

Pohick Regional Park - Development of campgrounds, golf course, interpretive center, garden complex, playground and picnic areas.

W&OD Regional Park - Development of a linear park from Alexandria to Purcellville in Loudoun County primarily for hiking, biking and horseback riding and necessary supports facilities.

Some of the projects planned by the Fairfax County park authority include:

Frying Pan Park in Centreville - Development of horse show and model farm facilities.

River Bend Park in Dranesville - New camping facilities and additional picnic and playground areas, parking and trails.

Burke Lake Park in Springfield - Additional parking, picnic and play areas and expansion of the camping area, shelters, amphitheater and rest rooms.

Mason District Park - Additional trails, exhibits and interpretive study shelter area.

Annandale Community Park - Expansion of the Hidden Oak Nature Center.

Lake Accotink Park - New picnic areas, playground, open play area, group camping area, trails and parking.

Various improvements will be made at Hemlock Overlook Regional Park, Fountainhead Regional Park, Sandy Point Regional Park, Mason Neck, Upton Hill Regional Park, Caryle House Historic Park, Potomoc Overlook Regional Park, Algontian Regional Park and Goose Creek Regional Park.