The following items are on the Sept. 12 agenda for the Fairfax County Board of Supervisors. The meeting will be in the board room on the a-level of the Massey building, 4100 Chain Bridge Rd., Fairfax 10 a.m.

Approval of the minutes.

Presentation of the final report of the Fairfax County Festival Citizen's Committee.

Appointments to citizen boards, authorities, commissions and advisory groups.

Board members' items. 11 a.m. County executive's items. 11:30 a.m. County attorney's items. 2 p.m.

Public hearing on the proposed amendment to the county's three-year housing assistance plan and annual housing assistance goals. The proposed amendment would increase by 100 the three-year goal for housing units to be rehabilitated. The number of proposed new units would be reduced by 100. Thirty-five of the units to be rehabilitated would be part of the 1982-83 annual housing assistance goal, reducing the proposed number of new units by the same number. 2:30 p.m.

Public hearing on an application by the board to rezone approximately 170 acres of the Galanis Woods, Moore and Keith, and Pleasant Ridge subdivisions, generally west of Annandale Road, from three residential units an acre to two units an acre.

Mason District.

Public hearing on rezoning and special applications by Tycon Beltway Limited Partnership to rezone approximately four acres in the Hollinswood subdivision from residential and retail space to office space with a 120 foot maximum height. The board also will consider the applicant's proposal to consolidate additional parcels of land and to alter the design and square footage of previously approved structures on Rte. 7 next to Tysons Corner. The plot to be considered is approximately 12 acres of high-rise office space. Providence District

Public hearing on the county's proposal to give up title to portions of Dogwood Lane, Gander Place and Mimosa Drive. Providence District 3:30 p.m. Decision on rezoning application by Anton Yergat and C. Douglas Adams to rezone approximately five acres on the southwest corner of Little River Turnpike and Beauregard Street from limited office space to office-retail space. Mason District

Public hearing on Dravco Food, Inc.'s request to build a fast-food restaurant at 4221 John Marr Dr., a stretch of road with use restrictions. Dranesville District

Public hearing on a request by Lucas Gallegos to waive minimum requirements governing the number of homes per acre within his 168,900 square foot subdivision on Old Chesterbrook Road. 7 p.m.

Public hearing on the proposed adoption of a resolution appropriating additional funds for the county for a 12-month period ending June 30, 1984.