The following were among actions taken by the Fairfax County Board of Supervisors at its Oct. 29 meeting. For more information, call 246-3151.

DOWNZONING CASE APPEALED -- The board voted 6 to 3 to appeal a judge's decision to overturn tough development restrictions the board adopted last year. The supervisors argued that the judge had infringed on the board's authority to make decisions on local planning and zoning issues.

If the state Supreme Court agrees to hear the case, arguments may be scheduled for next fall, according to attorneys.

To slow development, the board adopted a "downzoning" ordinance last year that reduced -- by as much as half in some cases -- the amount of commercial development allowed on about 14,000 acres in the county. The ordinance angered many county landowners who said the board's decision infringed on their property rights.

Earier this month, Judge William G. Plummer of the Fairfax Circuit Court overturned the ordinance, saying it was improperly drafted and too vague to stand up in court.

Board Chairman Audrey Moore and Supervisors Martha V. Pennino (D-Centreville), Lilla Richards (D-Dranesville), Gerald Hyland (D-Mount Vernon), Sharon Bulova (D-Annandale) and Kate Hanley (D-Providence) voted to appeal the court's decision. Supervisors Thomas M. Davis III (R-Mason), Joseph Alexander (D-Lee) and Elaine N. McConnell (R-Springfield) voted against the move.

LANDFILL STUDY DELAYED -- The board voted unanimously to delay asking a private firm to conduct an environmental study of a proposed site for expansion of the I-95 landfill. The decision was made primarily because some citizens have expressed concern about the results of an earlier study of the issue by the firm.

The landfill is expected to reach capacity by 1994, and the board wants to expand the space by about 147 acres -- which is expected to add about five years to its use -- provided the expansion would not seriously harm the environment.

An environmental assessment conducted earlier this year by the consulting firm of Post, Buckley, Shuh and Jernigan determined that the environmental consequences of expanding the landfill would not warrant abandoning the project. However, after many Lorton residents appealed to public officials, Sen. John Warner (R-Va.) and Rep. Stan Parris (R-Va.) amended a congressional appropriations bill to require a more thorough environmental study.

Following citizens' criticism of the consulting firm's report, board member Hyland, who represents the Lorton area, objected to the staff's recommendation to hire the firm to do a second study. At Hyland's request, the board delayed a request for the study for 30 days to allow time for more public comment.

According to the staff, finding another consultant to do the study would delay the project by about a year and increase the cost by about $200,000.

Town of Herndon

The following were among actions taken by the Herndon Town Council at its Oct. 23 meeting. For more information, call 435-6800.

CHESAPEAKE BAY PRESERVATION -- The council, contributing to regional efforts to control pollution of the Chesapeake Bay, adopted tighter environmental restrictions on residential, industrial and commercial development throughout Herndon, with restrictions tightest near streams.

The state now requires many area jurisdictions to create preservation overlay districts on fragile lands to reduce development and agricultural runoff that carries dirt and chemicals to the bay and its rivers.

The town's two major streams, Sugarland Run and Folly Lick, drain into the Potomac River, which eventually drains into the bay. Under the new restrictions, new development within 100 feet of these streams would be restricted mainly to recreational development.

Elsewhere in town, residents and developers proposing to build structures or additions of at least 2,500 square feet will be required to first analyze the potential impact on the water quality, and must take extra steps to prevent or reduce water pollution, such as erecting silt fences to block soil erosion.