The following were among actions taken by the Fairfax County Board of Supervisors at its Monday meeting. For more information, call 691-3187.

SPRINGFIELD BYPASS -- The board, finalizing plans on a vast portion of the Springfield Bypass, unanimously approved the locations of 18 interchanges and 49 intersections along the proprosed 35-mile roadway. The proposal for the bypass now goes to the state, where the Commonwealth Transportation Board is expected to vote on the plans later this month.

The proposed bypass, which will stretch from Rte. 7 near Herndon down to Rte. 1 in the southeastern part of the county, is seen by county officials and politicians as a key element in the county's attempt to alleviate traffic congestion. Last fall the Virginia Department of Transportation held public hearings on the bypass, and the plans approved by the board on Monday included concerns raised by citizens at those hearings about proposed interchanges and intersections along the roadway.

If approved by the Commonwealth Transportation Board, the Virginia Department of Transportation can begin buying land along the route of the bypass and complete construction plans.

BASKETBALL HOOPS -- The board, endorsing a change in the county zoning ordinance regulating basketball hoops, tentatively approved a plan to make free-standing basketball hoops legal but restrict the hours during which they can be used.

The move came about a month after an article appeared in The Washington Post revealing that free-standing hoops are illegal in Fairfax County. According to county zoning officials, however, the law has been enforced only one time, about five years ago.

"The present ordinance obviously isn't enforceable because we have thousands of these things around the county," said Supervisor Thomas M. Davis III (R-Mason.) "It's obvious that the community has decided to play ball anyway," said Supervisor T. Farrell Egge (R-Mount Vernon).

Supervisor Nancy K. Falck (R-Dranesville), who along with Supervisor Joseph Alexander (D-Lee) voted against the move, argued that the proposed change was not enforceable. Falck said the current law is much easier to enforce than the proposed change, which would permit the residents to use the hoops from 8 a.m. to 8 p.m. The board is expected to give final approval to the new law later in June.

BUILDING INSPECTORS -- The board, in an attempt to keep up with the rising workload experienced by county building inspectors in charge of regulating the county's building and development boom, approved $321,000 to hire more contract personnel to go along with the permanent county staff of inspectors.

Last fall, following protests from county builders upset about delays in getting their projects approved, the county hired about 90 contract inspectors to handle the increasing workload. At the time county officials said they were having trouble keeping building inspectors, many of whom were being lured away by higher salaries in the private sector.

At Monday's meeting County Executive J. Hamilton Lambert said that he preferred hiring contract personnel instead of additional permanent staff during the current building boom because the contract personnel could be laid off when the building boom slows and the workload for inspectors decreases.

DOG LEASH LAWS -- In an effort to punish dog owners who refuse to reign in their dangerous animals, the board voted to increase the penalty for violating the leash law from $100 to $500. Supervisor Davis said the measure was needed because some dog owners are ignoring the leash law. "We have neighborhoods that have been terrorized" by unleashed dogs, Davis said.