A Fairfax County judge upheld a lower court ruling yesterday that said a 16-year-old Virginia youth charged in the fatal shooting of a Lorton construction worker last October will stand stand trial as an adult.

Circuit Court Judge William G. Plummer agreed with a Dec. 13 ruling by the Juvenile and Domestic Relations Court in which Thomas L. Grogg was certified to stand trial as an adult in the slaying of 28-year-old Hallie Hollis of Williamston, N.C.

Hollis was found last Oct. 21 in the parking lot of the Vulcan Materials Co. in Lorton, where he worked, with nine bullet wounds in the head. Hollis' car was found by police in Daytona Beach, Fla., and Hollis, his 19-year-old brother, Robert, and two female companions, both juveniles, were arrested in Sarasota. His brother also was charged in the slaying.

In a four-hour closed hearing yesterday in Circuit Court, defense attorney William B. Reichhardt, who appealed the ruling, attempted to have his client's case sent back to the juvenile court. Hollis, a slight youth from Fredericksburg, has been charged with murder, robbery and use of firearm in commission of a felony. His trial is scheduled for Feb. 18.