A Fairfax County public works employee found dead Monday in a storm drain manhole was identified yesterday as Philip G. Miley, a 22-year employee of the maintenance and storm water management unit.

Police have ruled out foul play, but the cause of Miley's death remained a mystery yesterday.

Miley, 57, of Centreville was found in the 11400 block of Random Hills Road about 7:30 p.m., where he had gone earlier in the evening to do an inspection, said Debra Bianchi, a county spokeswoman. It was the first work-related death of a county employee in at least five years, she said.

Bianchi said the U.S. Department of Labor's Occupational Safety and Health Administration, with the county's help, will review the incident. She said a team of investigators was trying yesterday to reconstruct the events leading to Miley's death and that the findings will be forwarded to county officials.

A phone message left for an OSHA spokesman was not returned yesterday.

County police were called to the scene by someone who noticed that the manhole cover had been removed. After finding Miley's body, police investigated, said Mary Ann Jennings, a police spokeswoman.

Jennings said police detectives, who respond to all sudden or seemingly unnatural deaths, concluded that Miley was not the victim of a homicide and that no apparent foul play was involved in his death. The findings were sent to county administrators, who assumed responsibility for the investigation.

Bianchi said the investigation will focus on issues of safety and what Miley was doing when he died. Natural causes, such as a heart attack, were not being ruled out, she said.

Miley joined the public works department in October 1983 and worked as an engineering technician, Bianchi said. His relatives could not be reached yesterday.

Staff writer Tom Jackman and staff researcher Bobbye Pratt contributed to this report.