Fairfax County Board Chairman John F. Herrity yesterday grumbled once again about a troublesome prison in the county.

Only this time he wasn't grousing about the District-run Lorton prison. It was Virginia's state-run Camp 30 Correctional Unit, located west of Fairfax City.

Herrity demanded to know the fate of an agreement that was to provide better notification procedures in the event of an escape from the camp. But no one -- local police, corrections officials or even the state attorney general's office -- could answer his questions yesterday.

The camp's superintendent, David K. Smith, said the agreement "has been gone from here since, I'd say, the end of April or early May."

"It's not here," said Warren Carmichael, Fairfax County police spokesman. "The best I can tell you is that it is somewhere between the regional corrections office and Richmond."

"I don't know where it is . . . , " said Edward Morris, northern Virginia regional administrator for the state Department of Corrections since July 1. "That's one of my first priorities -- to find out what happened to it."

"I know I've never seen it," said Edward Murray, a deputy director of the state Department of Corrections.

"We're not sure where it is," said David Hathcock, director of information for the state attorney general's office. "Nobody remembers anything about it."

The agreement, drafted last spring between the county and state corrections officials, requires that Camp 30 officials sound a warning siren three times after an escape, and notify certain prison neighbors by telephone.

At Herrity's request, the county Board of Supervisors voted yesterday to write Gov. Charles S. Robb to ask where the agreement is and when it will be signed. They also are demanding to know the type of prisoners being held at Camp 30, near the intersection of West Ox Road and Lee Highway.

Camp 30 is a minimum- to medium-security facility for about 160 state prisoners who are about to be discharged or paroled, Murray said. Although the inmates are serving time for a variety of crimes, including theft and drug dealing, none is considered desperate or dangerous, he said.