OPDEV.

Narrative

AFTER WORKING A SPC ACFT ON NOV/XX/94 (DEP) A MIC HELI CALLED REQUESTING VFR DEP TO SE. TFC LEVEL WAS HVY DUE TO BACKLOG CREATED BY SPC ACFT DEP. FREQ WAS CONGESTED; I HEARD THE HELI SAY AT THE (GARBLED) RESERVE. SINCE ALL VIP ACFT WERE LOCATED AT THE AIR FORCE RESERVE ON THE N SIDE OF THE FIELD; I MADE THE ASSUMPTION THAT THE HELI MEANT THE RESERVE RAMP. WE ALSO HAVE A NORMAL RESERVE RAMP THAT ISN'T NORMALLY USED FOR ACFT OPS. I GAVE INSTRUCTIONS TO THE HELI TO DEPART VFR SE TO REMAIN N OF RWY 11L AS OPS WERE BEING CONDUCTED ON BOTH RWYS 11L AND 11R; THINKING ACFT WOULD BE N OF ALL OPS. IN REALITY; COPTER WAS BEHIND A NAVAL HANGAR BTWN THE PARALLEL RWYS. WHILE WORKING ACFT ON RWYS 11L AND R AND KEPT SCANNING THE AIR FORCE RESERVE RAMP FOR THE HELI. IMAGINE MY SURPRISE AS THE COPTER ROSE ABOVE THE NAVAL HANGAR TO MY R BTWN THE PARALLEL RWYS; I QUICKLY GAVE INSTRUCTIONS TO THE HELI TO AVOID CONFLICT. ALTHOUGH NO SEPARATION WAS LOST; THIS WAS A BAD OP/ASSUMPTION ON MY PART AND POTENTIALLY A HAZARDOUS SIT.