A320
Air Traffic Control Fully Certified
Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict
Air Traffic Control Issued New Clearance; Air Traffic Control Separated Traffic
Procedure; Airspace Structure; Human Factors
Had a C172 enroute to SMO maybe 4 miles east of LGB at 4;000. LBG Tower flashed a release for an A320; which I accepted. My plan was to keep the A320 at 3;000 until in front of the slow moving Cessna. LGB Tower called to say the A320 was going to be a couple minutes late on his release because they were getting jammed on final. Swiss cheese hole 1: Now my plan was to turn the Cessna up along the boundary to get out of the way of the A320 when he departed. But; DOWNE Sector called to use the racetrack and descend an aircraft to 5;000 (swiss cheese hole 2). This tied my hands a little on running the Cessna tight to the line. Now my plan was to turn the A320 out to a 250 heading to get divergence from the Cessna. However; when I turned the A320 out there was a VFR aircraft opposite direction at 2;500; which I assumed was descending for LGB; swiss cheese hole 3; but upon rechecking the situation; I noticed the VFR at 2;800. I turned the A320 to a 270 heading and he got an RA from the VFR aircraft. I then climbed the A320 to 6;000 as per the handoff. I think there should be a bit of a redesign on the Bravo Airspace; or a Class Charlie Airspace to cover LGB for this departure as well as the LGB...VTU departure. On my side; once I notice the situation I should have cancelled the release with LGB; or told DOWNE approved with the racetrack and shown my traffic (C172) and requested a point out at 4;000. Also never assume what a VFR aircraft is going to do.
SCT Controller described a conflict event when an IFR release from LGB was delayed and plans to handle a VFR aircraft failed to materialize. The reporter suggested airspace changes that might prevent future occurrences.