Medium Transport; Low Wing; 2 Turbojet Eng
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 4
Distraction; Confusion; Situational Awareness; Communication Breakdown
Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Separated Traffic
Human Factors; Procedure
I was working the Manhattan sector when I approved Aircraft X to be released off HHR airport and I would talk to aircraft right on departure; (Normally the LAKR sector does that).  When I first talked to Aircraft X he was out of 015 for 030 with traffic in his 12 o'clock and 2 miles at 025.  I had to immediately stop Aircraft X at 020.  HHR was talking to the aircraft at 025 which was Aircraft Y.  After I got traffic in sight I then climbed Aircraft X. I asked HHR why they didn't stop Aircraft X and they said 'We called traffic and the they looked fine because one was VFR.'  If I didn't stop Aircraft X at 020 there would have been a near mid air in my opinion.HHR Tower to be reminded that they have to solve all potential conflicts prior to shipping an aircraft.
SCT TRACON Controller reports of a conflict that he resolves with an IFR departure that he is talking to and a VFR arrival that is talking to the departure's Tower.