Nct TRACON controller reported a VFR aircraft in hwd airspace flew under the oak runway 30 final app...

Narrative:

Aircraft X was on a visual approach to oak runway 30 with aircraft Y following on the visual approach. A VFR 1200 code aircraft departed hwd southeast bound and was climbing. I issued traffic to aircraft X on the 1200 code as it appeared to climb out of 1100 feet. The 1200 code aircraft climbed to 1400 feet. Aircraft X passed over the aircraft at 2500 feet on a seven mile final. I then switched aircraft X to oak tower. He eventually went around. I issued traffic to aircraft Y on the 1200 code aircraft. When aircraft Y did not have the aircraft in sight I instructed him to stop his descent as the aircraft passed underneath. Once aircraft Y passed I cleared him for the visual.the 1200 code aircraft was on a path directly underneath the oak runway 30 final and opposite direction. The aircraft was inside hwd delta airspace the entire time. This leads me to believe that the aircraft is in communication with the tower at this point. Our LOA with hwd tower states that oak runway 30 aircraft may penetrate the class delta airspace without coordination provided they are within 1.5 nm of the centerline. We have been told by controllers and flms at hwd tower that they are under direct order not to issue turns to aircraft. If this is the case it contradicts the 7110.65 and has caused numerous cases like this and is causing unsafe situations that will ultimately lead to a midair collision.management and [union reps] from both facilities need to get together and collaborate on a way to mitigate this unsafe practice.

Original NASA ASRS Text

Title: NCT TRACON Controller reported a VFR aircraft in HWD airspace flew under the OAK Runway 30 final approach course causing two conflicts with OAK arrivals. The final approach course goes through HWD Delta airspace.

Narrative: Aircraft X was on a visual approach to OAK RWY 30 with Aircraft Y following on the visual approach. A VFR 1200 code aircraft departed HWD southeast bound and was climbing. I issued traffic to Aircraft X on the 1200 code as it appeared to climb out of 1100 feet. The 1200 code aircraft climbed to 1400 feet. Aircraft X passed over the aircraft at 2500 feet on a seven mile final. I then switched Aircraft X to OAK Tower. He eventually went around. I issued traffic to Aircraft Y on the 1200 code aircraft. When Aircraft Y did not have the aircraft in sight I instructed him to stop his descent as the aircraft passed underneath. Once Aircraft Y passed I cleared him for the visual.The 1200 code aircraft was on a path directly underneath the OAK RWY 30 final and opposite direction. The aircraft was inside HWD delta airspace the entire time. This leads me to believe that the aircraft is in communication with the tower at this point. Our LOA with HWD Tower states that OAK RWY 30 aircraft may penetrate the class delta airspace without coordination provided they are within 1.5 nm of the centerline. We have been told by controllers and FLMs at HWD Tower that they are under direct order not to issue turns to aircraft. If this is the case it contradicts the 7110.65 and has caused numerous cases like this and is causing unsafe situations that will ultimately lead to a midair collision.Management and [union reps] from both facilities need to get together and collaborate on a way to mitigate this unsafe practice.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1465276
Time
Date	201707
Local Time Of Day	0601-1200
Place
Locale Reference	NCT.TRACON
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Nct TRACON controller reported a VFR aircraft in hwd airspace flew under the oak runway 30 final approach course causing two conflicts with oak arrivals. The final approach course goes through hwd delta airspace.