Two different opinions offered for this one so posting to get other's opinions
2 smaller birds and 2 California Brown Pelican were flying away from shore. It might alternatively be a Sooty Shearwater.
This gull was flying over the partially sunken wreck of the SS Palo Alto, a concrete ship. These photos are cropped from photo 3.
Birds covered every inch of the ship. Other species present included Brandt's Cormorants and California Brown Pelicans.
2 smaller birds and 2 California Brown Pelican were flying away from shore. It's on the bottom middle in photo 4.
Leg bands: by:wp (left: blue over yellow; right white over purple)