"It happened last year, at the same time," he said.
The graffiti included anti-gay messages and named the mascot of a rival local high school.
Administrators at that school have been contacted, Bryan said, as well as the Newport Beach Police Department.
Bryan said he hoped that someone would end up bragging about the damage, and that eventually someone would come forward with information.
"Someone's going to know who did it," he said.
Members of the PTA and school administrators discussed whether adding cameras would prevent future incidents, as well as whether walls could be covered with special materials making it easier to clean graffiti.
The main question, said Bryan, is "how fast can we make this go away."
The company that painted the mural included the cost of repainting the mural in case of vandalism, he added.
"We used it last year," he said.
For now, the damage is mostly covered with tarps.
Committee tackles sharrows, speed signs and more
Members of the Newport Beach Citizens Bicycle Safety Committee met Monday afternoon, spending more than an hour discussing whether bicycles should have speed limits on steep hills, how to explain Coast Highway sharrows to Corona del Mar residents and the possibility of creating a bicycle advisory group to work with county Caltrans officials on safety issues.
Committee members, city staff and cycling advocate guests bounced around ideas about whether fixed-speed radar signs on hills like Ridge Park and Spyglass would be effective in reducing accidents — or whether cyclists might try to race against the signs.
Barbara Danzi, a Newport Coast resident and committee member, said she would prefer to see signs at neighborhood exits on those hills that warn motorists to be careful of cyclists — not signs warning cyclists to be more careful.
Staff will continue to explore fixed radar signs, as well as possibly add signs aimed at cyclists that say "Watch Downhill Speed."