[EBB Sightings] Hayward Shoreline

My wife and I went for a quick afternoon walk on the Hayward  
Shoreline today.  Not much to report--a few Ruby-crowned Kinglets, a  
Warbling Vireo, bunches of sparrows, and plenty of shorebirds.  She  
headed back to the car, and I continued on to Frank's Dump.  Frank's  
had a set of Avocets and a set of Stilts, but nothing else.  My wife  
however, spotted on the hill above the parking lot, a kite sized  
raptor being harassed by a bunch of crows.  As described, it had a  
striped belly, a white upper breast and throat, and black splotchies  
on each side of the face.  Sounds like a Peregrine Falcon to me, and  
after looking at Sibley's and Stokes' guides, she believes it best  
matches what she saw.  Has anyone else seen a Peregrine at the  
Hayward Shoreline?