SAN DIEGO -- Lifeguards Tuesday prepared for waves up to 18 feet that are expected to arrive Wednesday. "We've increased our staff a little in anticipation of the high surf and we're doing a bit of predeployment in the rescue-prone areas," said San Diego Lifeguard Lt. Greg Buchanan. Eight lifeguards will be on duty at daybreak Wednesday, and a special unit will be in place at Sunset Cliffs, he said.