San Diego Padres' Ha-Seong Kim throws a ball during San Diego Padres spring training baseball practice Saturday, Feb. 27, 2021, in Peoria, Ariz. (AP Photo/Charlie Riedel) Photo: Associated Press By TERRY TANG and MANUEL VALDES Associated Press SEATTLE (AP) — When Seattle’s largest health care system got a mandate from Washington state to create a mass COVID-19 vaccination site, organizers knew that gathering enough volunteers would be almost as crucial as the vaccine itself. “We could not do this without volunteers,” said Renee Rassilyer-Bomers, chief quality officer for Swedish Health Services and head of its vaccination site at Seattle University. “The sheer volume and number of folks that we wanted to be able to serve and bring in requires … 320 individuals each day.”