Upgrades begin across Merced fire stations with 24-hour paramedicsFirst responders say about 70 percent of calls handled by the Merced Fire Department involve medical emergencies. First responders say about 70 percent of calls handled by the Merced Fire Department involve medical emergencies. First responders say about 70 percent of calls handled by the Merced Fire Department involve medical emergencies. First responders say about 70 percent of calls handled by the Merced Fire Department involve medical emergencies. First responders say about 70 percent of calls handled by the Merced Fire Department involve medical emergencies.