The vital signs for Manteca District Ambulance are still going strong as the non-profit turns 60.• Rates 15 percent lower than nearby private sector ambulance companies.• The ambulance district has no debt.• Average 9-1-1 response times that in 94 percent of the time meet or beat the state benchmark of 90 percent for ambulance services. • State-of-the-art patient care equipment.• A financial commitment to youth activities in the communities they serve.The MDA is celebrating 60 years of service to Manteca, Lathrop and the surrounding countryside on Tuesday with an invitation-only reception at Chez Shari.And there is more that sets MDA apart from other ambulance operations. It is one of less than a half dozen non-profit ambulance companies still left in California. And thanks to its fiscal management as well as its non-profit status, MDA works with people who can’t afford to pay their full bills instead of turning them over to collection agencies or placing liens against their homes.Manteca Ambulance Chief Operating Officer Bill Caldera noted that is a point of pride for his bosses on the MDA board that serve without compensation.