A year ago, prompt CPR by his father and his girlfriend saved Ricky Ewald’s life. But their actions stand to potentially save the lives of many others in Nevada County, after the incident kick-started an effort by Nevada County Consolidated firefighters to raise money for community classes, set to kick off March 23. Ewald, then a 22-year-old, collapsed March 17, 2012, when he went into sudden cardiac arrest. But because both Rick Ewald and Vanessa Hart recently had taken CPR classes, they were able to keep Ricky alive during the crucial minutes until paramedics arrived. Afterward, the family made it …