Also know that Grass Valley dispatches for a wide area and uses more than one repeater - so you may not hear all traffic from G.V.. I'm in west Reno and hear Grass Valley use about 3 repeater sites. I'm sure G.V. uses many more sites.
Since you're down on the lake you might want to plug in El Dorado, Douglas, and Carson City counties - and South Lake Tahoe and U.S. Forestry.