By Lila Seidman From Los Angeles Times Los Angeles—A spot fire that took hold on the eastern edge of the Caldor fire has pushed the growing blaze closer to South Lake Tahoe, belching smoke that has caused record-breaking air pollution and spurring anxiety the fire could reach resort communities. The spot fire had jumped to around 100 acres and was “growing at a fairly rapid pace,” said Eric Schwab, an operations section chief with the California Department of Forestry and Fire Protection. The new growth had not yet triggered any evacuation warnings or orders for the Lake Tahoe area, but nearly 30,000 people have already fled the fire as it has chewed its way through El Dorado County. And due to the blaze, U.S. Forest Service officials recently ordered the closure of several backcountry areas near the lake, including Desolation Wilderness, Meiss Country, Barker Pass, and McKinney/Rubicon. Still, some on …