Fire officials don't expect to have the growing Ralston Fire in Foresthill contained for another week, and that means more smoky air for Nevada County residents.The 4,464-acre wildfire east of Foresthill in the Tahoe and Eldorado National Forests was 11-percent contained Sunday and is not slated for complete containment until Sept. 18, according to a news release Sunday from Tahoe National Forest Public Affairs Officer Anne Westling.Voluntary evacuations for the communities of Michigan Hill and Baker Ranch were lifted at 5 p.m. Saturday, while the firefighting strategy in the days ahead will focus on keeping the fire on Ralston Ridge …