Western Wildfire Yosemite

Jae C. Hong/AP

A helicopter reloads fire retardant as firefighters continue to battle the Rim Fire in Tuolumne City, Calif., on Monday, Aug. 26, 2013. A raging wildfire in Yosemite National Park rained ash on the reservoir that is the chief source of San Francisco's famously pure drinking water, and utility officials Monday scrambled to send more water toward the metropolitan area before it becomes tainted. (AP Photo/ Jae C. Hong)

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