Separate wildfires in California and Washington threatened residential areas on Tuesday, prompting a public-health advisory in the San Francisco Bay Area and mandatory evacuations on Washington’s Olympic Peninsula. In Antioch, about 45 miles east of San Francisco, the Contra Costa County Fire Protection District contained the perimeter of the so-called Willow Fire at 6:06 p.m. after it burned roughly 10 acres of vegetation near Oakley Road and Willow Avenue by a BART maintenance yard. While no structures were lost and evacuations were not ordered, county health officials warned residents in Oakley, Brentwood, Byron and Discovery Bay to stay indoors and close windows because of smoke. Hundreds of miles north, a separate blaze dubbed the Belgian Fire ignited around 2 p.m. near Belgian Drive outside Brinnon, Washington, after a structure fire spread to brush and heavy timber. The fire had charred an estimated 10 acres by early evening and continued to grow, triggering Level 3 “Go Now” evacuation orders for roughly 35 homes on Belgian Drive, Rock Brook Road and adjacent streets. Washington State Patrol Chief John Batiste authorized state firefighting resources to assist local crews as they worked to protect at least four threatened structures and restore power that was cut along Dosewallips Road.