When the deadly Woolsey Fire broke out at the Santa Susana Field Lab site last month, state officials assured residents that no high-level toxins or radiation were present at the site, known for decades of nuclear and rocket-engine testing in the hills above the San Fernando and Simi valleys. But those statements have been met with skepticism by residents and activists. Now, they are rolling out their own study that will look into potential contamination from the site during the fire.