Federal emergency relief officials have provided new details on their decision to reject California’s request to reimburse the state for work to rebuild and reinforce the badly damaged spillways at Oroville Dam. The Federal Emergency Management Agency announced earlier this month that it would not reimburse the state for $306 million in construction on the spillways, which failed in February 2017 and prompted mandatory evacuation orders for 188,000 people living downstream of the nation’s tallest dam.