Two years ago, the northern Imperial County town of Niland lost its only post office in a fire. It was supposed to be a temporary closure. But residents are still fighting to get it back.Reporter: Kori Suzuki, KPBSCalifornia prison officials say it will cost billions of dollars to enforce new indoor heat regulations that the state’s proposed for workers. But they have declined to share exact cost estimates.Reporter: Jeanne Kuang, CalMatters Learn more about your ad choices. Visit megaphone.fm/adchoices