Piedmont Unified elementary schools begin a return to the classroom with hybrid learning By Sharon Song KTVU's Rob Roth reports. PIEDMONT, Calif. - For the first time in almost a year, in-class instruction was held in some classrooms in the Piedmont Unified School District (PUSD) on Tuesday, making it the first big school district in Alameda County to have students back in the classroom. The district began hybrid instruction, starting with Kindergarteners at Beach, Wildwood, and Frank C. Havens elementary schools. The return to classrooms will be rolled out in a staggered model, with first graders coming back on Wednesday and second graders to attend class on Thursday.