About half the teachers return to school as students resume classes in West Contra Costa Unified Only half of teachers return in West Contra Costa school district Some students in the West Contra Costa Unified School District returned to classrooms on Monday: Some students will be back for just a couple of hours a day, twice a week and many of them will not see their teachers in person. Allie Rasmus reports RICHMOND, Calif. - Some students in the West Contra Costa Unified School District returned to classrooms on Monday: Some students will be back for just a couple of hours a day, twice a week and many of them will not see their teachers in person.