Families of students at a Richmond high school are waiting to hear about soil quality. The school is preparing to start classes soon. A potentially harmful substance was found on the campus, prompting tests.

The school district has made backup plans in case the campus is not safe for students. These plans are being looked at while people wait for the test results. More information is available from NBC Bay Area, including a video report.

The situation is being closely watched as the start of school approaches.