From Richmond Times Dispatch article:

Virginia Commonwealth University will test its emergency communication systems, including 10 sirens throughout the Monroe Park and MCV campuses, at noon Wednesday.

The test will include the sirens as well as text messages, digital signs, e-mails, classroom alert devices and website information.

The sirens will be audible beyond the boundaries of the two campuses and will sound an up-and-down wail for three minutes. After a one-minute pause, a steady wail will signal the end of the test.