The OUC is made up of 29 members whose mission is to make sure that any future construction, renovation, or remodeling project does not interfere with any existing infrastructure under the surface of the City of Chicago. Members include offices from private communication companies such as AT&T and Abovenet. Also, the OUC includes members from the Department of Streets and Sanitation, the Department of Forestry as well as multiple members front the Chicago Department of Transportation (CDOT), the Chicago Transit Authority (CTA), and the Chicago Department of Water Management.