Five streams located in Delaware County, Pennsylvania are monitored to evaluate the effectiveness of stormwater controls. The redevelopment of the former Granite Run Mall site includes the installation of new stormwater controls. The headwaters of the Chrome Run was impacted by uncontrolled stormwater runoff from the site. The Chrome Run being monitored to determine if stream deterioration can be reversed by the implementation of the new SCM. Dicks Run, Dismal Run and Rocky Run will be unaffected by the redevelopment and are monitored as controls. This project is performed in conjunction with the University of Baltimore.