Northwater performed storm-event water quality sampling and analysis at the Buzzi Unicem facility located in Oglesby, Illinois. The sampling was performed to achieve IEPA permit compliance requirements for grab and flow-weighted conditions. Sampling required specialized equipment due to the complexity and access issues related to outlet structures. A precipitation-monitoring program was also executed to collect samples that achieved the IEPA requirements. The project required the ability to mobilize resources under strict time constraints and deliver services in challenging conditions. All work was completed on time and followed strict sampling and reporting guidelines.