What makes CDI unique? CDI is a certified Woman Business Enterprise that focuses on building stronger communities across each of our marketplaces. To reflect this commitment, all full-time team members receive eight hours of volunteer time off per year. Our six service lines (Infrastructure + Analytics, Site, Structures, Survey, Transportation, and Water Resources) collaborate to leverage each other’s knowledge and expertise, implementing quality control measures, enabling unique solutions, and ultimately ensuring optimal project outcomes for our clients. With over 29 years in business, CDI has grown to six office locations in Collinsville, IL, Effingham, IL, Jefferson City, MO, Loui