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The Crawford Hydrology Laboratory (CHL) is a nationally leading laboratory for groundwater flow investigations with an emphasis on, but not limited to, karst landscape/aquifer systems. Founded as the Center for Cave and Karst Studies in 1979, we have long been an industry leader in groundwater investigations specializing in the development and use of fluorescent dye tracing methods. We provide a range of technical, field, and laboratory services in addition to quality supplies, state-of-the-art analytical services, and professional consultation. We have extensive experience assisting clients with a variety of fluorescent dye tracing applications including groundwater basin delineation, landfill expansion/leachate containment, sewage leaks, dam safety and remediation, contamination source determination, underground storage tank leaks, and spring protection. CHL serves a diverse, national and international clientele, including federal, state, and local agencies, environmental consulting firms, and individuals. Past clients include the National Park Service, Bureau of Land Management, U.S. Forest Service, Army Corps of Engineers, and Water Resources Authority of Jamaica. In recent years we have provided services to clients throughout the US plus Brazil, Canada, Italy, Jamaica, Mexico, New Zealand, and Peru. Please visit our website www.dyetracing.com for additional details on services and opportunities available through Crawford Hydrology Lab.