USING NOVEL TRACERS FOR BETTER UNDERSTANDING OF GWUDI IN KARST SYSTEMS

The primary concern for groundwater under the direct influence (GWUDI) of surface water systems is the inherent risk associated with Giardia cysts and Cryptosporidium oocysts. Published research indicates that Cryptosporidium and Giardia can survive for months in some aquatic environments, are resistant to chlorination, and may cause infection in small numbers. Karst aquifers are generally expected to be the more susceptible to this type of contamination than granular aquifers, because of the rapid flow velocities and lower potential for filtration in these systems. However, even in karst aquifers, flow rates and recharge characteristics can vary greatly, so not all wells or springs in these settings may be considered as GWUDI. The purpose of this research is to develop and test alternative methods for assessing GWUDI in karst aquifers using advanced microbial (PCR-based molecular) and isotopic (Be-7) techniques. This presentation will summarize the current data and status of the project.