Chris Reich; Don Hickey; Ann Tihansky
The objective of this research was to determine the rate, direction of flow, and contamination levels of saline groundwater in the Florida Keys and Florida Bay. Contamination studies are necessary to determine if nutrient and other contaminant levels are rising and to provide a baseline of data for future decision making.
Reese, R. S.; Reich, C. D.
Vacher, H. L.; Shinn, E. A.
Rose, J. B.; Brown, J.; Shinn, E. A.; Miller, S.; Farrah, S. R.
Rose, J. B.; Jiang, S.; Kellogg, C.; Shinn, E. A.
Tihansky, A. B.
A second injection of the dyes in the bayside well cluster was done on Feb. 19, 1997 and included SF6.
1. Perform a tracer experiment in existing well clusters. 2. Sample all wells biannually for nutrient and other contaminants. 3. Drill additional wells if needed (four wells were recently installed to create a transect across Key Largo). 4. Conduct additional tests to evaluate existing seepage meter designs quantitatively (initial quantitative test prove artificial pumping in the presence of waves). 5. Develop and install new "flexible" seepage meters as mandated by project review (provided further testing proves their reliability). 6. Determine seepage volume using new seepage meter design. 7. Integrate new seepage and water-level data (from transducers) and attempt a simple cross-keys groundwater-flow and tidal-pumping model. 8. Begin synthesis of results 9. Begin evaluation of new radium isotope method for determining groundwater seepage and mixing.
Field work to be undertaken in FY 1999 included:
1. a dye-tracer study using the newly completed transect of wells across Key Largo.
2. Collaboration with EPA-funded projects and University of South Florida on-site sewage disposal-well tracer studies.
3. Twice-yearly sampling and chemical analyses of ground waters collected from existing wells.
4. Drilling additional wells if needed.
5. Analysis for four isotopes of radium, for determining groundwater seepage and mixing.
The Nutrient Results of Ground and Surface Water at the Bayside Well Cluster study site contains the nutrient results from the collection of both ground and surface water samples. Nutrient concentrations are available for both the deep well (40 ft) and the shallow well (20 ft) in milligrams per liter and micromolar.
The Groundwater Flow Rates at the Bayside Well Cluster study site contains the results of the injection of two fluorescent dyes injected in the center wells in the well cluster on the bayside of Key Largo.
The Groundwater Flow Rates at the Oceanside Well Cluster study site contains the results of the injection of two fluorescent dyes injected in the center wells in the well cluster on the oceanside of Key Largo
U.S. Department of the Interior, U.S. Geological Survey
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