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Summary Tritium/helium-3 (3H/3He) and chlorofluorocarbons (CFCs) were investigated as environmental tracers in ground water from Jeju Island (Republic of Korea), a basaltic volcanic island. Ground-water mixing was evaluated by comparing 3H and CFC-12 concentrations with lumped-parameter dispersion models, which distinguished old water recharged before the 1950s with negligible 3H and CFC-12 from younger water. Low 3H levels in a considerable number of samples cannot be explained by the mixing models, and were interpreted as binary mixing of old and younger water; a process also identified in alkalinity and pH of ground water. The ground-water CFC-12 age is much older in water from wells completed in confined zones...
Categories: Publication;
Types: Citation;
Tags: Aquifer vulnerability,
Environmental tracers,
Ground
These layers represent the Public Land Survey System (PLSS) polygonal data that were joined to Rights-of-Way (ROW) tabular data queried from LR2000 on the highest resolution legal land description available. It contains the merged PLSS intersected feature class containing all aliquot parts for the LR2000 query dissolved on case serial numbers. LR2000 data without corresponding PLSS data will not yield geospatial data. Each of the four map layers represent 'AUTHORIZED', 'PENDING', 'CLOSED', & 'EXPIRED' case dispositions. The Not Matched Table show the unmatched records from the LR2000 to PLSS process described in the "ROW Data Processing Report". LR2000 data without corresponding legal land description PLSS data...
This community catalog serves the Oregon Water Science Center. Community public website: http://or.water.usgs.gov/. The Oregon Water Science Center provides reliable water data and interpretation of data to Federal, State, and local agencies, Tribes, and the public. Our data and study results are widely used to manage Oregon's water resources for the benefit of people and our environment.
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