This document is also available in format: fs Information about the age of ground water can be used to define recharge rates, refine hydrologic models of ground-water systems, predict contamination potential, and estimate the time needed to flush contaminants from ground-water systems. CFCs also can be used to trace seepage from rivers into ground-water systems, provide diagnostic tools for detection and early warning of leakage from landfills and septic tanks, and to assess susceptibility of water-supply wells to contamination from near-surface sources. During the past 50 years, human activities have released an array of chemical and isotopic substances to the atmosphere. In the atmosphere, these substances have mixed and spread worldwide. Young ground water is typically found at depths from 0 to feet in unconsolidated sediments and at depths up to feet in fractured-rock systems.
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Tritium half-life Although it is difficult to evaluate age information from tritium data alone, age commonly can be reliably determined from data on tritium 3 H and its decay product, helium-3 3 He. Several conditions are necessary to solve the calculation and interpret the age: 1 The sample must contain detectable 3 H greater than approximately 0.
Krypton 85 Kr has also been used to date ground water. The source for atmospheric input of 85 Kr is reprocessing of fuel rods from nuclear reactors. Because of difficulties in collection and analysis, 85 Kr is not yet a practical dating tool for ground-water studies. CFCs and nitrate concentrations were measured between June and January on a section of the Delmarva Peninsula, in the Fairmount watershed.
Ground-water dating reveals a pattern of high nitrate concentrations moving slowly toward the estuary.
Alternatives to using CFCs in dating ground water will clearly be needed as atmospheric CFC concentrations continue to fall. Industrial production of SF 6 began in with the introduction of gas-filled high-voltage electrical switches. SF 6 is extremely stable and is accumulating rapidly in the atmosphere. The historical atmospheric mixing ratio of SF 6 is being reconstructed from production records, archived air samples, and atmospheric measurements, and retrieved from concentrations measured in seawater and in previously-dated ground water.
This document is also available in format: fs Tracing and Dating Young Ground Water. Data on concentrations of environmental tracers, such as chlorofluorocarbons (CFCs), tritium (3 H), and other chemical and isotopic substances in ground water, can be used to trace the flow of young water (water recharged within the past 50 years) and to determine the time elapsed since recharge. Dating Around: Season 1: Gurki - Arranged Marriage. Episodes Dating Around. Release year: In New Orleans, six new singles look for love - or something like it - on back-to-back blind dates. But who will each choose for a second date? Justin 26m. He's got smooth moves, swift jokes and a Number Of Seasons: 2. Feb 14, Created by Chris Culvenor. With Gurki Basra, Kate Burr, Graig Couton, Jonathan A. Hanna. In a series of flirtations and fails, six real-life singles navigate five blind dates. Their mission: Find one perfect match worthy of a second date/
A preliminary reconstruction has been made of northern-hemisphere SF 6 mixing ratios figure far left. Although SF 6 is almost entirely of human origin, there is likely a natural, igneous source of SF 6 that will complicate dating in some environments.
Additional comments and case studies. For best results, the apparent age should be determined using multiple dating techniques because each dating technique has limitations.
CFC dating is best suited for ground water in relatively rural environments where localized contamination, such as that from septic systems, sewage effluent, landfills, or urban runoff, can contain CFC concentrations in excess of that of atmospheric sources. Even where there are problems with CFC dating of ground water, the presence of CFCs indicates that the water sample contains at least some posts water, making CFCs useful as tracers of recent recharge.
Delmarva Peninsula Results from the determination of CFCs in some agricultural areas on the Delmarva Peninsula of Maryland and Virginia indicate that water recharged since the early s exceeds the U. Nitrate concentrations in ground water under woodlands were low, whereas ground water recharged under agricultural fields had nitrate concentrations that exceeded the MCL.
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Thus, even if the application of nitrogen fertilizers to the fields stopped today, streams, rivers, and estuaries can be expected to receive increasing amounts of nitrate from ground-water discharge until the contaminated water is flushed through the system Modica and others, ; up to 30 years may be needed to flush the high-nitrate water present in several small agricultural watersheds.
Central Oklahoma Water discharged from deep to feet municipal supply wells in the central Oklahoma aquifer contains CFCs Busenberg and Plummer, This unexpected finding indicated that shallow ground water was being mixed with deep, older water during pumping.
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In this case, CFCs were a valuable tracer for testing hydraulic seals of municipal water wells and their susceptibility to contamination.
River water downstream from outfalls of sewage treatment plants in central Oklahoma contained very high concentrations of CFCs, which were also found in shallow ground water in the alluvium and terrace system near rivers. This indicates that these waters passed rapidly through the unsaturated zone to the water table, rather than recharging by slow percolation. Temperatures derived from gas solubilities in ground water suggest that the aquifer is recharged locally.
CFCs were used to trace and date water in the karst aquifer near Valdosta, Georgia. Nevada Measurements of CFCs in unsaturated-zone air along the crest of Yucca Mountain, Nevada, a potential site for a high-level radioactive waste repository, show that the residence time of shallow advecting gas is less than 5 years Thorstenson and others,