Not relevant to this project. Impacts From the above activities, we learned that the samples do not show a clear cut relationship between CFC-determined age and dissolved reactive phosphorus, thereby thwarting the intended analysis for increasing phosphorus discharge from agricultural sources in groundwater discharge into surface waters. Data will continue to be processed for evidence of phosphorus control by non-age factors, such as Fe, DOC, Ca, and hardness.
Publications No publications reported this period. Between January 1, and December 31, , attempts to locate viable sampling sites continued. Sampling sites in southwestern Wisconsin, southeastern Wisconsin, and central Wisconsin were located through various techniques. Customized sampling equipment was designed, created and tested prior to field sampling.
Samples were taken for both gas and nutrient analysis and physical parameters were characterized. Sample analysis is ongoing. Juliane Bowling assisted with sample site determination, sampling protocol, sample analysis, and report preparation. Chris Johnson assisted with sample site determination, sampling protocol, sample collection and sample analysis. Sue Larson assisted with sample collection and sample analysis. Shane Wiercinski assisted with sample collection and sample analysis.
This project has allowed for the training and development of three undergraduate students at UW-Stevens Point. All students learned the necessary techniques for installation of field equipment and sampling. The students learned about site determination and assisted with ground truth investigations.
Each student received in depth instrumentation training to analyze nutrient and gas samples. The students learned how to effectively interact with property owners, scientific professionals, and special interest groups. Nothing significant to report during this reporting period.
Sampling has been compromised over the project period due to intense flooding in the target areas during the early field season and drought conditions during the late field season. This may require reassessment of the sampling scheme.
Bryant Browne passed away in December Currently, the administration of the UW - Stevens Point is reviewing the status of his active projects. Designation of a replacement manager for his responsibilities has not yet been determined; however, this should be accomplished in the upcoming weeks. At that time, the agency will be contacted with a request on how to proceed. The other investigators, along with the director of Brown's analytical lab, are prepared to proceed toward the orderly completion of the project.
Impacts Creation of the new equipment allowed sampling to occur at previously unobtainable locations. Numerous sampling trips were made during the field season. Samples collected are still being analyzed. No conclusions have been made. Between July 1, and December 31, , numerous attempts were made to located viable sampling sites.
Sites were initially determined by analyzing various maps and ortho-photos. Contact with state employees, researchers, and landowners familiar with the target locations was initiated. The preliminary inquiries led to onsite investigations in Southern Wisconsin. Where possible, long-term sampling infrastructure was installed and preliminary samples were obtained. In areas where bedrock and soil structure limited the installation of traditional infrastructure, new sampling equipment was created and preliminary samples were obtained.
Phillip Barak has assisted with report compilation. Bryant Browne has assisted with sample site determination and sampling protocol. George Kraft has assisted with sample site determination. This project has allowed for the training and development of two undergraduate students. One student learned the necessary techniques for installation of field equipment and sampling.
The student also learned about site determination and assisted with ground truth investigations. The second student has been responsible for modifying the analytical procedure used for chlorofluorocarbon age-dating. This has required the student to research methodology and contact professionals from NOAA to further clarify a standard operating procedure. The data will be of interest to water quality managers and researchers addressing agricultural P management.
The quality and safety of water from domestic wells are not regulated by the Federal Safe Drinking Water Act or, in most cases, by state laws. Instead, individual homeowners are responsible for maintaining their domestic well systems and for monitoring water Many people might be surprised to learn that drinking-water sources, especially groundwater, can contain radioactive elements radionuclides.
Radionuclides in water can be a concern for human health because several are toxic or carcinogenic. Other radionuclides are useful tools for determining the age of groundwater in an aquifer or of sediment deposited at the bottom of a water body. Learn about groundwater quality in the Principal Aquifers of nine regions across the United States in informative circulars filled with figures, photos, and water-quality information. Unless we drill a well, how can we know the quality of the groundwater below?
Learn about how the USGS is using sophisticated techniques to predict groundwater quality and view national maps of groundwater quality. More than million people in the United States—about 35 percent of the population—receive their drinking water from public-supply wells. These systems can be vulnerable to contamination from naturally occurring constituents, such as radon, uranium and arsenic, and from commonly used manmade chemicals, such as fertilizers, pesticides, solvents, and gasoline hydrocarbons.
Volatile organic compounds VOCs are chemicals that both vaporize into air and dissolve in water. Once released into groundwater, many VOCs are persistent and can migrate to drinking-water supply wells. Groundwater ages were estimated by calibration of tracers to lumped Temporal changes in methyl tert-butyl ether MtBE concentrations in groundwater were evaluated in the northeastern United States, an area of the nation with widespread low-level detections of MtBE based on a national survey of wells selected to represent ambient conditions.
MtBE use in the U. A partial exponential lumped parameter model PEM was derived to determine age distributions and nitrate trends in long-screened production wells. The PEM can simulate age distributions for wells screened over any finite interval of an aquifer that has an exponential distribution of age with depth. The PEM has 3 parameters — the ratio of Geological Survey is using multiple approaches to measure and explain trends in concentrations of nitrate in principal aquifers of the United States.
Near decadal sampling of selected well networks is providing information on where long-term changes in nitrate concentrations have Lumped parameter models are mathematical models of transport based on simplified aquifer geometry and flow configurations that account for effects of This report documents selected age data interpreted from measured concentrations of environmental tracers in groundwater from 1, National Water-Quality Assessment NAWQA Program groundwater sites across the United States.
An overview is presented of existing groundwater-age data and their implications for assessing rates and timescales of recharge in selected unconfined aquifer systems of the United States. Environmental tracers are used to estimate groundwater ages and travel times, but the strongly heterogeneous nature of many subsurface environments can cause mixing between waters of highly disparate ages, adding additional complexity to the age-estimation process.
Mixing may be exacerbated by the presence of wells because long open intervals or Pesticide and transformation product concentrations and frequencies in ground water from areas of similar crop and pesticide applications may vary substantially with differing lithologies. Pesticide analysis data for atrazine, metolachlor, alachlor, acetochlor, and cyanazine and their pesticide transformation products were collected at High radium Ra concentrations in potable portions of the Cambrian-Ordovician C-O aquifer system were investigated using water-quality data and environmental tracers 3H, 3Hetrit, SF6 , 14C and 4Herad of groundwater age from 80 public-supply wells PSWs.
You might learn a lot! Shale-gas production and groundwater quality Groundwater age indicates that it's too soon to fully assess effects of Marcellus Shale gas production on groundwater quality in the upland aquifer zone used for domestic supply. Try the Tools Within the same aquifer, groundwater that is shallow and near the recharge area is younger than groundwater that is deep or that has moved far from the area where recharge occurs.
Use the GAMCTT tool to explore how basic aquifer properties and well configurations affect groundwater age mixtures in groundwater discharge and on contaminant trends from nonpoint-source contaminant input scenarios. Use DGMETA to compute recharge conditions from dissolved gases and environmental tracer concentrations commonly used for determining groundwater ages and reaction rates.
This tool will be released in Year Select Year
tion in ground water over time make pesticides only qualita-tively useful for age dating. CFC’s have been used to measure ground-water age because this method gives more accurate estimates of age (plus or minus 2 years) and can resolve better the dates of recharge of younger ground water (early ’s), which is needed to study. 4 Zhiwei Han, Changyuan Tang, Jingqiu Piao, Xing Li, Yingjie Cao, Touma Matsumaru, Chipeng Zhang, Application of chlorofluorocarbons (CFCs) to estimate the groundwater age at a headwater wetland in Ichikawa City, Chiba Prefecture, Japan, Applied Water Science, , 4, 3, CrossRef. These age-dating tracers can help water-resource managers to develop management strategies for shallow groundwater systems that contain mostly young groundwater. Old groundwater is defined as water that entered the aquifer before and more commonly refers to water older than 1, years.
The age of groundwater is defined as the time that has elapsed since the water first entered the gearquality.me example, some of the rain that falls on an area percolates (trickles) down through soil and rock until it reaches the water gearquality.me this water reaches the water table, it moves though the aquifer. 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. Information about the age of ground water can be used to define . The development of the CFC technique as a tool for dating groundwater has occurred over approximately the last 20 years and a number of research publications have documented its use in specific aquifers.
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The development of the CFC technique as a tool for dating groundwater has occurred over approximately the last 20 years and a number of research publications have documented its use in specific aquifers. 4 Zhiwei Han, Changyuan Tang, Jingqiu Piao, Xing Li, Yingjie Cao, Touma Matsumaru, Chipeng Zhang, Application of chlorofluorocarbons (CFCs) to estimate the groundwater age at a headwater wetland in Ichikawa City, Chiba Prefecture, Japan, Applied Water Science, , 4, 3, CrossRef. A new way of thinking about groundwater age is changing the field of groundwater age dating. Following a rigorous definition of age, a groundwater sample is seen not as water that recharged the flow regime at a point in the past, but as a mixture of waters that have Cited by:
The age of groundwater is defined as the time that has elapsed since the water first entered the gearquality.me example, some of the rain that falls on an area percolates (trickles) down through soil and rock until it reaches the water gearquality.me this water reaches the water table, it moves though the aquifer. tion in ground water over time make pesticides only qualita-tively useful for age dating. CFC’s have been used to measure ground-water age because this method gives more accurate estimates of age (plus or minus 2 years) and can resolve better the dates of recharge of younger ground water (early ’s), which is needed to study. The development of the CFC technique as a tool for dating groundwater has occurred over approximately the last 20 years and a number of research publications have documented its use in specific aquifers.Plus...