المؤلفون: LaFreniere, L. M., Division, Environmental Science

المساهمون: United States. Department of Agriculture.

مصطلحات موضوعية: Management, Distribution, Cones, Penetrometers, Evaporation, Water, Organic Compounds, Wetlands, Lakes, Storage, Drinking Water, Nebraska, Irrigation, Contamination, 54 Environmental Sciences, Carbon Tetrachloride, Configuration, Plumes, Agriculture, Sampling, Aquifers

الوصف: In 1992-1993, Argonne National Laboratory investigated potential carbon tetrachloride contamination that might be linked to the former grain storage facility operated by the Commodity Credit Corporation (CCC) of the U.S. Department of Agriculture (USDA) at Utica, Nebraska. These initial studies identified carbon tetrachloride in a plume of contaminated groundwater, extending approximately 3,500 ft southeastward from the former CCC/USDA facility, within a shallow upper aquifer that had been used previously as a municipal water source by the town (Figure 1.1). A deeper aquifer used as the current municipal water source was found to be free of carbon tetrachloride contamination. Although the shallow aquifer was no longer being used as a source of drinking water at Utica, additional studies indicated that the carbon tetrachloride could pose an unacceptable health threat to potential future residents who might install private wells along the expected downgradient migration pathway of the plume. On the basis of these findings, corrective action was recommended to decrease the carbon tetrachloride concentrations in the upper aquifer to acceptable levels (Argonne 1993a,b, 1995). Initial discussions with the Utica village board indicated that any restoration strategies involving nonbeneficial discharge of treated groundwater in the immediate vicinity of Utica would be unacceptable to the town. To address this concern, the CCC/USDA and Argonne, in cooperation with multiple federal and state regulatory and environmental agencies (Table 1.1) proposed a treatment strategy for the Utica groundwater employing groundwater extraction coupled with the seasonal use of agricultural spray irrigation equipment to simultaneously (1) remove carbon tetrachloride from the groundwater (by volatilization to the atmosphere) and (2) discharge the treated groundwater to enhance the development of wetlands in the North Lake Basin Wildlife Management Area, just north of the town (Argonne 2000). To develop this treatment approach, additional ...

وصف الملف: Text

العلاقة: rep-no: ANL/EVS/AGEM/TR-09-10; grantno: DE-AC02-06CH11357; osti: 982346; https://digital.library.unt.edu/ark:/67531/metadc1014495Test/; ark: ark:/67531/metadc1014495

الإتاحة: https://doi.org/10.2172/982346Test
https://digital.library.unt.edu/ark:/67531/metadc1014495Test/

المؤلفون: LaFreniere, L. M.

المساهمون: United States. Department of Agriculture.

مصطلحات موضوعية: Surface Waters, Sediments, Remedial Action, Monitoring, Cones, Penetrometers, Geology, Boreholes, Organic Compounds, Hydraulics, Sampling, Inclination, Contamination, 54 Environmental Sciences, Carbon Tetrachloride, Implementation, Configuration, Plumes, Biodegradation, Ground Level, Aquifers

جغرافية الموضوع: United States - Kansas - Brown County - Everest

الوصف: On February 15, 2007, the Commodity Credit Corporation of the U.S. Department of Agriculture (CCC/USDA) submitted Recommendations for Remedial Action at Everest, Kansas. Those Recommendations were accepted by the Kansas Department of Health and Environment (KDHE) in a letter to the CCC/USDA dated March 5, 2007. The approved Recommendations document outlines a plan for systematic groundwater sampling and monitoring at Everest to provide data necessary for the critical evaluation of remedial options - including a phytoremediation alternative - for restoration of the groundwater and protection of the surface waters of the intermittent creek at this site. Phase I of the KDHE-approved monitoring plan includes the following activities: (1) Groundwater sampling at existing monitoring wells, with analyses for volatile organic compounds (VOCs) and selected biodegradation parameters; (2) Sampling of surface waters along the intermittent creek for VOCs analyses; and (3) Periodic manual measurement and automated recording of groundwater and surface water levels in the vicinity of the intermittent creek. The locations selected for groundwater and surface water sampling and analyses under the approved monitoring program were determined in consultation with the KDHE. As a result of subsequent discussions among representatives of the KDHE, the CCC/USDA, and Argonne regarding the technical program at Everest, the CCC/USDA seeks KDHE approval for the installation of up to four new permanent monitoring wells along the upper reach of the intermittent creek west of the Nigh property, as shown in Figure 1. The proposed new well locations lie progressively downgradient in the anticipated direction of future groundwater and contaminant movement; all of the recommended points lie at least 2,000 ft upgradient, however, of the confirmed area of groundwater discharge to the creek identified near Highway 73. The proposed new wells will supplement the existing network of groundwater and surface water monitoring points identified in the ...

وصف الملف: Text

العلاقة: rep-no: ANL/EVS/AGEM/CHRON-1041; grantno: DE-AC02-06CH11357; osti: 1031445; https://digital.library.unt.edu/ark:/67531/metadc834981Test/; ark: ark:/67531/metadc834981

الإتاحة: https://doi.org/10.2172/1031445Test
https://digital.library.unt.edu/ark:/67531/metadc834981Test/

المؤلفون: LaFreniere, L. M.

المساهمون: United States. Department of Agriculture.

مصطلحات موضوعية: Pumping, Testing, Monitoring, Cones, Penetrometers, Recommendations, Hydraulics, Sampling, Anl, Construction, Cross Sections, 54 Environmental Sciences, Plumes, Agriculture, Aquifers

جغرافية الموضوع: United States - Kansas - Brown County - Everest

الوصف: On September 8-9, 2005, representatives of the Kansas Department of Health and Environment (KDHE), the Commodity Credit Corporation of the U.S. Department of Agriculture (CCC/USDA), and Argonne National Laboratory met at the KDHE's offices in Topeka to review the status of the CCC/USDA's environmental activities in Kansas. A key CCC/USDA goal for this meeting was to obtain KDHE input on the selection of possible remedial approaches to be examined as part of the Corrective Action Study (CAS) for this site. As a result of the September meeting, the KDHE recommended several additional activities for the Everest site, to further assist in selecting and evaluating remedial alternatives for the CAS. The requested actions included the following: (1) Construction of several additional interpretive cross sections to improve the depiction of the hydrogeologic characteristics affecting groundwater and contaminant movement along the apparent main plume migration pathway to the north-northwest of the former CCC/USDA facility, and in the vicinity of the Nigh property. (2) Identification of potential locations for several additional monitoring wells, to better constrain the apparent western and northwestern margins of the existing groundwater plume. (3) Development of technical recommendations for a stepwise pumping study of the Everest aquifer unit in the area near and to the north of the Nigh property. On October 21, 2005, Argonne issued a brief Cross Section Analysis (Argonne 2006a) addressing these concerns, on behalf of the CCC/USDA. This report includes the following: (1) Preliminary recommendations for the siting of three new monitoring wells, at locations identified by the KDHE. Argonne also suggested, however, that the installation and sampling of these wells be deferred until after completion of the CAS evaluation. (2) A proposed strategy for testing of the Everest aquifer unit near the Nigh property, involving initial test pumping of the former Nigh domestic well and subsequent testing of a new well to be installed ...

وصف الملف: Text

العلاقة: rep-no: ANL/EVS/AGEM/TR-06-01; grantno: DE-AC02-06CH11357; osti: 925317; https://digital.library.unt.edu/ark:/67531/metadc896728Test/; ark: ark:/67531/metadc896728

الإتاحة: https://doi.org/10.2172/925317Test
https://digital.library.unt.edu/ark:/67531/metadc896728Test/

المؤلفون: Benson, S. J., Ye, Y., Science, Mathematics and Computer

المساهمون: United States. Department of Energy. Office of Science.

مصطلحات موضوعية: Programming, Cones, 99 General And Miscellaneous//Mathematics, Computing, And Information Science, Linear Programming, Efficiency, Algorithms, Distribution, Performance, Convergence

الوصف: DSDP implements the dual-scaling algorithm for semidefinite programming. The source code of this interior-point solver, written entirely in ANSI C, is freely available. The solver can be used as a subroutine library, as a function within the Matlab environment, or as an executable that reads and writes to files. Initiated in 1997, DSDP has developed into an efficient and robust general-purpose solver for semidefinite programming. Although the solver is written with semidefinite programming in mind, it can also be used for linear programming and other constraint cones. The features of DSDP include the following: a robust algorithm with a convergence proof and polynomially bounded complexity under mild assumptions on the data, primal and dual solutions, feasible solutions when they exist or approximate certificates of infeasibility, initial points that can be feasible or infeasible, relatively low memory requirements for an interior-point method, sparse and low-rank data structures, extensibility that allows applications to customize the solver and improve its performance, a subroutine library that enables it to be linked to larger applications, scalable performance for large problems on parallel architectures, and a well-documented interface and examples of its use. The package has been used in many applications and tested for efficiency, robustness, and ease of use. We welcome and encourage further use under the terms of the license included in the distribution.

وصف الملف: Text

العلاقة: rep-no: ANL/MCS-TM-277; grantno: DE-AC02-06CH11357; osti: 947970; http://digital.library.unt.edu/ark:/67531/metadc902461Test/; ark: ark:/67531/metadc902461

الإتاحة: https://doi.org/10.2172/947970Test
http://digital.library.unt.edu/ark:/67531/metadc902461Test/

المؤلفون: Dejus, R.

المساهمون: United States. Department of Energy.

المصدر: Other Information: PBD: 9 Mar 2004

مصطلحات موضوعية: Spectra, Magnetic Fields, Cones, Storage Rings, 43 Particle Accelerators, Flux Density, Sensitivity, Simulation, Electron Beams, Design, Harmonics, Specifications, Beam Emittance, Tuning, Wiggler Magnets, Tolerance

الوصف: There is a trade-off between how much effort should go into the tuning of insertion devices to reduce their rms phase errors and the actual benefits achieved in spectral quality when the real APS beam emittance and beam energy spread are taken into account. In the magnetic measurement laboratory, the measured magnetic fields are analyzed in terms of the rms phase error and the angular flux density, which is calculated from the measured fields for an ideal electron beam, i.e., a zero-emittance beam. In this study, we go beyond the case of an ideal beam to study the effect of the APS beam emittance and beam energy spread on the angular flux density and the pinhole flux (for a typical pinhole size that covers most of the central cone of the radiation) for real-field insertion devices to get an estimate of how low an rms phase error is reasonable to attain. The results presented here are directly applicable to the APS ''canted'' undulators of type A (planar permanent-magnet hybrid insertion devices 2.1 m long and 3.3 cm period length) but also to the standard undulators A (which have a similar design with the same period length but are 0.3 m longer) unless otherwise noted, e.g., the asymptotic ratios of the real-to-ideal intensity at very high harmonic numbers differ. To obtain the sensitivity to the rms phase error on the spectra, two devices were studied--one that exemplifies a device with smaller than average rms phase error (3.7{sup o} at 10.5 mm gap; henceforth labeled the ''low-phase-error device'') and one that represents a device with larger than average rms phase error (6.8{sup o} at 10.5 mm gap; henceforth labeled the ''high-phase-error device''). It should be noted that, although this device has a relative large rms phase error, it is by no means performing poorly and is well within the APS tolerance specification (of 8{sup o} rms phase error at 11.5 mm gap). The spectra were calculated up to 100 keV to study degradation of very high harmonics due to magnetic field errors, an important consideration for ...

وصف الملف: 13 pages; Text

العلاقة: rep-no: ANL/APS/LS-304; grantno: W-31-109-ENG-38; osti: 822558; http://digital.library.unt.edu/ark:/67531/metadc781145Test/; ark: ark:/67531/metadc781145

الإتاحة: https://doi.org/10.2172/822558Test
http://digital.library.unt.edu/ark:/67531/metadc781145Test/