2012 Groundwater Monitoring Report Central Nevada Test Area, Subsurface Corrective Action Unit 443

doi:10.2172/1110206

GSTDTAP > 地球科学

DOI	10.2172/1110206
报告编号	LMS/CNT--S09647
来源ID	OSTI ID: 1110206
	2012 Groundwater Monitoring Report Central Nevada Test Area, Subsurface Corrective Action Unit 443
	[null]
	2013-04-01
出版年	2013
页数	70
语种	英语
国家	美国
领域	地球科学
英文摘要	The Central Nevada Test Area was the site of a 0.2- to 1-megaton underground nuclear test in 1968. The surface of the site has been closed, but the subsurface is still in the corrective action process. The corrective action alternative selected for the site was monitoring with institutional controls. Annual sampling and hydraulic head monitoring are conducted as part of the subsurface corrective action strategy. The site is currently in the fourth year of the 5-year proof-of-concept period that is intended to validate the compliance boundary. Analytical results from the 2012 monitoring are consistent with those of previous years. Tritium remains at levels below the laboratory minimum detectable concentration in all wells in the monitoring network. Samples collected from reentry well UC-1-P-2SR, which is not in the monitoring network but was sampled as part of supplemental activities conducted during the 2012 monitoring, indicate concentrations of tritium that are consistent with previous sampling results. This well was drilled into the chimney shortly after the detonation, and water levels continue to rise, demonstrating the very low permeability of the volcanic rocks. Water level data from new wells MV-4 and MV-5 and recompleted well HTH-1RC indicate that hydraulic heads are still recovering from installation and testing. Data from wells MV-4 and MV-5 also indicate that head levels have not yet recovered from the 2011 sampling event during which several thousand gallons of water were purged. It has been recommended that a low-flow sampling method be adopted for these wells to allow head levels to recover to steady-state conditions. Despite the lack of steady-state groundwater conditions, hydraulic head data collected from alluvial wells installed in 2009 continue to support the conceptual model that the southeast-bounding graben fault acts as a barrier to groundwater flow at the site.
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/5961
专题	地球科学
推荐引用方式 GB/T 7714	[null]. 2012 Groundwater Monitoring Report Central Nevada Test Area, Subsurface Corrective Action Unit 443,2013.