Remedial investigation and feasibility study for the Lawrence Livermore National Laboratory Site 300 Pit 7 Complex

Taffet, M J; Oberdorfer, June A.; McIlvride, W.

doi:10.2172/5064754

Cited by 9 publications

(13 citation statements)

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“…The remedial activities completed at was prepared in response to DOE's Tiger Site 300 during the fourth quarter of 1990 Team Assessment of LLNL operations, are described in the document, Lawrence The Action Plan includes descriptions of Livermore National Laboratory Site 300 the actions to be taken at the site to respond Environmental Investigations Quarterly, satisfactorily to the findings; to show October-December 1990 (UCAR-10194-90-4) schedules and due dates for activities; and (Carlsen et al 1990). This document was to identify parties responsible for implesubmitted to the RWQCB by February 15, menting the Action Plan.…”

Section: Discussionmentioning

confidence: 99%

“…The contours are based on water levels in Site 300 Taffet et al aquifers present beneath those parts of 1989a). The perched spring in the south Site 300 where water level measurements part of the HE Process Area is an outcrop are available.…”

Section: Site 300mentioning

confidence: 99%

“…One program is designed to meet regulatory commitments established for specific site investigations, such as the investigation of trichloroethylene (TCE), tritium, and high-explosives (HE) compounds in groundwater at Site 300. Details of this program are described in the LLNL Site 300 Environmental Investigations Quarterly Reports (Lamarre et al 1990a-c;Carlsen et al 1990) …”

Section: Introductionmentioning

confidence: 99%

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Lawrence Livermore National Laboratory environmental report for 1990

Sims¹,

Surano²,

Lamson³

et al. 1990

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DISCLAIMERThis document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for any apparatus, product, or process disclosed, or represents that its use would not infringe on privately owned rights. References herein to any specific commercial products, process or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The views and opinions expressed herein shall not be used for advertising or product endorsement purposes.

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Section: Discussionmentioning

confidence: 99%

Section: Site 300mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lawrence Livermore National Laboratory environmental report for 1990

Sims¹,

Surano²,

Lamson³

et al. 1990

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“…Computer modeling of the transport and fate of the tritium indicates that by the time the tritiated water from sites of known ground water contamination reaches the Site 300 boundary, the tritium will have decayed to near background activities. Details of the remedial investigation for the East and West Firing Areas are discussed in several reports including Taffet et al (1989) and the Final SWRI report. Past monitoring has also revealed trace amounts of TCE in ground water near the Pit 7 Complex (from Pit 5) and at Building 801.…”

Section: East and West Firing Areasmentioning

confidence: 99%

“…This sampling location is adjacent to a landfill that contains debris contaminated with tritium from past experiments. The landfill area is under continued investigation for tritium in soil and ground water, as described in reports published as part of LLNL's Environmental Restoration Program (Lamarre 1989a(Lamarre , 1989b(Lamarre , and 1989cTaffet et al 1989a and1989b;Taffet et al 1991;Carlsen 1991a andand Webster-Scholten 1994). In the past, purge water from samples of ground water monitoring wells was released to the ground at this location.…”

Section: Vegetation and Foodstuff Monitoringmentioning

confidence: 99%

Environmental Report 1995. Volume 1

Harrach¹,

Failor²,

Gallegos³

1996

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Performance of a mixed-waste landfill amid geologic uncertainty—learning from a case study: Altamont Hills, California, U.S.A.

Taffet

Lamarre

Oberdorfer

1991

Environ. Geol. Water Sci

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This paper presents a case study that illustrates how geologic factors, which are not always obvious without extensive study, may hamper later landfill performance. The site is Lawrence Livermore National Laboratory (LLNL) site 300. Two unlined landfills, opened in 1958, and 1968, contain small amounts of tritium, uranium-238, lead, and beryllium in a vast proportion of inert materials (gravel, wood, and plastic). Groundwater analyses indicate that tritium at activities up to 600,000 picoCuries per liter (pCi/I) is present in two plumes beneath and adjacent to the landfills within a perched water-bearing zone.The affected water-bearing zone averages 2 m in thickness and occurs within the late Miocene Neroly Formation, which is composed of feldspathic sandstones and siltstones and interbedded claystones and conglomerates. Scanning election microscopy (SEM) analysis indicates that diagenetic clays have occluded the porosity of much of the sandstones. However, abundant fractures appear to provide permeability.Depth to the water table fluctuates greatly beneath the site but averages about 10 m. In the past, following heavy rains, groundwater levels rose into the landfill bottoms and mobilized the tritium. Rapid recharge and rise of water levels appear to have been enhanced by the funnelling of surface water by topography, direct infiltration through fractures and permeable landfill materials, and the low permeability of the geologic materials that comprise the water-bearing zone. These and other hydrogeologic conditions contributed to groundwater contact with landfill materials but were not known before landfill construction. Such information is important for siting landfills in the current regulatory environment. Contaminant transport modeling indicates that even if the perched water-bearing zone were continuous to the site 300 boundary, tritium activities would undergo radioactive decay to background levels by the time the tritiated water could reach the site boundary.

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Remedial investigation and feasibility study for the Lawrence Livermore National Laboratory Site 300 Pit 7 Complex

Cited by 9 publications

References 0 publications

Lawrence Livermore National Laboratory environmental report for 1990

Lawrence Livermore National Laboratory environmental report for 1990

Environmental Report 1995. Volume 1

Performance of a mixed-waste landfill amid geologic uncertainty—learning from a case study: Altamont Hills, California, U.S.A.

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