Low-impact sampling under an active solid low-level radioactive waste disposal unit using horizontal drilling technology

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The purpose of this project was to determine the performance of the solid low-level radioactive waste (LLRW) disposal units located on a mesa top at TA-54, Area G, Los Alamos National Laboratory (LANL), Los Alamos, NM, and to provide in-situ (vadose zone) site characterization information to Area G`s Performance Assessment. The vadose zone beneath an active disposal unit (DU 37), was accessed by utilizing low-impact, air-rotary horizontal drilling technology. Core samples were pulled, via wire-line core method, in 3 horizontal holes fanning out below DU 37 at approximately 5 foot intervals depending on recovery percentage. Samples were surveyed and prepared ... continued below

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9 p.

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Puglisi, C.V. & Vold, E.L. December 1, 1995.

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Description

The purpose of this project was to determine the performance of the solid low-level radioactive waste (LLRW) disposal units located on a mesa top at TA-54, Area G, Los Alamos National Laboratory (LANL), Los Alamos, NM, and to provide in-situ (vadose zone) site characterization information to Area G`s Performance Assessment. The vadose zone beneath an active disposal unit (DU 37), was accessed by utilizing low-impact, air-rotary horizontal drilling technology. Core samples were pulled, via wire-line core method, in 3 horizontal holes fanning out below DU 37 at approximately 5 foot intervals depending on recovery percentage. Samples were surveyed and prepared in-field following Environmental Restoration (ER) guidelines. Samples were transferred from the field to the CST-9 Radvan for initial radiological screening. Following screening, samples were delivered to CST-3 analytical lab for analyses including moisture content, 23 inorganics, 60 volatile organic compounds (VOC`s), 68 semivolatile organic compounds (SVOC`s), tritium, lead 210, radium 226 & 228, cesium 137, isotopic plutonium, americium 241, strontium 90, isotopic uranium, and isotopic thorium. Other analyses included matric potential, alpha spectroscopy, gamma spectroscopy, and gross alpha/beta. The overall results of the analysis identified only tritium as having migrated from the DU. Am-241, Eu-152, and Pu-238 were possibly identified above background but the results are not definitive. Of all organics analysed for, only ethyl acetate was tentatively identified slightly above background. All inorganics were found to be well below regulatory limits. Based on the results of the above mentioned analyses, it was determined that Area G`s disposal units are performing well and no significant liquid phase migration of contaminants has occurred.

Physical Description

9 p.

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INIS; OSTI as DE96002585

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 27 Nov - 1 Dec 1995

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  • Other: DE96002585
  • Report No.: LA-UR--95-3691
  • Report No.: CONF-951155--5
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 137285
  • Archival Resource Key: ark:/67531/metadc623372

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  • December 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 29, 2016, 3:58 p.m.

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Puglisi, C.V. & Vold, E.L. Low-impact sampling under an active solid low-level radioactive waste disposal unit using horizontal drilling technology, article, December 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc623372/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.