Sampling errors associated with soil composites used to estimate mean Ra-226 concentrations at an UMTRA remedial-action site

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The decision whether to take additional remedial action (removal of soil) from regions contaminated by uranium mill tailings involves collecting 20 plugs of soil from each 10-m by 10-m plot in the region and analyzing a 500-g portion of the mixed soil for /sup 226/Ra. A soil sampling study was conducted in the windblown mill-tailings flood plain area at Shiprock, New Mexico, to evaluate whether reducing the number of soil plugs to 9 would have any appreciable impact on remedial-action decisions. The results of the Shiprock study are described and used in this paper to develop a simple model of ... continued below

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Gilbert, R.O.; Baker, K.R.; Nelson, R.A.; Miller, R.H. & Miller, M.L. July 1, 1987.

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Description

The decision whether to take additional remedial action (removal of soil) from regions contaminated by uranium mill tailings involves collecting 20 plugs of soil from each 10-m by 10-m plot in the region and analyzing a 500-g portion of the mixed soil for /sup 226/Ra. A soil sampling study was conducted in the windblown mill-tailings flood plain area at Shiprock, New Mexico, to evaluate whether reducing the number of soil plugs to 9 would have any appreciable impact on remedial-action decisions. The results of the Shiprock study are described and used in this paper to develop a simple model of the standard deviation of /sup 226/Ra measurements on composite samples formed from 21 or fewer plugs. This model is used to predict as a function of the number of soil plugs per composite, the percent accuracy with which the mean /sup 226/Ra concentration in surface soil can be estimated, and the probability of making incorrect remedial action decisions on the basis of statistical tests. 8 refs., 15 figs., 9 tabs.

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NTIS, PC A04/MF A01; 1.

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  • Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted

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  • Other: DE87013838
  • Report No.: PNL-6262
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/6350889 | External Link
  • Office of Scientific & Technical Information Report Number: 6350889
  • Archival Resource Key: ark:/67531/metadc1212025

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  • July 1, 1987

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Oct. 19, 2018, 1:15 p.m.

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Gilbert, R.O.; Baker, K.R.; Nelson, R.A.; Miller, R.H. & Miller, M.L. Sampling errors associated with soil composites used to estimate mean Ra-226 concentrations at an UMTRA remedial-action site, report, July 1, 1987; United States. (digital.library.unt.edu/ark:/67531/metadc1212025/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.