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41 D 4874
<br /> ' flow rates, and quantities of effluent collected between flow The column effluents were analyzed by a single laboratory
<br /> rate determinations, for metals by emission spectroscopy using an inductively
<br /> 1 1.1.11 Date, lime, and duration of all flow stoppages, coupled plasma source. Those metals that were measured at
<br /> 1 1.1.18 Observations of unusual conditions in the concentrations above the method detection limits were used
<br /> column, such as density variations, cracks, gas-filled spaces, to determine the precision of the column extraction method
<br /> or evidence of fluid channeling along column walls, according to Practice E 691. The precision identified in the
<br /> ' 11.1.19 Date and lime that the tester began and finished study was a measure of the ability of the column method to
<br /> collecting each void volume and the number of void volumes generate effluents of similar quality from a single waste
<br /> collected, material in tests conducted at different laboratories, or in
<br /> 11.1.20 Type and material of construction of sampling tests using multiple columns at a single laboratory. A
<br /> ' containers and methods used to clean sample container, summary of the precision data is contained in Table I. The
<br /> 11.1.21 Steps taken to avoid sample contact with air complete interlabomtory study is described in Ref(5). The
<br /> where such steps arc called for in the test method, pooled within-interlaboratory relative standard deviation for
<br /> 11.1.22 Results of measurements of index properties and metals data averaged 33%.The overall interlaboratory single
<br /> ' any other analyses performed on unfiltered samples within 1 test reproducibility in terms of standard deviation was 54 %.
<br /> h of collecting the void volume from the column.The results This excludes interlaboratory analytical effects because all
<br /> of the analyses of that water used to saturate and leach the analyses were performed by a central laboratory.The analyt-
<br /> waste must also be included,and ical precision reported by the central laboratory, at concen-
<br /> ' I f.1.23 AB analytical data requested in disposal scenario trations most frequently measured, was seldom greater than
<br /> with complete documentation and traceability through tabo- 5 % relative standard deviation.
<br /> ratory records. 12.2 Precision data for organic constituents are not avail-
<br /> able.
<br /> ' 12. Recision and Bias 12.3 Bias—It is not possible to determine the bias of this
<br /> 12.1 Precision—The precision of this test method has lest method because there are no accepted reference effluents
<br /> been studied for inorganic materials in a three-laboratory generated.
<br /> ' study involving triplicate columns at each laboratory.Fly ash
<br /> was used as a waste material. Bemuse the fly ash was of very 13. Keywords
<br /> low permeability,end caps without radial grooves were used. 13.1 column leach; leachate; waste leaching technique
<br /> REFERENCES
<br /> (1) Grove, D. B., and Stouenwerk, K. G.. "Modeling the Rate- librium Adwrptloo-Demrption of Pesticides During Steady-Flow
<br /> controlled Sorption of Hexavalem Chromium," Water Resources in Soils," Soil Science Sociery of Anse ux;Journal, Vol 43, 1979,
<br /> ' Resemch,Vol 21.No. 11, 1985,pp. 1703-1709. pp.22-28.
<br /> (2) Parker,J.C.,and Van Genudtrea,M.T.,"Determining Transport (4) Handbook for Sampling and Sarrtprr Preservalion of Woler and
<br /> Parameters from Laboratory and Field Tni= Experiments," Wasle%wer,EPA 600/4-82-029,September 1982.
<br /> Bulletin No, 84.3, Virginia Agricultural Experimenl Station, (5) Miner, R. A., Van Maltby, C., Dell, L. R.. "The Results of an
<br /> ' Virginia Polyteehnical Institute and State University, Blacksburg, Intertatwratory Study of a Column Method for Leaching Solid
<br /> VA, 1984. Wane; Symposluln on Hazardous and Industrial Solid Waste
<br /> (3) Rao, P.S. C., Davidson,J. M.,Jessup, R. E., add SeUm, H. M., Testing and Disposal,6W ed.,ASTM STP 933.ASTM, 1986.
<br /> "Evaluation of Conceptual Models for Describing Non-Fqui-
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<br /> teowtail owwA`Ne,w do you fey mend d you law tar year camaunis have nor nMed a to hawing you ehaAd wee your
<br /> rkna krtowri to Ow ASTM t onanlha on StrMrab, 100 err Harbor OrtM West OonshNtcckrc PA 19418.
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