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Section No. 4.0 <br /> Revision No. 6 <br /> Date 6/1/88 <br /> Page 2 <br /> 4.0 SAMPLING PROCEDURES <br /> A critical element in any sampling process is to obtain a representative <br /> sample. A representative sample is a subsample which accurately represents <br /> the universe (total) sample. Characteristics such as variation and <br /> heterogeneity are assumed to be the rule rather than the exception, thus, <br /> analytical results will randomly reflect these characteristics. <br /> Generally, sampling is performed by either the client or Canonie's <br /> engineering staff; however, Canonie Environmental Services Corp can provide <br /> its own sampling service upon request. Sampling procedures and sample <br /> presentation techniques used by the laboratory are found in the following <br /> �f <br /> references: <br /> i <br /> i <br /> Test Methods for Evaluating Solid Waste - Physical/Chemical <br /> Methods, SW-846 (3rd Edition, 1586) <br /> Methods for Chemical Analysis of Water & Wastes, <br /> EPA-606/4-19-020 <br /> Standard Methods for the Examination of Water and Wastewater, <br /> APHA-AWWAWPCF (16th Edition, 1955) <br /> Once the sample has been taken, its chemical & physical integrity should be <br /> maintained until all analytical measurements are completed. Preservation <br /> techniques are dependent on sample matrix and analytical procedure to be <br /> performed. Usually, maintaining a sample on ice during transport is <br /> sufficient. Another factor influencing sample integrity is the length of time <br /> the sample is held prior to analysis. This time is termed "holding time", <br /> defined as the maximum period of time that can elapse from sampling to <br /> measurement before significant deterioration can be expected to occur. <br /> •�, <br /> Ca�tome.._��-,_ <br /> ia- <br />