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CM0001676 <br />• <br />Page 5 <br />21.1.1 Field Duplicate <br />Field duplicates are used for solid and aqueous matrices and are independent samples which are <br />collected as close as possible to the same point in space and time. These are two separate samples <br />taken from the same source, stored in separate containers, and analyzed independently. These <br />duplicates are useful in documenting the field precision of the sampling process. <br />21.1.2 Equipment Rinseate <br />Equipment rmseate samples are used for solid and aqueous matrices and consist of an analyte-free <br />media which has been used to rinse the sampling equipment. This sample is collected after <br />completion of decontamination and prior to sampling. This sample is useful in documenting <br />adequate decontamination of sampling equipment <br />2LL3 Split Samples <br />Split samples are collected for solid and aqueous matrices and consist of one well-mixed and <br />• homogenized natural sample, which is split in the field into two samples and placed in different <br />bottles for separate analysis. One of the samples may be sent to the primary laboratory and the <br />other split sample to a referee laboratory, or both samples can be sent to the primary laboratory. <br />Each split will have its own sample number. Both split samples will be analyzed for identical <br />chemical parameters. The results of the laboratory split will be compared to determine <br />laboratory precision. <br />2.1.1.4 Field Blank <br />• <br />Field blanks are prepared for aqueous sampling only and provide a measure of various cross- <br />contamination sources, decontamination efficiency, and other potential errors that can be introduced <br />from sources other than the sample. A field blank is prepared using the same protocols as a normal <br />sample, but is not exposed to any sampling equipment. A field blank is prepared in the field and <br />consists of a representative amount of laboratory distilled/deionized (DS/Dl) and/or reagent-grade <br />(analyte-free) water and any necessary preservatives. A field blank is contained in a sample bottle <br />randomly chosen from each lot of bottles received from the supplier. Field blanks are required for <br />all inorganic or organic constituents. <br />PRIVILEGED AND CONFIDENTIAL ===== = <br />C.IPROlECT116102.OOIVlt17610200i(b:ONS( 1W _ U s environ <br />mental