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• Page 5 <br /> Z1.1.1 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 /> Z 1.1.2 Equipment Rinseate <br /> Equipment rinseate 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 /> Z.1.1.3 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 /> Z1.1.4 Field Blank <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/DI) 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 /> • <br /> PRIVILEGED AND CONFIDENTIAL '�- <br /> - <br /> CAPROlECTS16102.0OIUt1176102.001(6/20l96( � � � v�M Envirorunental <br />