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t4.3 Field Quality Control Samples <br /> To assess the quality of data from field sampling efforts,field quality control samples will be collected. <br /> For liquid samples,field blanks,travel blanks,and duplicate samples will be submitted to the analytical <br /> laboratory. Field quality control samples will be handled in the same way as the original samples,which <br /> they accompany. <br /> 4.3.1 Groundwater Samples <br /> Travel Blanks <br /> The purpose of travel blanks is to detect the introduction of contaminants during transportation from the <br /> field to the laboratory. Travel blanks are assembled by the laboratory,travel to the field,and return to the <br /> laboratory with the samples collected for analysis. These blanks consist of ultra-pure distilled water <br /> sealed in a clean container. Since all samples are analyzed for volatile organics,one travel blank is <br /> required for each sample cooler. <br /> Equipment Blanks <br /> Equipment blanks will be analyzed to detect the introduction of contaminants during sample collection. <br /> Equipment blanks are prepared in the field using procedures that simulate normal sampling. A <br /> minimum of one equipment blank will be collected for each day of sampling. <br /> Field Duplicates <br /> Duplicates will be collected and analyzed to check for sampling consistency and error. Duplicate samples <br /> will be collected immediately after the primary sample from the same location with the same equipment <br /> and procedures. Ten percent of each sample type will be duplicate samples(or a minimum of one <br /> duplicate for each parameter suite). <br /> Field blanks and replicates will be analyzed for the same parameters as the samples. <br /> 4.4 Sample Numbering System <br /> A sample numbering system will be used to identify each sample collected. This system will provide a <br /> tracking number to allow retrieval and cross-referencing of sample information. A listing of the sample <br /> identification numbers will be maintained in the field notebook. The anticipated sample numbering <br /> system for this work plan is described below. <br /> i <br /> 4.4.1 Sample Type <br /> Each sample collected during the sampling program will be identified by a two-character alpha code: <br /> GG-Grab groundwater samples from soil borings <br /> TB-trip blank <br /> Sample location qualifiers will begin with the next sample numeric character following those used in the <br /> Additional Site Characterization Report(CH2M HILL,June 2000). For locations where refusal is met <br /> during drilling,those locations will be labeled with the two-character alpha code,followed by the <br /> sequential numeric character followed by a one-letter sequential alpha character(e.g. GG-10A). Only <br /> those borings completed to the planned depth will be without the final sequential alpha character(e.g. <br /> GG-10). <br /> CATEMKWORKPuw_DCA_1.DOC 10 <br />