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ARCADIS <br /> 3.3.2 Field Blanks (for soil sampling) <br /> Field blanks are collected by pouring distilled water into appropriate sample containers. <br /> Their purpose is to evaluate the presence of chemicals for which environmental samples <br /> are being analyzed in the water used for equipment decontamination. The field blank <br /> samples are stored and processed in the same manner as the other aqueous samples. <br /> Field blanks will be collected at a minimum frequency of one per field event during <br /> which non-dedicated sampling equipment is used. The field blanks will be submitted to <br /> the laboratory "blind" (i.e., given a fictitious identification number so that the <br /> laboratory will not recognize them as blanks). The field blanks will be analyzed by the <br /> same method, and for the same analytes, as the samples collected with the sampling <br /> equipment. The analytical goal for field blanks is to have no detectable analytes. <br /> 3.3.3 Field Duplicates (for soil sampling) <br /> A field duplicate is a sample that is collected and analyzed in the same manner, and at <br /> the same time and location, as a primary sample. One duplicate will be collected per <br /> 10 primary samples (i.e., 10 percent frequency). Field duplicate samples will be <br /> collected and analyzed to evaluate sampling and analytical precision(reproducibility). <br /> Agreement between primary and duplicate sample results will indicate good sampling <br /> and analytical precision. The precision goal for soil sample field duplicate results will <br /> be 30 percent relative percent difference as compared to the primary results. In cases <br /> where one or both values are below five times the reporting limit, the precision goal is <br /> four times the reporting limit for soil samples. <br /> For soil samples collected using hand-sampling equipment, duplicate samples will be <br /> collected in an identical manner to the primary sample at a collocated sampling <br /> location. <br /> Specific locations for collection of field duplicates are described in Table 1 and are <br /> shown on Figure 2; these locations were selected from across the Site. The field <br /> duplicates will be submitted to the laboratory "blind" (i.e., given a fictitious <br /> identification number so that the laboratory will not recognize them as duplicates). <br /> 3.4 Field Equipment and Calibration <br /> The field equipment to be used by ARCADIS and specific calibration procedures are <br /> discussed below. <br /> List of Field Equipment <br /> ARCADIS will use the following field equipment, materials, and supplies: <br /> wp-PEA-Gordon-Jul10-RV009808.doc: Page 19 <br />