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equipment is used. The field equipment blanks should be analyzed using the same analyses <br /> requested for the associated primary samples. <br /> Trip Blanks <br /> Trip blanks samples serve to detect potential additional sources of contamination that could <br /> influence concentration values reported in field samples,both quantitatively and qualitatively. <br /> These samples are used as a mechanism of control for sample bottle preparation, blank water <br /> quality, and sample handling. Trip blanks are generally submitted to the laboratory for analysis of <br /> VOCs. <br /> The trip blank consists of a VOC sample vial filled in the laboratory with American Society of <br /> Testing and Materials (ASTM) Type H reagent grade water. The trip blank travels to the site with <br /> the empty sample bottles and returns from the site with the collected field samples in an effort to <br /> simulate sample handling conditions. One trip blank will be included in each shipping container <br /> transporting samples for VOC analysis. The following are potential sources of contamination in <br /> trip blanks: <br /> • Laboratory reagent water; <br /> • Sample containers; <br /> • Cross-contamination during shipment; <br /> • Ambient air or contact with analytical instrumentation during preparation and <br /> analysis at the laboratory; and <br /> • Laboratory reagents used in analytical procedures. <br /> When a trip blank is identified as contaminated, the appropriate validation flag, as described in <br /> the applicable validation procedure, will be applied to the associated sample results. Other issues <br /> affecting the use and integrity or trip blanks include the following: <br /> • Handling: Trip blanks may be held on site for a maximum of one week. The temperature 2 <br /> of trip blanks during storage will be maintained at 4 degrees Celsius. Expired trip blanks <br /> will be returned to the laboratory for disposal; and <br /> Environmental/LNC/Workplan/Appendix3.wpd 13 <br />