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SAMPLE QUALITY ASSURANCE/QUALITY CONTROL <br /> Sample quality will be checked by the use of proper sampling, <br /> handling and testing methods. Examples of quality control methods <br /> are use of background samples, equipment rinse samples, and trip <br /> and field blanks. Chain of custody forms, use of a DHS certified <br />' laboratory, acceptable detection limits and proper sample <br /> preservation and holding times also provide assurance of accurate <br /> analytical data. <br /> I <br /> Background Samples <br /> I Procedures and methods used to obtain, handle, prepare, transport <br /> and analyze background samples will be identical to those used for <br /> site samples. Background samples will be used to define conditions <br />' at the site before the unauthorized release. <br /> An equipment rinse sample will be utilized to detect residual <br />' contamination on sampling apparatus. Sampling equipment will be <br /> filled with distilled water which will then be transferred to a <br /> sample container. <br />' Sample blanks will be used to check for cross-contamination during <br /> sample collection, transport and in the laboratory. Two types of <br /> sample blanks will be utilized; trip blanks will be used to verify <br /> handling, storage and shipment conditions, field blanks will be <br /> used to confirm site conditions . <br /> Trip blanks will either be prepared by the analytical laboratory or <br />' the responsible professional before traveling to the work site. <br /> one trip blank will be used for each sample set of 20 samples . At <br />' least 5% trip blanks will be used for sets greater than 20 samples . <br /> Trip blanks will remain with the collected samples during <br /> transportation and will be analyzed with the field samples to check <br />' for any introduced contamination. Trip blanks will not be opened <br /> by either the sample collectors or handlers. <br /> Field blanks water samples will be opened and exposed at the <br />' sampling site to detect contamination from air exposure. The <br /> sample will be poured into the sample container to simulate actual <br /> sampling conditions . <br /> Chain of Custody Forms <br /> C Y_ <br />' A chain of custody form will be generated for all site samples . <br /> The form will accompany the samples from the time of generation to <br /> time of analysis. Originals will be retained even if illegibility <br />' or inaccuracies require preparation of a replacement. Any <br /> corrections will be initialed and dated. Copies will be retained <br /> by the supervising professional . <br /> 1 <br />