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-19- <br /> • Replicates of samples and spikes, minimum of 10% of all <br /> samples . <br /> . Control samples run periodically. <br /> • Control charts on critical parameters . <br /> . Corrective action program. <br /> . Several types of blanks run frequently. <br /> • Two levels of review of all work , peer and supervisor . <br /> • Systematic review by a Quality Assurance Officer . <br /> • Access to professional support . <br /> . Maintains QA/QC surveillance over all subcontracted work <br /> under the same rules and guidelines expected of them. <br /> • Maintains several types of logs , i .e. : <br /> - Sample logs. <br /> - Instrument logs . <br /> - Calibration and tuning logs . <br /> - Maintenance logs . <br />