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u <br />0 <br />0 <br />u <br />0 <br />11 <br />G <br />LABORATORY QUALITY ASSURANCE/QUALITY CONTROL <br />The laboratories that will perform the chemical analyses for the ASWAT <br />program use extensive quality assurance and quality control procedures <br />to ensure the quality of laboratory results. These procedures test the <br />accuracy of standards, performance of equipment, and reproducibility of <br />results. Toward this end, all analyses, quality control assessments, <br />and data reduction tasks will be performed by qualified analytical <br />chemists. In addition, certified analytical reports are reviewed by at <br />least two supervisory personnel. <br />All sample containers are prepared in accordance with the Air Resources <br />Board document "Procedure for Fabrication and Testing of Sample Bags." <br />Primary standards for each analyte are traceable to the National Bureau <br />of Standards. When a primary standard is replaced, the chemical purity <br />of the new and old standards are compared. Carrier and make-up gases <br />consist of the highest purity analytical gases available. <br />A three-point standard calibration is performed after instrument mainte- <br />nance or repair, and after changes in analytical conditions. At a mini- <br />m, the calibration curve is prepared monthly. A calibration standard <br />is analyzed daily, and the response of this standard is compared with <br />previous standard analyses and with the calibration curve. If the value <br />of the calibration standard is not within 10 percent of historical <br />values, the analysis of the standard is repeated. If the value again is <br />not within 10 percent of historical values, the analysis is halted, the <br />instrument is checked and adjusted as necessary, and a quality assurance <br />report is generated. Instrument set -points and conditions are recorded <br />daily, and a record of all maintenance and repair work is maintained. <br />u <br />Blanks, duplicates, <br />and spikes are analyzed to monitor <br />the accuracy of <br />results. A blank is <br />analyzed daily between calibration <br />and sample anal- <br />yses and as necessary. A minimum of 10 percent of all <br />samples are ana- <br />lyzed in duplicate, <br />and a minimum of 10 percent of samples <br />are spiked in <br />the laboratory with <br />one or more analytes. Results of <br />quality control <br />PJI 9390301 <br />17 <br />u <br />