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8.0 OUAL[TY CONTROL <br />8.1 All quality control data should be maintained and available for easy <br />reference or inspection. <br />8.2 Calibration curves must be composed of a minimum of a blank and three <br />i standards. A calibration curve should be made for every hour of continuous <br />sample analysis. <br />8.3 Dilute samples if they are more concentrated than the highest <br />standard or if they fall on the plateau of a calibration curve. <br />8.4 Employ a minimum of one blank per sample batch to determine if <br />contamination or any memory effects are occurring. <br />8.5 Verify calibration with an independently prepared check standard <br />every 15 samples. <br />8.6 Run one spike duplicate sample for every 10 samples. A duplicate <br />sample is a sample brought through the entire sample preparation and analytical <br />process. <br />8.7 The method of standard additions (see Method 7000, Section 8.7) shall <br />be used for the analysis of all EP extracts, on all analyses submitted as part <br />of a delisting petition, and whenever a new sample matrix is being analyzed. <br />9.0 METHOD PERFORMANCE <br />9.1 Precision and accuracy data are available in Method 270.2 of Methods <br />for Chemical Analysis of Water and Wastes. <br />9.2 The data shown in Table 1 were obtained from records of state and <br />contractor laboratories. The data are intended to show the precision of the <br />combined sample preparation and analysis method. <br />10.0 REFERENCES <br />1. Methods for Chemical Analysis of Water and Wastes. EPA-600/4-82-055, <br />December 1982. Method 270.2. <br />2. Gaskill, A., Compilation and Evaluation of RCRA Method Performance Data, <br />Work Assignment No. 2, EPA Contract No. 68 01-7075, September 1986. <br />7740 - 5 <br />CD-ROM Revision 0 <br />Date September 1986 <br />