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%W"I '%.� <br /> 3.3.3 Matrix Spikes and DuplicateslSpike Duplicates <br /> To assess analytical accuracy, the laboratory will automatically perform <br /> matrix spikes at frequencies appropriate for the specific analysis. To <br /> assess analytical precision, the laboratory will run laboratory duplicates <br /> (either matrix spiked or unspiked). The laboratory will perform the <br /> matrix spike on a portion of soil immediately adjacent to the sample or <br /> on the duplicate soil sample in the stainless steel or brass tube. <br /> 3.3.4 Laboratory Calibration <br /> Calibration is necessary for standard solutions and for instruments <br /> running organics analyses. The laboratory will follow any calibration <br /> procedures listed for the particular method. Generally, at a minimum, <br /> the analytical laboratory will: <br /> • Run a method (reagent) blank. <br /> • Perform a 3-point (minimum) calibration to verify instrument <br /> linearity for instrument methods. <br /> • Use calibration solutions from the National Bureau of Standards <br /> or the EPA, whenever such standards are available. <br /> • Check and approve commercial standards and reagents for purity <br /> prior to use in analysis. <br /> • Assign a code number to all standards prepared for laboratory use. <br /> Technicians enter the standard code number in a bound standard <br /> notebook, along with all information regarding the preparation of <br /> that standard, (i.e., date, technician, name of each compound and <br /> amount used, final volume, and solvent used). All standard con- <br /> tainers will have labels indicating the standard type, lot number, <br /> code, and date. <br /> The working lifetime of standard preparations will depend on the <br /> compound types comprising the standards. The analytical laboratory <br /> will follow the shelf-life recommendations of the laboratory responsi- <br /> ble for preparing the standards. <br /> 3.35 Laboratory Audit <br /> The analytical laboratory will perform regular internal systems and <br /> performance audits. ERM-West will qualify the laboratory to ensure <br /> that proper quality assurance measures are being incorporated into <br /> sample handling and analysis. <br /> 3-3 <br />