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• Laboratory quality assurance/quality control procedures are summarized below: <br /> — Method Blank Frequency=one per 10 samples <br /> — Matrix Spike/Matrix Spike Duplicate=one per 10 samples <br /> — Laboratory Control Sample/Laboratory Control Sample Duplicate =one per <br /> 10 samples <br /> SAC/DP-N.Irancfp]lProjectsl8318370841wp&hsplStockton&Patterson wp.doc A-3 <br /> 513102 <br />