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4.0 QUALITY ASSURANCE AND QUALITY CONTROL PROCEDURES <br /> Standard quality assurance/quality control sample (QA/QC) procedures involving the collection <br /> and processing of environmental samples were followed. Clean augers were used to drill each <br /> ' soil boring. Soil sampling equipment was cleaned between soil sample drives as well as between <br /> soil borings. The soil-sampling device was equipped with clean brass liners. Samples collected f <br /> for laboratory testing were removed from the sampling device, capped with new aluminum foil <br /> and new plastic ends caps. <br /> Collected samples were laced in a clear plastic ba which was sealed and labeled with the <br /> P P P g, <br /> sample identification number, depth of sample interval, date, and a CW&M project <br /> number/name. Processed soil samples'were placed in a sturdy, iced cooler, secured and <br /> �ftransported under chain-of-custody procedures by overnight express to Shasta Analytical. <br /> QA/QC field procedures also included the laboratory evaluation of surrogate recoveries and the <br /> r testing of matrix spike samples. All matrix spike samples were within the control limits for the <br /> i <br /> target constituents. An evaluation of the QA/QC results support the conclusions of the <br /> laboratory data set provided herein. <br /> DFT00101.SJCPH5.ARSC.062000 7 <br />