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Page 10 of 26 <br /> alscience <br /> nvironmental Quality Control - PDS / PDSD <br /> aboratories, Inc. <br /> Parsons Date Received 10/24/08 <br /> 2121 North California Blvd., Suite 500 Work Order No: 08-10-2147 <br /> Walnut Creek, CA 94596-7305 Preparation: EPA 3050B <br /> Method: EPA 6010B <br /> Proiect: Tracy SPCC/444692 <br /> Date Date Analyzed PDS/PDSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Number <br /> 08-10-2149-1 Solid ICP 5300 10/24/08 10/24/08 081024503 <br /> Parameter PDS%REC PDSD%REC %REC CL RPD RPD CL Qualifiers <br /> Antimony 106 104 75-125 2 0-20 <br /> Arsenic 92 97 75-125 4 0-20 <br /> Barium 4X 4X 75-125 4X 0-20 Q <br /> Beryllium 100 98 75-125 2 0-20 <br /> Cadmium 99 99 75-125 0 0-20 <br /> Chromium 98 93 75-125 2 0-20 <br /> Cobalt 99 99 75-125 0 0-20 <br /> Copper 105 102 75-125 2 0-20 <br /> Lead 99 99 75-125 0 0-20 <br /> Molybdenum 98 97 75-125 1 0-20 <br /> Nickel 99 100 75-125 1 0-20 <br /> Selenium 99 98 75-125 1 0-20 <br /> Silver 94 93 75-125 1 0-20 <br /> Thallium 85 86 75-125 1 0-20 <br /> Vanadium 100 95 75-125 2 0-20 <br /> Zinc 84 76 75-125 3 0-20 <br /> RPD-Relative Percent Difference, CL-Control Limit <br /> 7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494 FAX: (714) 894-7501 <br />