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Page 13 of 29 <br /> alscience <br /> nvironmental Quality Control - PDS / PDSD <br /> aboratories, Inc. <br /> Parsons Date Received 10/21/08 <br /> 2121 North California Blvd., Suite 500 Work Order No: 08-10-1812 <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 /> SPCC-13-1-4 Solid ICP 5300 10/21/08 10/21/08 081021502 <br /> Parameter PDS%REC PDSD%REC %REC CL RPD RPD CL Qualifiers <br /> Antimony 92 89 75-125 3 0-20 <br /> Arsenic 88 94 75-125 5 0-20 <br /> Barium 4X 4X 75-125 4X 0-20 Q <br /> Beryllium 95 94 75-125 1 0-20 <br /> Cadmium 95 94 75-125 1 0-20 <br /> Chromium 92 92 75-125 0 0-20 <br /> Cobalt 93 93 75-125 0 0-20 <br /> Copper 104 106 75-125 1 0-20 <br /> Lead 94 95 75-125 1 0-20 <br /> Molybdenum 97 96 75-125 1 0-20 <br /> Nickel 89 92 75-125 1 0-20 <br /> Selenium 91 91 75-125 1 0-20 <br /> Silver 95 95 75-125 1 0-20 <br /> Thallium 89 89 75-125 0 0-20 <br /> Vanadium 92 92 75-125 0 0-20 <br /> Zinc 48 46 75-125 1 0-20 5 <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 />