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Page 25 of 43 <br /> alscience <br /> nvironmental Quality Control - PDS / PDSD <br /> aboratories, Inc. <br /> Parsons Date Received 07/12/08 <br /> 2121 North California Blvd., Suite 500 Work Order No: 08-07-1204 <br /> Walnut Creek, CA 94596-7305 Preparation: EPA 3050B <br /> Method: EPA 6010B <br /> Proiect: Former Tracy MGP <br /> Date Date Analyzed PDS/PDSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Number <br /> A3-2-15 Solid ICP 5300 07/16/08 07/17/08 080716501 <br /> Parameter PDS%REC PDSD%REC %REC CL RPD RPD CL Qualifiers <br /> Antimony 86 87 75-125 1 0-20 <br /> Arsenic 96 97 75-125 1 0-20 <br /> Barium 4X 4X 75-125 4X 0-20 Q <br /> Beryllium 93 94 75-125 1 0-20 <br /> Cadmium 94 95 75-125 1 0-20 <br /> Chromium 92 93 75-125 0 0-20 <br /> Cobalt 93 92 75-125 0 0-20 <br /> Copper 103 103 75-125 0 0-20 <br /> Lead 92 92 75-125 0 0-20 <br /> Molybdenum 92 92 75-125 1 0-20 <br /> Nickel 94 93 75-125 0 0-20 <br /> Selenium 87 89 75-125 2 0-20 <br /> Silver 90 90 75-125 0 0-20 <br /> Thallium 84 84 75-125 1 0-20 <br /> Vanadium 100 100 75-125 0 0-20 <br /> Zinc 95 94 75-125 0 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 />