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Page 24 of 43 <br /> alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <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 30508 <br /> Method: EPA 60108 <br /> Proiect Former Tracy MGP <br /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> A3-2-15 Solid ICP 5300 07/16/08 07/17/08 080716S01 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Antimony 27 48 50-115 57 0-20 3,4 <br /> Arsenic 88 79 75-125 8 0-20 <br /> Barium 4X 4X 75-125 4X 0-20 Q <br /> Beryllium 98 99 75-125 1 0-20 <br /> Cadmium 98 100 75-125 2 0-20 <br /> Chromium 85 69 75-125 9 0-20 3 <br /> Cobalt 92 89 75-125 2 0-20 <br /> Copper 93 74 75-125 11 0-20 3 <br /> Lead 93 90 75-125 2 0-20 <br /> Molybdenum 81 87 75-125 7 0-20 <br /> Nickel 85 69 75-125 7 0-20 3 <br /> Selenium 83 89 75-125 6 0-20 <br /> Silver 95 97 75-125 2 0-20 <br /> Thallium 92 94 75-125 2 0-20 <br /> Vanadium 86 55 75-125 17 0-20 3 <br /> Zinc 81 50 75-125 13 0-20 3 <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 />