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Page 49 of 82 <br /> alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> aboratories, Inc. <br /> Parsons Date Received: 07/10/08 <br /> 2121 North California Blvd., Suite 500 Work Order No: 08-07-0848 <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 /> BK-TR-4 Solid ICP 5300 07/10/08 07/11/08 080710S10 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Antimony 31 26 50-115 17 0-20 3 <br /> Arsenic 96 99 75-125 3 0-20 <br /> Barium 122 123 75-125 0 0-20 <br /> Beryllium 104 103 75-125 1 0-20 <br /> Cadmium 101 101 75-125 0 0-20 <br /> Chromium 99 99 75-125 0 0-20 <br /> Cobalt 101 101 75-125 0 0-20 <br /> Copper 104 106 75-125 1 0-20 <br /> Lead 103 103 75-125 1 0-20 <br /> Molybdenum 90 90 75-125 1 0-20 <br /> Nickel 104 104 75-125 1 0-20 <br /> Selenium 88 89 75-125 1 0-20 <br /> Silver 94 95 75-125 1 0-20 <br /> Thallium 90 90 75-125 1 0-20 <br /> Vanadium 101 103 75-125 1 0-20 <br /> Zinc 104 109 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 />