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Page 8 of 24 <br /> alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> aboratories, Inc. <br /> Parsons Date Received: 07/16/08 <br /> 2121 North California Blvd., Suite 500 Work Order No: 08-07-1414 <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 /> 08-07-1218-2 Solid ICP 5300 07/21/08 07/21/08 080721S01 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Antimony 30 27 50-115 10 0-20 3 <br /> Arsenic 85 88 75-125 3 0-20 <br /> Barium 4X 4X 75-125 4X 0-20 Q <br /> Beryllium 88 86 75-125 2 0-20 <br /> Cadmium 91 89 75-125 2 0-20 <br /> Chromium 86 85 75-125 0 0-20 <br /> Cobalt 89 87 75-125 2 0-20 <br /> Copper 93 93 75-125 0 0-20 <br /> Lead 100 82 75-125 11 0-20 <br /> Molybdenum 81 79 75-125 3 0-20 <br /> Nickel 85 85 75-125 1 0-20 <br /> Selenium 57 54 75-125 6 0-20 3 <br /> Silver 85 84 75-125 1 0-20 <br /> Thallium 74 71 75-125 5 0-20 3 <br /> Vanadium 77 89 75-125 6 0-20 <br /> Zinc 247 408 75-125 26 0-20 3,4 <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 />