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Page 16 of 24 <br /> alscience �o w U Roy <br /> _nvironmental Quality Control - LCS/LCS Duplicate <br /> JQ <br /> mw aboratories, Inc. <br /> ne r <br /> Parsons Date Received: N/A <br /> 2121 North California Blvd., Suite 500 Work Order No: 08-07-1414 <br /> Walnut Creek, CA 94596-7305 Preparation: EPA 3050B <br /> Method: EPA 6010B <br /> Project: Former Tracy MGP <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 097-01-002-11,281 Solid ICP 5300 07/21/08 07/21/08 08072111-01 <br /> Parameter LCS%REC LCSD%REC %REC CL RPD RPD CL Qualifiers <br /> Antimony 89 88 80-120 1 0-20 <br /> Arsenic 97 97 80-120 0 0-20 <br /> Barium 95 95 80-120 0 0-20 <br /> Beryllium 86 87 80-120 1 0-20 <br /> Cadmium 95 94 80-120 0 0-20 <br /> Chromium 90 90 80-120 1 0-20 <br /> Cobalt 95 95 80-120 0 0-20 <br /> Copper 93 92 80-120 0 0-20 <br /> Lead 93 93 80-120 0 0-20 <br /> Molybdenum 91 91 80-120 0 0-20 <br /> Nickel 96 95 80-120 1 0-20 <br /> Selenium 84 84 80-120 0 0-20 <br /> Silver 90 89 80-120 1 0-20 <br /> Thallium 89 89 80-120 0 0-20 <br /> Vanadium 90 90 80-120 1 0-20 <br /> Zinc 91 91 80-120 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 />