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Page 63 of 82 <br /> alscience <br /> =nvironmental Quality Control - LCS/LCS Duplicate <br /> Aw aboratories, Inc. <br /> Parsons Date Received: N/A <br /> 2121 North California Blvd., Suite 500 Work Order No: 08-07-0848 <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 /> 097-01-002-11,208 Solid ICP 5300 07/10/08 07/11/08 08071OL10 <br /> Parameter LCS%REC LCSD%REC %REC CL ME CL RPD RPD CL Qualifiers <br /> Antimony 103 102 80-120 73-127 0 0-20 <br /> Arsenic 100 100 80-120 73-127 0 0-20 <br /> Barium 109 110 80-120 73-127 0 0-20 <br /> Beryllium 101 99 80-120 73-127 2 0-20 <br /> Cadmium 108 107 80-120 73-127 1 0-20 <br /> Chromium 103 103 80-120 73-127 1 0-20 <br /> Cobalt 108 108 80-120 73-127 0 0-20 <br /> Copper 105 105 80-120 73-127 0 0-20 <br /> Lead 107 106 80-120 73-127 1 0-20 <br /> Molybdenum 102 103 80-120 73-127 0 0-20 <br /> Nickel 109 110 80-120 73-127 0 0-20 <br /> Selenium 97 99 80-120 73-127 2 0-20 <br /> Silver 99 99 80-120 73-127 0 0-20 <br /> Thallium 103 104 80-120 73-127 1 0-20 <br /> Vanadium 102 102 80-120 73-127 0 0-20 <br /> Zinc 107 107 80-120 73-127 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 />