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Page 58 of 89 <br /> alscience 04X90 <br /> nvironmental Quality Control - PDS / PDSD Q° <br /> aboratories, Inc. _ ne6 <br /> Parsons Date Received 07/11/08 <br /> 2121 North California Blvd., Suite 500 Work Order No: 08-07-1058 <br /> Walnut Creek, CA 94596-7305 Preparation: EPA 3050B <br /> Method: EPA 6010B <br /> Prosect: Former Tracy MGP <br /> Date Date Analyzed PDS/PDSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Number <br /> 1132-1-5 Solid ICP 5300 07/14/08 07/16/08 080714508 <br /> Parameter PDS%REC PDSD%REC %REC CL RPD RPD CL Qualifiers <br /> Antimony 100 104 75-125 3 0-20 <br /> Arsenic 111 115 75-125 3 0-20 <br /> Barium 4X 4X 75-125 4X 0-20 Q <br /> Beryllium 108 110 75-125 1 0-20 <br /> Cadmium 108 109 75-125 1 0-20 <br /> Chromium 108 109 75-125 1 0-20 <br /> Cobalt 108 110 75-125 1 0-20 <br /> Copper 119 121 75-125 1 0-20 <br /> Lead 106 107 75-125 1 0-20 <br /> Molybdenum 106 108 75-125 2 0-20 <br /> Nickel 110 113 75-125 1 0-20 <br /> Selenium 110 107 75-125 3 0-20 <br /> Silver 105 106 75-125 1 0-20 <br /> Thallium 99 102 75-125 3 0-20 <br /> Vanadium 112 113 75-125 1 0-20 <br /> Zinc 50 51 75-125 0 0-20 5 <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 />