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Page 19 of 35 <br /> alscience <br /> A. nvironmental Quality Control - PDS / PDSD <br /> aboratories, Inc. <br /> ne <br /> GeoSvntec Consultants Date Received 05/21/08 <br /> 475 14th Street, Suite 450 Work Order No: 08-05-1902 <br /> Oakland, CA 94612-1940 Preparation: EPA 3010A Total <br /> Method: EPA 60106 <br /> Proiect: WFS - Stockton <br /> Date Date Analyzed PDS/PDSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Number <br /> 08-05-1956-1 Aqueous ICP 5300 05/22/08 05/23/08 080522SA3 <br /> Parameter PDS%REC PDSD%REC %REC CL RPD RPD CL Qualifiers <br /> Iron 100 99 75-125 0 0-21 <br /> Manganese 96 97 75-125 0 0-7 <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 />