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Page 3 of 6 <br /> alscience <br /> nvironmental Quality Control - Duplicate <br /> aboratories, Inc. <br /> GeoSyntec Consultants Date Received: N/A <br /> 475 14th Street, Suite 450 Work Order No: 08-08-0742 <br /> Oakland, CA 94612-1940 <br /> Project: W FS - Stockton <br /> Matrix: Aqueous <br /> Parameter Method QC Sample ID Date Analyzed Sample Conc DUP Conc RPD RPD CL Qualifiers <br /> pH SM 4500 H+B 08-08-0729-1 08/08/08 6.98 6.97 0 0-25 <br /> Ammonia(as N) SM 4500-NH3 B/E 08-08-0507-3 08/11/08 0.63 0.60 6 0-25 <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 />