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Page 25 of 35 <br /> alscience <br /> nvironmental Quality Control - Duplicate <br /> "� <br /> aboratories, Inc. <br /> n e <br /> GeoSyntec Consultants Date Received: N/A <br /> 475 14th Street, Suite 450 Work Order No: 08-05-1902 <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 08-05-1920-1 05/21/08 7.64 7.67 0 0-25 <br /> Carbon Dioxide SM4500-0O2D 08-05-1901-11 05/21/08 55 54 3 0-25 <br /> Alkalinity,Total(as CaCO3) SM 2320B 08-05-1901-11 05/21/08 410 408 0 0-25 <br /> Ammonia(as N) SM 4500-NH3 B/E 08-05-1901-2 05/27/08 ND ND NA 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 />