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Page 20 of 35 <br /> alscience �o ; yo; <br /> nvironmental Quality Control - Spike/Spike Duplicate <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 504.1 Ext. <br /> Method: EPA 504.1 <br /> Proiect WFS - Stockton <br /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 08-05-1923-1 Aqueous GC 40 05/21/08 05/22/08 080521S08 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> 1,2-Dibromoethane 100 99 60-140 1 0-25 <br /> 1,2-Dibromo-3-Chloropropane 118 117 60-140 1 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 />