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Page 10 of 19 <br /> alscience �o ; yo; <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> aboratories, Inc. <br /> ne <br /> Parsons Date Received: 04/18/09 <br /> 2121 North California Blvd., Suite 500 Work Order No: 09-04-1683 <br /> Walnut Creek, CA 94596-7305 Preparation: EPA 50308 <br /> Method: EPA 80158 <br /> Proiect PG&E TRACY MGP SITE <br /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> TW-5 Aqueous GC 24 04/22/09 04/22/09 090422S02 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Gasoline Range Organics 91 89 68-122 3 0-18 <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 />