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alscience <br />nvironmental <br />aboratories, Inc. <br />Cardno ERI <br />601 North McDowell Blvd. <br />Petaluma, CA 94954-2312 <br />Project: ExxonMobil99CAS/022789C <br />Page 5 of 11 <br />Quality Control - Duplicate <br />Date Received: 06/08/12 <br />Work Order No: 12-06-0513 <br />Preparation: N/A <br />Method: EPA TO -3M <br />Date Date Duplicate Batch <br />Quality Control Sample ID Matrix Instrument Prepared: Analyzed: Number <br />72-06.0276-21 Air GC fie N/A 06/48/12 120608D01 <br />Parameter Sample Conc DUP Conc RPD RPD CL Qualifiers <br />TPH as Gasoline 28.30 28.55 1 0-20 <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 />