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Page 6 of 14 <br />alscience <br />G <br />Cnvironmental Quality Control - Spike/Spike Duplicate <br />L aboratories, Inc. <br />Cardno ERI <br />Date Received: <br />09/01/11 <br />601 North McDowell Blvd. <br />Work Order No: <br />11-09-0023 <br />Petaluma, CA 94954-2312 <br />Preparation: <br />EPA 5030C <br />Method: <br />EPA 8015B (M) <br />Project ExxonMobil99CAS/022789C <br />Date <br />Date MS/MSD Batch <br />Quality Control Sample ID <br />Matrix Instrument Prepared <br />Analyzed Number <br />11-08-2047-5 <br />Aqueous GC 18 09/01/11 <br />09/02/11 110901502 <br />Parameter MS %REC MSD %REC %REC CL RPD RPD CL Qualifiers <br />TPH as Gasoline 81 81 68-122 0 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 />