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Page 6 of 16 <br />CA.Science <br />nvironmental Quality Control - Spike/Spike Duplicate <br />Laboratories, Inc. <br />Cardno ERI Date Received: 09/23/11 <br />601 North McDowell Blvd. Work Order No: 11-09-1579 <br />Petaluma, CA 94954-2312 Preparation: EPA 5030C <br />Method: EPA 8015B (M) <br />Project ExxonMobil99CAS/022789C <br />Date Date MS/MSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br />11-09-1820-1 Aqueous GC 22 09/28/11 09/28/11 110928501 <br />Parameter SPIKE ADDED MS %REC MSD %REC %REC CL RPD RPD CL Qualifiers <br />TPH as Gasoline 2000 93 93 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 />