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Page 19 of 33 <br />4, alscience <br />—nvironmental Quality Control -Spike/Spike Duplicate <br />aaboratories, Inc. <br />Cardno ERI Date Received: 05/05/12 <br />601 North McDowell Blvd. Work Order No: 12-05-0453 <br />Petaluma, CA 94954-2312 Preparation: EPA 5030C <br />Method: EPA 80158 (M) <br />Project ExxonMobil99CAS/022789C <br />Date Date MS/MSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br />W-32-MW1 Aqueous GC 11 05/08/12 05/08112 120508501 <br />Parameter SPIKE ADDED MS %REC MSD %REC %REC CL RPD RPD CL Qualifiers <br />TPH as Gasoline 2000 83 81 68-122 2 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 />