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Page 20 of 33 <br />alsdence <br />nvlronmental Quality Control - Spike/Spike Duplicate <br />aboratories, 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 8015B (M) <br />Project ExxonMobil99CAS/022789C <br />Date Date MS/MSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br />W-32-MW6 Aqueous GC 11 05110/12 05/10/12 120510501 <br />Parameter SPIKE ADDED MS %REC MSD %REC %REC CL RPD RPD CL Qualifiers <br />TPH as Gasoline 2000 87 86 68-122 1 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 />