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Page 6 of 16 <br />U (science <br />" nvir'onmenfa! QL,ality Control - Spike/Spike Duplicate <br />Laaoratories, Inc. <br />Cardno ERI Date Received: 08/26/11 <br />601 North McDowell Blvd. Work Order No: 11-08-1796 <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 Matdx Instrument Prepared Analyzed Number <br />11-08-1935-1 Aqueous GC 24 08/30/11 08/30/11 110830501 <br />Parameter MS %REC MSD %REC <br />TPH as Gasoline 81 82 <br />RPD - Relative Percent Difference , CL - Control Limit <br />%REC CL RPD <br />68-122 <br />RPD CL qualifiers <br />0-18 <br />7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494 • FAX: (714) 894-7501 <br />