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Page 12 of 27 <br />C.L'Science <br />&nvironmental Quality Control - Spike/Spike Duplicate <br />AIF aboratories, Inc. <br />Cardno ERI <br />Date Received: <br />09/23/11 <br />601 North McDowell Blvd. <br />Work Order No: <br />11-09-1580 <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 Matrix <br />Instrument Prepared <br />Analyzed Number <br />11-09-1571-3 Solid <br />GC 42 09/23/11 <br />09/23/11 110923501 <br />Parameter SPIKE ADDED MS %REC MSD %REC %REC CL RPD RPD CL Qualifiers <br />TPH as Gasoline 1000 66 70 48-114 5 0-23 <br />RPD -Relative Percent Difference . CL - Control Limit <br />h" <br />7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494 • FAX: (714) 894-7501 <br />