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Page 16 of 28 <br /> Calscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> Laboratories, Inc. <br /> Cardno ERI Date Received: 09/24/11 <br /> 601 North McDowell Blvd. Work Order No: 11-09-1646 <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 /> 11-09-1570-21 Aqueous GC 18 09/26/11 09/26/11 110926501 <br /> Parameter SPIKE ADDED MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> TPH as Gasoline 2000 103 99 68-122 3 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 />