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Page 11 of 20 <br />alscience <br />9-flvironmental Quality Control - Spike/Spike Duplicate <br />Laboratories, Inc. <br />Cardno ERI Date Received: 09/28/11 <br />601 North McDowell Blvd. Work Order No: 11-09-1798 <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 />5-20-AS2 Solid GC 22 09/28/11 09/29/11 110928502 <br />Parameter SPIKE ADDED MS %REC MSD %REC %REC CL RPD RPD CL Qualifiers <br />TPH as Gasoline 10.00 87 88 48-114 1 0-23 <br />t <br />0 <br />o <br />0 <br />m <br />7 <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 />