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Page 14 of 20 <br />G. alscience <br />nvironmental Quality Control - LCS/LCS Duplicate <br />Laboratories, Inc. <br />Cardno ERI Date Received: N/A <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 />Quality Control Sample ID <br />Date <br />Matrix Instrument Prepared <br />Date <br />Analyzed <br />LCS/LCSD Batch <br />Humber <br />099-12-279-4,729 <br />Solid GC 22 09/28/11 <br />09/29/11 <br />1109281302 <br />Parameter <br />SPIKE ADDED LCS %REC LCSD %REC <br />%REC CL RPD <br />RPD CL Qualifiers <br />TPH as Gasoline <br />10.00 88 87 <br />70-124 1 <br />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 />