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Page 16 of 22 <br />alscience <br />;Environmental Quality Control - LCS/LCS Duplicate <br />Laboratories, Inc. <br />Cardno ERI Date Received: N/A <br />601 North McDowell Blvd. Work Order No: 11-09-1799 <br />Petaluma, CA 94954-2312 Preparation: EPA 5030C <br />Method: EPA 8015B (M) <br />Project: ExxonMobil99CAS/022789C <br />Date Date LCS/LCSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br />099-12-279-4,734 Solid GC 22 09/29/11 09/29/11 110929B02 <br />Parameter SPIKE ADDED LCS %REC LCSD %REC %REC CL RPD RPD CL Qualiflers <br />TPH as Gasoline 10.00 91 91 70-124 0 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 />