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Caiscience <br />;environmental Quality Control - LCS/LCS Duplicate <br />Laboratories, Inc. <br />Cardno ERI <br />601 North McDowell Blvd. <br />Petaluma, CA 94954-2312 <br />Project: ExxonMobil99CAS/022789C <br />Page 14 of 22 <br />Date Received: N/A <br />Work Order No: 11-09-1799 <br />Preparation: EPA 3050B <br />Method: EPA 6010B <br />Date Date LCS/LCSD Batch <br />Quality Control Sample 10 Matrix Instrument Prepared Analyzed Number <br />097-01-002-15,282 Solid ICP 5300 09/29/11 10/03/11 1109291-02 <br />Parameter SPIKE ADDED LCS %REC LCSD %REC %REC CL RPD RPD CL Qualifiers <br />Lead 25.00 99 107 80-120 7 0-20 <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 />