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Page 10 of 22 <br />Calscience <br />Environmental Quality Control - Spike/Spike Duplicate <br />Laboratories, Inc. <br />Cardno ERI Date Received: 09/28/11 <br />601 North McDowell Blvd. Work Order No: 11-09-1799 <br />Petaluma, CA 94954-2312 Preparation: EPA 3050B <br />Method: EPA 6010B <br />Project ExxonMobil99CAS/022789C <br />Date Date MS/MSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br />11-09-1787-49 Solid ICP 5300 09/29/11 10/01/11 110929502 <br />Parameter SPIKE ADDED MS %REC MSD %REC %REC CL RPD RPD CL Qualifiers <br />Lead 25.00 100 105 75-125 3 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 />