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Page 18 of 33 <br />alsdence <br />A nvironmentai Quality Control - PDS / PDSD <br />aboratories, Inc. <br />Cardno ERI Date Received 05/05/12 <br />601 North McDowell Blvd. Work Order No: 12-05-0453 <br />Petaluma, CA 94954-2312 Preparation: EPA 3010A Total <br />Method: EPA 6010B <br />Project: ExxonMobil99CAS/022789C <br />Date Date Analyzed PDS / PDSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Number <br />12-05-0428-1 Aqueous ICP 5300 05/07112 05108/12 120507SA5 <br />Parameter <br />SPIKE ADDED <br />PDS %REC <br />PDSD %REC <br />%REC CL <br />RPD <br />RPD CL Qualifiers <br />Arsenic <br />0.5000 <br />101 <br />99 <br />75-125 <br />2 <br />0-11 <br />Cadmium <br />0.5000 <br />100 <br />100 <br />75-125 <br />0 <br />0-7 <br />Lead <br />0.5000 <br />104 <br />102 <br />75-125 <br />2 <br />0-7 <br />Selenium <br />05000 <br />107 <br />105 <br />75-125 <br />2 <br />0-9 <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 />