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Page 17 of 33 <br />F alsdence <br />nvironmental Quality Control - Spike/Spike Duplicate <br />aboratoriea 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 />Proiect ExxonMobil99CAS/022789C <br />Date Date MS/MSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br />12-05-0428-1 Aqueous ICP 5300 05/07/12 05/08/12 120507SA5 <br />Parameter <br />SPIKE ADDED <br />MS %REC <br />MSD %REC <br />%REC CL <br />RPD <br />RPD CL Qualifiers <br />Arsenic <br />0.5000 <br />102 <br />101 <br />80-140 <br />1 <br />0-11 <br />Cadmium <br />0.5000 <br />101 <br />102 <br />82-124 <br />1 <br />0-7 <br />Lead <br />0.5000 <br />104 <br />105 <br />84-120 <br />0 <br />0-7 <br />Selenium <br />0.5000 <br />108 <br />108 <br />79-127 <br />0 <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 />