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Page 14 of 28 <br /> Calscience <br /> Anvironmental Quality Control - Spike/Spike Duplicate <br /> L aboratories, Inc. <br /> Cardno ERI Date Received: 09/24/11 <br /> 601 North McDowell Blvd. Work Order No: 11-09-1646 <br /> Petaluma, CA 94954-2312 Preparation: EPA 3010A Total <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 /> 11-09-1570-21 Aqueous ICP 5300 09/26/11 09/27/11 110926SA6 <br /> Parameter SPIKE ADDED MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Arsenic 0.5000 95 93 80-140 2 0-11 <br /> Cadmium 0.5000 86 84 82-124 2 0-7 <br /> Lead 0.5000 87 85 84-120 2 0-7 <br /> Selenium 0.5000 70 69 79-127 1 0-9 HX <br /> U <br /> 7 <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 />