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Page 19 of 36 <br /> �alscience <br /> nvironmental Quality Control - PDS / PDSD ` <br /> i� aboratories, Inc. <br /> Cardno ERI Date Received 03/17/12 <br /> 601 North McDowell Blvd. Work Order No: 12-03-1242 <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 Matrw Instrument Prepared Number <br /> W-32-~ Aqueous ICP 5300 03/19/12 03/20112 120319SAS <br /> Parameter SPIKE ADDED PDS%REC PDSD%REC %REC CL RPD RPD C Qualifiers <br /> Arsenic 0.5000 98 98 75-125 0 0-11 <br /> Cadmium 0.5000 102 103 75-125 1 0-7 <br /> Lead 0.5000 103 104 75-125 1 0-7 <br /> Selenium 0.5000 108 108 75-125 0 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 />