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Page 23 of 43 <br />&■r alscience <br />=_nvironmenta/ Quality Control - LCS/LCS Duplicate <br />Aw aboratories, Inc. <br />Cardno ERI Date Received: N/A <br />601 North McDowell Blvd. Work Order No: 11-05-1637 <br />Petaluma, CA 94954-2312 Preparation: EPA 3010A Total <br />Method: EPA 6010B <br />Project: ExxonMobil99CAS/022789C <br />Quality Control Sample ID <br />Matrix <br />Date <br />Instrument Prepared <br />Date <br />Analyzed <br />LCS/LCSD Batch <br />hlr+rnber <br />097-01.003-11,686 <br />Aqueous <br />ICP 5300 05/27/11 <br />05/27/11 <br />1105271A6 <br />Parameter <br />LCS %REC LCSD %REC <br />%REC CL RPD <br />RPD CL Qualifiers <br />Arsenic <br />97 <br />99 <br />80-120 <br />2 <br />0-20 <br />Cadmium <br />103 <br />104 <br />80-120 <br />1 <br />0-20 <br />Lead <br />106 <br />106 <br />80-120 <br />0 <br />0-20 <br />Selenium <br />95 <br />99 <br />80-120 <br />4 <br />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 />