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Page 23 of 33 <br />alscien ce <br />nvironmental Quality Control - LCS/LCS Duplicate <br />. a/boraterles, Inc. <br />Cardno ERI Date Received: N/A <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 />Quallty Control Sample ID <br />Matrix <br />Instrument <br />Date <br />Prepared <br />Date <br />Analyzed <br />LCS/LCSD Batch <br />Number <br />097-01-003-12,603 <br />Aqueous <br />ICP 5300 <br />05/07/12 <br />05/08112 <br />120507LA5 <br />Parameter <br />SPIKE ADDED LCS %REC <br />LCSD %REC <br />%REC CL <br />RPD <br />RPD CL Qualifiers <br />Arsenic <br />0.5000 <br />105 <br />104 <br />80-120 <br />1 <br />0-20 <br />Cadmium <br />0.5000 <br />107 <br />106 <br />80-120 <br />1 <br />0-20 <br />Lead <br />0.5000 <br />111 <br />110 <br />80-120 <br />1 <br />0-20 <br />Selenium <br />0.5000 <br />103 <br />102 <br />80-120 <br />2 <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 />