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Page 10 of 16 <br />Calscience <br />&nvironmental Quality Control - LCS/LCS Duplicate <br />L aboratories, Inc. <br />Cardno ERI Date Received: N/A <br />601 North McDowell Blvd. Work Order No: 11-09-1579 <br />Petaluma, CA 94954-2312 Preparation: EPA 5030C <br />Method: EPA 8260B <br />Project: ExxonMobil99CAS/022789C <br />Tert-Butyl Alcohol (TBA) <br />50.00 <br />91 <br />Date <br />Date <br />LCS/LCSD Batch <br />Quality Control Sample ID <br />Matrix <br />Instrument <br />Prepared <br />Analyzed <br />101 <br />Number <br />099-12-884-701 <br />Aqueous <br />GC/MS BB <br />09/29/11 <br />09/29/11 <br />98 <br />1109291-02 <br />Parameter <br />SPIKE ADDED LCS %REC LCSD %REC <br />%REC CL ME CL <br />RPD <br />RPD CL Qualifiers <br />Benzene <br />10.00 <br />116 <br />115 <br />80-120 73-127 <br />1 <br />0-20 <br />Toluene <br />10.00 <br />119 <br />121 <br />80-120 73-127 <br />2 <br />0-20 LQ,RU <br />Ethylbenzene <br />10.00 <br />113 <br />114 <br />80-120 73-127 <br />0 <br />0-20 <br />Methyl -t -Butyl Ether (MTBE) <br />10.00 <br />98 <br />100 <br />69-123 60-132 <br />2 <br />0-20 <br />Tert-Butyl Alcohol (TBA) <br />50.00 <br />91 <br />83 <br />63-123 <br />53-133 <br />10 <br />0-20 <br />Diisopropyl Ether (DIPE) <br />10.00 <br />99 <br />101 <br />59-137 <br />46-150 <br />3 <br />0-37 <br />Ethyl -t -Butyl Ether (ETBE) <br />10.00 <br />98 <br />97 <br />69-123 <br />60-132 <br />1 <br />0-20 <br />Tert-Amyl-Methyl Ether (TAME) <br />10-00 <br />107 <br />109 <br />70-120 <br />62-128 <br />2 <br />0-20 <br />Ethanol <br />100.0 <br />100 <br />91 <br />28-160 <br />6-182 <br />9 <br />0-57 <br />1,2-Dibromoethane <br />10.00 <br />108 <br />108 <br />79-121 <br />72-128 <br />0 <br />0-20 <br />1,2-Dichloroethane <br />10.00 <br />117 <br />119 <br />80-120 <br />73-127 <br />1 <br />0-20 <br />Total number of LCS compounds : 11 <br />Total number of ME compounds : 1 <br />Total number of ME compounds allowed <br />LCS ME CL validation result: Pass <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 />