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Page 26 of 43 <br />!!science <br />mw_nvironmental Quality Control - LCS/LCS Duplicate <br />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 5030C <br />Method: EPA 8260B <br />Project: ExxonMobil99CAS/022789C <br />Total number of LCS compounds : 11 <br />Total number of ME compounds : 1 <br />Total number of ME compounds allowed : 1 <br />LCS ME CL validation result : Pass <br />Ethyl -t -Butyl Ether (ETBE): The percent recovery is above acceptable control limits. The samples and method blank associated with this batch are <br />non -detect and, therefore, the results have been reported without further clarification. <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 />Date <br />Date <br />LCS/LCSD Batch <br />Quality Control Sample ID <br />Matrix <br />Instrument <br />Prepared <br />Analyzed <br />Number <br />099-12-884605 <br />Aqueous <br />GC/MS L <br />05/26/11 <br />05/27111 <br />11052611-02 <br />Parameter <br />LCS %REC <br />LCSD %REQ <br />%REC CL <br />ME CL RPD <br />RPD CL Qualifiers <br />Benzene <br />112 <br />116 <br />80-120 <br />73-127 <br />3 <br />0-20 <br />Toluene <br />105 <br />109 <br />80-120 <br />73-127 <br />4 <br />0-20 <br />Ethylbenzene <br />107 <br />109 <br />80-120 <br />73-127 <br />2 <br />0-20 <br />Methyl -t -Butyl Ether (MTBE) <br />120 <br />120 <br />69-123 <br />60-132 <br />0 <br />0-20 <br />Tert-Butyl Alcohol (TBA) <br />97 <br />103 <br />63-123 <br />53-133 <br />6 <br />0-20 <br />Diisopropyl Ether (DIPE) <br />134 <br />126 <br />59-137 <br />46-150 <br />6 <br />0-37 <br />Ethyl -t -Butyl Ether (ETBE) <br />124 <br />127 <br />69-123 <br />60-132 <br />3 <br />0-20 ME <br />Tert-Amyl-Methyl Ether (TAME) <br />106 <br />106 <br />70-120 <br />62-128 <br />0 <br />0-20 <br />Ethanol <br />107 <br />107 <br />28-160 <br />6-182 <br />0 <br />0-57 <br />1,2-Dibromoethane <br />107 <br />107 <br />79-121 <br />72-128 <br />1 <br />0-20 <br />1,2-Dichloroethane <br />113 <br />114 <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 : 1 <br />LCS ME CL validation result : Pass <br />Ethyl -t -Butyl Ether (ETBE): The percent recovery is above acceptable control limits. The samples and method blank associated with this batch are <br />non -detect and, therefore, the results have been reported without further clarification. <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 />