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Page 14 of 18 <br />L;alscience <br />nvironmental Quality Control - LCS/LCS Duplicate <br />Labora#ories, Inc. <br />Cardno ERI Date Received: N/A <br />601 North McDowell Blvd. Work Order No: 11-09-0022 <br />Petaluma, CA 94954-2312 Preparation: EPA 5030C <br />Method: EPA 8260B <br />Project: ExxonMobil99CAS/022789C <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 />099-12-882-1,133 <br />Solid <br />GC/MS XX <br />09/06/11 <br />09/06/11 <br />1109061-03 <br />Parameter <br />LCS %REC <br />LCSD %REC <br />%REC CL <br />ME CL RPD <br />RPD CL Qualifiers <br />Benzene <br />89 <br />94 <br />78-120 <br />71-127 <br />5 <br />0-20 <br />Toluene <br />91 <br />96 <br />77-120 <br />70-127 <br />5 <br />0-20 <br />Ethylbenzene <br />89 <br />93 <br />76-120 <br />69-127 <br />4 <br />0-20 <br />Methyl -t -Butyl Ether (MTBE) <br />96 <br />102 <br />77-120 <br />70-127 <br />6 <br />0-20 <br />Tert-Butyl Alcohol (TBA) <br />79 <br />83 <br />68-122 <br />59-131 <br />5 <br />0-20 <br />Diisopropyl Ether (DIPE) <br />95 <br />100 <br />78-120 <br />71-127 <br />5 <br />0-20 <br />Ethyl -t -Butyl Ether (ETBE) <br />94 <br />100 <br />78-120 <br />71-127 <br />6 <br />0-20 <br />Tert-Amyl-Methyl Ether (TAME) <br />90 <br />96 <br />75-120 <br />68-128 <br />7 <br />0-20 <br />Ethanol <br />76 <br />78 <br />56-140 <br />42-154 <br />2 <br />0-20 <br />1,1-Dichloroethene <br />94 <br />100 <br />74-122 <br />66-130 <br />6 <br />0-20 <br />1,2-Dibromoethane <br />93 <br />97 <br />80-120 <br />73-127 <br />5 <br />0-20 <br />1,2 -Dichlorobenzene <br />1,2-Dichloroethane <br />91 <br />93 <br />95 <br />98 <br />75-120 <br />80-120 <br />68-128 <br />73-127 <br />4 <br />5 <br />0-20 <br />0-20 <br />Carbon Tetrachloride <br />89 <br />94 <br />49-139 <br />34-154 <br />6 <br />0-20 <br />Chlorobenzene <br />88 <br />92 <br />79-120 <br />72-127 <br />5 <br />0-20 <br />Trichloroethene <br />90 <br />95 <br />80-120 <br />73-127 <br />5 <br />0-20 <br />Vinyl Chloride <br />110 <br />113 <br />68-122 <br />59-131 <br />2 <br />0-20 <br />0 <br />Total number of LCS compounds : 17 <br />x <br />Total number of ME compounds : 0 <br />Total number of ME compounds allowed : <br />1 <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 />