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Page 10 of 18 <br />G" alscience <br />Ac�nvironmental Quality Control - Spike/Spike Duplicate <br />L aborafories, Inc. <br />Cardno ERI Date Received: 09/01/11 <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 />Date Date MS/MSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br />11-09-0172-12 Solid GUMS XX 09/02/11 09/06/11 110906501 <br />Parameter <br />MS %REC MSD %REC %REC CL RPD RPD CL Qualifiers <br />Benzene <br />99 <br />101 <br />61-127 <br />1 <br />0-20 <br />Toluene <br />101 <br />102 <br />63-123 <br />1 <br />0-20 <br />Ethylbenzene <br />98 <br />101 <br />57-129 <br />2 <br />0-22 <br />Methyl -t -Butyl Ether (MTBE) <br />103 <br />99 <br />57-123 <br />4 <br />0-21 <br />Tert-Butyl Alcohol (TBA) <br />95 <br />97 <br />30-168 <br />2 <br />0-34 <br />Diisopropyl Ether (DIPE) <br />105 <br />103 <br />57-129 <br />2 <br />0-20 <br />Ethyl -t -Butyl Ether (ETBE) <br />103 <br />100 <br />55-127 <br />3 <br />0-20 <br />Tert-Amyl-Methyl Ether (TAME) <br />98 <br />97 <br />58-124 <br />1 <br />0-20 <br />Ethanol <br />83 <br />89 <br />17-167 <br />8 <br />0-47 <br />1,1-Dichloroethene <br />104 <br />101 <br />47-143 <br />3 <br />0-25 <br />1,2-Dibromoethane <br />104 <br />101 <br />64-124 <br />3 <br />0-20 <br />1,2 -Dichlorobenzene <br />94 <br />93 <br />35-131 <br />1 <br />0-25 <br />1,2-Dichloroethane <br />104 <br />103 <br />80-120 <br />1 <br />0-20 <br />Carbon Tetrachloride <br />94 <br />98 <br />51-135 <br />4 <br />0-29 <br />Chlorobenzene <br />97 <br />98 <br />57-123 <br />1 <br />0-20 <br />Trichloroethene <br />100 <br />102 <br />44-158 <br />3 <br />0-20 <br />Vinyl Chloride <br />110 <br />108 <br />49-139 <br />1 <br />0-47 <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 />