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alscience <br />Aw_nvironmental <br />aboratories, Inc. <br />Cardno ERI <br />601 North McDowell Blvd. <br />Petaluma, CA 94954-2312 <br />Quality Control - LCS/LCS Duplicate <br />Project: ExxonMobil99CAS/022789C <br />Page 28 of 43 <br />Date Received: N/A <br />Work Order No: 11-05-1637 <br />Preparation: EPA 5030C <br />Method: EPA 8260B <br />Date Date LCS/LCSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br />099-12-884606 Aqueous GC/MS FFF 05/27111 05127/11 110527L01 <br />Parameter LCS %REC LCSD %REC %REC CL ME CL RPD RPD CL Qualifiers <br />Benzene <br />97 <br />102 <br />80-120 <br />73-127 <br />5 <br />0-20 <br />Toluene <br />97 <br />102 <br />80-120 <br />73-127 <br />4 <br />0-20 <br />Ethylbenzene <br />96 <br />102 <br />80-120 <br />73-127 <br />6 <br />0-20 <br />Methyl -t -Butyl Ether (MTBE) <br />96 <br />101 <br />69-123 <br />60-132 <br />5 <br />0-20 <br />Tert-Butyl Alcohol (TBA) <br />96 <br />99 <br />63-123 <br />53-133 <br />3 <br />0-20 <br />Diisopropyl Ether (DI PE) <br />98 <br />102 <br />59-137 <br />46-150 <br />4 <br />0-37 <br />Ethyl -t -Butyl Ether (ETBE) <br />98 <br />102 <br />69-123 <br />60-132 <br />4 <br />0-20 <br />Tert-Amyl-Methyl Ether (TAME) <br />98 <br />103 <br />70-120 <br />62-128 <br />5 <br />0-20 <br />Ethanol <br />100 <br />106 <br />28-160 <br />6-182 <br />5 <br />0-57 <br />1,2-Dibromoethane <br />95 <br />102 <br />79-121 <br />72-128 <br />8 <br />0-20 <br />1,2-Dichloroethane <br />97 <br />102 <br />80-120 <br />73-127 <br />5 <br />0-20 <br />Total number of LCS compounds: 11 <br />Total number of ME compounds : 0 <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 />