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Page 11 of 14 <br /> !!science <br /> ilvironmenta/ Quality Control - LCS/LCS Duplicate <br /> aboratories, Inc. <br /> L Stantec Date Received: N/A <br /> 57 Lafayette Circle, 2nd Floor Work Order No: 08-05-2477 <br /> Lafayette, CA 94549-4321 Preparation: EPA 5030B <br /> Method: EPA 8260B <br /> Project: PG&E French Camp/ 050T.50351.02 <br /> r Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 099-10-006-25,814 Aqueous GC/MS QQ , 06/02/08 06/03/08 080602LA3 <br /> Parameter LCS%REC LCSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 97 96 84-120 0 0-8 <br /> Carbon Tetrachloride 102 106 63-147 4 0-10 <br /> Chlorobenzene 97 99 89-119 2 0-7 <br /> 1,2-Dibromoethane 100 99 80-120 1 0-20 <br /> 1,2-Dichlorobenzene 99 99 89-119 0 0-9 <br /> 1,1-Dichloroethene 101 103 77-125 3 0-16 <br /> Ethylbenzene 93 96 80-120 3 0-20 <br /> Toluene 98 98 83-125 0 0-9 <br /> Trichloroethene 101 103 89-119 1 0-8 <br /> Vinyl Chloride 91 92 63-135 1 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 103 102 82-118 1 0-13 <br /> Tert-Butyl Alcohol(TBA) 91 88 46-154 3 0-32 <br /> L Diisopropyl Ether(DIPS) 98 99 81-123 0 0-11 <br /> Ethyl-t-Butyl Ether(ETBE) 100 100 74-122 0 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 102 101 76-124 1 0-10 <br /> Ethanol 94 90 60-138 4 0-32 <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 />