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Page 7 of 14 <br /> &; <br /> em <br /> alscience <br /> L� <br /> j�vironmental Quality Control - Spike/Spike Duplicate <br /> Al. aboratories, Inc. <br /> Stantec Date Received: 05/29/08 <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 /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> MW3 - Aqueous GC/IVIS QQ 06/02/08 06/03/08 080602502 <br /> Parameter MS°kREC MSD%REC °kREC CL RPD RPD CL Qualifiers <br /> f Benzene 97 98 88-118 1 0-7 <br /> Carbon Tetrachloride 105 102 67-145 2 0-11 <br /> kr Chlorobenzene 96 95 88-118 0 0-7 <br /> 1,2-Dibromoethane 103 102 70-130 1 0-30 <br /> 1,2-Dichlorobenzene 95 96 86.116 1 0-8 <br /> 1,1-Dichloroethene 107 107 70-130 0 0-25 <br /> Ethylbenzene 92 91 70-130 1 0-30 <br /> Toluene 96 97 87-123 1 0-8 <br /> Trichloroethene 95 96 79-127 1 0-10 <br /> Vinyl Chloride 98 98 69-129 0 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 105 104 71-131 1 0-13 <br /> Tert-Butyl Alcohol(TBA) 100 101 36-168 1 0-45 <br /> Diisopropyl Ether(DIPE) 101 100 81-123 1 0-9 <br /> Ethyl-t-Butyl Ether(ETRE) 100 100 72-126 0 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 101 102 72-126 1 0-12 <br /> Ethanol 111 110 53-149 1 0-31 <br /> i <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 />