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Page 30 of 35 <br /> alscience „ <br /> _nvironmental Quality Control - LCS/LCS Duplicate Q°ne <br /> F=F aboratories, Inc. Q <br /> f <br /> GeoSyntec Consultants Date Received: N/A <br /> 475 14th Street, Suite 450 Work Order No: 08-05-1902 <br /> Oakland, CA 94612-1940 Preparation: EPA 50308 <br /> Method: EPA 82608 <br /> Project: W FS - Stockton <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 099-10-006-25,734 Aqueous GUMS U 05/28/08 05/28/08 080528L01 <br /> Parameter LCS%REC LCSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 96 96 84-120 0 0-8 <br /> Carbon Tetrachloride 104 106 63-147 3 0-10 <br /> Chlorobenzene 100 99 89-119 1 0-7 <br /> 1,2-Dibromoethane 103 103 80-120 0 0-20 <br /> 1,2-Dichlorobenzene 100 100 89-119 0 0-9 <br /> 1,1-Dichloroethene 97 96 77-125 1 0-16 <br /> Ethylbenzene 103 102 80-120 1 0-20 <br /> Toluene 98 97 83-125 1 0-9 <br /> Trichloroethene 99 98 89-119 1 0-8 <br /> Vinyl Chloride 98 99 63-135 1 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 100 100 82-118 0 0-13 <br /> Tert-Butyl Alcohol(TBA) 100 102 46-154 2 0-32 <br /> Diisopropyl Ether(DIPE) 100 101 81-123 1 0-11 <br /> Ethyl-t-Butyl Ether(ETBE) 98 100 74-122 2 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 99 99 76-124 0 0-10 <br /> Ethanol 102 102 60-138 0 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 />