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Page 55 of 79 <br /> alscience „y <br /> _nvironmental Quality Control - LCS/LCS Duplicate Q° <br /> AN aboratories, Inc. Q <br /> ne f <br /> GeoSyntec Consultants Date Received: N/A <br /> 475 14th Street, Suite 450 Work Order No: 08-08-0026 <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 /> 099-10-006-26,489 Aqueous GUMS 00 08/05/08 08/05/08 080805L02 <br /> Parameter LCS%REC LCSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 97 99 84-120 2 0-8 <br /> Carbon Tetrachloride 110 113 63-147 3 0-10 <br /> Chlorobenzene 92 94 89-119 2 0-7 <br /> 1,2-Dibromoethane 99 100 80-120 1 0-20 <br /> 1,2-Dichlorobenzene 90 93 89-119 3 0-9 <br /> 1,1-Dichloroethene 99 101 77-125 3 0-16 <br /> Ethylbenzene 92 95 80-120 3 0-20 <br /> Toluene 96 98 83-125 2 0-9 <br /> Trichloroethene 95 101 89-119 6 0-8 <br /> Vinyl Chloride 100 104 63-135 3 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 98 96 82-118 1 0-13 <br /> Tert-Butyl Alcohol(TBA) 103 113 46-154 9 0-32 <br /> Diisopropyl Ether(DIPE) 102 101 81-123 1 0-11 <br /> Ethyl-t-Butyl Ether(ETBE) 97 97 74-122 0 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 96 96 76-124 0 0-10 <br /> Ethanol 100 115 60-138 14 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 />