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Page 21 of 35 <br /> alscience �o ; yo; <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> aboratories, Inc. <br /> ne <br /> GeoSyntec Consultants Date Received: 05/21/08 <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 /> Proiect WFS - Stockton <br /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 08-05-1660-1 Aqueous GC/MS U 05/24/08 05/24/08 080524S01 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 102 103 88-118 0 0-7 <br /> Carbon Tetrachloride 107 106 67-145 1 0-11 <br /> Chlorobenzene 103 104 88-118 0 0-7 <br /> 1,2-Dibromoethane 114 117 70-130 2 0-30 <br /> 1,2-Dichlorobenzene 103 103 86-116 0 0-8 <br /> 1,1-Dichloroethene 101 102 70-130 1 0-25 <br /> Ethylbenzene 106 105 70-130 0 0-30 <br /> Toluene 104 104 87-123 0 0-8 <br /> Trichloroethene 102 104 79-127 2 0-10 <br /> Vinyl Chloride 105 105 69-129 0 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 106 107 71-131 0 0-13 <br /> Tert-Butyl Alcohol(TBA) 134 143 36-168 6 0-45 <br /> Diisopropyl Ether(DIPE) 108 109 81-123 1 0-9 <br /> Ethyl-t-Butyl Ether(ETBE) 110 111 72-126 1 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 109 110 72-126 1 0-12 <br /> Ethanol 117 125 53-149 6 0-31 <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 />