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Page 22 of 35 <br /> alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> "� <br /> aboratories, Inc. <br /> n e <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 /> 08-05-1698-1 Aqueous GC/MS U 05/28/08 05/28/08 080528S01 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 99 95 88-118 5 0-7 <br /> Carbon Tetrachloride 109 98 67-145 10 0-11 <br /> Chlorobenzene 103 99 88-118 3 0-7 <br /> 1,2-Dibromoethane 108 99 70-130 9 0-30 <br /> 1,2-Dichlorobenzene 101 98 86-116 3 0-8 <br /> 1,1-Dichloroethene 101 89 70-130 12 0-25 <br /> Ethylbenzene 106 103 70-130 3 0-30 <br /> Toluene 101 101 87-123 0 0-8 <br /> Trichloroethene 101 97 79-127 4 0-10 <br /> Vinyl Chloride 98 97 69-129 2 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 105 95 71-131 9 0-13 <br /> Tert-Butyl Alcohol(TBA) 117 107 36-168 9 0-45 <br /> Diisopropyl Ether(DIPE) 105 95 81-123 10 0-9 4 <br /> Ethyl-t-Butyl Ether(ETBE) 102 94 72-126 8 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 102 98 72-126 4 0-12 <br /> Ethanol 116 108 53-149 8 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 />