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Page 42 of 79 <br /> alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> "� <br /> aboratories, Inc. <br /> n e <br /> GeoSyntec Consultants Date Received: 08/01/08 <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 /> Proiect WFS - Stockton <br /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> MW-2 Aqueous GUMS 00 08/05/08 08/06/08 080805S02 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 90 89 88-118 1 0-7 <br /> Carbon Tetrachloride 102 103 67-145 0 0-11 <br /> Chlorobenzene 89 86 88-118 3 0-7 3 <br /> 1,2-Dibromoethane 95 95 70-130 0 0-30 <br /> 1,2-Dichlorobenzene 83 88 86-116 5 0-8 3 <br /> 1,1-Dichloroethene 90 87 70-130 3 0-25 <br /> Ethylbenzene 86 85 70-130 1 0-30 <br /> Toluene 89 88 87-123 2 0-8 <br /> Trichloroethene 85 84 79-127 2 0-10 <br /> Vinyl Chloride 89 91 69-129 3 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 96 96 71-131 0 0-13 <br /> Tert-Butyl Alcohol(TBA) 91 94 36-168 3 0-45 <br /> Diisopropyl Ether(DIPE) 99 97 81-123 1 0-9 <br /> Ethyl-t-Butyl Ether(ETBE) 96 94 72-126 2 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 94 94 72-126 0 0-12 <br /> Ethanol 96 99 53-149 4 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 />