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Page 24 of 45 <br /> alscience N A C C 09 <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> AN aboratories, Inc. <br /> nel <br /> GeoSyntec Consultants Date Received: 07/31/08 <br /> 475 14th Street, Suite 450 Work Order No: 08-07-2668 <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 /> 08-07-2416-9 Aqueous GUMS 00 07/31/08 08/01/08 080731S02 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 97 99 88-118 2 0-7 <br /> Carbon Tetrachloride 98 105 67-145 7 0-11 <br /> Chlorobenzene 98 100 88-118 3 0-7 <br /> 1,2-Dibromoethane 98 102 70-130 4 0-30 <br /> 1,2-Dichlorobenzene 92 96 86-116 4 0-8 <br /> 1,1-Dichloroethene 103 107 70-130 4 0-25 <br /> Ethylbenzene 95 96 70-130 1 0-30 <br /> Toluene 97 100 87-123 3 0-8 <br /> Trichloroethene 95 98 79-127 3 0-10 <br /> Vinyl Chloride 92 98 69-129 7 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 102 108 71-131 5 0-13 <br /> Tert-Butyl Alcohol(TBA) 94 100 36-168 6 0-45 <br /> Diisopropyl Ether(DIPE) 107 110 81-123 3 0-9 <br /> Ethyl-t-Butyl Ether(ETBE) 98 102 72-126 3 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 95 97 72-126 2 0-12 <br /> Ethanol 102 103 53-149 1 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 />