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Page 43 of 79 <br /> alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> "� <br /> aboratories, Inc. Q <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 /> 08-08-0180-1 Aqueous GUMS 00 08/06/08 08/06/08 080806S01 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 94 91 88-118 3 0-7 <br /> Carbon Tetrachloride 108 107 67-145 1 0-11 <br /> Chlorobenzene 89 89 88-118 0 0-7 <br /> 1,2-Dibromoethane 94 95 70-130 2 0-30 <br /> 1,2-Dichlorobenzene 87 90 86-116 4 0-8 <br /> 1,1-Dichloroethene 86 68 70-130 14 0-25 3 <br /> Ethylbenzene 91 89 70-130 1 0-30 <br /> Toluene 93 92 87-123 2 0-8 <br /> Trichloroethene 91 91 79-127 1 0-10 <br /> Vinyl Chloride 94 97 69-129 3 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 96 96 71-131 0 0-13 <br /> Tert-Butyl Alcohol(TBA) 98 93 36-168 6 0-45 <br /> Diisopropyl Ether(DIPE) 100 100 81-123 1 0-9 <br /> Ethyl-t-Butyl Ether(ETBE) 94 96 72-126 2 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 94 95 72-126 1 0-12 <br /> Ethanol 102 95 53-149 7 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 />