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Page 31 of 45 <br /> alscience 0A , <br /> l; <br /> _nvironmental Quality Control - LCS/LCS Duplicate e <br /> _ � nelf <br /> aboratories, Inc. Q <br /> GeoSyntec Consultants Date Received: N/A <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 /> Project: W FS - Stockton <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 099-10-006-26,452 Aqueous GUMS 00 07/31/08 07/31/08 080731L02 <br /> Parameter LCS%REC LCSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 104 107 84-120 3 0-8 <br /> Carbon Tetrachloride 109 117 63-147 7 0-10 <br /> Chlorobenzene 106 108 89-119 2 0-7 <br /> 1,2-Dibromoethane 102 103 80-120 1 0-20 <br /> 1,2-Dichlorobenzene 101 104 89-119 3 0-9 <br /> 1,1-Dichloroethene 113 120 77-125 6 0-16 <br /> Ethylbenzene 105 109 80-120 4 0-20 <br /> Toluene 105 108 83-125 3 0-9 <br /> Trichloroethene 111 113 89-119 2 0-8 <br /> Vinyl Chloride 104 109 63-135 5 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 98 100 82-118 2 0-13 <br /> Tert-Butyl Alcohol(TBA) 100 112 46-154 11 0-32 <br /> Diisopropyl Ether(DIPE) 106 108 81-123 2 0-11 <br /> Ethyl-t-Butyl Ether(ETBE) 96 99 74-122 3 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 93 95 76-124 2 0-10 <br /> Ethanol 115 117 60-138 2 0-32 <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 />