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Page 12 of 15 <br /> 1science <br /> ,rte nvironmentai Quality Control - LCS/LCS Duplicate <br /> Aw aboratories, Inc. ' , <br /> KIff Analytical Date Received NIA <br /> 2795 2nd Street, Suite 300 Work Order No 05-09-0623 <br /> Davis, CA 95616-6593 Preparation EPA 624 <br /> Method EPA 624 <br /> Project Sanchez Property <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 097-07-002-501 Aqueous GC/MS U 09/13105 09/13/05 050913L01 <br /> Parameter LCS %REC LCSD%REC %REC Ct RPD RPD CL Qualifiers <br /> Benzene 95 95 85-115 1 0-8 <br /> Bromodichloromethane 103 102 73-121 1 0-9 <br /> Bromoform 106 105 80-134 1 0-10 <br /> Carbon Tetrachloride 97 97 83-925 0 0-10 <br /> Chlorobenzene 101 104 77-119 3 0-10 <br /> Chloroethane 83 82 81-129 1 0-9 <br /> Chloromethane 82 84 49-127 2 0-25 <br /> 2-Chloroethyl Vinyl Ether 96 82 6-144 16 0-94 <br /> Chloroform 98 96 84-120 2 0-8 <br /> 13-Dichlorobenzene 100 103 80-116 2 0-10 <br /> 14-Dichlorobenzene 101 104 80-116 3 0-10 <br /> 12-Dichlorobenzene 102 104 80-116 2 0-9 <br /> Dibromochloromethane 103 103 81-123 0 0-9 <br /> 11-Dichloroethane 97 96 83-119 1 0-8 <br /> 11-Dichloroethene 93 92 78-126 2 0-10 <br /> t-12-Dichloroethene 95 96 77-125 0 0-9 <br /> 12-Dichloropropane 99 100 84-120 1 0-9 <br /> c-1,3-Dtchloropropene 100 101 76-124 1 0-9 <br /> t-13-Dichioropropene 100 100 59-137 1 0-9 <br /> Ethylbenzene 104 107 77-119 3 0-10 <br /> Methylene Chloride 97 97 75-123 0 0-8 <br /> 1,1 2 2-Tetrachloroethane 102 102 84-120 0 0-9 <br /> Tetra chloroethene 99 102 73-139 3 0-15 <br /> Toluene 101 102 83-119 1 0-8 <br /> 111-Trichloroethane 97 96 83119 1 0-9 <br /> 112-Trichloroethane 99 101 81-117 2 0-8 <br /> Trichloroethene 98 98 85-115 0 0-8 <br /> Trichlorofluoromethane 87 86 85-139 1 0-9 <br /> Vinyl Chloride 80 82 69 129 3 0-11 <br /> o-Xylene 102 105 74-122 3 0-10 <br /> p/mAylene 100 104 75-123 3 0-11 <br /> Methyl-t-Butyl Ether(MTBE) 86 82 79-133 5 0-17 <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 />