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r , <br /> Page 32 of 40 <br /> aIscience <br /> nv/ronmenta/ Quality Control - LCS <br /> F. aboratories, Inc. <br /> Conestoga-Rovers&Associates Date Received: 07/17/13 <br /> 19449 Riverside Drive, Suite 230 Work Order: 13-07-1058 <br /> Sonoma, CA 95476-6955 Preparation: EPA 5030C <br /> Method: EPA 8260B <br /> Project: Cordes Ranch, Hansen Road, Tracy, CA Page 4 of 4 <br /> Quality Control Sample ID Matrix Instrument Date Analyzed LCS Batch Number <br /> 099-14.001.11435 Aqueous GC/MS XX 07/18/1310:44 130718L01 <br /> Parameter Spike Added Conc.Recovered LCS%Rec. %Rec.CL Qualifiers <br /> Benzene 50.00 46.47 93 80-120 <br /> Ethylbenzene 50.00 49.75 99 80-123 <br /> Toluene 50.00 47.69 95 79-121 <br /> p/m-Xylene 100.0 96.01 96 75-125 <br /> o-Xylene 50.00 46.76 94 75-125 <br /> U <br /> E <br /> 2 <br /> RPD:Relative Percent Difference. CL:Control Limits <br /> 7440 Lincoln Way,Garden Grove,CA 92841-1427 • TEL:(714)895-5494 • FAX:(714)894-7501 <br />