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Page 24 of 31 <br /> aiscience <br /> nvironmental Quality Control - LCS <br /> aboratories, Inc. <br /> Conestoga-Rovers&Associates Date Received: 05/22/14 <br /> 19449 Riverside Drive, Suite 230 Work Order: 14-05-1684 <br /> Sonoma, CA 95476-6955 Preparation: EPA 5030C <br /> Method: EPA 82608 <br /> Project: Cordes Ranch, Hansen Road,Tracy, CA Page 3 of 4 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed LCS Batch Number <br /> 099.12.796-8501 LCS Solid GC/MS Q 05/22/14 0512211414:28 140522L016 <br /> Parameter Spike Added Conc.Recovered LCS%Rec. ° Rec.CL Qualifiers <br /> Benzene 50.00 51.23 102 78-120 <br /> Ethylbenzene 50.00 51.23 102 76-120 <br /> Toluene 50.00 52.74 105 77-120 <br /> p1m-Xylene 100.0 105.2 105 75-125 <br /> o-Xylene 50.00 54.17 108 75-125 <br /> , <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 />