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Page 20 of 31 <br /> alscience <br /> nvironmenta/ Quality Control - Spike/Spike Duplicate <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 2 of 3 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed MS/MSD Batch Number <br /> 14-05-1702-1 Sample Solid GC/MS Q 05/22/14 05/22/1418:32 1405225004 <br /> 14-05-1702-1 Matrix Spike Solid GC/MS Q 05/22/14 05/22/1418:59 140522S004 <br /> 14.05.1702.1 Matrix Spike Duplicate Solid GC/MS Q 05/22114 05/22/1419:25 1405225004 <br /> Parameter Sample S2& MS MS MSD MSD %Rec.CL RPD RPD Qualifiers <br /> Conc. Added Conc. %Rea Cana %ReEL <br /> Benzene ND 50.00 28.81 58 31.21 62 61-127 8 0-20 3 <br /> Ethylbenzene ND 50.00 28.48 57 28.40 57 57-129 0 0-22 <br /> Toluene ND 50.00 29.45 59 30.85 62 63-123 5 0-20 3 <br /> p/m-Xylene ND 100.0 48.12 48 45.76 46 70-130 5 0-30 3 <br /> o-Xylene ND 50.00 38.34 77 39.59 79 70-130 3 0-30 <br /> v <br /> r` <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 />