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Page 21 of 31 <br /> alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> ahoratories,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 8260B <br /> Project: Cordes Ranch, Hansen Road,Tracy, CA Page 3 of 3 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed MSIMSD Batch Number <br /> 14-05-1808.1 Sample Solid GC/MS Q 05123114 0512311415:05 1405235017 <br /> 14-05.1808-1 Matrix Spike Solid GC/MS Q 05123/14 05123/1416:24 1405235017 <br /> 14.05-1808-1 Matrix Spike Duplicate Solid GCIMS Q 05/23/14 05123/14 16:50 1405235017 <br /> Parameter Samole Soike MS MS MSD MSD %Rec.CL RPD RPD CL Qualifiers <br /> Conc. Added Conc. ° Rec. Conc. ° Rec. <br /> Benzene ND 50.00 46.13 92 43.79 88 61-127 5 0-20 <br /> Elhylbenzene ND 50.00 46.19 92 44.63 89 57-129 3 0-22 <br /> Toluene ND 50.00 47.81 96 45.16 90 63-123 6 0-20 <br /> p/m-Xylene No 100.0 92.89 93 90.27 90 70-130 3 0-30 <br /> o-Xylene ND 50.00 47.79 96 46.70 93 70-130 2 0-30 <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 />