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Page 9 of 19 <br /> ti•} eurofins Quality Control - Spike/Spike Duplicate <br /> Calscience <br /> Conestoga-Rovers&Associates Date Received: 06/28/14 <br /> 19449 Riverside Drive,Suite 230 Work Order: 14-06-2155 <br /> Sonoma, CA 95476-6955 Preparation: EPA 5030C <br /> Method: EPA 8260B <br /> Project: Cordes Ranch, Hansen Road, Tracy, CA Page 1 of 2 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed MS/MSD Batch Number <br /> [14-06-2147-2 <br /> -06-2147-2 Sample Aqueous GC/MS Z 06/30/14 06/30/1414:13 1406305005 <br /> Matrix Spike Aqueous GUMS Z 06/30/14 06/30/1415:18 1406305005 <br /> .06-2147-2 Matrix Spike Duplicate Aqueous GC/MS Z 06/30/14 06/30/1415:44 1406305005 <br /> Parameter Samole S ike MS MS MSD MSD %Rec.CL RPD RPD CL Qualifiers <br /> Conc. Added Conc. TReo. Conc. EEL <br /> Benzene ND 50.00 48.83 98 48.71 97 80-120 0 0-20 <br /> Ethylbenzene ND 50.00 49.51 99 49.25 98 75-125 1 0-20 <br /> Toluene ND 50.00 49.81 100 50.00 100 75-120 0 0-20 <br /> p/m-Xylene ND 100.0 101.4 101 100.5 100 75-130 1 0-20 <br /> o-Xylene ND 50.00 54.06 108 53.77 108 80-120 1 0-20 <br /> U <br /> E <br /> a <br /> I <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 />