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Page 10 of 19 <br /> tiff eurofins Quality Control - Spike/Spike Duplicate <br /> Calscience <br /> Conestoga-Rovers&Associates Date Received: 06/28114 <br /> 19449 Riverside Drive, Suite 230 Work Order: 14-06-2155 <br /> Sonoma, CA 95476-6955 Preparation: EPA 5030C <br /> Method: EPA 82608 <br /> Project: Cordes Ranch, Hansen Road,Tracy, CA Page 2 of 2 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed MS/MSD Batch Number <br /> 14-06-2150-1 Sample Aqueous GC/MS Z 07101/14 0710111411:58 1407015016 <br /> 14-06-2150-1 Matrix Spike Aqueous GUMS Z 07/01114 0710111412:25 1407015016 <br /> 14-06-2150-1 Matrix Spike Duplicate Aqueous GCIMSZ 07101/14 0710111412:51 140701S016 <br /> Parameter Sample Spike NMS MS MSD MSD %Rec.CL RPD RPD CL Qualifiers <br /> Conc. Added Conc. ° Rec. Conc. Kgje <br /> Benzene ND 50.00 51.56 103 50.60 101 80-120 2 0-20 <br /> Ethylbenzene ND 50.00 53.18 106 52.06 104 75-125 2 0-20 <br /> Toluene ND 50.00 53.34 107 52.50 105 75-120 2 0-20 <br /> p/m-Xylene ND 100.0 108.4 108 105.7 106 75-130 3 0-20 <br /> o-Xylene ND 50.00 57.20 114 55.97 112 80-120 2 0-20 <br /> 1 <br /> RPD:Relative Percent Difference. CL:Control Limits <br /> 7440 Lincoln Way,Garden Grove,CA 92841-1427 • TEL:(714)895-5494 • FAX:(714)694-7501 <br />