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Page 42 of 57 <br /> tiff eurofins Calscience Quality Control - Spike/Spike Duplicate <br /> Conestoga-Rovers&Associates Date Received: <br /> 19449 Riverside Drive, Suite 23006/14/14 <br /> Work Order: <br /> Sonoma, CA 95476-6955 Preparation: 14-06-1139 <br /> Method: <br /> EPA 5030C Project: Cordes Ranch, Hansen Road, Tracy, CA EPA 8260B <br /> Page 5 of 5 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed MS/MSD Batch Number <br /> 8119-10 Sample Solid <br /> GC/MS BB 06/16/14 06/16/1415:24 1406165019 <br /> 8719.10 Matrix Spike Solid <br /> GC/MS BB 06/16/14 06/76/1415:50 1406165019 <br /> 8119.70 Matrix Spike Duplicate Solid <br /> GC/MS Be 06/16/14 06/16/14 16:17 1406165019 <br /> Parameter Samole Spike MS <br /> Conc. Added Conc. aft2. CC DC. MRec.SD "MRec.CL RPD RPD Qualifiers <br /> Benzene ND 50.00 40,34 81 <br /> Ethylbenzene - 41.56 83 61-127 3 0-20 <br /> ND 50.00 46.00 92 47.32 95 <br /> Toluene ND 50.00 42.35 85 57-129 3 0-22 <br /> p/m-Xylene 43.26 67 63-123 2 0-20 <br /> ND 100.0 95.27 95 98.35 98 <br /> o-Xylene ND 50.00 48,91 98 70-130 3 0-30 <br /> 50.96 102 70-130 4 0-30 <br /> U <br /> RPD:Relative Percent Difference. CL:Control Limits <br /> 7440 Lincoln Way,Garden Grove,CA 92841-7427 TEL:(714)895-5494 FAX:(714)894-7501 <br />