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Page 20 of 33 <br /> a Iscience <br /> `, nvironmental Quality Control - Spike/Spike Duplicate <br /> aboratories, Inc. <br /> Conestoga-Rovers&Associates Date Received: 05/28/14 <br /> 19449 Riverside Drive, Suite 230 Work Order: 14-05-1970 <br /> Sonoma, CA 95476-6955 Preparation: EPA 5030C <br /> Method: EPA 8260B <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 /> 1-873.5 Sample Solid GC/MSQ 05/28/14 05/29/1401:551405285017 <br /> 1.813-5 Matrix Spike Solid GUMS Q 05/28114 05/29/1402:21 1405285017 <br /> 1-813.5 Matrix Spike Duplicate Solid GUMS Q 05/28/14 05/29/14 02:47 1405285017 <br /> Parameter Sample Spike MS MS MSD MSD %Rec.CL RPD RPD CL Qualifiers <br /> Conc. Added Conc. %Rec. Conc. <br /> Benzene ND 50.00 40.34 81 42.52 85 61-127 5 0-20 <br /> Ethylbenzene ND 50.00 39.27 79 41.96 84 57-129 7 0-22 <br /> Toluene ND 50.00 40.46 81 42.84 86 63-123 6 0-20 <br /> p/m-Xylene ND 100.0 76.85 77 83.03 83 70-130 8 0-30 <br /> o-Xylene ND 50.00 38.52 77 41.50 83 70-130 7 0-30 <br /> s <br /> m <br /> o` <br /> U <br /> tt <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 />