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Page 21 of 33 <br /> u alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> A. 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 82608 <br /> Project: Cordes Ranch, Hansen Road,Tracy, CA Page 3 of 3 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed MS/MSD Batch Number <br /> 1.628-5 Sample Solid GC/MS XX 05/28/14 0512911412:24 140529S006 <br /> 1-628.5 Matrix Spike Solid GC/MS XX 05/28114 0512911413:21 1405295006 <br /> 1-828-5 Matrix Spike Duplicate Solid GC/MS XX 05128/14 0512911413:50 1405295006 <br /> Parameter Samole Soike MS MS MSD MSD %Rec.CL RPD RPD CL Qualifiers <br /> Conc. Added Cone. %Rec. Cone. o Rec. <br /> Benzene ND 50.00 36.27 73 37.85 76 61-127 4 0-20 <br /> Ethylbenzene ND 50.00 39.58 79 41.45 83 57-129 5 0-22 <br /> Toluene ND 50.00 37.76 76 39.16 78 63-123 4 0-20 <br /> p/m-Xylene ND 100.0 84.13 84 88.27 88 70-130 5 0-30 <br /> o-Xylene ND 50.00 42.52 85 44.70 89 70-130 5 0-30 <br /> n <br /> U <br /> E <br /> R <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 />