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Page 27 of 40 <br /> alscience <br /> nvironmenta/ Quality Control - Spike/Spike Duplicate <br /> . aborator/es,Inc. <br /> Conestoga-Rovers&Associates Date Received: 07/17/13 <br /> 19449 Riverside Drive, Suite 230 Work Order: 13-07-1058 <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 Matrix Instrument Date Prepared Date Analyzed MS/MSD Batch Number <br /> MW-14C Aqueous GCIMSA 07/19/13 07/1911316:45 130719501 <br /> Parameter Sample Spike MS MS MSD MSD °oRec.CL RPD RPD CL Qualifiers <br /> Conc. Added Conc. °oRec Comic °oRec. <br /> Benzene ND 50.00 47.89 96 46.78 94 78-120 2 0-20 <br /> Ethylbenzene ND 50.00 52.69 105 53.07 106 73-127 1 0-20 <br /> Toluene ND 50.00 49.95 100 49.11 98 72-126 2 0-20 <br /> p/m-Xylene ND 100.0 104.4 104 103.1 103 70-130 1 0-30 <br /> o-Xylene ND 50.00 50.80 102 50.94 102 70-130 0 0-30 <br /> U <br /> 2 <br /> K <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 />