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1 , <br /> Page 9 of 15 <br /> tiff eurofins Quality Control - Spike/Spike Duplicate <br /> Calscience <br /> Conestoga-Rovers&Associates Date Received: 07/30/14 <br /> 19449 Riverside Drive, Suite 230 Work Order: 14-07-2003 <br /> Sonoma, CA 95476-6955 Preparation: EPA 5030C <br /> Method: EPA 82606 <br /> Project: Cordes Ranch, Hansen Road,Tracy, CA Page 1 of 1 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed MS/MSD Batch Number <br /> MW-16 Sample Aqueous GCIMS V V 07/30/14 07/31/14 01:24 1407305036 <br /> MW-16 Matrix Spike Aqueous GC/MS V V 07/30/14 07/31/14 02:27 1407305036 <br /> MW-16 Matrix Spike Duplicate Aqueous GC/MS V V 07/30/14 07/31114 02:58 1407305036 <br /> Parameter Sample Spike MS MS MSD MSD %Rea CL RPD RPD CL Qualifiers <br /> Conc. Added nc. %Rec. nc. ° Rec. <br /> Benzene ND 50.00 52.14 104 45.88 92 74-122 13 0-21 <br /> Ethylbenzene ND 50.00 55.82 112 54.50 109 77-125 2 0-24 <br /> Toluene ND 50.00 53.17 106 53.19 106 72-126 0 0-23 <br /> p/m-Xylene ND 100.0 114.2 114 110.3 110 63-129 3 0-25 <br /> o-Xylene ND 50.00 61.51 123 59.47 119 62-128 3 0-24 <br /> v <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 />