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r , <br /> Page 28 of 40 <br /> Cr aiscience <br /> AL�nvironmental Quality Control - Spike/Spike Duplicate <br /> Ew <br /> aboratories, 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 2 of 2 <br /> Quality Control Sample ID Matrix Instrument Date Prepared Date Analyzed MS/MSD Batch Number <br /> MW-1 Aqueous GC/MS XX 07/18/13 07118/13 13:39 130718501 <br /> Parameter Sample Spike MS MS MSD MSD ° Rec.CL RPDRPD CL Qualifiers <br /> Conc, Added Conc. ^/Rec Cone. oo/Rec <br /> Benzene ND 50.00 47.71 95 47.70 95 78-120 0 0-20 <br /> Ethylbenzene ND 50.00 49.53 99 50.20 100 73-127 1 0-20 <br /> Toluene ND 50.00 48.62 97 48.77 98 72-126 0 0-20 <br /> p/m-Xylene ND 100.0 94.22 94 96.70 97 70-130 3 0-30 <br /> O-Xylene ND 50.00 45.85 92 47.10 94 70-130 3 0-30 <br /> v <br /> z <br /> c <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 />