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SEQUOIA ANALYTICAL <br /> Chesapeake680 Redwood Y. CA 94063 <br /> (415) 364-9600 FAX {415} 364-9233 <br /> RESNA Client Project ID W6294 00, Laidlaw Analyst <br /> 1710 Main Street Method EPA 5030/8020 <br /> Escalon, CA 95320 Units Ng/L Analyzed <br /> Attention John Lane QC Sample Group 3E32801 Reported <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Sample Result: N D N D N D N D <br /> Spike Conc. <br /> Added: 5 0 5 0 50 15 <br /> Spike Result 5 6 54 5 7 17 <br /> Spike <br /> %Recovery: 112 108 114 113 <br /> Spike Dup. <br /> Result 56 54 57 17 <br /> Spike Dup. <br /> % Recovery: 112 108 114 113 <br /> Upper Control <br /> Limit%: 123 118 126 114 <br /> Lower Control <br /> Limit%: 87 89 88 92 <br /> Relative <br /> % Difference 00 00 00 00 <br /> Maximum <br /> RPD 83 79 80 12 <br /> 7P&E,C!�ftANAL %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Conc ofMSD x 100 <br /> Ic T {Conc of M S + Conc of M S D}/2 <br /> r 37=32801 WAT <2> <br />