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j SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive + Redwood City, CA 94063 <br /> (415) 364-9600 + FAX(415) 364-9233 <br /> v txur ry.Sh♦Y•r.y ry v. .0 v y.yn r,r rHv vy n r rr,. . vv r c r w. . v r r tr n r v 3 ysf. s r r .. <br /> Blame Tech Services, Inc Client Protect ID Shell, 6131 Pacific Ave, Stockton h <br /> 985 Timothy Drive <br /> San Jose, CA 95133 <br /> Attention Glen Bennett QC Sample Group 3011272-5 Reported Jan 25, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst M Nipp M Nipp M Nipp M Nipp <br /> Reporting Units yg/L erg/L Ng/L u9/L <br /> Date Analyzed Jan 13, 1993 Jan 13, 1993 Jan 13, 1993 Jan 13, 1993 <br /> QC Sample# G3011267 G3011267 G3011267 G3011267 <br /> Sample Conc N D N D N D N D <br /> isSpike Conc <br /> Added 10 10 10 30 <br /> Conc. Matrix <br /> S pike. 73 74 74 22 <br /> Matrix Spike <br /> % Recovery. 73 74 74 73 <br /> Conc. Matrix <br /> Spike Dup : 77 79 79 24 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 77 79 79 80 <br /> Relative <br /> %Difference: 53 65 65 8 7 <br />�EQUDIA ANALYTICAL %Recovery- Cone of M S -Gone of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Cone of M S D x 100 <br /> Fojecm <br /> e (Conc of MS + Cone of M S D)/2 <br /> Manager 3011272 BLA <2> <br />