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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415) 364-96061- FAX(415) 364-9233 <br /> Waterwork plerrt Prefect ID: 376.Chevron.Stockton <br /> 1710 Main Street <br /> �EScalon,CA 95320 <br /> Atterltlon Tina LePage DC Sample Group• 705133&1340 Reported: May 2ff. 1991 ,y <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method. gals/Bozo Bois/Bozo 8015/8= 8015/8= <br /> Analyst: S Hoffmann S.Hoffmann S Hoffmann S.Hoffmann <br /> Reporting Units: ng ng ng ng <br /> Date Analyzed. May 13, 1991 May 13, 1991 May 13, 1991 May 13, 1991 <br /> QC Sample# CBLK 051391 GBLK 051391 GBLK 051391 GBLK 051391 <br /> Sample Conc: N D. N.D N D. N.D <br /> Spike Conc. <br /> Added: 100 100 100 300 <br /> Conc. Matrix <br /> Spike: 100 100 100 310 <br /> Matrix Spike <br /> %Recovery: 100 100 100 100 <br /> Conc Matrix <br /> Spike Dup.: 100 100 100 320 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 100 100 100 110 <br /> Relative <br /> % Difference: 00 0.0 00 32 <br /> I <br /> SEQUOIA ANALYTICAL %Reoovery, Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added i <br /> i <br /> i <br /> Relative%Difference Conc of KS -Cosec of M S.D x 100 <br /> et a (Cone-of M S. + of M D) 2 <br /> 7roject Manager 1os133aw�z c3> <br />