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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 - FAX (415) 364-9233 <br /> RESNA Client Prosect ID WU148 i, Stockton Police <br /> 1710 Main Street n <br /> Escalon, CA 95320 <br /> Attention John Lane OC Sample Group 2080548-51 Reported Aug 13, 1992 <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 R Geckler R Geckler R Geckler R Geckler <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Aug 6, 1992 Aug 6, 1992 Aug 6, 1992 Aug 6, 1992 <br /> OC Sample# GBLK080692 GBLK080692 GBLK080692 GBLK080692 <br /> Sample Cone: N D N D N D N D <br /> Spike Cone. <br /> Added: 020 020 020 0 60 <br /> Cone. Matrix <br /> Spike. 019 019 019 055 <br /> Matrix Spike <br /> %Recovery 95 95 95 92 <br /> Cone. Matrix <br /> Spike Dup 020 0 21 020 059 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 100 105 100 98 <br /> Relative <br /> % Difference 5 1 10 51 7 0 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 1o0 <br /> •S <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> ytrorjlect <br /> ee (Conc of M S + Conc of M S D}/2 <br /> Manager 2080548 WAT <3> <br />