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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 Project ID W0388, Reeves Exxonµ <br /> 1710 Main Street u <br /> Escalon, CA 95320 <br /> Attention Greg Stahl CC Sample Group 208-0715 Reported. Aug 12, 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 Geckier R Geckler <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Aug 7, 1992 Aug 7, 1992 Aug 7, 1992 Aug 7, 1992 <br /> CC Sample# GSLK080792 GBLK080792 GSLK080792 GBLK080792 <br /> Sample Conc.: N D N D N D N D <br /> Spike Conc. <br /> Added: 020 020 020 060 <br /> Conc. Matrix <br /> Spike: 0.18 019 018 053 <br /> Matrix Spike <br /> %Recovery: 90 95 90 88 <br /> Conc. Matrix <br /> Spike Dup.: 019 020 019 057 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 95 100 95 95 <br /> Relative <br /> % Difference- 54 51 54 73 <br /> SSEQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Cone Added <br /> /� Relative%Difference Cone of M S -Cone of M S D x 100 <br /> rl Lee (Cone of M S + Conc of M S D 2 <br /> rolect Manager 2OW71S WAT <2> <br />