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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Groundwater Technology Client Project ID Texaco,440 west Charter way,Stockton <br /> 1401 Halyard Drive, Suite 140 <br /> West Sacramento, CA 95691 <br /> Attention John Bower QC Sample Group 2050406-17 Reported Jun 2, 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 C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppb ppb ppb ppb <br /> Date Analyzed May 28, 1992 May 28, 1992 May 28, 1992 May 28, 1992 <br /> QC Sample# 205-0500 205-0500 205-0500 205-0500 <br /> Sample Cone N D N D N D N D <br /> • Spike Cone <br /> Added 10 10 10 20 <br /> Conc Matrix <br /> Spike 8 0 82 84 17 <br /> Matrix Spike <br /> % Recovery 80 82 84 85 <br /> Cone Matrix <br /> Spike Dup 81 86 86 18 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 81 86 86 90 <br /> Relative <br /> % Difference 1 2 4 8 2 4 5 7 <br /> SEQUOIA ANALYTI i4L % Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 2050406 GRW <5> <br />