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►a n . u <br /> J. 4 SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> lie limp (916) 921 9600 - FAX (916) 921-0100 <br /> Groundwater Technology Client Project ID Texaco, Charter Way, Stockton <br /> 1401 Halyard Drive, Suite 140 <br /> West Sacramento, CA 95691 >` <br /> Attention John Bower QC Sample Group 2020125-35 Reported Feb 18, 1992,, <br /> m t�A <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 Feb 14, 1992 Feb 14, 1992 Feb 14, 1992 Feb 14, 1992 <br /> QC Sample # 202-0108 202-0108 202-0108 202-0108 <br /> Sample Conc N D N D N D N D <br /> Spike Conc <br /> Added 10 10 10 20 <br /> Conc Matrix <br /> Spike: 89 92 93 188 <br /> Matrix Spike <br /> % Recovery 89 92 93 94 <br /> Conc Matrix <br /> Spike Dup 87 89 9 185 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 87 89 90 92 <br /> Relative <br /> Difference 23 33 33 1 6 <br /> SEQUOIA ANALYTICAL %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 2020125 GGG <7> <br />