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L <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 9219600 • FAX (916) 921-0100 <br /> Groundwater Technology Client Project ID Manteca Sean <br /> 1401 Halyard Drive, Suite 140 <br /> West Sacramento, CA 95691 <br /> Attention Scott Gable OC Sample Group 2050552-59 Reported Jun 4, 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 Anatyzed Jun 2, 1992 Jun 2, 1992 Jun 2, 1992 Jun 2, 1992 <br /> QC Sample# 205-0552 205-0552 205-0552 205-0552 <br /> Sample Cone. N D N D N D N D <br /> Spike Cone <br /> Added: 10 10 10 20 <br /> I <br /> Cone Matrix <br /> Spike 82 89 86 17 <br /> i <br /> Matrix Spike <br /> % Recovery 82 89 86 85 <br /> Conc Matrix <br /> Spike Dup 87 94 91 18 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 87 94 91 90 <br /> Relative <br /> % Difference 59 55 78 5 7 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> //(�l Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S 0 X100 <br /> Michael R Giles (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 2050552 GRW c3> <br />