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i <br /> j 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 #023202124,Lammersville School Dist <br /> 1401 Halyard Drive, Suite 140 <br /> West Sacramento, CA 95691 <br /> Attention Scott Gable QC Sample Group 2040125-30 Reported Apr 20, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xyienes <br /> Method EPA 8020 FPA 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 Apr 15 1992 Apr 15 1992 Apr 15 1992 Apr 15 1992 <br /> OC Sample # 2040127 2040127 2040127 2040127 <br /> Sample Cone • N D N D N D N D <br /> aSpike Cone <br /> Added 10 10 10 20 <br /> Cone Matrix <br /> Spike 87 88 88 17 <br /> Matrix Spike <br /> % Recovery 87 88 88 85 <br /> Cone Matrix <br /> Spike Dup 9 94 91 18 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 90 94 91 90 <br /> Relative <br /> % Difference 34 66 34 57 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Cone 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 Gdes (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 2040125 GRW t3> <br />