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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Brown &Caldwell Client Project ID Arco#2133, Stockton v n <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Tan QC Sample Group 210-0394 Reported Oct 22, 1992 <br /> fi <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti <br /> Deporting Units ug/L u9/u us/I- ug/L <br /> Date Analyzed Oct 20, 1992 Oct 20, 1992 Oct 20, 1992 Oct 20, 1992 <br /> QC Sample # 210-0282 210-0282 210-0282 210-0282 <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: 86 89 90 18 <br /> Matrix Spike <br /> % Recovery- 86 89 90 90 <br /> Conc. Matrix <br /> Spike Dup. 89 93 93 19 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 89 93 93 95 <br /> Relative <br /> %Difference: 34 44 33 5 4 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTIC L %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of M S D x 100 <br /> Michael R Giles (Conc of MS + Conc of M S D) 2 <br /> Laboratory Director <br /> 2100394 BAS <3> <br />