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SEQUOI NALYTICAL <br /> 819 Striker Avenue, Sults 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Brown& Caldwell Client Project ID Arco #2133, Stockton <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Tan QC Sample Group 211-0554 Reported Dec 3, 1992 <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 /> Reporting Units ug/L pg/L pg/L pg/L <br /> Date Analyzed Nov 30, 1992 Nov 30 1992 Nov 30, 1992 Nov 30 1992 <br /> QC Sample # 211-0532 211-0532 211-0532 211-0532 <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- 92 96 96 17 <br /> Matrix Spike <br /> %Recovery- 92 96 96 85 <br /> Conc Matrix <br /> Spike Dup.. 81 94 91 17 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery. 81 94 91 85 <br /> Relative <br /> % Difference 13 21 53 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTIC %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 M S + Conc of M S D)12 <br /> Laboratory Director <br /> 2110554 BRS <2> <br />