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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 <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Minser QC Sample Group 203-0453 Reported Mar 26, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Lead Nickel <br /> Method EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravalloti <br /> Reporting Units mg/L mg/L mg/L <br /> Date Analyzed Mar 24, 1992 Mar 24 1992 Mar 24, 1992 <br /> QC Sample # 203-0408 203-0408 203-0408 <br /> Sample Conc 0 032 N D 0 051 <br /> Spike Conc <br /> Added. 1 1 1 <br /> Conc. Matrix <br /> Spike 083 0 85 086 <br /> Matrix Spike <br /> % Recovery- 80 85 81 <br /> Conc Matrix <br /> Spike Dup 0 92 096 1 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 89 96 96 <br /> Relative <br /> % Difference 10 9 9 15 <br /> SSEQUOIA ANALYTICAL /o Recovery Conc of M S Conc of Sample x 100 <br /> � / /7 Spike Conc Added <br /> Relative% Difference Gone of M S -Conc of M S 0 x 100 <br /> Michael R Giles {Conc of M S + Conc of M S D) /2 <br /> Laboratory Director <br /> 2030453 BBB <4> <br />