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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 Steven Misner OC Sample Group 204-0181 Reported Apr 20, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Zinc Chromium Lead <br /> Method EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst Chiaravailoti Chiaravallou Ch�aravalloti <br /> Reporting Units mg/L mg/L rng/L <br /> Date Analyzed Apr 13 1992 Apr 13 1992 Apr 13 1992 <br /> CC Sample # 2040060 204-ODE50 2040060 <br /> Sample Conc 013 0 036 N D <br /> Spike Conc <br /> Added 1 1 2 <br /> Conc Matrix <br /> Spike 1 1 099 2 <br /> Matrix Spike <br /> % Recovery 97 95 100 <br /> Conc Matrix <br /> Spike Dup 1 1 1 2 1 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 97 96 105 <br /> Relative <br /> % Difference 00 10 49 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Conc 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 Giles (Conc of M S + Conc of M S D) /2 <br /> Laboratory Director <br /> 2040181 BCP <4> <br />