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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 Tan OC Sample Group 210-0394 Reported Oct 22, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Copper Lead Nickel Zinc <br /> Method EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst S Foster S Foster S Foster S Foster S Foster S Foster <br /> Reporting Units mg/L mg/L mg/L mg/L mg/L mg/L <br /> Date Analyzed Oct 20, 1992 Oct 20, 1992 Oct 20, 1992 Oct 20, 1992 Oct 20, 1992 Oct 20, 1992 <br /> OC Sample # 2100394T 2100394T 2100394T 2100394T 2100394T 2100394T <br /> Sample Conc • N D N D N D N D 0 079 N D <br /> Spike Conc. <br /> Added. 10 10 10 10 10 10 <br /> Conc Matrix <br /> Spike 096 096 097 099 1 1 10 <br /> Matrix Spike <br /> % Recovery, 96 96 97 99 102 100 <br /> Conc. Matrix <br /> Spike Dup.: 098 098 099 097 1 1 95 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 98 98 99 97 102 95 <br /> Relative <br /> %Difference- 21 21 20 20 00 51 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> �4wlv—s <br /> Spike Conc Added <br /> Reiative%Difference Conc of M S -Cone of ill S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D) 2 <br /> Laboratory Director <br /> 2100394 BRS <4 n <br />