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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 Misner QC Sample Group 301-0283 Reported Jan 26, 1993 <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 Jan 20, 1993 Jan 20, 1993 Jan 20, 1993 Jan 20, 1993 Jan 20, 1993 Jan 20 1993 <br /> QC Sample # 301.0224 301.0224 301-0224 301-0224 301-0224 301-0224 <br /> Sample Conc : N D N D 0 043 N D N D 0 069 <br /> Spike Conc. <br /> Added: 10 10 10 10 10 10 <br /> w <br /> Conc. Matrix <br /> Spike 10 10 12 10 10 10 <br /> Matrix Spike <br /> % Recovery- 100 100 116 100 100 93 <br /> Conc. Matrix <br /> Spike Dup . 098 10 11 096 10 10 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 98 100 106 96 100 93 <br /> Relative <br /> % Difference• 20 00 87 41 00 00 <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 /> (fi' 4�z� <br /> Spike Conc Added <br /> V <br /> Relative 96 Difference Conc of M S -Conc o#MSD x 100 <br /> Michael R Giles (Conc of M S + Conc of M TD)/2 <br /> Laboratory Director 3010263 BRS <7> <br />