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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 209-0126 Reported Sep 15, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Copper Lead Nickel Zinc <br /> Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 <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 Sep 15 1992 Sep 15, 1992 Sep 15, 1992 Sep 15, 1992 Sep 15, 1992 Sep 15, 1992 <br /> OC Sample # 209-0126 209-0126 209-0126 209-0126 209-0126 209-0126 <br /> Sample Conc - N D N D N D N D N D 0 039 <br /> Spike Conc. <br /> Added 10 10 10 10 10 10 <br /> Conc. Matrix <br /> Spike 10 099 11 096 11 1 0 <br /> Matrix Spike <br /> %Recovery- 100 99 110 96 110 96 <br /> Conc. Matrix <br /> Spike Dup 10 097 11 099 11 098 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 100 97 110 99 110 94 <br /> Relative <br /> % Difference 00 20 00 31 00 20 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Cone 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 /> 2090126 BCP <4> <br />