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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 208-0170 Reported Aug 20, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Copper Lead Nickel Tinc <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 Aug 17, 1992 Aug 17, 1992 Aug 17 1992 Aug 17, 1992 Aug 17, 1992 Aug 17, 1992 <br /> QC Sample# 208-0170 208-0170 208-0170 208-0170 208-0170 208-0170 <br /> Sample Conc.. N D N D N D N D N D 018 <br /> Spike Conc <br /> Added 2 2 2 2 2 2 <br /> Conc Matrix <br /> Spike 19 18 19 19 18 21 <br /> Matrix Spike <br /> % Recovery 95 90 95 95 90 96 <br /> Conc. Matrix <br /> Spike Dup - 2 19 2 2 2 23 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery. 100 95 100 100 100 106 <br /> Relative <br /> % Difference 51 54 51 51 11 91 <br /> • SEQUOIA ANALYT AL % Recovery Conc of M S -Conc of Sample x 100 <br /> �� �� Spike Conc Added <br /> 0J//�J 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 /> 2080170 SCP <4> <br />