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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 1D Arco #2133, Stockton <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Misner QC Sample Group 206-0235 Reported Jun 22, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Nickel Znc Lead <br /> Method EPA 6010 EPA 6010 EPA 6010 <br /> Analyst Chiaravallob Chiaravalloti Chiaravallott <br /> Reporting Units mg/L mg/L mg/L <br /> Date Analyzed Jun 15, 1992 Jun 15, 1992 Jun 15, 1992 <br /> QC Sample# 206-0235 206.0235 206.0235 <br /> Sample Conc - N D 0 032 N D <br /> Spike Conc <br /> Added. 10 10 0 050 <br /> Conc Matrix <br /> Spike 099 10 0 046 <br /> Matrix Spike <br /> %Recovery: 99 97 92 <br /> Conc. Matrix <br /> Spike Dup.: 10 10 0 046 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery. 100 97 92 <br /> Relative <br /> % Difference 10 00 00 <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 Cone of M S -Cone of M S D x 100 <br /> Michael R Giles (Cont of M S + Conc of M S D) 2 <br /> Laboratory Director <br /> 2060235 BCP <4> <br />