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® SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 e Sacramento, CA 95834 <br /> (916) 921-9600 e 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 Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppb ppb ppb ppb <br /> Date Analyzed Sep 11 1992 Sep 11, 1992 Sep 11, 1992 Sep 11, 1992 <br /> QC Sample# 209-0082 209-0082 209-0082 209-0082 <br /> Sample Cone N D N D N D N D <br /> . Spike Cone. <br /> Added 10 10 10 20 <br /> Cone Matrix <br /> Spike 92 94 96 19 <br /> Matrix Spike <br /> %Recovery 92 94 96 95 <br /> Cone Matrix <br /> Spike Dup 94 94 97 19 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 94 94 97 95 <br /> Relative <br /> % Difference 22 00 10 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 /> f Spike Conc Added <br /> i <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 8CP <3? <br />