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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 207-0441 Reported Jul 29, 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 Jul 27, 1992 Jul 27, 1992 Jul 27, 1992 Jul 27, 1992 <br /> QC Sample # 207-0448 207-0448 207-0448 207.0448 <br /> Sample Conc. 036 063 N D N D <br /> Spike Conc <br /> Added: 10 10 10 20 <br /> Conc. Matrix <br /> Spike- 11 11 10 20 <br /> Matrix Spike <br /> %Recovery 106 104 100 100 <br /> Conc Matrix <br /> Spike Dup.: 11 12 11 21 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 106 114 110 105 <br /> Relative <br /> %Difference- 00 92 95 49 <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 /> ` —!� Spike Conc Added <br /> '17 Relative%Difference Cone of M S -Conc of MSD x 100 <br /> Michael R Giles - (Conc of M S + Conc of M S D) 2 <br /> Laboratory Director <br /> 2070441 BGP <2> <br />