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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> 1916) 921-9600 • FAX (916) 921-0100 <br /> Brown&Caldwell h Client Project ID Arco #2133, Stockton V <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Misner QC Sample Group 206-0025 Reported Jun 12, 1992 <br /> . s . . . • v r v } n <br /> vv.r v n x.} y,. A xSv v v4 . . v 4 nnn nv n mrnv v L.n t n. v v . } rr ♦ v nrn+ <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppb ppb ppb ppb <br /> Date Analyzed Jun 10, 1992 Jun 10, 1992 Jun 10, 1992 Jun 10, 1992 <br /> QC Sample# 206.0027 206-0027 206-0027 206-0027 <br /> Sample Conc. N D N D N D N D <br /> Spike Conc. <br /> . Added, 10 10 10 20 <br /> Conc. Matrix <br /> Spike: 8 2 86 86 18 <br /> Matrix Spike <br /> % Recovery: 82 86 86 90 <br /> Conc. Matrix <br /> Spike Dup : 84 88 89 18 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 84 88 89 90 <br /> Relative <br /> %Difference: 2 4 23 3 4 0 0 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Cone of M 8 •Conc of Sample x 100 <br /> WAVWJII.� Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of MSD x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D) 2 <br /> Laboratory Director <br /> 2060025 BCP <2> <br />