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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> Blaine Tech Services, Inc Client Project ID SHELL, 620 W Charter Way, Stockton <br /> 9a5 Timothy Drive <br /> San Jose, CA 95133 <br /> Attention Glen Bennett CC Sample Group 3BB6101-09 Reported Mar B, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xvlenes <br /> Method EPA 8020 EPA 8024 EPA 8020 EPA 8020 <br /> Analyst E Cunanan E Cunanan E Cunanan E Cunanan <br /> Reporting Units ug/L ug/L ug/L Yg/L <br /> Date Analyzed Mar 3 1993 Mar 3 1993 Mar 3, 1993 Mar 3, 1993 <br /> OC Sample # G3B66W1 G313BM1 G3BB6501 WB86501 <br /> Sample Conc. N D N D N D N D <br /> Spike Conc. <br /> Added 10 10 10 30 <br /> Conc. Matrix <br /> Spike: 97 9 9 99 30 <br /> Matrix Spike <br /> % Recovery- 97 99 99 100 <br /> Conc Matrix <br /> Spike Dup.. 96 97 94 29 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 96 97 94 97 <br /> Relative <br /> % Difference 10 2 0 5 2 34 <br /> 0SEOUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> ri�L@ ` v (Conc of M S + Conc of M S D y/2 <br /> roject Manager 3BB6101 BLA <5> <br />