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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 /> 985 Timothy Dave <br /> San Jose, CA 95133 <br /> Attention Glen Bennett OC Sample Group 3BB6101-09 Reported Mar 8, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xvienes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8024 <br /> Analyst R Geckler R Geckle( R Geckier R Geckler <br /> Reporting Units ug/L pg/L ug/L ug/L <br /> Date Analyzed Mar 1, 1993 Mar 1 1993 Mar 1, 1993 Mar 1, 1993 <br /> OC Sample# 3881301 3881301 3881301 31381301 <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: 95 95 95 28 <br /> Matrix Spike <br /> % Recovery- 95 95 95 93 <br /> Conc. Matrix <br /> Spike Dup.: 93 93 91 27 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 93 93 91 90 <br /> Relative <br /> % Difference 21 21 43 3 6 <br /> SEQUOIA 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 /> ria Lee (Conc of M S + Canc of M S D I /2 <br /> Oroject Manager 3BB6101 BLA <4> <br /> J <br />