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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, 3725 Tracy Blvd, Tracy <br /> 985 Timothy Drive <br /> San Jose, CA 95133 <br /> Attention Glen Bennett OC Sample Group 3BB6501-04 deported Mar 8, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYT>: <br /> Ethyl- <br /> Benzene Tcluene Benzene Xyl=nes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst E Cunanan E Cunanan E Cunanan E Cunanan <br /> Reporting Units pg/L pg/L pg/L ug/L <br /> Date Analyzed Mar 3 1993 Mar 3, 1993 Mar 3, 1993 Mar 3, 1993 <br /> OC Sample # G313136501 G3686501 G3BB65o1 G38136501 <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 99 99 30 <br /> Matruc Spike <br /> %Recovery- 97 99 99 100 <br /> Conc. Matnx <br /> Spike Dup.. 96 97 94 29 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 96 97 94 97 <br /> Relative <br /> %Difference: 10 20 52 34 <br />. SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample X loo <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> roject Manager (Conc of M S + Conc of M S D) 2 <br /> 3886601 BLA <2> <br />