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4 <br /> SEQUOIA <br /> ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> Blame Tech Services, Inc Client Project ID Shell, 420 Kettleman, Lodi <br /> 985 Timothy Drive <br /> San Jose, CA 95133 <br /> Attention Glen Bennett QC Sample Group 3A40701-04 Reported Feb 4, 1993 <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 M Nipp M Nipp M Nipp M Nipp <br /> Reporting Units u9/L pg/L pg/L 99/1- <br /> Date <br /> g/LDate Analyzed Jan 28 1993 Jan 28 19933 Jan 28, 1993 Jan 28, 1993 <br /> QC Sample # 3A40701 3A40701 3A40701 3A40701 <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 93 98 97 29 <br /> Matrix Spike <br /> % Recovery 93 98 97 97 <br /> Conc, Matrix <br /> Spike Dup 90 94 92 28 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 90 94 92 93 <br /> Relative <br /> %Difference* 3 3 42 53 42 <br /> 0 SEQUOIA ANALYTICAL % Recovery Conc of M S Conc of Sample x 100 <br /> Spike Conc Added <br /> via Relative%Difference Conc of M S -Conc of MSD x 100 <br /> ria Lee (Conc of M S + Conc of M S D)/2 <br /> roject Manager 3A40701 SLA e2, <br /> j <br />