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1' I <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX(415) 364-9233 <br /> I <br /> Blaine Tech Services, Inc Client Project ID Shell, 420 Kettleman, Lodi <br /> 985 Timothy Drive <br /> San Jose, CA 95133 <br /> Attention Glen Sennett 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 p9/L us/L us/L u9/L <br /> Date Analyzed Jan 29 1993 Jan 29 1993 Jan 29, 1993 Jan 29, 1993 <br /> OC Sample # 3A44501 3A44501 3A44501 3A44501 <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 84 85 86 26 <br /> Matrix Spike <br /> %Recovery 84 85 86 87 <br /> Conc Matrix <br /> Spike Dup 91 9 2 92 28 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 91 92 92 93 <br /> Relative <br /> % Difference, 80 7 9 6 7 74 <br /> 0 SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative% <br /> ��a Difference Conc of M S -Conc of M S D x 100 <br /> a s ee (Conc of M S + Cons of M 5 D)/2 <br /> ` Project Manager 3A40701 BLA <3> <br />