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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 Drive <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 Ethyt- <br /> Benzene Toluene Benzene X enes <br /> Method EPA 8020 BPA 8020 EPA 8020 EPA 8020 <br /> Analyst A.Miraftab A Muaftab A Miraftab A Miraftab <br /> Reporting Units pg/L Yg/L Ng/L N9/L <br /> Date Analyzed Feb 27, 1993 Feb 27, 1993 Feb 27, 1993 Feb 27, 1993 <br /> OC Sample# 3ee59o1 3BB5901 3BB5901 313135901 <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 96 28 <br /> Matrix Spike <br /> % Recovery- 95 95 96 93 <br /> Conc Matrix <br /> Spike Dup.. 10 10 10 30 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 100 100 100 100 <br /> Relative <br /> %Difference 51 51 41 69 <br /> IDSE000IA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> r� 'N an"I Relative%Difference Conc of M S -Conc of MSD x 100 <br /> Lee (Conc of M S + Conc of M S D) 2 <br /> roject Manager 3BB6101 B1A <3> <br />