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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite 1_M • Concord California 94520 <br /> (510) 686 9600 FAX (510) 686 9689 <br /> kon Geosclence Client Project 10 Mobil #04-NP4/ 30-0140-02 <br /> 5870 Stoneridge Drive, Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention Cyril Yong OC Sample Group 205-0799 Reported May 19, 1992 <br /> > !'r.n.,�.R.wv <ii,. .� ,. .. ..., t4 y. . .a-./rf• rJ ,. v 'x'hti'^c�c Yt^^y`�`r"nvn pry//ten,..r a'/ �,. <br /> } • k ..rfl/J/ <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst J F J i= J F J F <br /> Reporting Unats ug/L ug/L ug/L ug/L <br /> Date Analyzed May 18 1992 May 18, 1992 May 18, 1992 May 18, 1992 <br /> OC Sample # Matrix Bunk Matrix Blank Matnx Blank Matrix Blank <br /> Sample Conc N D N D N D N D <br /> Spike Conc <br /> Added 20 20 20 60 <br /> Conc. Matrix <br /> Spike: 18 18 20 58 <br /> Matrix Spike <br /> % Recovery: 90 90 100 97 <br /> Conc. Matrix <br /> Spike Dup.: 18 18 20 58 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 90 90 100 97 <br /> Relative <br /> % Difference: 00 00 00 00 <br /> OSEQUOIA ANALYTICAL covert' Cone of c x 100 <br /> Spike Conc ded <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Scott Chte O -(Conc o M + nc of M 2 <br /> Project Manager 20507 <2> <br />