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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 OCT 0 t IM2 <br /> (415) 364-9600 - FAX (415) 364-9233 <br /> Alton Geoscience, Inc Client Project ID 30-0140-10, Mobil, 2375 Tracy Blvd <br /> 5870 Stonendge Dr, Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention Cynl Yong QC Sample Group 209-3917 Reported Sep 30, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Diesel <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA W15 <br /> Analyst R Geckler R Geckler R.Geckler R Geckler M Tran <br /> Reporting Units lig/L Ng/L ug/L Erg/L pg/L — <br /> Date Analyzed Sep 28, 1992 Sep 28, 1992 Sep 28, 1992 Sep 28, 1992 Sep 24, 1992 <br /> QC Sample # GBLK092892 GBLK092892 GBLK092892 GBLK092892 DBLK092492 <br /> Sample Conc.. N D N D N D N D N D <br /> Spike Conc. <br /> Added: 10 10 10 30 300 <br /> Conc. Matrix <br /> Spike: 10 99 99 30 250 <br /> Matrix Spike <br /> % Recovery 100 99 99 100 83 <br /> Conc. Matrix <br /> Spike Dup 10 10 10 30 220 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 100 100 100 100 73 <br /> Relative <br /> % Difference 00 10 10 00 13 <br /> SSEQUOIA ANALYTICAL % Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relatnre%Difference Conc of M S -Conc of M S D x 100 <br /> Nokowhat D Herrera (Conc of M S + Conc of MSD)/2 <br /> Project Manager 209W17 ALG <3> <br />