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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> Delta Environmental Consultants Client Project ID 620 W Charterway, Shell <br /> 3330 Data Drive <br /> Rancho Cordova, CA 95670 <br /> Attention Scott Romine OC Sample Group 2014651 -55 Reported Feb 7, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X enes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Villar J Villar J Villar J Viilar <br /> Reporting Units N9/L pg/L pg/L Y8/L <br /> Date Analyzed Feb 3 1992 Feb 3, 1992 Feb 3, 1992 Feb 3, 1992 <br /> OC Sample # GBLK020392 GBLK020392 OBLK020392 GBLK020392 <br /> Sample Cone.- N D N D N D N D <br /> Spike Cone <br /> Added: 10 10 10 30 <br /> Cone Matrix <br /> Spike- 11 11 11 33 <br /> Matrix Spike <br /> % Recovery 110 110 110 110 <br /> Cone. Matrix <br /> Spike Dup 10 10 10 31 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery. 100 100 100 103 <br /> Relative <br /> %Difference 95 9 5 95 63 <br /> )SEQUOIA <br /> 3 <br /> )SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Made A Springer (Gonc of M S + Conc of M S D)/2 <br /> Project Manager 2014649 DLT <4> <br />