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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 VV Charterway, Shell <br /> 3330 Data Drive <br /> Rancho Cordova, CA 95670 <br /> Attention Scott Romine QC Sample Group 2014649-50 Reported Feb 7, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene 'toluene Benzene Xylenes <br /> Method EPA 8024 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst L Laikhtman L_Laikhtman L Laikhtman L Laikhtman <br /> Reporting Units erg/L erg/L ug/L p9/L <br /> Date Analyzed Jan 31, 1992 Jan 31 1992 Jan 31 1992 Jan 31 1992 <br /> QC Sample # GBLK013192 GBLK013192 GBLK013192 GBLK013192 <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 99 10 98 30 <br /> Matrix Spike <br /> % Recovery. 99 100 98 100 <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 1 0 00 2 0 00 <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 104 <br /> Maile AI-AD'Inger <br /> t � (Conc of M S + Conc of MSD)/2 <br /> Project Manager 2014649 DLT <3> <br />