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Y+ <br /> a <br /> R+ 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, 7910 Lower Sacramento Stockton <br /> 985 Timothy Drive <br /> San Jose, CA 95133 <br /> Attention Glen Bennett QC Sample Group 3BB6601 -04 Reported Mar 5, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst R Geckler R Geckler R Geckler R Geckler <br /> Reporting Units ug/L ug/L jus/L ug/L <br /> Date Analyzed Mar 1 1993 Mar 1, 1993 Mar 1 1993 Mar 1, 1993 <br /> QC Sample# 3B81301 3881301 3881301 3881301 <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 9 5 95 95 28 <br /> Matrix Spike <br /> % Recovery 95 95 95 93 <br /> Conc. Matrix <br /> Spike Dup 9 3 93 91 27 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 93 93 91 90 <br /> Relative <br /> % Difference 2 1 21 4 3 3 6 <br /> 0 EOUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of MSD z 100 <br /> ri Lee (Conc of M S + Conc of M S D)/2 <br /> roject Manager 3BB6601 BLA c2> <br />