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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> Ar .�Jf..urS` <br /> "Watennrorkr kfwlJSa'L rr.?�C r♦ f R[W7♦ n rnv A^ rar rva� n�±M1�.� <br /> Gient Project ID W4388, Reeves Exxon <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention Lois Frantz QC Sample Group 1123903, 3905-6,3909 Reported: Jan 6, 1992 f <br /> � �"�"�sr+ see-t. ';' t yx w+c^"vnc" �h�°' ,s�,.�.�.... �.:ut a f sr}f{^�{Rn. "kr k'°°..Y+rA,.r.�. » S"r 5�o- r�3r•ro- arm e <br /> QUALITY CONTROL DATA REPORT . <br /> 1 <br /> ANALYTE Ethyl- <br /> Benzene Toluene benzene Xylenes <br /> ' Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Donohue C Donohue C Donohue C Donohue <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Dec 27, 1991 Dec 27, 1991 Dec 27, 1991 Dec 27, 1991 <br /> ' OC Sample# GBLK122791 GSLK122791 GBLK122791 GSLK122791 <br /> Sample Conc.: N D N D N D N D <br /> Spike Conc. <br /> ' Added: 020 020 020 060 <br /> Conc. Matrix <br /> ' Spike: 018 0.18 018 054 y <br /> Matrix Spike <br /> % Recovery: 90 90 90 90 <br /> ' Conc Matrix <br /> Spike Dup : 017 017 017 050 <br /> ' Matrix Spike <br /> Duplicate <br /> % Recovery. 85 85 85 83- _ <br /> ' Relative <br /> %Difference 57 5 7 5 7 77 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> /1 Relative%Difference Conc of M S -Conc of M S D x 100 <br /> PLe "�" � V l (Conc alMS + Conc of MSD)/2in <br /> nager 1123903 WAT c7> <br />