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j SEQUOIA ANALYTICAL
<br /> 680 Chesapeake Drive * Redwood City, CA 94063
<br /> (415) 364-9600 - FAX (415) 364-9233
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<br /> }{Waterwork Client Project ID WO388, Reeves Exxon
<br /> ' 1710 Main Street
<br /> Escalon, CA 95320
<br /> �Attentlon: Greg Stahl QC Sample Group 11_2-4773w5� Reported Jan 9, 1992
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<br /> QUALITY CONTROL DATA REPORT
<br /> ANALYTE Ethyl-
<br /> Benzene Toluene benzene Xylenes Kesel
<br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015
<br /> Analyst J Villar J Villar J Villar J Villar R Lee
<br /> Reporting Units pg/L pg/L pg/L pg/L pg/L
<br /> Date Analyzed Jan 3, 1992 Jan 3. 1992 Jan 3, 1992 Jan 3, 1992 Jan 3, 1992
<br /> QC Sample# GBLK010392 GBLK010392 GBLK010392 Gi3LK010392 DBLK010292
<br /> Sample Conc.: N D N D N D N D N D
<br /> Spike Conc.
<br /> Added: 10 10 10 3Q 300
<br /> 1
<br /> Conc Matrix
<br /> Spike: 91 92 91 27 200
<br /> Matrix Spike
<br /> ' % Recovery: 91 92 91 90 67
<br /> Conc. Matrix
<br /> Spike Dup.: 98 98 98 30 200
<br /> Matrix Spike
<br /> ' Duplicate
<br /> % Recovery: 98 98 98 100 67
<br /> ' Relative
<br /> % Difference: 74 63 74 10 00
<br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100
<br /> Spike Conc Added
<br /> Relative 96 Difference Conc of M S -Conc at M S D x 100
<br /> 1 r (J�
<br /> ia Lee (Conc of M S + Conc of M S 0) 2
<br /> roject Manager 1124773 WAT <T>
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