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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: City of Stockton, Fire Sta., #9
<br /> is 1710 Main Street
<br /> at
<br /> ,aEscalon, CA 95320 r:
<br /> Attention: Bili Channell QC Sample Group: 01 1 1492-0 E 11493 Re rted: Nov 28, 1990
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<br /> OUALITY CONTROL DATA REPORT
<br /> ANALYTE Diesel Benzene Toluene Ethyl Xylenes
<br /> Benzene
<br /> EPA EPA EPA EPA
<br /> Method: EPA 8015 8=/8015 8020/8015 8020/SD15 8D20/8015
<br /> Analyst: M.Ramos G.Meyer G.Meyer G.Meyer G.Meyer
<br /> Reporting Units: mg/kg ng ng ng ng
<br /> Date Analyzed: Nov 2o, 1990 Nov 21, 1990 Nov 21, 1990 Nov 21, 19M Nov 21, 1990
<br /> QC Sample #: Matrix G9112693 G9112693 G9112693 69112693
<br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D.
<br /> Spike Cone.
<br /> Added: 15 100 100 100 300
<br /> Cone.Matrix
<br /> Spike: 13 80 80 85 260 {
<br /> t
<br /> Matrix Spike
<br /> %Recovery: 87 80 80 85 85
<br /> Conc. Matrix
<br /> Spike Dup.: 14 85 84 86 260
<br /> Matrix Spike
<br /> Duplicate
<br /> %Recovery: 93 85 84 86 87
<br /> Relative
<br /> %Difference: 7.4 6.0 5.0 1.0 20
<br /> SEQUOIA ANALYTIC %Recovery: Cone.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 /> zabeth W. Nackl ( )
<br /> Conc.of M.S. + Conc.of M.S.D. 2
<br /> roject Manager 111492WAT <3>
<br />
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