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SEQUOIA ANALYTICAL
<br /> 680 Chesapeake Drive - Redwood Cdy, CA 94063
<br /> (415) 364-9600 - FAX(415) 364-9233
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<br /> `Delta Environmental Consultants Client Project ID #40-88-146 01, Snell, Stockton
<br /> ' '3330 Data Drive
<br /> Rancho Cordova, CA 95670
<br /> `Attentllo_n: Jim Brownell QC Sample Group 0080940-946 Reported Aug 15, 1990
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<br /> QUALITY CONTROL DATA REPORT
<br /> ANAL E Benzene Toluene Ethyl Xylenes
<br /> 1 Benzene
<br /> Method EPA 8024 EPA 8020 EPA 8020 EPA 8020
<br /> ' Analyst M Lan M Lara M Lara M Lara
<br /> Reporting Units mg/kg mg/kg mg/kg mg/kg
<br /> Date Analyzed Aug to, 1990 Aug 10, 1990 Aug 10, 1990 Aug 10, 1990
<br /> QC Sample# 008-1722 008-1722 008-1722 006.1722
<br /> r Sample Conc: N D 00099 N D N D
<br /> Spike Conc.
<br /> Added: 020 020 020 060
<br /> Conc. Matrix
<br /> Spike: 016 018 018 058
<br /> Matrix Spike
<br /> % Recovery: 80 90 90 97
<br /> Conc. Matrix
<br /> Spike Dup.: 016 020 019 060
<br /> Matrix Spike
<br /> Duplicate
<br /> % Recovery: 80 95 95 100
<br /> ' Relative
<br /> % Difference: 0 11 54 34
<br /> ' SEQUOIA ANALYTICAL %Recovery, Conc of M S -Conc of Sample x 100
<br /> Sp3ks Conc Added
<br /> Relative%Difference Conc of M S -Cone of M S D x 100
<br /> Vickie Tague (Conc of M S + Conc of MSD)/2
<br /> Project Manager 809x0 DLT <2,
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