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680 Chesapeake v <br /> Sequoia P e Dri a Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 1WJF Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> J&e I nfelder Client Project ID 20-1129-30 G01 <br /> 25 East Myrtle St Matrix Water <br /> Stockton, CA 95205 <br /> Attention Roman Racca QC Sample Group 7060644-0645 Reported Jun 23, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes; Diesel <br /> ' Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 DHS LUFT <br /> Analyst S Phillips S Phillips S Phillips S Phillips C Lee <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 300 ug/L <br /> LCS Batch# LCS1162397 LCS062397 LCS062397 LCS1161317 LCS062097 <br /> Date Prepared 06/23/97 06/23/97 06/23/97 06/23/97 06/20/97 <br /> Date Analyzed 06/23/97 06/23/97 06/23/97 06/23/97 06/20/97 <br /> Instrument I D ## GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-3B <br /> LCS % <br /> Recovery 96 89 88 87 83 <br /> Control Limits 70-130 70-130 70-130 70-130 60-140 <br /> MS/MSD <br /> Batch #• 7060644 7060644 7060644 7060644 13SO62097 <br /> Date Prepared- 06/23/97 06/23/97 06/23/97 06/23/97 06/20/97 <br /> Date Analyzed 06/23/97 06/23/97 06/23/97 06/23/97 06/20/97 <br /> ' Instrument I D # GCHP 2 GCHP 2 GCHP-2 GCHP-2 GCHP-3B <br /> Matrix Spike <br /> % Recovery 91 86 82 80 83 <br /> Matrix Spike <br /> Duplicate% <br /> ' Recovery 92 87 82 80 85 <br /> Relative% <br /> Difference 1 1 12 00 00 24 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> M f 1�\VAJJO preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> dans M Fruciano and are not used to accept or reject batch results <br /> Protect Manager/Sacramento Laboratory <br /> 7060644 KLF <6> <br /> f <br />