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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Iwo- Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group Client Project ID 920-119 1A/Chevron 9-6171 Stockton, CA <br /> 11315 Sunrise Gold Circle Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson CC Sample Grou 8010310-0314 Reported Jan 26, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1 1 Dichloro- Chloro- <br /> ethene Trichloroethene Benzene Toluene benzene <br /> Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br /> Analyst K Pocan K Pocan K Pocan K Pocan K Pocan <br /> Concentration <br /> Spiked 2 500 pg/kg 2,500 yg/kg 2 500 ug/kg 2 500 ug/kg 2 500 pg/kg <br /> LCS Batch# LCS012098 LCS012098 LCS012098 LCS012098 LCS012098 <br /> Date Prepared 01/20/98 01/20/98 01/20/98 01/20/98 01/20/98 <br /> Date Analyzed 01/20/98 01/20/98 01/20/98 01/20/98 01/20/98 <br /> Instrument I D # MS-F1 MS-F1 MS F1 MS F1 MS F1 <br /> LCS <br /> Recovery 83 86 84 84 82 <br /> Control Limits 65-135 70-130 70 130 70-130 70 130 <br /> MS/MSD <br /> Batch# SS012098 BS012098 BS012098 BS012098 BS012098 <br /> Date Prepared 01/20/98 01/20/98 01/20/98 01/20/98 01/20/98 <br /> Date Analyzed 01/20/98 01/20/98 01/20/98 01/20/98 01/20/98 <br /> Instrument I D # MS-171 MS-Fl MS-F1 MS-171 MS-F1 <br /> Matrix Spike <br /> % Recovery 83 86 84 85 82 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 82 82 88 87 83 <br /> Relative% <br /> Difference 1 2 48 47 23 12 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br />�SEOUO A ANALYTICAL 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 IVIS/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> in C Schneider <br /> Project Manager/Sacramento Laboratory <br /> 8010310 PETS ¢26> <br />