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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> ID 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 44W Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific 5nvironmental Group Client Project ID 920-122 1A/Chevron 9-9840 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br />' Attention Tim Anenson CC Sample Group 8030077A Reported Mar 18, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE M-Dwhloro- Trlchloro- Chloro- <br /> ethane ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Pocan K Pocan K Pocan <br /> Concentration <br /> Spiked 200 u9/k9 200>19/k9 200 Y9/k9 <br /> LCS Batch# LCS031798 LCS031798 LCS031798 <br /> Date Prepared 03/17/98 03/17/98 03/17/98 <br /> Date Analyzed 03/17/98 03/17/98 03/17/98 <br /> Instrument I.D # GC5 GC5 GCs <br /> LCS % <br /> Recovery 111 108 101 <br /> Control Limits 65-135% 70-130% 70-130% <br /> MS/MSD <br /> Batch# BS031798 BS031798 BS031798 <br /> Date Prepared 03/17/98 03/17/98 03/17/98 <br /> Date Analyzed 03/17/98 03/17/98 03/17/98 <br /> Instrument I D # GC5 GCs GCs <br /> Matrix Spike <br /> Recovery 111 108 101 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 109 102 99 <br /> Relative% <br /> Difference 18 57 20 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICPL 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 /> and are not used to accept or reject batch results <br /> nda C Schn 1 er G Com/ <br /> rolect Manager/Sacramento Laboratory <br /> 8030077A PES <4> <br /> FSr'1 _ <br />