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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(5 10)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br />' Pacific Environmental Group Client Project ID 920-122 1A/Chevron 9-9840 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sol[ <br /> Rancho Cordova, CA 95742 <br />' Attention Tim Anenson QC Sample Group 803-0235 Reported Mar 26, 1998 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE <br /> MTBE <br /> Method EPA 8260 <br /> Analyst K Pocan <br /> Concentration <br /> Spiked 2,500 pg/kg <br /> tLCS Batch# LCS031698 <br />' Date Prepared 03/16/98 <br /> Date Analyzed 03/16/98 <br /> Instrument I D # MS-F1 <br /> LCS <br /> Recovery 101 <br />' Control Limits 70-1311% <br />' MS/MSD <br /> Batch # 8030146 <br />' Date Prepared 113/13/98 <br /> Date Analyzed 03/13/98 <br /> Instrument I D # MS-F1 <br />' Matrix Spike <br /> % Recovery 126 <br /> I Matrix Spike <br /> Duplicate % <br /> Recovery 106 <br /> I Relative % <br /> Difference 17 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed yzed using the same reagents <br /> SEQU IA 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 MS/MSDs are advisory only <br /> �/y � and are not used to accept or reject batch results <br /> inda C Sch eider <br /> Project Manager/Sacramento Laboratory <br /> 8030235 PES <2> <br />