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Sequoia 680 Chesapeake Drive 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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> i <br /> Pacific Environmental Group Client Project 1D 920-119 1A / Chevron 9-6171, Stockton, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sod <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson OC Sample Group 8010596-608 Reported Jan 26, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> MTBE <br /> Method EPA 8260 <br /> Analyst M Williams <br /> Concentration <br /> Spiked 2500,ug/kg <br /> LCS Batch# VMB0121 S <br /> Date Prepared 01/21/98 <br /> Date Analyzed 01/21/98 <br /> Instrument I D # F3 <br /> LCS % <br />. Recovery 100 <br /> Control Limits 70 130 <br /> MS/MSD <br /> Batch # 980141507 <br /> Date Prepared 01/21/98 <br /> Date Analyzed 01/21/98 <br /> Instrument LD # F3 <br /> Matrix Spike <br /> % Recovery 96 <br /> Matrix Spike <br /> Duplicate% 92 <br /> Recovery <br /> Relative % <br /> Difference 43 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br />�SEOUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> Z / 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 /> r Z 'hI�G�C <br /> Linda C Schneider <br /> Project Manager/Sacramento Laboratory <br /> $010596 PETS <14> <br /> t� <br />