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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 9604 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek, CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategles V Client Project ID Chevron 9-6171, Stockton v <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> 'Attention Deanna Harding Work Order# 9803027-06 Reported Mar 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS030498MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst E Manuel <br /> MS/MSD # 9802J3602 <br /> Sample Conc 6 0 <br /> Prepared Date 3/4/98 <br /> Analyzed Date 3/4/98 <br /> Instrument I D # F3 <br /> Conc Spiked 50yg/L <br /> Result 55 <br /> MS % Recovery 98 <br /> SDup Result 51 <br /> MSD % Recov 90 <br /> RPD 75 <br /> RPD Limit 0-25 <br /> LCS # LCS030498 <br /> Prepared Date 3/4/98 <br /> Analyzed Date 3/4/98 <br /> Instrument I D # F3 <br /> Conc Spiked 50ug/L <br /> LCS Result 44 <br /> LCS % Recon 88 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> 0SEQU A ICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recovery Is to be used to validate the batch <br /> regory <br /> roject Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9803027 GET 44> <br /> d� <br />