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Sequoia680 Chesapeake Dave Redwood GM CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wigct 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 /> Gettler Ryan/Geostrategies Client Project ID Chevron 9-61171, Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> -Dublin, CA 94568 <br /> Attention Deanna Harding Work Order # 9803027-02-05, 07 Reported Mar 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS030298MTBEF3A <br /> Ana[y Method EPA 8260 <br /> Prep Method N A <br /> Analyst E Manuel <br /> MS/MSD # 9802F9711 <br /> Sample Conc N D <br /> Prepared Date 3/2/98 <br /> Analyzed Date 3/2/98 <br /> Instrument i D # F3 <br /> Conc Spiked 50ug/L <br /> Result 52 <br /> S % Recovery 104 <br /> Dup Result 51 <br /> MSD % Recov 102 <br /> RPD 19 <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 50pg/L <br /> LCS Result 45 <br /> LCS % Recov 90 <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 /> jEeQ ��NALYTICAL 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 ifthe 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 /> ory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Dtffei -ice 9803027 GET <3> <br /> 0 . <br />