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". w, Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 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 /> Blaine Tech Services, Inc Client ProjectIDShell Stockton f 970829-S1 <br /> v 1680 Rogers Ave Matrix Liquid 4. <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9708F00-01-02 Reported Sep 3, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS082897MTBEH6A <br /> Analy Method: EPA 8260 <br /> Prep. Method N A <br /> Analyst. L Zhu <br /> MS/MSD #: 9708D8901 <br /> Sample Conc: 110 <br /> Prepared Date 8/28/97 <br /> Analyzed Date 8/28/97 <br /> Instrument I D #. H6 <br /> Conc Spiked: 50Erg/L <br /> Result' 160 <br /> MS % Recovery 100 <br /> Dup Result: 170 <br /> MSD %Recov.: 120 <br /> RPD 61 <br /> RPD Limit. 0-25 <br /> LCS # VMB082997 <br /> Prepared Date. 8/29/97 <br /> Analyzed Date: 8/29/97 <br /> Instrument I D #: H6 <br /> Conc Spiked' 50Ng/L <br /> LCS Result 46 <br /> LCS % Recov . 92 <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 /> U IA 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 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 /> g Penner <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9708F00 BLA <2> <br />