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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX (650)364-9233 <br /> 404 lei Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(516)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton / 980129-S1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9801 H79-05-06 Reported Feb 13, 1998 <br /> QUALITY-CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS0205981VITBEF3B <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD # 9801D2514 <br /> Sample Cone 64 <br /> Prepared Date - <br /> Analyzed Date 2/6/98 <br /> Instrument I D # F3 <br /> Cone Spiked 50 Mg/L <br /> Result 113 <br /> MS % Recovery 98 <br /> Dup Result 111 <br /> MSD % Recov 94 <br /> RPD 18 <br /> RPD Limit 0-25 <br /> LCS # LCS020598 <br /> Prepared Date - <br /> Analyzed Date 2/8/98 <br /> Instrument I D # F3 <br /> Conc Spiked 50)ug/L <br /> LCS Result 47 <br /> LCS % Recov 94 <br /> s0-140 <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 /> tPegr A YTICAL 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 /> ger **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 98011-179 BLA <10a <br />