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4 Sequoia 680 Chesapeake Drive 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 /> fi�ll>� Analytical 819 Striker 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 Mose, CA 95112 <br /> Attention Fran Thie Work Order# 98011-181-08 Reported Feb 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS020998MTBEH6A <br /> Anally Method BPA 8260 <br /> Prep Method NA <br /> Analyst L Zhu <br /> MS/MSD # 980210203 <br /> Sample Conc 31 <br /> Prepared Date 2/9/98 <br /> Analyzed Date 2/9/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50{ug/L <br /> Result 58 <br /> MS % Recovery 110 <br /> 10 Dup Result 56 <br /> MSD % Recov 106 <br /> RPD 35 <br /> RPD Limit 0-25 <br /> LCS # LCS021098 <br /> Prepared Date 2/10/98 <br /> Analyzed Date 2/10/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 jig/L <br /> LCS Result 52 <br /> LCS % Recov 104 <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 /> 6oct <br /> O A ALYTICAL 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 analylccal 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 /> Penner <br /> P Manager **MS=Matrix Spike,MSD=MS Duplicate, RPO=Relative% Difference 9801H79 BLA <13> <br />