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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 a (925)988-9600 FAX(925)988-9673 a- )� Analytiea� 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(9t6)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 40 <br /> Blaine Tech Services, Inc Client Project ID Shell 6131 Pacific Ave <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9807H83 -01 Reported Aug 24, 1998 <br /> QUALITY CONTROL-DATA-REPORT <br /> Analyte MTBE <br /> --- — --—- - — - ------ ------ --- <br /> - QC Batch# MS073198MTBEH6A - ---- — — --- ---- -------— -- ---- --- ---- —-- -- <br /> Anally Method EPA 8260 <br /> Prep Method NA <br /> Analyst L Zhu <br /> MS/MSD # 9807H7004 <br /> Sample Conc ND <br /> Prepared Date 7/31/98 <br /> Analyzed Date 7/31/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50Ng/L <br /> Result 52 <br /> MS % Recovery 104 <br /> Dup Result 53 . <br /> MSD % Recov 106 <br /> RPD 19 <br /> —RPD-Limit 0-25 <br /> -- _ LCS # BLK073198 -- <br /> Prepared Date 7/31/98 <br /> Analyzed Date 7/31/98 <br /> Instrument I D #• H6 <br /> Conc Spiked 50ug/L <br /> LCS Result 51 <br /> LCS % Recov 102 <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 /> ALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sampl <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> Interference,the LCS recovery Is to be used to validate the batch <br /> TPerionner <br /> Manager **MS=Matrix Spike, MSD=MS Duplicate, RPO=Relative% Difference 98071-183 BLA <1 a <br />