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► 680 Chesapeake Dnve Redwood City CA 94063 {650} 364 9600 FAX(650) 364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> frI11� Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-8264 / 971124-Sl <br /> 1686 Rogers Ave Matrix Liquid <br /> San dose, CA 95112 <br /> Attention Fran Thie Work Order# 9711 F41-01 Reported Dec 1fi, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> OC Batch# MS120497MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst M Williams <br /> MS/MSD # 9711F9405 <br /> Sample Conc 58 <br /> Prepared Date 12/4/97 <br /> Analyzed Date 12/4/97 <br /> Instrument I D # F3 <br /> Conc Spiked 50}rg/L <br /> Result 55 <br /> MS % Recovery 98 <br /> Dup Result 58 <br /> MSD % Recov 104 <br /> RPD 53 <br /> RPD Limit 0-25 <br /> LCS # LCS120497 <br /> Prepared Date 12/4/97 <br /> Analyzed Date, 12/4/97 <br /> Instrument I D # F3 <br /> Conc Spiked 50N13/L <br /> LCS Result 51 <br /> LCS % Recov 102 <br /> 50-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagents, <br /> . SEQUOIA ANALYTICAL 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 /> a interference,the LCS recovery is to be used to validate the batch <br /> Peggy Penner <br /> Project Manage "*MS=Matrix Spike,MSD=MIS Duplicate,RPD=Relative%Difference 9711F41 BLA <10> <br />