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680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX (51o) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (9 16) 921 0100 <br /> NO <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-1848/971120-G3 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order # 9711G04-01-02 Reported Dec 16, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS120197MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD # 9711 F371 0 <br /> Sample Conc 28 <br /> Prepared Date 12/1/97 <br /> Analyzed Date 12/1/97 <br /> Instrument I D # F3 <br /> Conc Spiked 50lig/L <br /> Result 52 <br /> MS % Recovery 98 <br /> • Dup Result 54 <br /> MSD % Recov 102 <br /> RPD 38 <br /> RPD Limit 0-25 <br /> LCS # LCS120297 <br /> Prepared Date 12/2/97 <br /> Analyzed Date 12/2/97 <br /> Instrument I D # F3 <br /> Conc Spiked 50Ng/L <br /> LCS Result 47 <br /> LCS %Recov 94 <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 /> 7SEQL 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 /> Peggy Penner <br /> Project Manager ""MS=Matrix Spike,MSD-MS Duplicate,RPD=Relative%Difference 9711G04 BLA <2> <br />