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Sequoia 1:1) <br /> 660 Chesapeake Drive Redwood City, CA 94063 (650) 364-9600 FAX (650)364.9233 <br /> 404 N ViWiget lane Walnut Creek, CA 94598 (510) 988-9600 FAX(510) 988.9673 <br /> q1W Analytical 819 Striker Avenue,Suite a Sacramento,CA 95834 (9t6) 921.9600 FAX(916)921.0100 <br /> Blaine Tech Services, Inc." Client Project 1D Chevron 9-0557 971124-S2 <br /> 1680 Rogers Ave. Matrix: Liquid <br /> San Jose, CA 95112 <br /> Attention: Fran Thie Work Order#: 9711G09-01-09 Reported: Dec 22, 1997 <br /> .... . <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch#: MS120697MTBEH6A <br /> Analy. Method: EPA 6260 <br /> Prep. Method: N.A. <br /> Analyst: M.Williams <br /> MS/MSD #: 9711G0901 <br /> Sample Conc.: N.D. <br /> Prepared Date: 12/6/97 <br /> Analyzed Date: 12/6/97 <br /> Instrument I.D.#: H5 <br /> Cone. Spiked: 50pg/L <br /> Result: 54 <br /> MS % Recovery: 108 <br /> Dup. Result: 56 <br /> MSD % Recov.: 112 <br /> RPD: 3.6 <br /> RPD Limit: 0-25 <br /> LCS #: LCS120697 <br /> Prepared Date: 12/6/97 <br /> Analyzed Date: 12/6/97 <br /> Instrument I.D.#: H6 <br /> Cone. Spiked: 50ug/L <br /> LCS Result: 50 <br /> LCS % Recov.: 100 <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 /> S O1 NALYTICAL 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 /> Pe Penner <br /> r ect Manager **MS=Matrix Spike,MSD MS Duplicate,RPD=Relative%Difference 9711G09.BLA <6> <br />