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Sequoia680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N. Wiget lane Walnut Creek,CA 94599 (510) gas.9600 FAX(SIO)988.9673 <br /> Analytical 819 Striker Avenue,Suite a Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> Terra Vac Corp. Client Project ID': Che'vron #9-4054 <br /> 1651 Alvarado Street Matrix: Liquid <br /> San Leandro, CA 94577 <br /> Attention: Cliff Garratt OC Sample Group: 7100031-038 Reported: Oct 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch#: MS100897 <br /> MTSEF2A <br /> Analy. Method: EPA 8240 <br /> Prep. Method: - <br /> Analyst: M.Williams <br /> MS/MSD #: 9709106-02 <br /> Sample Conc.: N.D. <br /> Prepared Date: 10/8/97 <br /> Analyzed Date: 10/8/97 <br /> Instrument I.D.#: F-2 <br /> Conc. Spiked: 50 jig/L <br /> Result: 63 <br /> MS % Recovery: 126 <br /> Dup. Result: 63 <br /> MSD % Recov.: 126 <br /> RPD: <br /> 0.0 <br /> RPD Limit: 0-25 <br /> ............ <br /> ............ <br /> LCS #: LCS100897 <br /> Prepared Date: 10/8/97 <br /> Analyzed Date, 10/8/97 <br /> Instrument 1.1014: F-2 <br /> Conc. Spiked: 50 pg/L <br /> LCS Result: 60 <br /> LCS % Recov.: 120 <br /> MS/MSD <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 /> SEQUOIA ANALYTICAL, #1210 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 /> 0 <br /> he 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 /> Melissa A. Brewer M-5=Matrix Spike, MSD=MS Duplicate,RFD=Relative%Difference <br /> Client Services Representative <br /> 7100031.TVC <14> <br />