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n <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 9406-4 (415) 364.9600 FAX(415)364-9213 <br /> 404 N.Wigct Lane Walnut Creek,CA 94598 (510) 988-9600 FAX (5 10)9so-%73 <br /> 3 19 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-W" FAX (916)921,0100 <br /> Analytical <br /> T4iia"Vac Corp. Client Project ID. Chevron #9-4054 <br /> 1651 Alvarado Street Matrix: Solid <br /> San Leandro, CA 94577 <br /> Attention: Cliff Garratt OC Sample Group: 7101369-370 Reported: Oct 22, 1997L: <br /> ............ <br /> -:2 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> OC Batch#: SP102197 <br /> MTBES2A <br /> Analy. Method: EPA 8260 <br /> Prep. Method: . EPA 5030 <br /> Analyst: <br /> MS/MSD #: <br /> Sample Cone., <br /> Prepared Date: <br /> Analyzed Date: <br /> Instrument I.D.#: <br /> Cone. Spiked: <br /> Result: <br /> MS %Recovery: <br /> Dup. Result: <br /> MSD % Recov.: <br /> RPD: <br /> RPD Limit: <br /> . . ......... <br /> ........... <br /> LCS #: LCS102197 <br /> Prepared Date: 10/21/97 <br /> Analyzed Date: 10/21/97 <br /> Instrument I.D.#: GC/MS-2 <br /> Cone. Spiked: 2500pg/kg <br /> LCS Result: 2600 <br /> LCS % Recov.: 102 <br /> MS­7MSD <br /> LCS 65-135 <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, #1271 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 /> ^Lrecovery 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 MS-Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Client Services Representative <br /> 7101369,TVC <3> <br />