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r Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (6501 364-9600 FAX{650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(92 5)988-9673 <br /> Analytical 819 Striker Avenue.Suite 8 Sacramento,CA 95834 (916)921-9600 FAX f 916)921-0100 <br /> k455 McDowell Blvd, North,Ste. D Petaluma,CA 94954 (707) 792-1865 FAX f707) 792-0342 <br /> Blaine Tech Services, Inc. Client Project ID: Chevron 9-0557/ 980609-J2 <br /> 1680 Rogers Ave. Matrix- Liquid <br /> San Jose, CA 95112 <br /> Attention: Fran Thie Work Order #: 9806642 -01-09 Reported: Jun 29, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch#: MS0620988260S2A <br /> Analy. Method: EPA 8260 <br /> Prep. Method: EPA 5030 <br /> Analyst: L. Diaz <br /> MS/MSD#: 8061237 <br /> Sample Conc.: N.D. <br /> Prepared Date: 6/20/98 <br /> Analyzed Date: 6/20/98 <br /> Instrument I.D.#: GCMS2 <br /> Conc. Spiked: 50pg/L <br /> Result: 43 <br /> MS % Recovery: 86 <br />. Dup. Result: 44 <br /> MSD % Recov.: 88 <br /> RPD: 2.3 <br /> RPD Limit: 0-25 <br /> LCS #: LCS062096 <br /> Prepared Date: 6/20/96 <br /> Analyzed Date: 6/20/98 <br /> Instrument I.D.#: GCMS2 <br /> Conc. Spiked: 50 ug/L <br /> LCS Result: 44 <br /> LCS % Recov.: 88 <br /> 60-140 <br /> LCS 65-135 <br /> Control Limits <br /> Please Note: <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> %Elap <br /> #127 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 /> goryinterference,the LCS recovery is to be used to validate the batch. <br /> Manager **MS=Matrix Spike,MSI]=MS Duplicate, RPD=Relative% Difference 9806642,8LA <11> <br />