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` Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364.9600 FAX(650)364.9233 <br /> 404 N. Wiget Lane Walnut Creek, CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suitt 8 Sacramento, CA 95834 (916) 921-9600 FAX (916)921.0100 <br /> ;81aine Tech Services, Inc. Client Project ID: Chevron 9-0557/980,211-61 <br /> 1680 Rogers Ave. Matrix-. Liquid <br /> San.lose, CA 95112 <br /> Attention Fran Thle Work Order #: 9802714-05-08 deported: Mar 5, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#: GCO22398802007A GCO22398802007A GCO22398802007A GCO22398802007A GCO22398802007A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: S.L. S.L. S.L. S.L. S.L. <br /> MS/MSD #: 98020508 98020508 98020508 98020508 <br /> Sample Cone.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 2/23/98 2/23/98 2/23/98 2/23/98 <br /> Analyzed Date: 2/23/98 2/23/98 2/23/98 2/23/98 <br /> Instrument I.D.#: GC7 GC7 GC7 GC7 <br /> Cone. Spiked: 20 ug/L 20 ug/L 20 ug/L 60 ug/L <br /> Result: 19.6 19.1 187 59.7 <br /> MS % Recovery: 98 96 94 100 <br /> Dup. Result: 19 18.9 18.9 59.5 <br /> MSD % Recov.: 95 95 95 99 <br /> RPD: 3.1 1.1 1.1 0.34 <br /> RPD Limit: 0-25 0-25 0-25 0-25 <br /> LCS #: LCS022398 LCS022398 LCS022398 LCS022398 LCS022398 <br /> Prepared Date: 2/23/98 2/23/98 2/23/98 2/23/98 2/23/98 <br /> Analyzed Date: 2/23/98 2/23/98 2/23/98 2/23/98 2/23/98 <br /> Instrument I.D.#: GC7 GC7 GC7 GC7 GC7 <br /> Cone. Spiked: 20 ug/L 20 ug/L 20 ug/L 60 ug/L 500 ug/L <br /> LCS Result: 21.4 21.5 21.9 69.1 474 <br /> LCS % Recov.: 107 108 110 115 95 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <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 AAMap #21 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 /> Penner interference,the LCS recovery is to be used to validate the batch. <br /> 6/Project Manager MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9802714.BLA <2> <br />