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Sequoia (—) 68'0 Chesapeake Drive Redwood City,CA 94`0) (6501 364-9600 FAX(650)364-9233 <br /> 404 N. Wiget Lane Walnut Creek,CA 94590 (510) 988-9'600 FAX(510)998-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95934 (916) 921-9600 FAX(916)921-0100 <br /> "81aiine Tech Services, Inc. Client Project ID: Chevron 94054/980210'' <br /> ;:7:1680 Rogers Ave. Matrix: Liquid <br /> :..-.San Jose, CA 95112 <br /> :Attention: Fran Thie Work Order# 9802716-04, 06-13 Reported: Mar 5, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC E3atch#: GCO22398802004A GCO22398802004A GCO22398802004A GCO22398802004A GCO22398802004A <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 #: 98020546 98020546 98020546 98020546 <br /> Sample Conc.: 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.#: GC4 GC4 GC4 GC4 <br /> Conc. Spiked: 20,ug/L 20,ug/L 20 pg/L 60jug/L <br /> Result: 19.8 20.7 21.5 64.7 <br /> IVIS % Recovery: 99 104 108 108 <br /> Dup. Result: 19.8 20.8 21.8 65.6 <br /> MSD % Recov.: 99 104 109 109 <br /> RPD: 0.0 0.48 1.4 1.4 <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.#: GC4 GC4 GC4 GC4 GC4 <br /> Conc. Spiked: 20 lig/L 20 jug/L 20,ug/L 60 Mg/L 500,ug/L <br /> LCS Result: 18.6 19.4 20.5 62 450 <br /> LCS % Recov.: 93 97 103 103 90 <br /> MS/M913 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 reagents. <br /> Elap #214 preparation.and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br /> Fla fortified with known quantities of specific compounds and subjected to the entire analytical procedure. It <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 /> enner <br /> roject Manager MS=Matrix Spike,MSD=MS Duplicate,RPO=Relative%Difference 9802716.81-A <3> <br />